The Sirens are a mysterious race of beings that have manipulated things to set up this reenactment of World War II. They generally take a hands-off approach, preferring to let the factions fight each other. However, they do show up themselves during game events.

Later events and Crosswave reveal that the name of the Sirens is Antiochus ^note

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General

Tropes that apply to the Sirens in general

Alternate Timeline: The Sirens abuse this trope to perform their Reenactments. They leave humanity mostly to their own devices in the main game's storyline, but they do things differently in the events, in order to map out and see the various possibilities and consequences of their actions.
Ambiguously Evil: The Fallen Wings event implies the motivation and purpose of the Sirens might be much more complex than they seem at first. It is clear that the Sirens seek evolution and growth above all else, but as for why, there are multiple possibilities shown:
- The conversation between the Inquisitor/Magister and the Siren Observer Zero implies the existence of a third party whom humanity cannot defeat, even with the power of the Sirens. This would push the Sirens to Well-Intentioned Extremist territory since they are manipulating humanity for the sake of evolution against a greater threat.
Animal Motifs: All the Sirens are designed around marine life, such as various types of cephalopods, stingrays, and hammerhead sharks.
Armor-Piercing Attack: Most Siren attacks are blue armor-piercing shells, which can do massive damage to your heavier ships. However, there are some normal shells in their mix, and Oceana's most devastating attack is her close-range purple HE barrage.
Big Bad: The Sirens are the source of the Mental Cubes which give birth to the Kansens/ship girls. The only reason humanity is even divided into factions in the first place is that the Sirens indirectly spread the Mental Cubes to various factions. While the Sakura Empire and the Ironblood are the main antagonists faced throughout the main story, it's often implied and later outright said in the Visitors Dyed in Red event that they believe the Sirens to be gods and that serving them will pave the best future for humanity. Meanwhile, the Sirens themselves are created by and operate according to the wishes of the Creator: a mysterious entity who all Sirens serve. This would make the Creator a Greater-Scope Villain to the Sirens, themselves Greater Scope Villains to the Sakura Empire and Ironblood factions. Subsequent events subvert this with the reveal of who the Creator really is.
Bizarre Alien Biology: In Crosswave, it’s indicated that Sirens feel ‘cold,’ as if they do not generate natural body heat.
Bling of War: In Daedalian Hymn, the Sirens in the Labyrinth are decked out in gold and red. The Sardegnian fleet notes that unlike many other recolored Sirens, they don't actually fight any different and the Sardegnians derride the golden sirens as pale immitations of the splendor of Sardegnia's artistic traditions, but also come to suspect that their incredibly eye-catching coloration is meant to lure the Sardegnians into a trap.
Blue-and-Orange Morality: Subtle, but becomes noticeable when their motivations are analyzed. They are willing to wage war, eradicate an entire species, decimate entire timlines, all for the sake of evolution. When the world and humanity are too deteriorated to suffice as their opponents, they simply go to the past and subtly help them advance and evolve (by giving a bit of their own technology) for them to become their opponents. Their sheer dedication and effort for evolution and growth are nothing short of monstrous.
- Taken even further when it is shown that their obsession with evolution is intimately linked with their desire to please and become closer to their Creator, who is very whimsical in their choices and preferences. Even Observer Alpha has complained that the Creator has a "sick sense of humor".
Body Backup Drive: The Elite Sirens' minds are stored on special servers hidden in personal Mirror Seas that can also produce a seemingly endless supply of back-up bodies. As long as those servers are intact, even if they're destroyed in combat, they'll simply upload themselves to a new body and come back for more.
Chess Motifs: Their mook ships are named after chess pieces, with Destroyers being called Pawns. And in the Opposite Colored Mirror/Divergent Chessboard event, it's revealed they refer to both their own ship girls and Azur Lane's in such terms.
Cryptic Conversation: With some exceptions, good luck trying to get answers out of them. Most of the Sirens seem to brush off the ship girls' questions regarding their actions and keep talking like the latter never said anything. It's the source of some immense frustration both in-game and out to the point that during the Ashen Simulacrum event Enterprise finally snaps and screams "ANSWER ME!!!" when she can't get a straight answer.
Dark Is Evil: The Siren mook ships and their ship girls tend to wear black and are armed with black pieces of equipment.
Eldritch Location: The Mirror Seas, distortions of the time flow which manifest only upon certain regions of space on the ocean. Within the Mirror Seas, events akin to Alternate Timelines come to existence, anchored into reality through observation of powerful entities.
- On that note, the Sanctuary, first introduced in Visitors Dyed in Red, is a place where the Sirens harvest the souls of Kansens to create copies of them. Their control over reality within the Sanctuary is immense, allowing them to go as far as to simply pause and reset reality as they please.
The End of the World as We Know It: The Sirens come from a future where the world was destroyed by an unknown enemy. They themselves have destroyed multiple timelines in an attempt so humanity and the shipgirls can grow strong enough to combat the threat
Human All Along: The Fallen Wings event hints that the Creator whom all the Sirens serve might be actually human, or originally human. Taking the Operation Siren Record Files and the goal of the Ashes into account, the ending quote of Fallen Wings is implied to have come from the Creator, who is also Code G's creator, Dr. Anzeel.
"Mankind, actually lives a humble existence. But our small bodies are filled with infinite expectations and ideals. We often put our own expectations and ideals and shape them to our desires, hoping they are eternal and powerful. Once strong enough, they will replace our ephemeral physical existence and become an infinite spiritual sustenance. This is also the meaning to your (Enterprise's) name. But… one day, if mankind abandons our highest ideals, and embarks on a completely contrary path… are you willing… to help us correct the wrongdoings of the future?"
Humanity Is Infectious: Invoked as the reason for their Character Development in Pledge of the Radiant Court. When asked point-blank why Purifier had become a meme- and pop-culture reference-spewing borderline Friendly Enemy to the Kansen when before the Sirens were basically a species of robotic Emotionless Girls, Purifier answers that it was actually Observer’s idea, and that she had been downloading ‘human culture’ (in the form of books, movies, comics, anime, and manga) and uploading it directly into the Siren mainframes in order to better understand humanity. This trope was the inevitable result and almost certainly the reason why Observer and Purifier in particular Grew Beyond Their Programming.
Icy Blue Eyes: The second stage series Sirens have blue eyes rather than gold.
I Need You Stronger: Their goal is revealed to be forcing humanity and the KAN-SEN to evolve through war and strife and achieve "Flawlessness", possibly to defeat an even stronger enemy.
It Amused Me: All the Sirens shown so far have displayed various levels of glee and amusement in their machinations and their manipulation of humanity, with a few exceptions.
Meaningful Name:
- Sirens are known to sing songs which tempt shipmen and lead various ships into crashing onto rocks and sink. Exactly like how the Sirens tempted the Sakura Empire and Ironblood to defect from Azur Lane and halt the voyage of humanity into crashing onto a rock of mutual conflict. Alternately, later events show that their name might not refer to the mythical creature, but as a warning device.
- In JP, "Antiochus" is Anti-X, with the unknown enemy simply called 'X'.
  - In NA, it's actually also Anti-X, with Antiochus being a nickname given by Dr. Anzeel, and used in the main timeline, by coincidence or otherwise.
Mystical White Hair: The humanoid Sirens tend to have white hair with a slight hue of dark purple.
Not So Omniscient After All: The event Visitors Dyed In Red has Observer Alpha find that, despite what they may have thought, they are not in control of everything. This is brought on by Shoukaku managing to break free of brainwashing to protect her sister. There's also the fact that they have no real control over G, to the point that, in the event Winter's Crown, Purifier only gets her to not blow up most of the Northern Union by luring the Royal Navy forces towards her.
Only Known by Their Nickname: Or in this case, codenames. All of the important Siren figures so far are named after their classes (Observer Alpha, Tester Beta, Purifier). Only Observer Zero and Key Point G seem to have actual names, Lyn and Enterprise, respectively.
Orcus on His Throne: Somewhat downplayed. In the main game they're content to observe the ongoing events, but in various events such as Winter's Crown and Ink-Stained Sakura they're willing to get their hands dirty.
Purple Is Powerful: The Northern Overture event introduces new, more powerful variants of existing Sirens (both humanoid and production) with new capabilities, and these versions replace the blue or red highlights found on regular Sirens with purple ones that crackle with lightning (purple for humanoid Sirens and blue for the production models), and similarly replace their blue shells with purple ones.
Sickly Green Glow: The variant Sirens encountered in Tower of Transcendence, seemingly under the command of Arbiter VI "The Lovers" have new firing patterns and are black with green Tron Lines and fire black shells with green outlines. Additionally, their humanoid units (other than the Enforcers and the Arbiter herself) are surrounded by a green cloud.
Supernatural Gold Eyes: Most of the humanoid Sirens generally have these.
Time Travel: The Sirens are heavily hinted to come from the future, and their mook ships (seen in events only) look the part.
Tron Lines: Mook ships have glowing orange-red patterns or lines that strobe on and off. Various events may introduce other colors, indicating some variation from the Siren norm.

Generic Sirens

Explorer

Stripperiffic: She wears a very skimpy black bikini with an open coat.

Chaser/Tracker

Arm Cannon: She has a weapon arm, on which arm depends on the direction she is facing.
Girlish Pigtails: She has thick waist-length twin-tails.
More Dakka: Her signature attack is a several-seconds-long stream of rapid-fire AP rounds, along with two streams of AP shells that serve to try to limit your field of movement (which Oceana also has).
Slasher Smile: Her default expression.

Scavenger/Oceana

Boss in Mook's Clothing: Her heavy armor and huge HE shell barrages make her much more dangerous to the vanguard fleet than the other generic Sirens, yet she isn't treated any differently from the other roaming Sirens and she's one of the most recurring ones after Explorer and Tracker.
Orcus on His Throne: She sits on a rigging which houses her weapons.
The Computer Is a Cheating Bastard: She has heavy armor despite being a heavy cruiser. This was nerfed in later versions thankfully.

Breaker/Peacebreaker

Eyepatch of Power: Hers looking like a cyborg implant.
Leotard of Power: White leotard with some black belt-like rigging.
Multi-Armed and Dangerous: She has Doc Ock-style mechanical arms on her back with weapons on them.
Names to Run Away from Really Fast: Her name is by far the most intimidating of the generic Sirens, and as a battleship she packs a serious punch.

Conductor/Strategist

Badass Longcoat: Wears a longcoat with the inside glowing yellow or blue.
Evil Diva: Or more appropriately evil DJ.
Headphones Equal Isolation: Probably to give her a DJ appearance.

Lurker

Aquatic Mook: Currently the only submarine Siren.
Goggles Do Nothing: She never puts her goggles on, not even while underwater, and just leaves them on her forehead.
Tomboyish Ponytail: Has a very thick ponytail that is bigger than her head.

Intruder

Arm Cannon: One mounting a pair of Tesla Coils.
Expy: Of Stingray.
Lightning Gun: She has a pair of Tesla Coils which she uses at close range.

Elite Sirens

These are the first Siren encountered in the story that seem able to be self-conscious and can interact with the Shipgirls. Although they prefer to act from the shadow and avoid confrontation, they can also show up as bosses during some events. Their primary objective seems to be running tests and observing the results from them. They also create mirror seas. As we have encountered other Siren groups, that are clearly defined, it's unknown if these Siren form a single group and share a single goal. They are often referred to the Sirens' elite by shipgirls.

While the canonicity of Looking Glass of Fact and Fiction is debatable, it is revealed during said events that all Siren Elites are connected with each other through a network. The mirror sea of this event seemingly interfered with this network, causing two of the Elites, Tester and Purifier, to lose their memory and adopt different personalities and once they they reconnect with the network, their original personality resurfaces, although Purifier seemed to struggle between both of her personalities, lamenting that she is just a machine body. It is also mentioned they can die and get new bodies.

The Observer

Observer α

Voiced by: Moe Toyota (Japanese), Natalie Van Sistine (English), Yotzmit Ramírez (Latin American Spanish)

https://static.tvtropes.org/pmwiki/pub/images/observer_alpha.png

The Observer of the Sanctuary

The main Siren figure seen throughout the story, as her name implies her purpose is to observe the growth of humanity (or to be specific, the growth of the ship girls belonging to humanity) within the 'Reencactments' and report the data to the "Creator".

As an observer, she interacts with the protagonists sparingly. Alpha spends most of her time working behind the scenes to collect data, sending them to both the Creator and Tester Beta so the parameters of the next Reenactment could be better adjusted.

Animal Motifs: Her equipment resembles a giant scallop, a type of sea molluscs resembling clams.
Alternate Self: An Observer from an alternate timeline is shown providing Code G and her allies a base, supplies, and the coordinates of the Arbiters when Enterprise is shown Code G's memories while trapped in Compiler's Signal-jamming mist.
The Chessmaster: Her ultimate goals are anyone's guess, but she'll play any side towards that end. In separate events, she has informed Takao META about the Sakura Empire conducting a ritual with the Watatsumi (Swirling Cherry Blossoms); and had Compiler investigate the Arbiters and withhold data from Observer Zero (Tower of Transcendence).
Combat Tentacles: Has a set of these coming from her mechanized seat.
Deadpan Snarker: Not so much deadpan but definitely snarky; being playful, sarcastic, and prone to giving praises which are difficult to distinguish from insults and false flatteries. This is especially notable in her conversations with Key Point G during the events of both Fallen Wings and Ashen Simulacrum.
Grew Beyond Their Programming: The end of the Tower of Transcendence event shows Observer Alpha monologuing to Compiler about what would happen if their timeline branch were to be destroyed (her CN dialogue mulls on whether she and Compiler would be synchronized to the host network after being wiped; her JP/EN dialogue mulls the concept of a soul and the Theseus' Ship Paradox), implying that she's been developing a sense of self (and in turn a sense of self-preservation).
Hypocrite: At the end of Tower of Transcendence she has questions about what would happen to her personality if her timeline is wiped, yet she apparently had no qualms in wiping, or attempting to wipe, Purifier's "Purity" persona at the end of Looking Glass of Fact and Fiction. If one takes into account Crosswave where Purifier betrayed her, this might be payback for that.
Immortals Fear Death: All it took was for her to realize that her backup data need only be deleted or otherwise lost for it to be possible for Elite Sirens like her to die. That thought visibly unnerves her.
Mathematician's Answer: At the end of the Tower of Transcendence event, she gives this answer to Compiler's question.
Compiler: When was the last time you received instructions from Zero?
Observer Alpha: The last time I received instructions from Zero, Compiler.
More Dakka: Her mechanized seat has four cannons on each side of its "wheels".
Ms. Exposition: Along with Tester Beta, she often ends up explaining the reasons and the results after each experiment the Sirens had just finished, particularly in the events.
Red Oni, Blue Oni: She is the blue to Tester Beta's red, being the more observant of the two. However, there are times when this is flipped around: during the Visitors Dyed in Red event Alpha is more exasperated and annoyed by the Creator's sudden decision while Beta remains calm and accepting.
Stripperiffic: Her clothing is basically a small swim dress probably intended for children, with an opening which leaves her stomach and a bit of her lower body bare. Her reveal in the anime particularly emphasizes her stomach and lower body.
Super Wheelchair: Though Observer Alpha is obviously not crippled, her equipment pretty much looks like two wheels with cannons and tentacles with a seat in-between them. She also seems to travel across the sea while remaining seated without her feet touching the water at all.
Those Two Girls: With Tester Beta, being the two most commonly seen important Siren figures and the ones in charge of observing and testing humanity.
- In Crosswave, she's instead seen with Purifier while Tester Beta is nowhere to be seen, but given the lesser Siren influence in that game's timeline Tester might not be needed.
The Tease: Openly flirtatious with the Commander during the 2023 Special Popularity Poll.
True Final Boss: Of Crosswave, along with Purifier, as the enemies you'll face for the final level of Extreme Battle Mode.

The Tester

Tester β

Voiced by: Chika Anzai (Japanese), Brittany Lauda (English), Sofía Huerta (Latin American Spanish)

https://static.tvtropes.org/pmwiki/pub/images/tester_beta_azur_lane__d2d877ff19c53c21542254ae8bd0d7e9.png

The Adversary of the Observation

The other main Siren figure seen throughout the story. In accordance to her class, her purpose is to test the 'parameters' of each Reenactment done by Observer Alpha, by pitting the protagonists against older, outdated Siren models and at times against herself.

Despite being a tester, she still interacts very little with the protagonists. Her main role is to determine if the parameters given by Observer Alpha are satisfactory.

Animal Motifs: Her backpack equipment resembles a manta ray.
Deadpan Snarker: Much like Observer Alpha, Tester Beta is rather snarky and is unlikely to spend a scene without a witty remark to someone or something.
More Dakka: She has a grand total of 12 visible cannons, there are three on top of each wing of her backpack and there are a pair of triple-barrel cannons extending under the wings.
Ms. Exposition: Shares this role with Observer Alpha.
Psychotic Smirk: Her default expression, which says a lot for her personality.
Punny Name: Her name is Beta, making her a Beta Tester. Fittingly, part of her job is testing humanity and the shipgirls' progress.
Red Oni, Blue Oni: Being the red to Observer Alpha's blue, being the more active and tenacious of the two. However, there are times when this is flipped around: during the Visitors Dyed in Red Alpha is more exasperated and annoyed by the Creator's sudden decision while Beta remains calm and accepting.
Those Two Girls: With Observer Alpha, the two are the most commonly seen important Siren figures in events.

The Purifier

Purifier

Voiced by: Marika Kouno (Japanese), Melissa Sternenberg (English), Jessica Ángeles (Latin American Spanish)

The Cleanser of the Impurities

Another important Siren figure which makes her debut in Winter's Crown. As with the previous Siren figures, her class defines her purpose: to 'purify' or remove unwanted elements within the Reenactments conducted by the Sirens. She very much enjoys using force to accomplish so, but like all Sirens, she is adaptable in fulfilling her purpose.

In the event, Observer Alpha orders Purifier to try and prevent Key Point G from creating a singularity around North Europian Union territory. She is overjoyed about the prospect of battling 'the legend' in person, but she is fully aware she is unlikely to finish the mission on her own. Thus, Purifier instead allows the Royal Navy ships to follow her while she goes to find the Key's location. When she finds G near the end of the event, the Purifier asks the Key's motives for building a singularity capable of nuking half of North Union (read: Russia) to oblivion if ddone wrong and warns her to stop. The Key doesn't listen, but when Victorious of the Royal Navy arrives, G halts and asks Purifier if she brought the ship girl there, which Purifier affirms. Grudgingly, the Key dispels the singularity and warns Purifier about "involving outsiders", promising her wrath if the Sirens try it again, before leaving.

Her mission accomplished, Purifier then decides to reward the Royal Navy ships by engaging them in battle, becoming the Final Boss of the event. However, despite being sunk in the ensuing clash, Purifier returns unharmed in the epilogue, conversing with Observer Alpha about the potential of Mental Cubes and the experience she gains from her defeat. Purifier gleefully asks Alpha for more, to which the Observer replies by asking if Purifier doesn't mind 'cherry blossoms' for her next mission.

Amnesia Episode: In the Hololive collab event, the strange formation of Mirror Sea in the event causes her to become disconnected from the Siren network and gives her amnesia. She ends up living with the Hololive girls under the name Purity and provided them with riggings to fight against other Sirens. It didn't last: after Aqua blows up their headquarters in order to destroy the Mirror Sea, Purifier's connection to the network is restored. With that, Observer retrieves her and restores her pre-amnesia personality… until Purity returns in the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event.
Ambiguous Situation: The ending of the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event ultimately leaves more questions than answers as to the ultimate fate of Purity as an independent entity, despite the rather large role she played during the event’s storyline. Clearly, Observer did not actually delete her, and kept her around to use for future experiments. Where the ambiguity comes in is whether or not Purity is just a data clone they kept strictly for use in such types of experiments or if Purity still exists at all as an independent entity of sorts, whether Observer actually switched Purifier back for the sake of this one experiment, or some combination of the above. When the event ends, she just vanishes along with the Mirror Sea, without so much as a goodbye. Pledge of the Radiant Court seems to imply remnants of her Purity persona are indeed part of Purifier now, but can be forced to follow orders by Observer if the need arises.
Amnesiacs are Innocent: While still a bit off-kilter, she is genuinely kind and helpful towards the Azur Lane ships during her time as Purity in the Hololive event. Several of the girls admit they'll miss her after the Mirror Sea vanishes, and even Zuikaku admits that, were all Sirens like that, they probably wouldn't have to fight. Purifier herself is shown to have similar thoughts about her role as Observer begins to repair her.
Animal Mecha: Her huge equipment resembles a hammerhead shark larger than her entire body, with a pair of cannons on each of its fins. Though it doesn't seem to be alive or independent, Purifier does ride on it in her chibi battle sprite.
Animal Motifs: Sharks, specifically a hammerhead shark. Her equipment is designed like one, and her attitude in battle can only be described as a cheerfully sadistic predator.
Attack Drones: Seems to have two smaller units accompanying her, each with a pair of cannons.
Attack of the 50-Foot Whatever: During the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event, Purity enlarges herself to a massive scale in order to fight a Kaiju. And she loves every second of it.
Awesomeness by Analysis: Purity still has access to the Siren databanks in the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event, which allows her to size up the Kaiju and even know exactly what it was thinking and whom it was going to target first.
Back from the Dead: Death doesn't even inconvenience Purifier all that much, as at the end of Winter's Crown she returns as soon as she was sunk. Judging from Observer Alpha's comments, it seems to be a case of Body Backup Drive, as she considers Purifier's sinking to be a 'loss of resources'.
- In Episode 12 of the anime, she gets caught in the explosion of one of Orochi's missiles, leaving her as just a head. She shows no signs of being in pain and winds up laughing it off.
Berserk Button: There is one thing that will absolutely drive her livid: refusing to go to war and insisting on peace. In Crosswave, the failure to drive the nations to war drives her mad as she proceeds to hijack the Siren operation. This becomes a source of Dramatic Irony during the Hololive event; she herself begins to regret having to fight the Kansen, right before her time as Purity is erased from her memories and her old personality is brought back.
Blood Knight: There doesn't seem to be anything Purifier enjoys more than fighting. She is excited at the prospect of battling Key Point G despite knowing she is outmatched, and doesn't even bat an eye when she returns Back from the Dead after being sunk by the protagonists, only happy that she has gained more experience through combat and thus can fight better.
Brick Joke: During the events of World Spanning Arclight, her Purity persona mentions she always wanted to be a teacher. During Pledge of the Radiant Court, upon encountering Vanguard and her team, decides to act as a teacher guiding the others as if she was a teacher guiding children on a field trip.
The Bus Came Back: She reappears as her Purity persona during the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event. She reappears yet again during the Atelier Ryza 2: Lost Legends & the Secret Fairy collab event.
Casual Danger Dialogue: Even in the face of overwhelming odds, Purifier keeps her cheerful attitude in stride.
Deadpan Snarker: Seems to be a recurring theme for the Sirens by this point. She is not deadpan at all, but she makes an effort to make fun of everything she could: for example, she nicknames Key Point G as "Ms. Little Sunshine" (in the English version).
Enemy Mine: During Pledge of the Radiant Court, Siren forces under Purifier deem Bon Homme Richard META a great enough threat that they work with the Royal Navy shipgirls to get them back out of "Camelot" before Bon Homme Richard can induce METAmorphosis in the Royal Navy shipgirls.
Evil Is Hammy: Parodied during the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event when she fights a Kaiju and starts sounding like a stereotypical 1990’s Mecha villain. At Akane and Roon’s prompting, she continues to unleash her inner hog, culminating in a Hurricane of Puns and even a Yu-Gi-Oh! reference.
Final Boss: Of the Winter's Crown event.
Gadgeteer Genius: As Purity. She can build a fully-functional rigging perfectly compatible with human physiology based off of nothing more than a verbal physical description, no plans or schematics required, in a matter of hours.
Genki Girl: A darker example than most. She is a bubbly girl with a happy-go-lucky attitude matched only by her pure joy of the thrills of battle.
Grew Beyond Their Programming: Questionable canonicity notwithstanding, and perhaps not to the same level as Observer, but its clear the events of Looking Glass of Fact and Fiction and World-Spanning Arclight changed her somehow.
I Just Want to Be Normal: As Purity, she admits that she always wanted to be a school teacher during the SSSS.GRIDMAN / SSSS.DYNɅZENON collab event.
Names to Run Away from Really Fast: Among the Sirens with story roles, her name alone implies violence, and she does quite enjoy her job of "purifying" Siren experiments.
Prestige Peril: Played for Laughs during the 2023 Special Popularity Poll.
Purity: "What is this and why should I care? I'm bored already... no, don't vote for me, you losers! ... I'll be in deep shit if I get more votes than Observer."
Slasher Smile: Her default expression, at any rate.
Surfer Dude: A female example. The way she speaks is Somewhat Radical, and she travels across the sea by riding on her shark-shaped weapon equipment.
Stripperiffic: Her clothes leave every little to imagination.
True Final Boss: Of Crosswave, along with Observer, as the enemies you'll face for the final level of Extreme Battle Mode.
Vapor Wear: Her sailor shirt is rather transparent, and she appears to be wearing nothing underneath that, furthermore, she also wears very short skintight shorts.

The Key

Key Point G (Chinese); Code G (Japanese); Enterprise META (English); Ash^noteformerly Flare

See Azur Lane Ashes.

The Dreamweaver

Observer 0 (Chinese, Japanese); Dreamweaver (English)

https://static.tvtropes.org/pmwiki/pub/images/dearmweaver.jpg

The Magister's Beloved

A mysterious Siren who makes her debut in the "Fallen Wings" event. During the third scene of the event, Observer Zero is introduced having a Cryptic Conversation about the fate of humanity with an equally enigmatic character named the Inquisitor when the latter's fleet is being overwhelmed by an unknown enemy.

The Magister (previously the Inquisitor before it was retranslated) laments the fact that humanity couldn't win even with the power of the Sirens^note, and talks evolution and the tragic ending due to their weakness. The Magister then tells his "beloved Zero" to begin the Inquisition Plan, telling Zero the past of humanity is now in her hands. Accepting the mission, Zero leaves as the Magister goes on a suicidal last stand.

Amazing Technicolor Population: Not merely an albino, everything about her except for her visible eye, a few strands of her hair, a few parts of her clothing, and her equipments are colored pure white.
Animal Motifs: Jellyfish. She has a giant jellyfish-like compartment dyed in transparent blue behind her body, and her white mantle would make her look like a white jellyfish if she covers her body from view with it. Specifically, it's Turritopsis dohrnii... better known as the 'immortal jellyfish,' famous for its ability to regenerate as a polyp and then metamorphosise into a jellyfish, in a theoretically never-ending cycle of death and rebirth.
Cryptic Conversation: Pretty much everything she has ever said.
- In her debut scene, her conversation with the Magister:
Observer Zero: "We cannot defeat them, even with the power of Sirens^note. Then we must create an artificial environment to force adaptation and natural selection for survival."
The Magister: "Evolution through unending selection and strife. Until we have a sample with power to defeat them. Countless lives will be lost in the process. But that is the price of our (humanity) weakness."
*The data server they are communicating in is set ablaze*
The Magister: "Seems like this is it. My beloved Zero."
Observer Zero: "Yes."
The Magister: "Commence the operation. The future, no, the past of humanity is in your hand."
Observer Zero: "Yes, sir."
- Fallen Wings has a scene which entirely consists of her having a monologue to the Arbiters:
Dreamweaver: "And the Lord said to them, I have seen Satan fall from the sky like a flash of lightning. All the angels who followed him in rebellion were transformed into the ugliest of images, but still retained their wings of light. The Creator could not bear to see his most precious work turned to dust, wishing so that they could shine even in hell. Humans really know how to write interesting stories...However, I don't think the Testers and Purifiers - the "lower level terminals" - are going to be able to keep her in check. Well...you'll have to take a trip to "hell" next...Arbitration Authority" ^note
- Ashen Simulacrum event shows a conversation between Zero and Key Point G in a flashback:
Key Point G: "Out of the way, Zero."
Observer Zero: "The Magister is not taking visitors today."^note
Key Point G: "What is the meaning of this...? Why didn't you send reinforcements?!"
Observer Zero: "And if we had, would it have changed your or your Creator's fates? We did everything we could do. We lose in every permutation of that scenario."
Key Point G: "...I'll ask again: why didn't you send reinforcements?"
Observer Zero: "Why are you here? Why now? Why at this time? Why this 'world'?"
- Ashen Simulacrum also has Observer Zero doing another monologue at present, though this time it's made clear she is speaking to someone:
Observer Zero: "There once was a white whale by the name of Moby Dick. And the story of the men who pursued it - that is, the tale of their adventure - is connected by a chain of excitement and disappointment, hope and despair. We believe that they will locate Moby Dick eventually. Otherwise, their story would never have a conclusion. And all stories, whether comedy or tragedy, must have closure. Regardless of how this story ends, I will continue to observe. If that Beacon you placed serves as a space-time signpost that can bend timelines... then I deem it necessary to augment my Master's authority over timeline observation, control, and travel. We will not let you crush our hopes. We are hope itself. Arbiter: The Empress III, initiate startup sequence. Protect the future of the Past to your dying breath."
Arbiter: The Empress III: "I have already witnessed their end. Pray that this world can keep me entertained..."
Greater-Scope Villain: At least according to Ashes. Dreamweaver is in charge of executing the "Inquisition Plan" which was meant to ultimately have both Sirens and Ashes work together. Dreamweaver had a problem in executing the plan, the plan in progress didn't match the original plan by the Creator and Magister, and the Sirens made a mistake, with Dreamweaver usually destroying failed timelines. This eventually causes Ashes to separate themselves from the Sirens.
I Have Many Names: Apart from being Observer Zero, she has been called Lyn by the Magister, and the English version of Fallen Wings also names her Dearmweaver◊ (which might or might not be intended to be Dreamweaver).
Innocent Blue Eyes: Her only visible eye is glowing light blue, which stands in stark contrast to the Supernatural Gold Eyes that all Sirens (bar Key Point G) exhibit.
Intrigued by Humanity: In her new scene in the Fallen Wings, she comments that humanity really makes things interesting for her.
The Leader: In "Pledge of the Radiant Court", Renown META reveals that Zero is the head of Antiochus.
Lonely Doll Girl: Her general theme, reinforced by the fact she is never seen interacting with the other Sirens and the small doll she carries everywhere she goes.
Sci-Fi Bob Haircut: Combined with Mystical White Hair which enhances her enigmatic impression.
Shout-Out: Her general design brings to mind the princess-class and the generals of Abyssals from KanColle.
Simple, yet Opulent: Her small dress and huge mantle are a rather simple clothing design for Azur Lane characters, but it makes her stand out from the others all the same, especially when compared to the other Sirens.
Walking Spoiler: Even more so than Key Point G, seeing as her first lines alone spoil the nature of the entire Azur Lane world as well as the Sirens' methodology.

The Ember

Ember (English); Code T; Takao META

See Azur Lane Ashes.

The Northern Sentinel

Omitter

Animal Motif: A Basking shark.
Interface Screw: Among her many weapons are screen-darkening projectiles which also briefly disable torpedoes, airstrikes, and battleship salvos.
Wave-Motion Gun: After the Royal Navy shipgirls speculated that the enormous cannon on her back was just for intimidation during the Aurora Noctis event based on intelligence from the Northern Overture event suggesting she doesn't actually use it, she decides to unleash it upon them in their battle, firing a massive beam at the Royal fleet.

The Young Program

Compiler

The Girl in the Fog

A Siren first encountered during the defense of the Canal Stronghold in the Microlayer Medley event, Compiler appears to be a comparatively "young" Siren, not just in appearance but even in fact. She leads the assault on the Canal at the direction of Observer, trapping the Eagle Union defenders and attempting to annihilate them from beneath the waves before she has to fight directly. It is entirely possible that the entire thing was just a cover for establishing a connection between Ash and Enterprise, as Enterprise was shown what appeared to be a record of Ash forming a group of shipgirls, including several E has both fought against and alongside.

Animal Motif: Her rigging resembles an upright giant isopod. Fitting for a shielded submersible.
Alas, Poor Villain: It's hard not feel a bit of empathy for her as she tries to grasp at the fact that she's actually dying, especially considering that she appears to be one of the younger sirens.
Awful Truth: In her final showdown in Rondo at Rainbow's End, Compiler attempts to inflict crushing despair on the combined attacking forces by showing the High Seas Fleet, Zuikaku, and the Eagle Union fleet their historical fates that would have happened without the Sirens' interference - being scuttled at Scapa Flow, being hunted down and killed by the Eagle Union, and being annihilated in nuclear testing. Not a single one of them falters for even a second.
Death by Irony: At the end of Tower of Transcendence, Observer Alpha expresses a sort of existential crisis to Compiler at the realization that all it would take is for their backup data to be lost for an Elite Siren to be able to be Killed Off for Real. Guess what happens to Compiler at the end of Rondo at Rainbow's End?
Degraded Boss: Weaker Compilers act as the roaming bosses of stage B/D3 of Rondo at Rainbow's End.
Just a Kid: Evidently. Observer refers to her directly as "young program" at one point when debriefing her.
Killed Off for Real: In the finale of Rondo at Rainbow's End, her mainframe is destroyed by the overwhelming firepower of the Ironblood, Eagle Union, Sakura Empire, Northern Parliament, and META all being focused upon it. Through Helena META's hacking, we see her final moments as her program shuts down indefinitely. Her demise is, if not truly permanent, at least suggested to be long-lasting while normally Sirens are able to rely on their mainframes and an endless supply of backup bodies to invoke Death Is Cheap.
Ninja Pirate Zombie Robot: As the Eagle gals defending the Canal point out, she's submersible, has aircraft, mounts main batteries, fires torpedoes, and possesses a vanguard-like defense shield; they still classify her as a "submarine" even though, more than any other Siren, she breaks every known extant ship classification.
Bremerton: Isn't that kit way too overloaded?!
Oh, Crap!: In Inverted Orthant after having been fooled into believing her deception is working only for Eugen to reveal that she knew all along what was going on. The moment Eugen has U-37 destroy the mirror sea generator and reveals Strasser has an absolutely massive airstrike coming to destroy her, Compiler overloads her engines and runs like hell. She only just barely gets out of the way in time.
Robot Girl: She's rather more "robotic" than a number of her compatriots; this could very well be how Sirens are when they are "young", and may emphasize how they are very much Artificial Humans. Notably, she's fairly comparable, even visually, to Z46 and Gascogne, two similarly "young" ships with no true history.
Unknown Relative: "Rondo at Rainbow's End" reveals that Compiler was Dr. Aoste's second creation, after Zero. Ironically, this makes her the second oldest Siren.

The Arbiters

The Arbiters are a recently encountered Siren force whose main purpose seems to be dealing with the Ashes faction. They employ their own version of elites called the Enforcers. At the end of Dreamwaker's Butterfly, the Elite Sirens mention that the Arbiters function on a different program and are almost exclusively concerned with Code G...

During Operation Siren, the Arbiters are encountered by the various forces of the Azur Lane and the Crimson Axis. Each Arbiter seems to have powerful abilities they can use outside of Mirror Seas. Arbiter: The Hermit IX is the only one encountered in battle so far.

Body Backup Drive: Similar to the Elite Sirens, Arbiters store their personal data on physical servers in heavily-fortified Mirror Seas, allowing them to create new bodies in the event they're destroyed. Unlike the Sirens, it is confirmed that each Arbiter has multiple servers housing their data, creating a level of redundancy that makes the already daunting prospect of 'killing' one like what happened with Compiler even more difficult.
Tarot Motifs: All the Arbiters seem to be named after the major arcana.

Arbiter: The Empress III

Arbiter: The Empress III (English)

https://static.tvtropes.org/pmwiki/pub/images/sample_c92ef4ab735d96405aa39c7ab0c4bf7e.jpg

The Witness to the End of the World

Animal Motif: Sharks.
The Cameo: She briefly appears at the end of "Ashen Simulacrum". Considering the nature of the Operation Siren game mode (featuring boss battles against the Arbiters), she's likely going to have a significant role there down the line.
- She makes another appearance in the ending of "Khorovod of Dawn's Rime" alongside Observer Zero, commenting on the Commander blinking out of the timeline within microseconds (implied to be the three Strings scenes). (In the CN script, she also confirms Zero's suspicions that Observer Alpha has something unique about her, but even unique Observers like Alpha shouldn't be able to detect Empress manipulating their experiments.)
Ms. Exposition: Her monologue in the epilogue of "The Fool's Scales" confirms that Arbiter: The Hierophant V was influenced by Deus X.

Arbiter: The Hierophant V

Arbiter: The Hierophant V (English)

Ambiguous Situation: Has she been compromised by Deus X, or is she assisting it towards peace with humanity?
Arc Villain: Of "The Fool's Scales".
Demonic Possession: For some reason, Memphis META's database doesn't recognize the Hierophant. Hiryuu META, who has fought the Hierophant before, thinks something is taking advantage of her powers and mass-production capabilities.
Early-Bird Cameo: She has appeared multiple times in earlier events, but only as a fleeting shadow (which is later confirmed to have been in the Commander's nightmares). She makes her proper debut in "The Fool's Scales".
Eldritch Abomination: Her appearance in nightmares gives her this feeling. Also, the unique design of her generic ships is like a twisted mishmash of mechanical and organic parts.
Ghost Memory: It's implied that she gives the Commander a record of her origin when they meet each other in-person during "The Fool's Scales": she was the first of the Arbiter Program (Dr. Aoste considered Zero one-of-a-kind and unrelated to the Arbiters), and Dr. Aoste strengthened her recognition of language and concepts and installed modules to heighten her empathy and friendliness, such that she easily passed the Turing test. He designed her primarily to completely eradicate Deus X for all the blood shed by humanity.
Hidden Villain: Her presence is implied to have been the reason Arbiter: The Devil XV was acting strangely in the Reality Lens during "Parallel Superimposition".
Hijacked by Ganon: Her unique generic ships apparently came from a new faction summoned by Marco Polo, but they turn out to be just Sirens. However, Empress confirms that Deus X of the Leviathans actually was involved.
Hopeless Boss Fight: During the interactive boss fight scene against "Incarnation of the Hierophant", she takes scratch damage from all types of damage your Guest-Star Party Member fleet can deal. She doesn't even lose her first health bar before she leaves.
It Can Think: Dr. Aoste explicitly told Dr. Anzeel that the Hierophant's the first Siren designed to "understand others on a deeper level and express emotions like any human being".
Non-Standard Character Design: She looks more like an Abyssal from KanColle than a Siren, having more organic parts than the others that are almost purely mechanical. She also has unique generic ships that are not only uniquely named, but also looks like they belong to Nurgle Cultists or The Beast from Homeworld.
Speaks Fluent Animal: When Dr. Aoste first created her, he noted that she can already communicate with cats, dogs, and dolphins, and believed that she could "surpass the heights of the Tower of Babel".
Wild Card: In the epilogue, Arbiter: The Empress III notes that the Hierophant has apparently been compromised by Deus X in some way, and wonders why the Hierophant didn't trigger her self-destruct protocol. Notably, if the Commander agrees with Dr. Anzeel and thinks Deus X can be reasoned with, he sees a flash of light in the Hierophant's eyes, implying she wants Deus X and humanity to be at peace.

Arbiter: The Lovers VI

Arbiter: The Lovers VI (English)

Animal Motif: Sea angels.
Arc Villain: Of "Tower of Transcendence".
Healing Factor: According to Scharnhost META, The Lovers can deconstruct and reconstitute herself at will within her domain, using the resources from the endless seas of debris to regenerate herself.
The Speechless: She doesn't say a word when encountered or damaged.

Arbiter: Strength VIII

Arbiter: Strength VIII (English)

Artificial Limbs: Two gigantic prosthetic gauntlets that surpass even Spee's.
Covered with Scars: Her body is riddled with them.
Shout-Out: Her name and gauntlet-hands bring to mind Strength from Black★Rock Shooter.
Tsundere: Lampshaded in her entry for the 2023 Special Popularity Poll.
Arbiter: Strength VIII: "'Tsundere?' You're just aching to feel the sting of my gauntlets!"

Arbiter: The Hermit IX

Arbiter: The Hermit IX (English)

Animal Motif: Anglerfish.

Arbiter: Temperance XIV

Arbiter: Temperance XIV (English)

Animal Motif: Squid.

Arbiter: The Devil XV

Arbiter: The Devil XV (English)

https://static.tvtropes.org/pmwiki/pub/images/bb00762f73e1b79f47e18657beab4fb2.png

Attack Drone: Probably the first sign of her presence is the unique drones she sends to aid generic fleets.
Arc Villain: Of "Parallel Superimposition".
Recurring Boss: She has continued to appear in later events as well, be it directly or helping behind the scenes with her Enforcers.
Support Party Member: She is able to enhance other Arbiters and make them stronger.

Arbiter: The Tower XVI

Arbiter: The Tower XVI (English)

Kaiju: If her artwork is properly to scale, her sperm whale-shaped rigging is massive compared to her.
Nonstandard Character Design: Compared to most Elite Sirens and other Arbiters. Rather then the pale ivory skin and blue lights that most have, the large majority of her body is an irridescent blue, with the white being used for pieces if armor and, more creepily, her face.
The Unfought: While most of Confluence of Nothingness event takes place in her domain, she only made a small appearance in a post-finale cutscene.

Characters / Azur Lane Sirens

Tropes that apply to the Sirens in general

Explorer

Chaser/Tracker

Scavenger/Oceana

Breaker/Peacebreaker

Conductor/Strategist

Lurker

Intruder

Elite Sirens

Observer α

Voiced by: Moe Toyota (Japanese), Natalie Van Sistine (English), Yotzmit Ramírez (Latin American Spanish)

Tester β

Voiced by: Chika Anzai (Japanese), Brittany Lauda (English), Sofía Huerta (Latin American Spanish)

Purifier

Voiced by: Marika Kouno (Japanese), Melissa Sternenberg (English), Jessica Ángeles (Latin American Spanish)

Key Point G (Chinese); Code G (Japanese); Enterprise META (English); Ash^noteformerly Flare

Observer 0 (Chinese, Japanese); Dreamweaver (English)

Ember (English); Code T; Takao META

Omitter

Compiler

The Arbiters

Arbiter: The Empress III (English)

Arbiter: The Hierophant V (English)

Arbiter: The Lovers VI (English)

Arbiter: Strength VIII (English)

Arbiter: The Hermit IX (English)

Arbiter: Temperance XIV (English)

Arbiter: The Devil XV (English)

Arbiter: The Tower XVI (English)

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Index

Next

Characters / Azur Lane Sirens

Edit Locked

Tropes that apply to the Sirens in general

Explorer

Chaser/Tracker

Scavenger/Oceana

Breaker/Peacebreaker

Conductor/Strategist

Lurker

Intruder

Elite Sirens

Observer α

Voiced by: Moe Toyota (Japanese), Natalie Van Sistine (English), Yotzmit Ramírez (Latin American Spanish)

Tester β

Voiced by: Chika Anzai (Japanese), Brittany Lauda (English), Sofía Huerta (Latin American Spanish)

Purifier

Voiced by: Marika Kouno (Japanese), Melissa Sternenberg (English), Jessica Ángeles (Latin American Spanish)

Key Point G (Chinese); Code G (Japanese); Enterprise META (English); Ashnote formerly Flare

Observer 0 (Chinese, Japanese); Dreamweaver (English)

Ember (English); Code T; Takao META

Omitter

Compiler

The Arbiters

Arbiter: The Empress III (English)

Arbiter: The Hierophant V (English)

Arbiter: The Lovers VI (English)

Arbiter: Strength VIII (English)

Arbiter: The Hermit IX (English)

Arbiter: Temperance XIV (English)

Arbiter: The Devil XV (English)

Arbiter: The Tower XVI (English)

Previous

Index

Next

Key Point G (Chinese); Code G (Japanese); Enterprise META (English); Ash^noteformerly Flare