History Literature / TheHeroesOfOlympus

* TheLastOfTheseIsNotLikeTheOthers:
-->The coffee shops were doing a brisk business, and street musicians filled the air with the sounds of guitar, lyre, panpipes, and armpit noises.

** Jason and Thalia's mother, Beryl Grace, was an unstable alcoholic who sacrificed her son to a goddess to save her own skin.
** Reyna's father, who suffered from PTSD and his love of Bellona began to make him go off the deep end.
** Leo ran away from 6 foster homes and states that at least one was abusive.
* AdultsAreUseless: The seven half-bloods destined to save the world are all below the age of eighteen. The gods are [=AWOL=] and those that aren't can't actively lend a hand.

** Jason and Thalia's mother, was an unstable alcoholic.
** Queen Marie, Hazel's mother, actively (if unintentionally) cursed her daughter and resented Hazel for it when bad stuff started happening.

* AllGirlsWantBadBoys: Lampooned with Narcissus's nymphs when Leo plays a straight-up parody of the bad-boy archetype to distract them. Team Leo!

** This used to be the case for Leo, as the "seventh wheel" among three couples. [[spoiler:Not anymore, as of ''The House of Hades'', as he hooks up with Calypso.]]

* AmazonBrigade: The actual Amazons show up in Seattle.

* AndNowForSomeoneCompletelyDifferent: After five books focusing on Percy Jackson and his friends, ''The Lost Hero'' starts with Jason, Piper, and Leo, who are only being indoctrinated as Greek demigods. Percy appears in the next book, however.

-->'''Annabeth''': The Olympian gods are already hard to imagine as parents, but at least they resemble humans, while the primordial gods like Gaea and Tartarus...How can you leave home, become independent and live separately from your parents, when they ''literally'' own the entire world?

* RepeatedCueTardyResponse: In ''The Mark of Athena'':
-->'''Percy:''' Save yourselves! It is too late for us!" ''[gasps and points to the spot where Frank is hiding]'' "Oh, no! Frank is turning into a crazy dolphin!"\\

'''Frank:''' "[[BadBadActing Oh, no. I am turning into a crazy dolphin.]]"

* RepeatedCueTardyResponse:
-->“Save yourselves!” Percy warned. “It is too late for us!” Then he gasped and pointed to the spot where Frank was hiding. “Oh, no! Frank is turning into a crazy dolphin!”\\
Nothing happened.\\
“I said,” Percy repeated, “Frank is turning into a crazy dolphin!”\\
Frank stumbled out of nowhere, making a big show of grabbing his throat. “Oh, no,” he said, like he was reading from a teleprompter. “I am turning into a crazy dolphin.”

* AffablyEvil: All the Giants are actually rather charming in their own twisted ways. [[spoiler: Ephialtes and Otis especially... that is, until their spectacle is ruined.]]

** This used to be the case for Leo, as the "seventh wheel" among three couples. [[spoiler: Not anymore, as of ''The House of Hades'', as he hooks up with Calypso.]]

* {{Animorphism}}: [[spoiler: The Zhang family]] have the ability to shapeshift into different animals as a hereditary gift.

** As mentioned in the previous series, Percy is not above prioritizing his loved ones over the fate of the world. It's blatantly stated that this will come into play later, and it will be up to [[spoiler: Frank]] to help him stick to his duty.

* ArtShift: The covers of the first two books. Probably deliberate, to accentuate the more culturally refined nature of the Greeks (featured in [[http://3.bp.blogspot.com/_DBkee5OgTYc/TB6Wc1InFpI/AAAAAAAABCA/xAePhaAzyGs/s1600/The_Lost_Hero_FINAL.JPG ''The Lost Hero'']]) verses the rougher, grittier [[spoiler: Romans]] (featured in [[http://1.bp.blogspot.com/-9QkM-He0xxU/Td5GLWHnq6I/AAAAAAAABQE/e1I6_B_8bF4/s1600/Son%2Bof%2BNeptune%2BFinal%2BJacket.jpg ''The Son of Neptune'']]).

** Hylla, Circe's assisstant, last seen in ''Sea of Monsters'' turns up again as [[spoiler: Reyna's sister and queen of the Amazons]].

** A lot of people, Greek and Roman, did ''not'' feel bad when [[spoiler: Octavian got himself launched by a flaming catapult and died. Not even his most loyal bodyguard bothered to warn him that his toga was snagged.]]

** This is still in full effect for [[spoiler: General Tyson of the Cyclops Army]] too.

* BackForTheDead: ''The Blood of Olympus'' sees the brief return of [[spoiler: The Hunters of Artemis and Hylla's Amazon warriors, only to see a number of them slaughtered by Orion. Hylla and Thalia survive, but Phoebe and Kinzie do not.]]

** Percy does this casually for himself and Annabeth in ''The Demigod Diaries''. [[spoiler: It fails hilariously.]]

** Not during a fight like most boasts, but this still deserves mention. When Hazel, youngest of the heroes, makes this declaration to Hecate, goddess of magic and crossroads: "We’re going to find a way to stop Gaea. We’re going to [[spoiler: rescue our friends from Tartarus.]] We’re going to keep the crew and ship together, and we’re going to stop Camp Jupiter and Camp Half-Blood from going to war. We’re going to do it all." Hecate, for her part, is interested to see if Hazel and the others can actually do it, claiming it would be magic worth seeing.

** Annabeth pulls off a ''beautiful'' one in ''The Mark of Athena''; it takes real nerve to [[spoiler: talk your enemy into literally ''sticking her head into a trap'', and that's ''after'' getting her to make the trap in the first place]].

** Subverted with Leo, Frank, and Hazel, since Leo doesn't act on any feelings he has for Hazel, and Hazel isn't in love with Leo but rather with Frank. However, who is the Betty and who is the Veronica is more clear cut in this case. Frank is the Betty, since he and Hazel are best friends, he houses feelings for her, and he lacks self-confidence, while Leo is the Veronica, since he interferes in and complicates Hazel and Frank's relationship and is far more assured of himself than Frank is. By ''The House of Hades'', this triangle is effectively over, since [[spoiler: Leo has fallen in love with Calypso]]. All three of the characters comment on this new development.

** Percy, Frank, and Hazel [[spoiler: arrive at the nick of time during the invasion of New Rome, followed in short order by the Amazons]], who act as TheCavalry.

** Actually happens sometime after the conflict ends, but still. [[spoiler: Jason and Piper have this kind of kiss on the balcony of Cabin 1 (the largest cabin in Camp Half-Blood), alone, and under a sky full of stars. It's more meaningful in Piper's part, because to her, she already experienced it due to the Mist's effects, yet is heartbroken when she is told that that's a fraud. Jason honorably makes it up.]]

** Also [[spoiler: Leo and Calypso]], this time doubling with BeachKiss.

** Frank Zhang has to deal with ''both''. [[spoiler: His life force is tied to a stick, and if it burns down completely, he dies. However, the fire from the stick has been shown to be able to free Death himself; who knows what other awesome stuff it could do. Also, his animorphism could be considered one, since his life was linked to the stick specifically to balance the sheer awesomeness of said powers.]]

** For Leo, it's [[spoiler: his mom's death, as well as Festus dying.]]

* CatchAFallingStar: [[spoiler: Percy to Annabeth]] at the end of ''The Mark of Athena''.

* ChekhovsClassroom: The story of how the protogenia Ouranos lost his powers. It's been taught since at least the first book, yet the characters don't realize until much later that maybe, just maybe [[spoiler: it applies to other protogenoi, too]].

** And now Terminus. Seemingly a one-off gag, but then comes back in the climax [[spoiler: to help Percy defeat a Giant.]]

** Michael Varus starts out as mostly backstory explaining the loss of the legion's eagle, but [[spoiler: shows up on Ithaca in person as a spirit.]]

** After [[spoiler: leaving Calypso's island and learning about her history with Percy, Leo begins to resent the son of Poseidon for some time. Later, during a battle with Nike/Victoria, Percy tells Leo that he figured out what his problem was and admits that he still hates that he forgot about Calypso, saying that he's happy for Leo, and believes that the latter is better for her.]] Leo promptly gets steamed---not because he's still angry at Percy, but because [[TheAce Percy]] just humbled himself right in front of Leo and completely eliminated any justification that Leo still had for resenting him.

* {{Cliffhanger}}: Of the heart-wrenching kind. In ''The Mark of Athena'' [[spoiler: Percy deciding to fall into Tartarus with Annabeth]].

* CoolSword: Besides Percy's and Nico's cool swords from the last series, there's also Jason's Imperial Gold sword, which can also turn into a javelin- see SwissArmyWeapon. [[spoiler: Sadly, it broke during the fight with Enceladus.]]

** Also, Hazel and Frank against [[spoiler: Alcyoneus the giant.]] It wasn't a totally one-sided battle, but they really gave him a beatdown.
** Inverted in ''The House of Hades'', regarding [[spoiler: Tartarus]]. If anything, [[spoiler: Bob and Damasen's last stands]] are only really done to help Percy and Annabeth escape before [[spoiler: they get inevitably offed by Tartarus]], considering what happens to [[spoiler: Hyperion and Krios]] just a short while ago. To date, he's the only villain in the entire series whom the heroes are completely aghast and helpless in facing, not to mention being ultimately TheUnfought.
* {{Cyclops}}: Ma Gasket and her sons are cyclops. [[spoiler: Also, [[GentleGiant Tyson]]]].
* DarkerAndEdgier: Continuing the trend from the original series, featuring more cases of abuse, ParentalAbandonment, and {{Gayngst}}. ''The House of Hades'' definitely takes the cake out of all five books, though, as it features [[spoiler:the aforementioned internalized homophobia]] and the first villain that the heroes are unable to face and which requires at least two {{Heroic Sacrifice}}s: [[spoiler: Tartarus]].

** Piper thinks she'll have to betray her friends. [[spoiler: She doesn't]].
** Hazel is [[spoiler: directly responsible for Gaea bringing back Alcyoneus .]]
** Due to the time period in which he was raised, Nico sees his [[spoiler: sexuality and crush on Percy]] to be one.

** For the ''monsters'', which are regenerating within hours if not minutes because [[spoiler: Gaea made a new tunnel into Tartarus]].
** Eventually, even some demigods are able to come back from the dead without even realizing that they were dead. [[spoiler: Freeing Thanatos puts a stop to that]].

** Being from the past has some influence on Nico's [[spoiler: attitude towards his sexuality. He says later on that he would have accepted it in his own time, but having had a crush on the guy he blamed for his sister's death made him feel more guilty about his feelings than he might have otherwise. His angst about his sexuality seems to be only slightly influenced by the time he's from, but it is something he and Jason discuss in ''House of Hades.'']]

** In a more traditional example, [[spoiler: Jason in ''The Lost Hero'']], complete with some PleaseWakeUp beggings, courtesy of Piper. Of course, he gets better.
** [[spoiler: Leo -- however, the reader knows otherwise, and it is actually foreshadowed quite early, as the characters had planned to invoke this.]]

* DugTooDeep: [[InvokedTrope Invoked]]. [[spoiler: Gaea forces Hazel to use her powers to resurrect [[NighInvulnerability Alcyoneus]]]]. After [[MyGodWhatHaveIDone realizing this]], [[spoiler: Hazel decides to [[HeroicSacrifice bury herself]] [[TakingYouWithMe with the giant]] to postpone Gaea's plans]].

* EasyAmnesia: Zigzagged. Both Jason and Percy have their memories stolen by Hera/Juno, [[spoiler: but get them back a few days after joining the other camp of demigods. Jason joins the Greeks almost immediately after waking up with amnesia, but only gets most of his memories back at first. The rest take presumably months to return. Percy wakes up with and spends roughly two months with only the faintest memory of Annabeth and little else, but gets all of his memory back pretty much all at once. While this is appropriate, as Jason needed time to learn to trust the Greeks while Percy's FatalFlaw [[FridgeBrilliance allowed him to trust the Romans quickly]],]] YMMV as to whose amnesia was easier. [[spoiler:Percy's memories returning quickly was also partly caused by his drinking gorgon's blood.]]

* EmotionsVsStoicism: A running theme in Piper and Annabeth's friendship in ''The Blood of Olympus''-- the former is a daughter of the love goddess and trusts her natural instincts, while Annabeth, as a daughter of the goddess of wisdom, adheres to logic and strategy above all else. Comes to a head when they have to fight Mimas in the Temple of Fear, as [[spoiler: Annabeth is scared out of her wits trying to come up with a way to beat him and Piper has to constantly remind her to feel, not think]].

* EvilTakesANap: Throughout the books, [[NatureIsNotNice Gaea]] the BigBad is slowly beginning to wake from her slumber, but she's still conscious enough to influence events and cause a lot of trouble for the heroes even while asleep. [[spoiler: In the end, Gaea is finally defeated when [[CompellingVoice Piper manages to charmspeak her]] into going back to sleep forever]].

** When Reyna summons Percy to a private meeting with her in the principia, [[spoiler: he sits in the other praetor's chair while waiting for her]].
** ''The Mark of Athena'' brings up a few times the fact that [[spoiler: all children of Athena are afraid of spiders]].
** Leo joking about getting the House of Hades T-shirt. [[spoiler: Percy and Annabeth manage to get to the Doors of Death by acting like tourists.]]

** In Chapter 42 of ''The House of Hades'', Leo and Piper joke about [[spoiler: setting someone on fire to attack Gaea. In the next book, someone else is indeed set on fire to defeat Gaea.]]

** In their native home, the Hyperborean giants are peaceful. [[spoiler: Percy and Co. still use one to help them escape from some griffins.]]
** [[spoiler: Tyson also technically counts]], being a giant cyclops who is a kind ally of the heroes.
** [[spoiler: Damasen, as the opposite of Ares, is the most benevolent of the Giants]], but still stands huge like all his brothers

* GrievousHarmWithABody: [[spoiler: Percy defeats Polybotes by smashing his face in with Terminus' head.]]

* HarpingOnAboutHarpies: In ''The Son of Neptune''. However, Phineas [[spoiler: [[WhosLaughingNow is not]] having as much trouble with them anymore, basically turning his curse into theirs, with one exception. In order to get his help, the [[PowerTrio Power Trio]] has to capture the harpy [[OurMonstersAreDifferent Ella]], and give her to him]]. [[BatmanGambit This isn't exactly what happens]].

** Olympus has been closed and the gods have gone MIA. [[spoiler: Subverted. Even though Zeus ordered it, thinking it would lull Gaea back to sleep, several of the gods, thinking Zeus is making a mistake, have defied his orders. They had to do so covertly, however.]]

** Frank [[spoiler: taking charge of a ghostly Roman army in the House of Hades after an emergency promotion to freaking ''praetor''.]]

** [[spoiler: Leo Valdez]] at the end of ''The Blood Of Olympus'', [[spoiler:creating a massive explosion that kills himself while destroying Gaea. He gets better.]]

** The last child of Hephaestus that could create fire [[spoiler: before Leo]] was Thomas Faynor, who started the Great Fire of London in 1666.
** Frank's ancestor was blamed for the 1906 San Francisco Earthquake, [[spoiler: though it turns out he didn't do it.]]

* HoistByHisOwnPetard: [[spoiler: Octavian, and quite literally at that - in trying to kill Jason (though his motives were questionable seeing as he was just straight up insane by now), he kills ''himself'' when his clothes are stuck in the catapult he is trying to launch. Because of his actions and nature, nobody tries to stop him.]]

** Percy and Reyna after [[spoiler: they defeat the invasion and he gets promoted to praetor]].
** Everyone who's paired off by book three. [[spoiler: And by "Everyone" we mean "Everyone except Leo". Mostly.]]

** The entire group in ''The House of Hades'' [[spoiler: during an emergency shadow-travel trip.]]

* HumanPopsicle: Quite a few, from those in Boreas' fortress and [[spoiler: the Hunters for a short time during the battle at the Wolf House]]. Midas' "house guests" probably count, too.

** As well as Coach Hedge (a satyr) and Mellie (a wind spirit), [[spoiler: who are married and expecting a child by ''The House of Hades''.]]
** [[spoiler: Leo, a demigod, and Calypso, a titan]].
* InvisibleToNormals: The entrance to Camp Jupiter and New Rome can't be seen by {{muggle}}s.

* LiteralCliffhanger: The end of ''The Mark of Athena'' sees [[spoiler: Percy and Annabeth hanging from a ledge leading to Tartarus]].

** [[spoiler: Nico]] has been keeping the secret as well; Percy in particular is less than thrilled by this.

** Leo is descended from [[spoiler: Sammy Valdez, Hazel's boyfriend from back before World War II --specifically, he is Sammy's great-grandson.]]
** [[spoiler: Heracles and Chrysaor to Jason and Percy, respectively. They try to kill each other.]]

** LoveTriangle: Subverted. Frank-Hazel-Leo is set up as one, but it fizzles after they discover that [[spoiler: Leo is the great-grandson of Sammy, Hazel's old boyfriend]], and disappears altogether after [[spoiler: Leo meets and falls for Calypso]].

* MaybeEverAfter: The status of [[spoiler: Nico and Will's]] relationship by the end of ''The Blood of Olympus''.

** By the end of the series, [[spoiler: Leo and Calypso]].

** The series' epilogue also qualifies, because [[spoiler: Apollo's loss of foresight might meant the death of prophecies, and thus, [[EndOfAnEra the death of great adventures]]. Though read up [[Literature/TheTrialsOfApollo the next series]] for more clarification.]]
* OhCrap: [[spoiler: Alcyoneus after Frank and Hazel drag him into Canada. Polybotes when he realizes that Percy's got a god on his side.]]

** This means that Piper and Leo have the most time dedicated to them as narrators, and the epilogue of the series are narrated from their perspectives (incidentally, both are the main instruments leading to [[spoiler: Gaea's downfall]]).

* PoisonedChaliceSwitcheroo: Percy manages to pull this on [[spoiler: Phineas with the gorgon blood]]. He wins. Doubles as OutGambitted.

** "Twelfth legion. FULMINATA.” This then [[spoiler: shot out a thousand blasts of lightning that basically annihilated the Giants entire center line due to Percy's willpower.]] BAD ASS.

** Frank has a good one on [[spoiler: Alcyoneus]]:
---> '''Frank''': ''Welcome to Canada, idiot.''
** Percy gets an awesome one in on [[spoiler: Polybotes]].
---> '''Percy''': ''[[spoiler: I'd like you to meet my friend Terminus. He's a god!]]'' *thunk*

* RaceAgainstTheClock: Before solstice! Before the Feast of Fortuna! Before Nico suffocates! [[spoiler: Before Percy and Annabeth die to thousands of the worst monsters in history!]] Before the Feast of Spes!

* RedemptionEqualsDeath: [[spoiler: Octavian's last act is to fire one of the onagers, Roman catapults, at Gaea in order to destroy her. He's caught on it and is sent flying with the attack, dying with her. Admittedly, he was also trying to kill Jason at the same time, but he explicitly names Gaea as a target as well; this leads to his being remembered as a savior of Rome afterward.]]

* RummageFail: When facing off against [[spoiler: Lycaon]], a nervous Leo reaches into his [[BagOfHolding tool belt]] for a weapon and initially grabs breath mints before hastily swapping them for a hammer. He hopes no one noticed. This is turned into a BrickJoke ''seconds'' later when the perspective switches to Jason, and while evaluating his assets, he thinks about "Leo, who apparently thought he could defeat the armies of darkness with breath mints."

** Also keeps with the HistoryRepeats theme of the series, as [[spoiler: Hercules/Heracles was offered essentially the same choice.]]

*** Percy opts to [[spoiler: fall into Tartarus with Annabeth]], leaving Frank to hold the quest together, just as Mars predicted.
*** At the end, he and Annabeth are forced to [[spoiler: leave Bob and Damasen behind to fight off Tartarus and operate the Doors of Death while they escape.]]

** A major part of the series is rooted in the misconception that the Roman gods are merely Greek gods who were adopted and tweaked slightly by Roman perceptions, ignoring the fact that the two pantheons originated separately and only became conflated later. The Roman gods were known to have taken on wildly different attributes compared to the familiar Greek ones -- Jupiter was a stone on which oaths were sworn, Venus was a patron of vineyards, Mars an agricultural deity... This is also why there exist gods like Janus, who's explicitly a Roman creation with no Greek counterpart.
%%** In addition, The Son of Neptune makes Neptune out to be hated by the Romans, with the full extent of their navy being a little dinghy. This could not be further from the truth -- Neptune was one of the Romans' most revered gods, right up there with Mars and Jupiter.

* SaveYourDeity: Jason, Piper, and Leo have to [[spoiler: rescue Hera before the solstice.]]

** This is the reason why Leo is initially afraid of his [[PlayingWithFire fire powers]]: [[spoiler:when he was a kid, [[BigBad Gaia]] visited the workshop where he and his single mother were, with the firm intention of preventing Leo from becoming a powerful enemy; Leo used his powers to try and protect his mother, but lost control and started a fire, accidentally killing her instead. He still has his father, but since he's the god Hephaestus whom Leo only met at 15...]]
** [[spoiler: Hazel killed her mother and herself to stop Gaea from raising Alcyoneus back in 1942.]]
** [[spoiler: Reyna killed her and Hylla's father after his obsession with Bellona turned him into a Mania.]]
* SequelHook: It's not very obvious like the last time, though, because it doesn't involve any of the demigods [[spoiler: (who get HappilyEverAfter). Apollo's control over foresight does not return even after Gaea's defeat, which probably means no more prophecies. Furthermore, Zeus is ''angry'' at Apollo as the latter didn't tell him about the prophecy and promises a punishment for him.]] This segues right into ''Literature/TheTrialsOfApollo''.

** Percy and Reyna as well as Reyna and Jason. While she and Jason weren't a couple, Reyna is shown to be fond of him. It's also fairly common for praetors to become romantically involved. Then Jason disappears for eight months [[spoiler: and Percy becomes the new praetor]].
** [[spoiler: Nico and Will Solace]] get a couple moments of cute contact in ''The Blood of Olympus'' .

** Subverted. Hazel and Frank are afraid Percy has done this to get rid of [[spoiler: the Roman shades in Alcyoneus's lair]], but the readers know he's fine because his water gifts will protect him from the fall.

* ToHellAndBack: [[spoiler: Percy and Annabeth barely survive Tartarus in House Of Hades, which is more or less Super Hell.]]

* {{Touche}}: Gaia is grudgingly impressed by [[spoiler: Percy's gamble to force her to choose him over Phineas.]]

* UngratefulBastard: The Olympians in general tend to be this, making several characters wonder how they are better than the Titans or giants. Demigods do them favors and the best they get is "be grateful I do not kill you." In the last book, [[spoiler: Zeus continues this trend by being proud of Jason one moment, but nearly killing him for questioning him in front of the other gods the next.]]

* VoluntaryShapeshifting: All gods have the power to look like whatever they want. [[spoiler: All of Frank's family can shift into animals]].
* WalkIntoMordor: In ''The Son of Neptune,'' the heroes can't just fly to Alaska [[JustifiedTrope because Zeus would kill Percy if he tried it.]]

*** In ''The House of Hades'', [[spoiler: Jason promotes Frank to praetorship to lead the ghost army.]]
* WindowLove: Piper and her father [[spoiler: after he's lost his memory]] do this through a video chat, with their hands touching on "opposite sides" of the computer screen.

* WombLevel: Tartarus (the realm) is literally the body of Tartarus (the EldritchAbomination). When [[spoiler: Annabeth and Percy]] fall down there, they sometimes wonder what part of his body they're walking on.
%%TheWoobie was moved to the YMMV tab. Please don't move it back here.

** It comes into play with Hazel’s age as well. She celebrates her thirteenth birthday in December of [[spoiler: 1941]], and the next time we see her it’s summer in Alaska. Since she’s one of the names that Jason mentions at the end of ‘’The Lost Hero’’, she must have arrived at Camp Jupiter before he disappeared in September. ‘‘The Son of Neptune’’ takes place the following June, making her fourteen years old.

* YouAreWorthHell: The end of ''The Mark of Athena'' ends with one of these, with Percy [[spoiler: getting dragged down to Tartarus with Annabeth instead of just letting her go.]]
* YouShallNotPass: Percy initially intends to do this in ''The House of Hades'' so that Annabeth [[spoiler: can escape Tartarus]], but she [[SubvertedTrope rejects the suggestion out of hand]]. [[DoubleSubvertedTrope However]], [[spoiler:Bob and Damasen]] ultimately do this instead.

** [[spoiler: Leo - however, the reader knows otherwise, and it is actually foreshadowed quite early, as the characters had planned to invoke this.]]

** Apparently [[http://www.amazon.com Amazon.com]] is a front company for the [[http://en.wikipedia.org/wiki/Amazons actual Amazons]]. And they apparently read on their Kindles when they ought to be on guard duty (though it's less likely to be ProductPlacement than JustForPun).

** Jack London was a son of Mercury whose Wolf House burned down because it was built on sacred ground.

* ThreeAmigos: Jason, Leo, and Piper. Also Percy, Frank, and Hazel. [[spoiler: In the final book, we have Nico, Reyna, and Coach Hedge.]]

** [[spoiler: Damasen, as the opposite of Ares, is the most benvolent of the Giants]], but still stands huge like all his brothers
%% * GettingCrapPastThe Radar: Due to overwhelming and persistent misuse, GCPTR is on-page examples only until 01 June 2021. If you are reading this in the future, please check the trope page to make sure your example fits the current definition.

* AsskickingEqualsAuthority:

* FormerlyFat: Frank Zhang appears in the series as a big and pudgy teenager with a combination of bulky wrestler body and baby face that makes him look like a cuddly koala bear, a small sumo or a "baby-man" depending on who you ask. However comes ''The House of Hades'' and his father, [[WarGod Mars]], offers him his "blessing" which gives Frank a body [[GrowingMusclesSequence fitting a perfect Roman warrior]]: his chest becomes bulkier and his shoulders broaden, he grows three inches taller, his gut shrinks until his spare tire disappears, he becomes solid and strong until no one could call him "pudgy" or "cudly" anymore, his face becomes sturdier and more rugged (which makes him look older... As other people point out, he now looks like a football linebacker, or a bull of a young man.

* ArtisticLicenseLinguistics: In ''The House of Hades'', Piper suggests (and the others generally accept) that when the prophecy says ''"the world must fall"'' the "world" means the earth, and therefore in Greek means Gaea. Except the Greek word for world isn't "Gaea" (Γαῖα) or even the generic word for earth "ge" (γῆ). The most common translation "world" to Greek would be "kosmos" (κόσμος), which ''isn't'' a synonym for "earth"/"Gaea".

** Jason and Thalia's mother, who was an unstable alcoholic.

* AsLongAsThereIsEvil: Pointed out in chapter LXI of ''The House of Hades''. Percy notices that the [[TheLegionsOfHell great crowd of monsters]] he sees in Tartarus includes people that he fought before. No matter how many times he kills them, they will just regenerate and come back later -- a realization that fills Percy with dread and hopelessness. However, he realizes that even if monsters will keep on fighting, [[HeroicLineage so too will future generations of demigods]].

** Percy to Polybotes: "You. Me. To the finish."

** "We've got a dam hole." And this one is from the ''original series.''
** When Percy shows up again after falling off a giant cliff and Hazel and Frank are surprised, he mentions that he's fallen from higher, which was another reference to the first series.

* CampfireCharacterExploration: Because Leo is the son of Hephaestus, it allows for instant campfires; as such, this tropes occurs three times throughout the first book. However, the second two take place around the same campfire (right after a werewolf attack and with the addition of Thalia).
* CasualDangerDialog: A series staple. Special mention goes to Nico and Will Solace, who spend a significant chunk of the Roman invasion and battle with Gaea in ''The Blood of Olympus'' snarking at each other.

* CreatorProvincialism: A noticeable aversion in comparison to the first series. Instead of all America, all the time (with a few digs at UsefulNotes/{{Canada}}), ''Heroes of Olympus'' looks set to be much more international: a Chinese-Canadian main character (complete with an exceedingly rare tip of the hat to Canada's military) a book cover set against the Quebec City skyline, and a climactic moment in British Columbia, all in the first second books. And there's the quest whose end goal takes the characters to UsefulNotes/{{Greece}}, with pit stops including: UsefulNotes/{{Italy}}, UsefulNotes/{{Croatia}}, and UsefulNotes/{{Malta}}, and a return journey that includes UsefulNotes/{{Portugal}} and UsefulNotes/{{PuertoRico}}.

* DarkerAndEdgier: Continuing the trend from the original series, featuring more cases of abuse, ParentalAbandonment, and {{Gayngst}}. ''The House of Hades'' definitely takes the cake out of all five books, though, as it features [[spoiler:the aforementioned homosexuality]] and the first villain that the heroes are unable to face and which requires at least two {{Heroic Sacrifice}}s: [[spoiler: Tartarus]].

* HeroesUnlimited: Percy and Annabeth still play major roles, but new heroes Jason, Piper, Leo, Hazel, Frank, and Reyna all have similarly significant parts in the story. Nico, a returning character, is also upgraded to main character status.

** In the audiobook ''Son of Sobek'', Percy crosses paths with [[Literature/TheKaneChronicles Carter Kane]] while they are both hunting the titular giant crocodile, and they get into a fight when Percy mistakes Carter for a rogue demigod and Carter (who is half-African American and half-Caucasian) [[MistakenForRacist misunderstands the term "half-blood"]].

** Leo is related to [[spoiler: Sammy Valdez, Hazel's boyfriend from back before World War II --specifically, he is Sammy's great-grandson.]]

* NewPowersAsThePlotDemands: Justified -- the first book never delved into ''what'' powers the other godly parents could have passed on to their demigod children.

* PurpleIsPowerful: The demigods in Camp Jupiter wear purple shirts.

Has a [[https://tvtropes.org/pmwiki/crowner.php/BestEpisode/TheHeroesOfOlympus Best Installment Crowner]] now.

** Hazel's life gives off this vibe. Wherever she goes, cursed gems and gold emerge from the earth that could kill innocents who picked them up. Pluto seemed to imply that most of his children are like this to some extent, but Hazel just takes it UpToEleven.

* BagOfSpilling: In ''The Son of Neptune'', Percy loses most of his memories. He is still effectively invulnerable due to his Curse of Achilles [[ATasteOfPower and repeatedly defeats the gorgons]]. Soon after June tells him that for him to enter Camp Roman he must lose his Curse of Achilles, leaving him vulnerable to harm, and he chooses to enter.

* BrickJoke: Annabeth's mouth is hung open at the horror of seeing Tartarus. She compares her reaction to how Percy drools in his sleep, the very first thing she ever said to him.

** ''The House of Hades'' has this within the series. Without any training, Hazel can manipulate the Mist to do magic better than an immortal sorceress. Piper's own charmspeak and powers of love can now manipulate machines and have an effect on the physical world instead of only influencing people's behavior.
** Also, [[ArsonMurderAndJaywalking Riptide can suddenly be used as an actual pen.]]

* YouCantFightFate: Played with. As the first series established, prophecies become worse if you try to avoid them, but Zeus points out near the end of the fifth book that there is ''never'' a single right answer to fate. There are three Fates, and each enables a different path to be walked, with different results, different paths. So while you can't fight Fate, Fate is perfectly okay with letting you take your sweet time fulfilling it.

* IncestIsRelative: It is mentioned that unless you have the same godly parent, it isn't creepy for two demigods to have a relationship, despite the Olympians being largely related to eachother.