Kamen Rider BLACK SUN / Characters

Character sheet for Kamen Rider BLACK SUN.

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Main Protagonists

Kotaro Minami/Kamen Rider Black Sun

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Present day Kotaro

^{Kotaro in 1972}

One of the Century Kings, and the Titular Character. Though he is old and weary of battle, an encounter with Aoi Izumi brings him back into the conflict between the Kaijins and the humans who oppress them.

Portrayed By: Hidetoshi Nishijima (Present Day), Aoi Nakamura (Younger), and Ryusei Iwata (Child)

Tropes that apply to Kotaro

Adaptational Jerkass: One of his first scenes has him beating up a homeless man for money, followed by him accepting a job to assassinate a young girl, and also mocking a kidnapped young Shinichi in 1972. Definitely a far cry from the original Kotaro.
Adaptational Wimp: The original Kohtaro/Black (RX) is an honest hero that has enough potential to surpass even the godlike Creation King. This version is more jaded in attitude, with human weaponry capable of harming him.
Age Lift: 19 years old in the original BLACK, 70 years old (present) and 20 years old (past) respectivly in Black Sun.
Achilles in His Tent: After the falling out of Gorgom and his failed attempt of killing the Creation King, Kotaro has spent 50 years as a bitter loner, staying away from the fight for Kaijin equality and doing jobs in order to get medication for his injured leg. It’s only after he has an encounter with Aoi that he starts getting dragged back into the conflict, whether he wants it or not.
Anti-Hero: Though Kotaro is a decent guy, he still brutally tears apart various Kaijin and other foes on screen. Moreover, one of the first scenes he has is him beating up a poor Kaijin in order to collect his debt.
Boomerang Bigot: Not to the point of Jin Takayama, but he is a Kaijin who believes that his race should be wiped off the planet. He intends to do so by destroying the Creation King so that no new Kaijins can be made. In his defence, he saw for decades how much abused they were at the behest of Japan's politicians and just wants his brethen to live a peaceful life before dying naturally.
Cool Bike: Owned Battle Hopper, a customized Honda CB750F Super Sport. While he's always seen casually riding it in his human form, he eventually rides it in his Rider form in the final episode, in a nice recreation of the original Kamen Rider BLACK's opening sequence.
Colour-Coded for Your Convenience: Dons an all black attire, contrasting Nobuhiko's light-colored clothing.
Dark Is Not Evil: Always seen wearing black clothing, but he's unquestionably one of the few decent person in this series.
Death by Adaptation: While both incarnations of Kotaro got themselves killed briefly and revived before the final battle, this version in the reboot ended up being mercy killed by Aoi after the Creation King assimilates him unlike his main counterpart who killed the Creation King and would go on to become Kamen Rider BLACK RX in the sequel.
Decoy Protagonist: He's the title character, but he spends much of the series tangential to the actual plot and its Aoi's actions that actually move the plot along. His and Nobuhiko's conflict ends up effectively being a side plot to Aoi's quest to uncover the truth behind the kaijins, and by the end Kotaro is dead while Aoi is the one carrying on the fight.
Handicapped Badass: Due to not having consumed Heat Heaven for around 50 years, his Kaijin body ages faster, resulting in his injured left leg's never healing entirely. He walks with a limp for the majority of the series, which does not stop him from beating Shadow Moon or ripping off the Creation King's heart. In fact, the first and only time he uses Heat Heaven in half a century is for the final battle, since he has just been revived from a coma and needs immediate energy then.
Older Than They Look: Kotaro was born in 1952, making him 70 years old. Unlike most Kaijin around his age who consistently eats Heaven to halt their aging, Kotaro stopped consuming the drug, thus making him look like a man in his 50's.
Parental Substitute: Acts as one for Aoi, as her parents have fallen victim to Gorgom's schemes. He really does care about her safety.
Retired Badass: Ever since his failed attempt on the Creation King and having his leg crippled in the process, Kotaro has lived as a hermit, doing jobs in order to get medication for his leg rather than consume Heaven to heal it.
The Hero Dies: Kotaro’s attempt to destroy the Creation King’s disembodied heart ends up turning him into the new Creation King, barely retaining any of his mind and will. In the end, Aoi Mercy Kills him through the Satansaber and a defense move that she learned from Kotaro.
This Is Unforgivable!: Kotaro's Catchphrase, a holdover from his original incarnation. He said this to Bilgenia after the latter turned Aoi into the Mantis Kaijin, and just before he transforms into his Rider form.
Would Hurt a Child: Perfectly willing to harm and kidnap Aoi at first, only stopping once he sees the Kingstone on her necklace.

Tropes exclusive to him as Black Sun

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Century King Black Sun

^{Black Locust Kaijin}

Animal Motif: Black Sun was themed after the Migratory Locust.
Fashionable Asymmetry: After having ripped out his left grasshopper leg to use as a sword, Black Sun spends the majority of his time onscreen as this
Glowing Eyes: The normally black eyes of Black Sun can light up in red when powering up.
Grievous Harm with a Body: Black Sun have two large grasshopper leg-like growths sprouting from his back, which are sharp and hard. He can rip these off and turn them into improvised swords. Notably, however, these do not regrow or heal after. Black Sun rips off his left leg-sword after his first proper henshin in Kamen Rider form during his fight against Bilgenia. This is where the iconic "snake eating the sun" symbol is branded later on.
Tron Lines: Reddish orange accents across his face, arms and legs, which can light up whenever Black Sun is powering up.

Nobuhiko Akizuki/Kamen Rider Shadow Moon

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Present day Nobuhiko

^{Nobuhiko in 1972}

The second of the Century Kings, and the main rival of Kotaro. He has spent the last 50 years in captivity by the Gorgom Party, and only managed to escape after discovering Kotaro was alive. Now free, he seeks to continue the original goals of the Kaijin Equality movement and its leader, Yukari…

Portrayed By: Tomoya Nakamura, Kanaru Suzuki (Child)

Tropes that apply to Nobuhiko

Adaptational Dumbass: Whereas the original Shadow Moon was a cold Evil Genius, this Nobuhiko is far more erratic and unstable once he takes power over Gorgom. His doesn't appear to have thought out his plan beyond obtaining the Kingstones and he's far more obsessed with exacting bloody revenge.
Adaptation Expansion: The original Nobuhiko was a Distressed Dude for most of the part as he was Out of Focus before being corrupted into Shadow Moon, while this Nobuhiko was active for the most part and became evil on his own.
Adaptational Villainy: He's a Tragic Villain like the original Shadow Moon, but unlike the original he isn't brainwashed at all.
Adaptational Wimp: Like the original Kohtaro/Black (RX), the original Shadow Moon was so powerful that he was predestined to surpass the godlike Creation King in prowess. This version is nowhere near as strong, with human weaponry capable of harming him.
Age Lift: 19 years old in the original BLACK, 70 years old (present) and 20 years old (past) respectively in Black Sun.
Cool Bike: His personal motorcycle Road Sector, a customized BMW R nineT.
Dark Messiah: Serves as this to the Kaijin of Japan. While once more moderate in his politics of Kaijin and human coexistence, he has since adopted a Kaijin-supremacist ideology after Taking a Level In Cynic from almost a century of oppression of Kaijin at the hands of humans, with plenty of sympathisers across the country.
Irony: The member of the Kaijin Equality movement who was the most adverse to violence ends up becoming a brutal Kaijin-supremicist.
Light Is Not Good: Though he dresses primarily in white, Nobuhiko is very brutal, and fully falls into the role of antagonist after becoming the new leader of the Gorgom Party.
Looks Like Jesus: During his imprisonment by Gorgom, due to being unkempt for a good while, he looks a lot like Jesus with his long hair and beard.
Mind over Matter: He eventually develops this power, akin to the Creation King
Older Than They Look: Nobuhiko was born in 1952, making him 70 years old. Much like most Kaijin of his age he consistently consumed Heaven to halt his aging, giving him the appearance of a man in his 30's.
Plot-Irrelevant Villain: Even though he's advertised as a major character, Nobuhiko's kaijin uprising doesn't make much of a dent other than setting off the events that lead to Bilgenia forming an Enemy Mine with Aoi and Kotaro's death.
Sanity Slippage: Torturous origins as a kaijin, failed romance and revolution, fifty years of captivity, and all with the possibility that it was All for Nothing... the show's events take a massive toll on his psyche.
Short-Lived Leadership: His tenure as leader of the Gorgom Party doesn't last very long, and his kaijin uprising gets put down pretty quick.
Stupid Evil: As both Darom and Baraom point out, Nobuhiko has no practical way of killing every single human and trying to lead a war of extermination against them would only drive the kaijin race to its doom. Unfortunately, Nobuhiko is too mad and insane to care.
Tragic Villain: Nobuhiko ends the series an extremist who has lost all sense of rationality and outright states he wants to make it so kaijins are the ones oppressing humans, but it's hard to deny that isn't the result of him getting put through the wringer.

Tropes exclusive to him as Shadow Moon

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Century King Shadow Moon

^{Silver Locust Kaijin}

Animal Motif: Shadow Moon was themed after the Migratory Locust.
Fashionable Asymmetry: He spends his time as Kamen Rider Shadowmoon without his right grasshopperleg on the shoulder, having detached it to use as a sword before.
Glowing Eyes: His black eyes can glow in green.
Grievous Harm with a Body: Shadow Moon have two large grasshopper leg-like growths sprouting from his back, which are sharp and hard. He can rip these off and turn them into improvised swords. Notably, however, these do not regrow or heal after. In Kaijin form, Shadow Moon rips off his right leg-sword in his fight against Bishum.
Tin Tyrant: His Rider form evoke this imagery, making him more menacing than Black Sun.
Tron Lines: Green accents across his body, which, like his eyes, also glows.

Aoi Izumi

A young Kaijin rights activist, who indirectly brings Kotaro into her fight. However, she holds dangerous secrets, some of which even she doesn’t know…

Portrayed By: Kokoro Hirasawa

Adaptational Heroism: Mantis Mutant is re-imagined here as Aoi's Kaijin form instead of being just another one of Gorgom's Monsters of the Week in BLACK.
Break the Cutie: She starts passionate and hopeful about Kaijin rights. Then nearly all her loved ones and friends get killed off one by one before she's transformed into a Kaijin as well. Its hard to blame her cynicism by the finale.
Composite Character: She acts as a Suspiciously Similar Substitute for both Kyoko Akizuki and Katsumi Kida, being targeted by the Gorgom cult and having close relations with Nobuhiko and Kotaro, and also the Mantis Kaijin thanks to Bilgenia's experimentation.
Daddy Had a Good Reason for Abandoning You: Twofold. Both her parents are on the run from the Gorgom Party, and by extension the Japanese government, for their expertise with Kingstone.
No Celebrities Were Harmed: She's essentially Greta Thunberg if she was a activist for Kaijins and later leader for an radical resistance movement against the Gorgom Party.
Spotlight-Stealing Squad: She could easily be taken as the main character of the series instead of Kotaro, who spends much of the present day plotline in an incidental role. It's her who ends up exposing the truth behind the kaijins, something which is shown to have far more of an impact than anything Kotaro and Nobuhiko do.
Trauma Conga Line: Oh boy. Aoi and her Kaijin friend Shuusuke are attacked by the Spider Kaijin, then she watches another Kaijin kill her second mother figure and brutally beat a transformed Shuusuke (who only survives thanks to getting some Heaven), all over the Kingstone she was gifted by her parents. She is attacked by her brainwashed and Kaijin-ified father and watches him be killed before being betrayed by a friend and being turned into a Kaijin herself (and watches her mother get killed in front of her), then gets kidnapped and nearly turned into the next Creation King. After a brutal and traumatizing escape, she then finds out that Shuusuke was lynched, that Kaijin were created as human weapons, and, to put the cherry on top, ends up having to Mercy Kill her mentor figure using the very same defense move he had taught her. Dear sweet Jesus, someone give this girl a hug.
Unskilled, but Strong: With a driver, her combat performance as the Mantis Kaijin is almost on par with the Century Kings. However, even with the training Kotaro gave her, she's still had just developed her own abilities and is only able to get the upper hand on her opponents through external assistance.

Kaijin Allies

Shunsuke Komatsu

Portrayed By: Kaiki Kimura

A personal friend of Aoi's and one of the primary reasons she became an activist. A sparrow kaijin.

Butt-Monkey: Nothing goes right for the poor kid. A victim of racism, seemingly friendless outside of Aoi, and even his family doesn't seem to think much of him.
Grew a Spine: His primary arc is his attempts to build his strength and become a useful, confident member of his community. Unfortunately, standing up to anti-kaijin protestors is what costs him his life.
Sacrificial Lamb: Just when Nobuhiko's ready to give up, Shunsuke's death sparks his final evolution into a proper Shadow Moon.

Nick

Portrayed By: Jua

Another friend of Aoi's and an expert in kaijin history, particularly in regards to the Gorgom Party.

Bond One-Liner: Gives one to Shinichi Dounami after decapitating him:
Nick: Never forget, Oliver Johnson!
Easily Forgiven: No one seems to begrudge him long for selling out Aoi for the sake of being uplifted into a kaijin.
Mr. Exposition: Provides Aoi and the audience with the broader public details of the Gorgom Party's history, before the show's flashbacks can cover the more private events. Deconstructed: Despite his knowledge of the show's setting, his youth and immaturity mean he doesn't seem to fully grasp the emotional impact of those events. It isn't until its too late for Aoi's humanity that he grasps that the Gorgom is not the group it used to be.
Only One Name: Is often referred to as Nick. This is to hide the fact that his father was Oliver Johnson, making his full name Nick Johnson.
Small Role, Big Impact: An incidental friend to Aoi, with far less screentime than Shunsuke or his family. But he's briefly possessed the Kingstone, responsible for Aoi's kaijin-fication, and the one who lands a killing blow on Dounami.
Wrestler in All of Us: Lands the final blow on Shinichi with an Lariat.
You Killed My Father: One particular reason he opted to be turned into a Kaijin was to get revenge on Shinichi Dounami for killing his father Oliver Johnson. He gets his vengeance when he decapitates Shinichi in the final episode.

Gorgom Party

The Three Priests

The leaders of moderate political party who proclaim to fight for equal rights for Kaijin. In reality, they've traded away their activist roots to ally with Dounami and gain political power.

Adaptational Context Change:The original series portrays Gorgom as a cult with a longstanding, shadowy history and massive social, business and political influence. In BLACK SUN, they more resemble an organization the original Gorgom would have used as a front. They essentially started out a quasi-hippie minority movement that sought to liberate their kind of Kaijins, before turning into the shadowy influential institution in bed with the Japanese government.
Adaptational Nice Guy: While he was a ruthless Sinister Minister in the original BLACK, this Darom isn't a villain so much as someone who's had to make some hard bargains in order to do what he believes is best for his people.
Adaptational Wimp: In the original series, all three were among the strongest members of Gorgom, viewing humanity as little threat towards them. This series shows no such level of prowess.
Alas, Poor Villain: Darom dies rather sympathetically, after a failed attempt to talk down Bishum and Shadow Moon from leading Gorgom in a Kill All Humans direction.
The Alleged Boss: It's a wonder why anyone follows Darom considering how weak-willed and ineffectual of a leader he is.
Became Their Own Antithesis: Gorgom started out as a quasi-hippie revolutionary group dedicated to liberate Kaijin. By the time of the present-day storyline, however, the majority of the group besides Kotaro and Nobuhiko have become the very ruling party they once despised, and are if anything even worse in how they've furthered discrimination wholesale.
Cut Lex Luthor a Check: They actively work to keep the kaijin process covered up and only use to make kaijins for Dounami to traffic, even though becoming a kaijin offers a lot of humanitarian benefits that would no doubt be appealing to some. If they went public about the kaijin procedure and started offering it as a transhuman cure for illnesses, they would no doubt make significant gains towards kaijin acceptance and make a hefty profit in the process, especially since there's plenty of powerful and influential people who would no doubt find the prospect of superhuman powers appealing. This was actually the tactic the original Gorgom used in BLACK to recruit upper class members to their cause, but it would seem that the High Priests in this show aren't as clever as their original counterparts.
Hypocrite: Bishum frequently derides Nobuhiko for putting his own desire for revenge over the needs of the Kaijin. Given that she sold out her entire species for the sake of political gain, she hardly has much room to talk.
More Deadly Than the Male: Bishum is the one Gorgom to survive and possibly even emerged more powerful by the show's finale. She manages to effortlessly dance around the wider factional chaos, betray both her allies with terrifying speed, and generally display far more cunning that either of her so-called friends.
Not-So-Well-Intentioned Extremist: Unlike Darom, who seems to genuinely believe his sacrifices were necessary, Bishum and Barom are primarily interested in maintaining their own power and take malicious glee in enforcing their authority.
Plot Armor: Even though she threw her lot in with a kaijin uprising dedicated to killing all humans, Bishum somehow escapes being prosecuted for that by Nimura's extreme anti-kaijin administration and even lands herself a spot in it.
The Quisling: They've achieved assembly in the National Diet and present themselves as moderate political figures, yet they've only made themselves complicit to widespread oppression and violence inherent in the government.
Sole Survivor: Bishum is the only original member of Gorgom to have survived into the present day as of the final episode.
Well-Intentioned Extremist: Darom has dedicated his life to ensuring the kaijin can survive through the Creation King, even willingly presenting himself as a potential replacement if necessary. This proves he's a genuine believer in the necessity of the Creation King, rather than the immortality seeking Dounami cronies his associates have become.

Bilgenia

A bloodthirsty ancient armored fish kaijin who was originally a rebel leader of the Gorgom movement and later became Shinichi's bodyguard in the present time.

Portrayed By: Takahiro Miura

Adaptational Backstory Change: The original Bilgenia was an ancient warrior born 30,000 years before he is unsealed in the present day, while this Bilgenia was presumably a modern-day man who was turned into a Kaijin sometime after World War II.
Adaptation Species Change: He has a Ostracoderm motif as opposed to the original Bilgenia's birkenia motif.
Adaptational Villainy: Much worse than the original Bilgenia. While unlike his original TV show counterpart he was once a genuine believer in the Creation King, this Bilgenia is a lot more sadistic and does things that are far nastier than anything his TV counterpart did, such as tricking Nobuhiko into eating his Love Interest and forcibly turning Aoi into a Kaijin while forcing Aoi's mother to watch, then forcing Aoi to watch as he murders her mom. Even when he forms an Enemy Mine with Aoi, it's mostly just to get back at those who wronged him.
Adaptational Wimp: The original Bilgenia was one of Kamen Rider Black's most dangerous foes among Gorgom, especially when wielding the Satan Sabre. This Bilgenia ultimately bit the dust from a platoon of human soldiers.
Adapted Out: His signature weapons Bilsaber sword and Biltector shield, and his personal vehicle, the Hellshooter which was in the original BLACK, were not seen anywhere in the series.
Cool Sword: Wields the Satan Saber, which was made to protect the Creation King. Said weapon can also be used to truly kill the Creation King.
Cop Killer: Bilgenia targets Anti-Firearms Squad operators sent to get rid of Aoi after she made her statement online to the UN in New York.
Enemy Mine: The only reason he sides with Aoi at the end is to get back at Nobuhiko and Dounami.
Hate Sink: Bilgenia is repeatedly characterized as being self-serving and sadistically cruel. While he may have once believed in something, by present day he lives for little reason other than to torment others.
Heel–Face Revolving Door: From acting as a founding part of Gorgom, to resisting it with the heroes, to joining up and becoming the personal enforcer and bodyguard of Dounami, to getting kicked out once Nobuhiko takes over, to allying with Aoi for a final stand. For much of the show, his primary interest is in his own survival, regardless of who's offering.
Kick the Dog: Bilgenia's whole modus operandi seems to involve being as excessively cruel as possible. Stand out moments include tricking Nobuhiko into eating his dead love interest and murdering Aoi's mom, after making her watch as he forces her daughter to become a kaijin.
More Despicable Minion: It says something when Bilgenia is so despicable he's even able to give Dounami a cool moment when the latter kicks him down.
Mutual Kill: Suffers a final blow from a police officer, but kills him in return.
Rasputinian Death: His death is essentially a recreation of Musashibo Benkei's death, except the arrows are replaced with bullets and the samurai with police.
The Sociopath: Bilgenia is petty, utterly self-concerned and very sadistic, to the point of gleefully mocking others as he's tormenting them.
Wrecked Weapon: The Satan Saber is wrecked during Bilgenia's final stand against the police. However, its blade is still intact, which allows Aoi Izumi to deal the killing blow to the Creation King.

Yukari Shinjo

A founding member of the Gorgom Movement, prior to its alliance with Dounami. Her relationship with Kotaro and Nobuhiko has left a massive mark on their modern psyches.

Portrayed By: Haruka Imou

Ambiguously Evil: A genuine believer in the kaijin cause, who wants to kill the Creation King to provide some assurance of a peaceful lifespan for the kaijin? A spy for the government to regain control of the Creation King, as Dounami claims? Or some third goal that she kept hidden from Nobuhiko? Her true motives are never confirmed, which only worsens Nobuhiko's mental stability. By the end of the show, no one has revealed if she's really a loyal Gorgom member or not.
The Lost Lenore: Nobuhiko's torch for her is specifically pronounced, although all surviving members of the Gorgom Movement are impacted by her demise.
Posthumous Character: The how and why behind her death is gradually unraveled as the show's plot unfolds.

Creation King (Unmarked Spoilers)

The pinnacle and the very origin of the Kaijin, who is essential for their existence.

Achilles' Heel: The Satan Saber is the one weapon most capable of putting down the Creation King for good.
Adaptational Wimp: The Creation King in the original BLACK was essentially a god, and even when reduced to a heart, still had enough power to influence its followers and potentially end the world. In BLACK SUN, while it was capable of being a super soldier in the past, it never displays the godlike powers the original did have, and in the present day, while it does have the same physic powers that the original had alongside the body-surfing upon death, it doesn't have much influence over the Gorgom Party and serves as a figurehead as well as a source of Heat Heaven.
Beat Still, My Heart: Kotaro rips its heart out of its body. However, even when ripped out of its body, part of the Creation King still lives in the heart
Body Surf: Even when reduced to a heart, it's able to assimilate the victorious Century King.
Empty Shell: By the time its heart gets ripped out by Kotaro, the Creation King has effectively become this, showing very little free will, and only defends itself due to insticts
Fate Worse than Death: While the Creation King was able to somewhat use telepathy to communicate with its followers, alongside being able to move its arms a bit even in old age, it's unable to move from one place to another without external assistance, and is unable to transform back into its human form.
Mind over Matter: Its primary means of self - defense, which has been used to disable Kotaro's leg in the past
Monster Progenitor: Essentially the origin of every Kaijin born from an experiment.
No Body Left Behind: When struck by the Satan Saber, its body alongside Kotaro's disintegrates, leaving behind only dust.
Transhuman Abomination: Even by Kaijin standards, the Creation King's origin is completely bizarre and eldritch, as it was created by Michinosuke's experiments on a prisoner of war during a combination of a solar eclipse and a grasshopper plague. To make matters worse, it's capable of surviving as a heart and can assimilate those into its role whom it deems worthy of.
Total Eclipse of the Plot: The Creation King was created during a solar eclipse in concurrent with a grasshopper plague.
Walking Spoiler: The origins of the Creation King reveals a lot in the series.
Was Once a Man: A former P.O.W. captured during World War II, he was turned into the very first Kaijin thanks to Michinosuke's experiments.

Japanese Government

Shinichi Dounami

The current Prime Minister of Japan. While presenting himself as even-minded, his ties to the Gorgom Party help cultivate a sinister future for an already dangerous worldwide status quo.

Portrayed By: Lou Oshiba (present day), Oshiro Maeda (1972)

Adaptational Dumbass: While Ryuzaburo Sakata, whom Dounami is a Suspiciously Similar Substitute of, seemed to be a savvy and intelligent politician from what we saw of him, Dounami is comically Stupid Evil.
Asshole Victim: Not even his secretary shows pity upon his undignified death all thanks to the abuse he sowed upon the latter.
Big Bad Wannabe: Isn't much more than a figurehead when you get down to it. He isn't very intelligent and has little skill as a politician, instead relying heavily on the Gorgom Party and his own aides to get anything done.
Cut Lex Luthor a Check: He could very well make a legitimate profit by just offering kaijin conversions to people who want them, instead of just creating kaijins from unwilling hosts and trafficking them for profit in a needlessly complicated and cruel plan.
Excrement Statement: At one point, he decides to piss on a memorial for Kaijins. However, this proves to be his undoing, as he was lured into a trap where he could be killed without causing any succession issues.
Evil Is Petty: His malicious vendetta against Nobuhiko makes a certain amount of sense, considering the kaijin's role in Shinichi's kidnapping. But holding onto the grudge for fifty years, under constant torture, cruelly mocking Nobuhiko's crush on Yukari simply to break the man's spirit, capped off with the above-mentioned Excrement Statement... it doesn't get much pettier.
Flat Character: He's your typical sleazy, corrupt politician, without much depth beyond that.
Greed: His primary motivation behind his manipulations.
Hate Sink: This is nothing to like about Dounami. He is a bigoted, petty, greedy and utterly self-serving scumbag with absolutely zero redeeming qualities of any kind, and he's not even a remotely skilled politician at that. His brutal death at the end, engineered by his own subordinate in an act of spite, is very well-deserved.
Identical Grandson: He looks very identical to his grandfather Michinosuke in the present day, even sharing the same actor with him.
Nepotism: By all accounts, the man's only in politics because its the family business. He has no real political sense and only seems to maintain popularity and power because of 1) competent assistants like Nimura and 2) the brute force his Gorgom connections allow him. This is particularly notable in the finale, where he mocks the opposition to prove that his grandfather was involved in human experimentation... unwittingly giving his political enemies permission to expose all his grandfather's crimes right then and there.
No Historical Figures Were Harmed: He shares more than a few similarities to former Prime Minister Shinzo Abe. While his official party affiliation is left ambiguous, Dounami is introduced denying that the role of Japan in the creation of Kaijin. Abe was frequently criticized for his denial of Japanese war crimes in WWII. Dounami's ties to the Gorgom Party also parallels Abe's ties with the Church of Unification and the criticisms of those ties that ultimately lead to his assassination in 2022 (which due to happening only months before the series' release, was most likely a coincidence).
Politically Incorrect Villain: His Kaijin bigotry being the most obvious Fantastic Racism aspect of his character. But it doesn't get more politically incorrect than sacrificing elderly, poor, and LGBTQ civilians to create Kaijin and/or fuel for Kaijin, all to line his own pockets and to create an underclass to exploit.
Spoiled Brat: Flashbacks to the 70s demonstrate that he spent most of his teen years as an oblivious, self-centered racist. He barely seems to recognize his kidnapping as a real threat to his safety, blithely complaining all the while. As an adult, while presenting himself as intelligent, it becomes clear he hasn't really changed.
Straw Character: Is a thinly-veiled potshot at Shinzo Abe and his administration.
Stupid Evil: He's far less creative and ambitious than his grandfather. Unlike his grandfather's grand schemes, he's content to merely line his own pockets. In one notable scene, when the opposition demands real answers from him, he simply repeats his secretary's words verbatim, less than a minute after his secretary spoke on his behalf. However, this doesn't make him any less of a persistent danger to kaijin. His evil is simply more banal and bureaucratic.
Suspiciously Similar Substitute: To Ryuzaburo Sakata, being an head of a political party that is a front for a cult. Unlike Ryuzaboro, he has a more significant role compared to him, and unlike the EP Party, the Gorgom Party was formed not as a front, but a subversion of the former Gorgom's ideals.
Undignified Death: The ending has him first hit by Koumori's "Rider Kick", then decapitated by Nick's lariat. And since this occured at a pro-Kaijin area, his death almost goes unnoticed by everyone.
Villain with Good Publicity: He's well-loved by the public, but his passive and aggressive violence against kaijin creates the central conflict of the show.

Michinosuke Dounami

The former Prime Minister, Shinichi's grandfather, and an influential figure whose impact on Kaijin haunts over the characters far into the present.

Portrayed By: Lou Oshiba

Greater-Scope Villain: The man responsible for creating the kaijin in the first place and the one who has instigated the show's entire premise.
Manipulative Bastard: Even when threatened with his own grandson's kidnapping, he manages to effortlessly turn the tables and sway the Gorgom Party to his own machinations. Although this is mostly thanks to Darom uncritically taking him at his word.
No Historical Figures Were Harmed: The Nobusuke Kishi to Shinichi's Shinzo Abe. Much like Dounami, Kishi was a prominent political figure who managed to hold onto his power after WWII, despite being one of the key signatures on Japan's declaration of war against the Allies. Aside from his war exploits, Kishi was also known for successfully uniting numerous political parties into the massive Liberal Democratic Party, crushing any opposition to their majority. This is exactly the strategy Michinosuke employs against the Gorgom. Both he and Kishi were also notable war hawks who consistently attempted to rebuild Japan's military, to no avail. It heavily implied that the lab that created the Kaijin may have been created in the real life Unit 731, an unethical experimentation lab formed by Nobunosuke.
Posthumous Character: Long-dead by the story's present, but his legacy (through Shinichi or the general status quo) casts an enormous shadow.
Stupid Evil: Developed a process that could turn his people into a transhuman Master Race. Does he sell it and use it to uplift his people while making himself extremely rich in the process? No, he uses it on a select few and then oppresses and marginalizes them.
Visionary Villain: His primary dream is to rebuild Japan's army and is willing to ally with anyone to achieve that. As well as create an entire race of kaijin to use as weapons.

Isao Nimura

A straight-forward, if dull government man who works under Shinichi Dounami.

Portrayed By: Toshinori Omi

Butt-Monkey: Dounami clearly doesn't like him much, openly insulting him and stealing his speeches for short-term profit. There's little else he can do except politely grovel underneath the Prime Minister's authority.
The Dog Bites Back: After all the abuse he suffered, he helps engineer the Prime Minister's death by dropping him off in the kaijin districts that hate the PM.
Dragon Ascendant: Following Dounami's death, he quickly rises up to the role of the new Prime Minister.
Not-So-Harmless Villain: Its unlikely any of the cast is aware of him, given he's just another stiff bureaucrat working for the more visibly malicious Dounami. Except its because he's a stiff bureaucrat that he can actually manage to make conditions worse for kaijin and immigrants, enacting new discrimination policies with surprising speed. His active interest in using the kaijin as weapons, a ploy Dounami considered unnecessary in the modern world, also brings him far closer to Michinosuke's kind of politician than Shinichi's. By all accounts, people like Nimura are probably the only reason Dounami's government was even functioning under his laid-back rule.
Obstructive Bureaucrat: His role is to essentially manage all the actual political work to ensure Dounami's petty wants and demands are accounted for.
Pragmatic Villainy: While he does implement the same policies as Shinichi when ascending to the position of Prime Minister, unlike him, he has enough intelligence to implement them through subtler methods to avoid drawing attention from other countries.
Walking Spoiler: The fact that he has any story relevance beyond being a simple assistant exposes Dounami's fate.

Characters / Kamen Rider BLACK SUN