History Characters / TheHeroesOfOlympus

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%%Putting trope titles in spoilers is forbidden per Administrivia/HandlingSpoilers. If a trope is too spoilerrific, either pothole it in another %%trope entry or don't list it at all.
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%%Given the interconnected nature of the mythological series', could someone with the proper experience/authority merge this page with those from the Percy Jackson, Kane Chronicles, Trials of Apollo, and Magnus Chase series similar to the Star Wars character page?
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Characters who appear in ''Literature/TheHeroesOfOlympus''. For characters from ''Literature/PercyJacksonAndTheOlympians'' (and elaboration on tropes returning in recurring characters), check out [[Characters/PercyJacksonAndTheOlympians the previous series' character sheet]]. Note that spoilers from the previous series and several other spoilers may be unmarked.

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[[foldercontrol]]

!!The Seven

[[foldercontrol]]

[[folder:General]]
* AffirmativeActionGirl: Piper and Hazel, when previously Annabeth was the only female protagonist.
* AffirmativeActionLegacy: Percy, Annabeth, and Jason are white, Piper is Native American (specifically Cherokee), Frank is Chinese-Canadian, Hazel is black, and Leo is Latino. This is in contrast with the previous series when nearly all the characters were Caucasian.
* BattleCouple: Percy/Annabeth, Jason/Piper, and Frank/Hazel. Other characters note Leo's status as AloneAmongTheCouples.
* ChangingOfTheGuard: Percy and Annabeth are the only returning characters.
* ConvenientlyAnOrphan: Only Percy's, Annabeth's, and Piper's mortal parents are still around, and the latter two don't exactly [[ParentalNeglect have the best relationship with their dads.]]
* JustAKid: They are continuously dismissed by their adversaries with this trope.
* HumanMomNonhumanDad: Played straight with Percy, Frank, Hazel, Leo, and Jason, but inverted with Piper and Annabeth.
* RuleOfSeven: The Great Prophecy mentions seven demigods who will take on Gaea.
* TrueCompanions: Over the course of the series, they [[FireForgedFriends slowly, grudgingly]] grow into this. This is in full force by the end of the fourth book, where they'd willingly risk their lives for another member of TheTeam.
[[/folder]]

[[folder:Percy Jackson]]

!!Perseus "Percy" Jackson
-->''"Only a thousand times? Oh, good...I thought we were in trouble."''

Son of the Greek god Poseidon and Sally Jackson and protagonist of the previous series. Percy is one of two titular "lost heroes" for the first book, but he's back in the second, amnesiac and running from monsters. He is brought by Hera/Juno to the Roman Camp, Camp Jupiter, and realizes that his destiny is far beyond being the half-blood mentioned in the last Great Prophecy.

Having just gone through five books' worth of CharacterDevelopment and combat experience, Percy is more mature than he was in the previous series. He is also far more dangerous in combat, being an unpredictable, veritable OneManArmy. He easily befriends the rest of the Seven, despite a few clashes with fellow [[TheAce ace]] Jason. However, his FatalFlaw from the previous series -- [[UndyingLoyalty personal loyalty]] -- is still in play, with Mars mentioning that it would greatly hinder the Seven's quest to save the world.

As in the previous series, Percy's main weapons are Riptide, his Celestial Bronze sword (formerly owned by Hercules), and his ability to command [[MakingASplash water]] and all the ComboPlatterPowers that come with this (see below).

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* TheAce: At first, he was presented as this to both the new heroes, who either heard of his greatness (Piper, Jason, and Leo) or experienced his combat prowess firsthand (Frank, Hazel). Also on a meta level to the audience, who know of his five books' worth of CharacterDevelopment and [[TookALevelInBadass badassery increase]]. This is increasingly subverted as the books go on, however, especially in ''The House of Hades''.
* {{Ambadassador}}: He was [[LaserGuidedAmnesia memory-wiped]] and sent to Camp Jupiter as part of Hera's plan to get the rival camps to trust each other through an "exchange of leaders," trading places with Jason. He was chosen because of his power and general badassery.
* AmnesiaMissedASpot: He remembers only Annabeth, and only very dimly.
* AmnesiacHero: Along with Jason, as part of Hera's plan, he doesn't remember anything.
* AmnesiacLover: At the beginning of ''The Son of Neptune'', the only thing he remembers is Annabeth's name. He gets better.
* BadassBoast:
** Percy was rather fond of these during the first series, and the trait carries on here. Two particularly memorable ones during ''The Son of Neptune'' were:
** Percy to [[spoiler: Polybotes]], “You. Me. To the finish.”
-->'''Percy:''' Twelfth legion FULMINATA.
** The Twelfth Legion Eagle he was holding then shot out a thousand blasts of lightning that basically annihilated the Giants' entire center line due to Percy's willpower. BAD ASS.
* BadassInDistress: Gets taken from Camp Half-Blood and is missing for the entirety of ''The Lost Hero''.
* BabiesEverAfter: Doesn't actually happen, but he starts thinking about living in New Rome with Annabeth and having kids when he sees all the children running around.
* BatmanGambit: [[spoiler: Forces Gaea into helping him defeat Phineas, knowing that she considered him more useful than Phineas. It works.]]
* BattleCouple: With Annabeth, his girlfriend. [[spoiler: The fourth book pits the two of them against Tartarus, and they depend on each other to find their way out.]]
* BerserkButton: Betrayal. Even the ''insinuation'' that he (or his friends) could be traitors is enough to hit this. [[note]] This is a carryover from his FatalFlaw, UndyingLoyalty. [[/note]]
* BigBrotherInstinct[=/=]AFatherToHisMen: As in the original series, Percy understands how much more powerful he is than the average demigod, and he is entirely unafraid to use that power to take on entire ''armies'' to save his friends and allies.
* BigBrotherMentor: To Hazel and Frank, who are far more inexperienced than he is in ''Son of Neptune''.
* BigDamnHeroes: Riding to New Rome's rescue.
* TheBigGuy: Of the non-DumbMuscle variety. He is this to Hazel and Frank in ''Son of Neptune'', as the only seasoned veteran on the quest.
** Outright stated to be the most powerful of the Seven (now Eight) in ''The Mark of Athena''.
* BrokenAce: His guilt and insecurity about the price of reaching his current status come to a head in ''The House of Hades''.
* BroughtDownToBadass: In the ''Son Of Neptune'', he loses the “Curse Of Achilles”. This doesn’t stop him from being a Grade A asskicker and having all his abilities as son of Poseidon under his belt.
* BunnyEarsLawyer: Spends a lot of time cracking weird jokes (especially puns) but proves he's still an insanely powerful demigod and warrior. Both Hazel and Piper admit his apparent goofiness misled them.
%%TheCallKnowsWhereYouLive
* TheCape: He's the most powerful demigod of the modern world, TheHeart of the Seven and the de facto leader of any group of demigods he winds up with. In the followup crossover story with TheKaneChronicles ''The Crown of Ptolemy'' he's the only hero of the four that BigBad Setne [[EvilCannotComprehendGood can't find something to tempt with]].
* CasualDangerDialogue: He's very casual with his opponents, even if they're ''giants''.
* DeadpanSnarker: Whenever an opportunity for snark comes up, he takes it.
* DeathGlare: [[InvokedTrope Invoked]] by Percy in ''Son of Neptune'' -- he uses a "wolf stare" he learned from Lupa to stare people down.
* DidYouJustFlipOffCthulhu: He mouthed off to Jupiter and got away with it.
* DemonicPossession: Briefly in the third book at the hands of the eilodons.
* EvenTheGuysWantHim: It's revealed in ''The House of Hades'' that [[spoiler:Nico had a crush on him.]]
* FieldPromotion: Percy's promotion to praetor, making him a BadassInCharge.
* FightMagnet: As are all Demigods, though being the son of one of the Big Three, the monsters are attracted to him more than most.
* FigureItOutYourself: When searching for Camp Jupiter, Lupa can't tell him where he's going -- he has to find and get there himself.
* FlatWhat: This is the most he can manage when Nico [[spoiler: Confesses he [[HoYay once had a crush on him]], then had gotten over said crush in the same breath before blitheley walking away as if he only told Percy what the next day's weather would be]].
* TheHeart: What Hera/Juno intends him to be for the Seven. The tired phrase about being glue even gets brought up. In ''The House of Hades'', the effects of him not being there are clearly felt among the other characters.
* HeroicBSOD: When Chrysaor curbstomps him, he falls into a bit of a funk.
* HistoryRepeats: As in the previous series, Percy's deeds are mirroring those of Herakles, Odysseus, and other mythical heroes.
* HomelessHero: Searching for the Roman camp at the start of ''Son of Neptune''.
* HurtingHero: Accentuated best in ''Mark of Athena'' and ''Blood of Olympus''-being the go-to guy to save the world twice in a row has its prices, namely PTSD, guilt, and extreme fear of failure.
--> "Percy didn't feel powerful. The more heroic stuff he did, the more he realized how limited he was. He felt like a fraud. ''I'm not as great as you think'', he wanted to warn his friends. His failures, like tonight, Maybe that's why he had started to fear suffocation. It wasn't so much drowning in the earth or the sea, but the feeling that he was sinking into too many expectations, literally getting in over his head."
* HumbleHero: Despite saving the world less than a year previous, he doesn't make a big deal out of it. This is especially highlighted when he's described from other perspectives: Hazel, Leo, Reyna and Frank view him as intimidating and badass, which is pretty jarring considering his own point of view is usually just casual snark and making everything up as he goes along. They all lampshade the fact that he downplays his heroism.
* IdiotBall: When Percy forgets the supplies back in the boat and has to go back for them, allowing the karpoi grain demon things to kidnap Hazel. He even lampshades it.
* IndyPloy: His preferred combat strategy is making things up as he goes along, in stark contrast to[[TheStrategist Annabeth]].
* InvincibleHero: Has shades of this, even ''after'' losing the Curse of Achilles. He's so powerful that ''Chrysaor'' is the only person able to go toe-to-toe with him under normal circumstances. [[spoiler:Subverted the further he and Annabeth go into Tartarus, where the stakes just get higher and higher and the opponents get more and more powerful. The ONLY reason they survive is that they have a Titan AND a Giant to help them out.]]
* IronicFear: Struggles with a fear of drowning in ''The Mark of Athena''.
* LaserGuidedAmnesia: In the first book, he can't remember anything except Annabeth's name.
* LegendaryInTheSequel: Gets a bit of this in ''The Lost Hero'' as he doesn't appear but the new characters hear a lot about him from Annabeth and the rest of Camp Half-Blood. (Afterwards he's too busy battling new enemies for anyone to focus on his previous victories). Lampshaded when Piper meets him and doesn't find him as legendary as she expected.
--> Piper: "After hearing so much at Camp Half-Blood about Percy Jackson ''this'' and Percy Jackson ''that'', she thought he looked well....unimpressive."
* LetsYouAndHimFight: Against Jason while under DemonicPossession.
* LightningBruiser: Fast, strong and agile enough to shatter a ''Roman military formation comprised of other demigods.'' And all that's ''without'' water, which only magnifies these traits.
* LikeBrotherAndSister: With Hazel in ''Son of Neptune''. He views her as a little sister.
* LivingEmotionalCrutch: To Annabeth. Finding him is her motivation throughout the first book. Taken to the extreme when both of them are [[spoiler: stuck in Tartarus]], having only each other to depend on physically, mentally, and emotionally.
* MagneticHero: Why Juno picks him as one of the seven. He is unfailingly loyal and inspires loyalty in others.
* NamesToRunAwayFromReallyFast: An anti-hero example; his name means "the destroyer". Thanks to being FamedInStory, he has the fear or respect of most people he meets, and [[KidHeroAllGrownUp boy,]] [[FromNobodyToNightmare has he]] [[PersonOfMassDestruction earned it.]]
* NiceGuy: He's all-around a pleasant, supportive, patient, loyal person. [[spoiler: Confesses to feeling guilty of, among other things, trying to drown a goddess in poison who had it coming and not checking to make sure the Olympians had freed Calypso, despite spending the majority of his time after the events of the first series ''in a magically-induced coma and unable to actually do that.'']]
* ObfuscatingStupidity: Percy is smart, it's just that his recklessness and impulsiveness overshadow this, making him look dumb.
* ObliviousToLove: [[spoiler:As of ''The House of Hades'', he's completely unaware of Nico's feelings for him]]. It takes him a few moments to catch on to the meaning of Reyna's words to him in ''Son of Neptune'', in which she basically offers becoming a RulingCouple with her.
* OfficialCouple: With Annabeth.
* OneManArmy: Percy + [[MakingASplash Water]] = [[PersonOfMassDestruction Unstoppable Machine of Destruction]]
* OutOfFocus: In ''The Lost Hero'' [[spoiler:and ''The Blood of Olympus.'' He's still present and important in the latter, but Percy and Annabeth have no chapters narrated from their point of view, likely due to their prominence in ''The House of Hades.'' Instead, Nico and Reyna get ADayInTheLimelight.]]
* PreAsskickingOneLiner: See BadassBoast.
* PuppyDogEyes: According Piper he looks like a baby seal when he's pleading for something, making her wonder how Annabeth ever won an argument with him.
* PursuedProtagonist: On the run from monsters right in his first chapter of ''The Son of Neptune''.
* QuestForIdentity: In ''Son of Neptune'', he attempts to remember who he was before being memory-wiped while trying to stay alive.
* ReunionKiss: With Annabeth in ''The Mark of Athena''. And then she judo-flips him.
* SealedGoodInACan: Juno kept him asleep for several months between the first and second books. Percy was ''not'' happy about it.
* ShipperOnDeck: For Frank/Hazel.
%%SleepCute
* SpotlightStealingSquad: Percy is [[spoiler:raised to praetor]] after fewer than 24 hours total at Camp Jupiter.
* SternChase: Percy is running from Gorgons immediately prior to ''Son of Neptune''.
* TallDarkAndHandsome: Dark-haired, with the good looks of a Roman god.[[note]]He's an inch shorter than Jason, who clocks in at 6'1".[[/note]].
* TeamDad: Shaping up to be like this, since he isn't the official leader of the quests he's going on. Also part of the reason Hera actually ''wants'' him on the quest.
* ToHellAndBack: [[spoiler: Is sucked into Tartarus with Annabeth. This is the majority of their role in ''The House of Hades''.]]
* TookALevelInBadass: Apparently he learned the Pokemon move [[DeathGlare Glare]] while [[RaisedByWolves hanging out with Lupa]].
* TwoRoadsBeforeYou: A happy life under the sea, or misery and world-saving.
* UndyingLoyalty: His FatalFlaw from the previous series appears, downplayed, in the third and fourth books: [[spoiler:He falls into Tartarus with Annabeth instead of letting her fall by herself. Later, when someone has to hold the elevator button for the Doors of Death and Bob is too incapacitated trying to save his and Annabeth's asses, Percy tries to get Annabeth to go on without him so he can at least die with Bob.]] Annabeth is having none of it. [[spoiler: This trait is so prevalent that the gods and even his fellow demigods had a very real fear that Percy would absolutely refuse to let any of them make a sacrificial call, even if the quest failed and the world was destroyed because of it. In the end, Frank convinced him not to do this.]]
* WorfHadTheFlu: He is the most powerful of the Seven. The only person who can take him in a straight fight in the entire series is Chrysaor, and he is a son of Poseidon himself.
* WhyDidItHaveToBeSnakes: Or rather, airplanes. In ''Son of Neptune'', Percy quickly decides he would rather be driving or running from Laistrygonians and heading towards Alaska on the ground, than flying far out of their reach in an airplane. Not that he has much choice in the matter. This is carried over from the previous series, where Percy doesn't want to ride on planes because Zeus might smite him, as a son of Poseidon, for moving in his domain.
* YouAreWorthHell: [[spoiler: Chooses to fall into Tartarus with Annabeth rather than lose her again.]]
-->'''Percy:''' We're staying together. You're not getting away from me. Never again.
[[/folder]]

[[folder:Annabeth Chase]]

!!Annabeth Chase

-->''"The first lesson every child of Athena learned: Mom was the best at everything, and you should never, ever suggest otherwise."''

Daughter of Athena and Frederick Chase and heroine of the last series. Following Percy's disappearance prior to the series, Annabeth struggles to balance searching for him, being head counselor of the Athena cabin, holding the rest of Camp Half-Blood together, and undertaking the task presented to her in the previous series of redesigning Olympus. As such, she's mostly out of the picture for the first two books beyond briefly mentoring our new protagonists, but returns in the third, with a divine quest from her mother on her hands -- to find the Athena Parthenos and return it to the gods, at whatever cost.

Annabeth is stern and strict, but ultimately deeply caring and loyal. As one of the most experienced on the team, she serves as an adviser and CoolBigSis to the more inexperienced heroes, as well as TheLeader and mastermind of all of the Seven.

As a child of Athena, Annabeth is gifted with divine intellect and a natural talent towards strategy. Despite not having any superpowers useful in battle, she is still a competent warrior, fighting with the Celestial Bronze knife given to her by Luke Castellan prior to the previous series.

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* AcademicAthlete: Spends ninety percent of her time either designing buildings for Olympus, being a straight-A student, or fighting tons of Greek monsters.
* ActionGirl: Even with no special powers other than her wits to aid her, Annabeth is quite the terror with a dagger.
* AwesomenessByAnalysis: Outwits the ghosts of Mithras's followers just by making observations about the information about their worship decorating the cavern walls.
* BadassBookworm: As a daughter of Athena, she loves knowledge, and is frequently seen with some sort of reading material.
* BattleCouple: With Percy.
* BadassFamily: Her mom is the Greek goddess of strategy (a subset of war), her dad is willing to fly in on a biplane to gun down monsters trying to hurt his daughter, her cousin [[MagnusChaseAndTheGodsOfAsgard Magnus]] is [[spoiler:the demigod son of the Norse god of kingship, sunlight, and summer as well as an Einherji, a formerly dead hero who has been granted various physical boons and ResurrectiveImmortality in Valhalla]], on top of having the most prominent son of Poseidon in the modern era as her boyfriend.
* BeautyIsNeverTarnished: Despite all the hell they go through in the fourth book, Percy continuously describes her as beautiful, though this could be justified by his bias because of being her boyfriend.
* ChekhovsSkill (or ChekhovsClassroom): The Chinese fingertrap, which she teaches Frank, and [[spoiler: is later used in her fight against Arachne]].
* CoolBigSis: To Piper, being the older and more experienced Greek demigod. To Frank as well, in ''The House of Hades'' he remembers her being kind, helpful, and patient towards him. As the second best strategist on the team, he looks up to her.
* CoolSword: [[spoiler:Gets a sword made from a drakon's bone in ''The House of Hades'' after she loses her knife.]]
* {{Determinator}}: Annabeth never gives up.
* FriendlyEnemy: With Reyna, as seen in their conversation in ''The Mark of Athena'' -- despite being on opposing teams, they view each other as equals and clearly respect each other.
* GuileHero: Uses nothing but her wits and a modified ScheherezadeGambit against a giant spider.
* GotVolunteered: For the quest to search for the Athena Parthenos, with no chance to say no to mom.
* IWillFindYou: In ''The Lost Hero'', the reason she's mostly OutOfFocus is because she's searching for Percy.
* KnifeNut: Still uses the knife Luke gave her. [[spoiler:She loses it in Tartarus, much to her chagrin, but gets a CoolSword instead.]]
* TheLeader: Is established as this when the seven heroes finally unite in Mark Of Athena.
* LivingEmotionalCrutch: To Percy. Finding him is her motivation throughout the first book. Taken to the extreme when both of them are [[spoiler: stuck in Tartarus]], having only each other to depend on physically, mentally, and emotionally.
* NeatFreak: She keeps the Athena cabin spotless.
* OfficialCouple: With Percy.
* OutOfFocus: In the first two books, since she's not part of the PowerTrio in either one (Jason, Piper, and Leo in the first, and Percy, Hazel, and Frank in the second). Averted in the third, where she provides one of the four viewpoints, [[spoiler: and who's subplot gives the third book its name. Again in ''The Blood of Olympus.'' She's still present and important, but Percy and Annabeth have no chapters narrated from their point of view, likely due to their prominence in ''The House of Hades.'' Instead, Nico and Reyna get ADayInTheLimelight.]]
* RedHerring: [[spoiler:In ''The House of Hades'', the reader is initially led to believe that she's the one Nico has a crush on. Then when Cupid shows up, it turns out to be Percy, not her.]]
* ReunionKiss: With Percy, and in front of a huge crowd of potential enemy forces, no less. Quickly turned into an emotionally-charged judo-flip into the stone pavement, but her boyfriend takes it in stride. He missed her too, after all.
* RevengeByProxy: Is Minerva's proxy against the Romans.
* ScheherezadeGambit: Plays this against [[spoiler:Arachne]] when trapped with her. It works.
* SleepCute: With Percy in ''The Mark of Athena''.
* TheSmartGirl: Most of the time to a fault. She was trusted with Daedalus's laptop and spent long hours engrossed in it while aboard the ''Argo II''.
* TheStrategist: Athena is the goddess of war strategy, so all her children are good with tactics, and Annabeth especially so. Her plans have a way of coming together.
* ToHellAndBack: Is sucked into Tartarus with Percy. They get back out by walking through hell, as well as fighting him
* TheUnfavorite: Gets rejected by Athena (and her hat loses its magic!),or rather Minerva, after trying to speak up for working with Rome.
* ViolentlyProtectiveGirlfriend: For Percy. Her first appearance in the series is almost attacking Jason because she thinks he knows where Percy's gone. Jason is quite reasonably terrified.
* WhyDidItHaveToBeSnakes: Spiders, though she still manages to defeat Arachne.
** Also toward the Cyclopes in [[spoiler:Tartarus]].
* YouAreWorthHell: Percy could've saved himself if he'd let her fall, but accompanies her into Tartarus anyway. She's painfully aware of this in ''The House of Hades'', and briefly thinks that if he died, it would be her fault.
[[/folder]]

[[folder:Jason Grace]]

!!Jason Grace

-->"''I’m the son of Jupiter! I’m a child of Rome, consul to demigods, praetor of the First Legion. I slew the Trojan sea monster, I topped the black throne of Kronos, and destroyed the Titan Krios with my own hands. And now I’m going to to destroy you, Porphyrion, and feed you to your own wolves.''"

Jason is the first protagonist introduced in ''The Lost Hero'', on a school bus with his friend Leo and girlfriend Piper -- except he doesn't remember either of them, or anything, really. Some mishaps later, in which Jason reveals himself to be a good fighter despite not remembering anything, Gleeson Hedge, Annabeth, and Butch successfully deliver the three of them to Camp Half-Blood, with the revelation that the three of them are demigods.

Jason is claimed by Zeus, and leads a quest to rescue the goddess Hera. Along the way it's revealed that he's the younger brother to Thalia Grace, now leader of the Hunters of Artemis, and is actually the son of ''Jupiter'', Zeus's Roman aspect (which explains the Latin and the Imperial Gold weapon). And most importantly, he learns that he's Hera's Roman representative to the Greek camp -- like Percy is the Greek representative to the Roman camp, of which Jason was former praetor of.

Having been raised Roman, Jason is serious and a natural leader, although he does have his moments of good humor. However, he does struggle with the pressure of leading sometimes, being very critical of himself every time he makes a mistake. Over the course of the series he becomes less aloof, more willing to open up, and being more comfortable with himself and others.

As the son of Jupiter, he's blessed with the powers you'd expect the son of the lord of the sky to have -- he can control wind (and can fly as a result of this) and lightning (as well as the weather if he tries hard enough). He fights with Ivlivs, an Imperial gold coin that can change into a sword or a spear depending on which face it lands on, and later gains a gladius formerly owned by Hera at the end of the first book.

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* TheAce: Hazel refers to him as Camp Jupiter's "golden boy."
* {{Ambadassador}}: He was switched with Percy, [[LaserGuidedAmnesia memory-wiped]], and sent to Camp Half-Blood as part of Hera's plan to get the rival camps to trust each other through an "exchange of leaders."
* AmnesiacHero: Got memory-jacked by Juno in order to set up a huge scheme to get the two camps cooperating. Half his motivation to help Camp Half-Blood was to find Hera and get his memories back.
* AmnesiacLover: Averted. Jason quickly reciprocates Piper's feelings, but he doesn't want to lead her on when he isn't entirely sure how he feels about her (first because of his amnesia, then because it turns out they were never dating in the first place, and ''then'' because of Reyna). As of the first chapter of ''Mark of Athena'', he seems to have gotten together with Piper in the time between ''The Lost Hero'' and ''The Son of Neptune''.
* BigBrotherInstinct: When he finds out that Nico [[spoiler: had/has a crush on Percy, he takes it upon himself to defend the kid whenever another group member gives him a hard time or says anything derogatory about him.]]
** Also his reaction when the group reunites with Leo midway through the fourth book: Jason immediately realizes that something is wrong with his friend and asks if he's alright.
* BlowYouAway: His dad's powers give him the ability to control wind.
* BrokenAce: In ''The House Of Hades''. He's very hard on himself and can find it difficult to connect to people, but he's getting there.
* CharacterDevelopment: In ''The House of Hades'', he develops a BigBrotherInstinct toward Nico and Leo, and [[spoiler:realizes he may not truly belong at Camp Jupiter.]]
* TheChosenOne: The person who Annabeth would find missing a shoe from a prophecy turned out to be Jason, not Percy.
* CloseCallHaircut: Sciron shoots some of his hair off as a display of his prowess. With a Flintlock.
* CoolSword: Jason primarily fights with a coin that can turn into either a sword or [[BladeOnAStick a spear]] depending on which side it lands on.
* DemonicPossession: Possessed by an eidolon for a short while in the third book.
* {{Deuteragonist}}: To Percy's protagonist.
* TheDitherer: Not in general, but after his experience with Camp Half-Blood he was more-or-less, as stated several times, 'an aimless wind' - he didn't know exactly what he wanted to be - Greek or Roman - or exactly what he wanted to do with his life, and he usually tried to please everyone as a leader. Part of his CharacterDevelopment across the books is learning to make choices on those fronts.
* EasyAmnesia[=/=]LaserGuidedAmnesia: Memory-wiped by Hera as part of her plan to unite the Greeks and Romans.
* {{Foil}}:
** To Percy. They're both TheAce and natural leaders, but Jason is comparatively straight-laced and rigid where Percy is free-spirited rebellious thanks to their different camps and godly parents. They even look very different, with green-eyed, dark-haired Percy and blond-haired, blue-eyed Jason.
*** Even their ''names'' contrast. Perseus means "to destroy", whereas Jason means "healer".
** BromanticFoil: To Leo, see his entry below.
* GoodScarsEvilScars: Has a little one on his lip from trying to eat a stapler when he was two.
%%HairOfGoldHeartOfGold
* HeroOfAnotherStory: He was the champion of Rome during the Titan Wars and probably had gone on many epic adventures as Percy and Co. did. Unfortunately, this makes Jason something of an InformedAbility hero.
%%HisStoryRepeatsItself
* HumanMomNonhumanDad: His mother is described in the original series as an eighties starlet with a poofy hairdo. His father, of course, is Jupiter.
* {{Hunk}}: His handsome face and muscular body are given much attention (usually by Piper).
* IAmWho: Part of his QuestForIdentity in the first book.
* IcyBlueEyes: They represent his aloofness, at least initially. The text describes them as so several times. Also, they're the only thing he has in common with his sister.
* IronicName: In the sense that his name is derived from Greek (Iason = healer) and he's a Roman.
* LetsYouAndHimFight: [[spoiler: Against Percy by DemonicPossession.]]
* LightningCanDoAnything: Normally he ricochets it off his sword or javelin at the intended target. Sometimes works too well, since Achelous took this card off the table, as zapping him in the river would also have meant frying Piper.
* LongLostRelative: To Thalia, his older sister. He disappeared when he was two, and they don't meet again until the events of ''The Lost Hero''.
* MeaningfulName: Yes, just like [[Myth/GreekMythology ''that'']] Jason.
* MysteriousPast: In the first book. A new kid who calls all the gods by their Roman names, has a weapon that can slay monsters that's gold instead of bronze, knows how to fight ''really'' well and has a strange Roman motto with tick marks burned into his arm? Yeah, something's off.
* NewTransferStudent: Jason is technically one at the Wilderness School. The Mist creates fake memories for everybody so they think he'd been there for months already.
* NiceGuy: Doesn't ever get mad when things don't go his way. Being positive comes naturally to him.
* OfficialCouple: With Piper.
* OnlyFriend: Is this for [[spoiler: Nico]] in ''The House of Hades'', much to [[spoiler: Nico's]] annoyance. He is the Bob-2 to [[spoiler: Nico's]] Alice-1.
* RaisedByWolves: Literally. He was raised by Lupa, a wolf who trains Roman heroes.
* RedOniBlueOni: The Blue to both Leo and Percy's Red.
* RememberTheNewGuy: Thalia didn't mention having a brother during the previous quintet -- however, it's justified in ''The Lost Hero'' that his disappearance not only would have put the Roman-Greek split in jeopardy, but was ''quite'' traumatic for Thalia.
* SecretKeeper: [[spoiler:As of ''The House of Hades'', he's the only person other than Nico himself to know about Nico's crush on Percy.]]
* ShockAndAwe: Having lightning powers, while draining, is definitely an impressive trump card.
%%StandardizedLeader
* StraightMan: Because of his seriousness, he's quite deadpan.
* StraightManAndWiseGuy: With Leo.
* TheStoic: He's been a leader since he was young, and since his temperament sets the mood for his followers, he can't afford to get emotional. It's hardwired into him.
* TeamDad: Acts as TheLeader of the group due to his Roman upbringing being stricter than that of the Greeks', and in the third and fourth books tries to act as this for everyone else.
* TellMeAboutMyFather: He asks Thalia to tell him about their mother. He isn't very happy with what he hears.
* YouCantGoHomeAgain: [[spoiler: Even the undead legions in Epirus recognize his subconscious desire to stay at Camp Half-Blood, and thus refuse to recognize him as a praetor. He realizes it himself.]]
* WreckedWeapon: Destroyed during the fight with Enceladus.

[[/folder]]

[[folder:Piper [=McLean=]]]

!!Piper [=McLean=]

-->''"Being a hero doesn't mean you're invincible; it means you're brave enough to stand up and do what's needed."''

Piper is the beauteous daughter of Aphrodite and A-list actor Tristan [=McLean=]. Her dad's job being what it is, she doesn't get to spend much time with him, much to both their chagrin. She also doesn't have plenty of friends at school due to being a CoolLoser, and takes solace in Jason and Leo's company. She's understandably very shocked that she, Jason, and Leo only thought they were friends due to the Mist tricking them into thinking they were. Upon arriving at Camp Half-Blood Piper is claimed by her mother and immediately clashes with resident AlphaBitch and Silena Beauregard's successor, counselor Drew Tanaka. She despises fashion magazines, skirts, makeup, and other stereotypically girly characteristics shared by her siblings, leading her to feel out of place.

Because of her lonely background, Piper is fiercely protective of those close to her, and is very possessive over Jason. She's also insecure about their relationship and her standing among the Seven. However, Piper is willing to stand up to those who mistreat others, and is more than willing to stick her neck out for the rest of the team. She also displays remarkable empathy and is good at reading people. She slowly grows more confident in herself and in her powers over the course of the series.

Piper wields Katoptris, a ceremonial dagger once held by Helen of Troy. It shows her visions of the future and occasionally possibilities. As a daughter of Aphrodite, Piper is not that great in a fight -- however, she's also blessed with the very rare power of charmspeaking, which allows her to command people to do what she wants through her CompellingVoice. More than once, this is extremely useful to our heroes.

----
* ActionGirl: She certainly doesn't start out as one, but becomes a ''bona fide'' ActionGirl able to take on ''giants'' by the last book thanks to a combination of luck, raw talent, and swordfighting lessons from Hazel. Her only power is charmspeaking, but its powerful enough to daze enemies, knock people asleep, or reverse a tree's growth. And with her dagger? The giant she saved Leo from won't be messing with anyone soon.
* AffirmativeActionLegacy: Native American. Specifically, Cherokee.
* BeautyIsNeverTarnished: Discovers in the first book that it's impossible to mess up the magic makeover provided by the Blessing Of Aphrodite, even if she wants to.
* BoundAndGagged: Gets captured and tied up in the first, third, and fourth books.
* BraidsOfAction: Normally wears her hair in a long braid down one side with a bird feather. Annabeth has no idea where she finds the time to do it aboard the ''Argo II''.
* CharmPerson: Like a few other children of Aphrodite, Piper has the ability to 'charmspeak' people, which basically amounts to [[TheCharmer getting people to do things you want them to do]], sometimes without them knowing.
* TheChick: Being the daughter of Aphrodite, when sometimes she thinks of charmspeaking as nothing more than having a "pretty voice", and a dagger that's not really meant for combat? Piper sometimes feels like she falls into this when it comes to the seven.
* CoolLoser: While at school, she has all of two friends and is shunned despite her beauty and personality.
-->'''Leo''': ...if those girls found out the truth about her dad, they'd all be bowing down to her screaming, 'We're not worthy!'.
* ConflictingLoyalty: When her father gets captured for most of the first book, she is torn between saving him (which requires pledging allegiance to Gaea) and risk his life to save the world.
* DeadpanSnarker: Gets a moment of this in ''The House of Hades'':
-->'''Khione''': Jason will ''[[{{Pun}} grace]]'' my throne room.
-->'''Piper''': Clever. Take you all day to think up that line?
* EmotionsVsStoicism: Because she's Aphrodite's daughter, she tends to play the "emotions" part, especially when paired with logical Annabeth or stoic Jason.
* EverythingSoundsSexierInFrench: It's the language of love, so she can speak it.
* FakeMemories: Her relationship with Jason was thanks to Mist manipulation.
* FirstGirlWins: Introduced as the first person Jason meets on the bus and his girlfriend. [[spoiler:It turns out they weren't dating to begin with and it was all just fabricated memories of the Mist, but over the course of the first book they have genuinely grown to have feelings for each other. Despite Jason remembering a girl he was close to back in Camp Jupiter, Reyna, he's gotten together with Piper in the time between the two books.]]
* GutFeeling: Has pretty good instincts thanks to being more attuned to people's emotions. This gets her out of the Temple of Fear in ''The Blood of Olympus,'' as it was all about following instincts and trusting your emotions.
* HairDecorations: Wears a feather in her hair with her braid. In the last book, it's specifically a bright blue harpy feather.
* HeartIsAnAwesomePower: Ratchets her use of her Charmspeak up to awesome levels in ''The House of Hades'', where she uses it to defeat [[spoiler:Zethes, Calais and ''Khione''.]] Said defeat included using Charmspeak to ''power up the deactivated Festus.''
** And manages to top even that in ''Blood Of Olympus'', when she manages to use her charmspeak to knock out [[spoiler: ''Gaea herself'']].
* HumanMomNonhumanDad: Inverted; her mother is a goddess and her father is a mortal actor.
* IJustWantToBeNormal: Several times Piper wishes she weren't a demigod so she could live a normal life.
* ImprobableWeaponUser: From ''Mark of Athena'' and onwards, she uses a food-shooting cornucopia as one of her weapons.
* KaleidoscopeEyes: Her eyes are a mix of brown, blue, and green.
* KnifeNut: Wields Katoptris, a dagger once held by ''the'' Helen of Troy. It can see the future. It was used as a ceremonial weapon, although it can still kick monster ass.
* LikeBrotherAndSister: Leo's the annoying little brother she never had. She'll still kill even a giant if they mess with him, though.
* TheLoad: She feels like this among the Seven, being one of two members of the team without powers directly useful in physical combat -- the other is [[TeenGenius Annabeth]], who more than makes up for it with smarts and combat experience. Then she learns she can use her charmspeak in truly powerful ways.
-->"Piper had a new entry in her top-ten list of ''Times Piper Felt Useless.'' Fighting Shrimpzilla with a dagger and a pretty voice? Not so effective."
* LonelyRichKid: Her classmates don't know about her movie star father, and she's shunned because she's "[[CoolLoser different]]." Hence her fear and possessiveness over Jason.
* LoveHurts: Finding out your boyfriend has amnesia and that [[spoiler:he was never really your boyfriend in the first place]] is a lot to take in.
* MeaningfulName: The name is Piper. Pied Piper. The Charmspeak, y'know.
%%MeetCute
* MissingMom: Aphrodite was absent from her life for a long time, and Piper is ''not'' happy about it.
* MoreThanMindControl: The key to using her charmspeak powers properly, as she works out in the fourth book.
* MundaneUtility: Uses her cornucopia to pop out food for her picnics.
* NoodleIncident: "I'm...not good with cows."
* ObliviouslyBeautiful: Didn't really realize how pretty she was until she was claimed as Aphrodite's daughter.
* OfficialCouple: With Jason.
* OffscreenMomentOfAwesome: According to Jason, she defeated a flock of harpies on her own some time between ''House of Hades'' and ''Blood of Olympus''.
* PluckyGirl: Piper always remains positive despite all the troubles she goes through as part of the Seven.
* RealWomenNeverWearDresses: She seems to have ingrained this into her mentality -- she expresses disdain for her more stereotypically feminine mother and siblings and their corresponding ineffectiveness in battle.
** She [[{{CharacterDevelopment}} later grows out of this]] and realizes that you can be feminine, charming ''and'' a badass.
* SecondLove: May be this to Jason, depending on just how ''close'' Jason and Reyna were before he was memory-wiped.
* ThePowerOfLove: Her voice is enough to [[spoiler:revive Jason even after his brain's been fried by Hera/Juno's true form.]]
* SecretlyWealthy: Her classmates never catch on that she's a Hollywood kid.
* {{Seer}}: By looking into her dagger like a looking glass. Most of the time it shows her the most horrible parts of her present and future. At one point she wonders how Helen of Troy stayed sane with it...and then realizes that she probably didn't.
* SpoiledSweet: Is the daughter of famous actor Tristan [=McLean=] and isn't very spoiled, other than her justified desire to spend some quality time (that is, ''longer than five minutes'') with said busy parent without any interruptions.
* StickyFingers: She's a kleptomaniac on record -- however, this was only to get attention, and she wasn't ''consciously'' stealing, just using her charmspeak.
* {{Tomboy}}: Piper despises stereotypically girly things.
* TookALevelInBadass: She takes swordfighting lessons with Hazel in ''House of Hades'' and gradually becomes more skilled with her charmspeak, [[spoiler:to the point of being able to put ''Gaea herself'' to sleep so she can be finished off]].
* {{Tsundere}}: She's usually pretty nice, but can be snappy.
* TwoGirlsToATeam: After [[spoiler:Annabeth falls into Tartarus with Percy at the end of ''Mark of Athena'']], she and Hazel are the only girls on the ''Argo II'' for most of ''The House of Hades''. They end up bonding over this.
* UnkemptBeauty --> BeautifulAllAlong[=/=]SheCleansUpNicely: [[spoiler: After she receives Aphrodite's blessing, which gives her an entirely new makeover that only lasts temporarily]].
* UnnecessaryMakeover: An in-universe example according to Jason -- she was already lovely ''before'' Aphrodite's claiming gave her a makeover.
* TheUnfavourite: She feels like she's become this to Aphrodite after hooking up with Jason, because having successfully become the girlfriend of the guy she's in love with, she's become less interesting as a person to her mother (who outright says that she thinks of the Seven as stories, as opposed to actual people).
* WellDoneDaughterGirl: Rarely got to spend any real time with her dad. She stole things to get his attention, and has a game that they play in place of bonding, initially.
* WhatWouldXDo: After [[spoiler:Annabeth falls into Tartarus with Percy]], Piper finds herself wondering what Annabeth would do in her situation of defeating [[spoiler:Khione, Zethes, and Cal.]]
[[/folder]]

[[folder:Leo Valdez]]

!!Leo Valdez

-->''"Delaying death is my favorite hobby."''

The son of Hephaestus and mechanic Esperanza Valdez, Leo had a happy childhood with his mother until her death. He is introduced as being Jason's best friend and BromanticFoil. He is ecstatic at the discovery that he is a son of Hephaestus, and takes great delight in the camp machinery. He's the one that manages to fix Festus the bronze dragon (from the ancillary story ''The Bronze Dragon'') despite it going haywire after Charles Beckendorf's death, and it's what he, Jason, and Piper ride on the quest to rescue Hera. Later, he is tasked with building the ''Argo II'', a flying trireme that will be the Seven's main vehicle for their journey to topple Gaea.

Leo is wiry, funny, energetic, immature, and upbeat. He has a tendency to fall in love fleetingly with any beautiful girl that crosses his eye. However he's also deeply insecure, stemming from his own past. Its implied he's not really good with people due to, like his father, being frustrated that they aren't as simple as machines, and even his own sense of humor is tied to his lack of self-worth -- he cracks jokes to not be overwhelmed by the negativity. Although most of the time his jokes are taken in stride, they can hurt the more sensitive like Frank and Nico, and part of Leo's CharacterDevelopment is letting go of his past, maturing, and learning to fight alongside his teammates.

As a son of Hephaestus Leo is naturally extremely gifted with machines, moreso than his siblings. He also has a magical toolbelt that can procure anything one might find in a garage (even [[MundaneUtility breath mints!]]). He is also gifted with the very rare ability to command [[PlayingWithFire fire]], an ability that hasn't been seen in a century, but something he's wary about using due to his DarkAndTroubledPast.

----
* AffirmativeActionLegacy: He's Latino and taking his cues from his father, the Greek Hephaestus
* AllGirlsWantBadBoys: Mocked with Narcissus's nymphs -- he pretends to be a loud and obnoxious "bad boy" who thinks he's better than Narcissus to distract him and the nymphs from noticing Hazel stealing the bronze.
* AloneAmongTheCouples: In books three to five, where everyone else is paired off. That said, Leo has crucial ties to all three of the couples.
* AndTheAdventureContinues: [[spoiler: In the final scene of the entire series, he and Calypso fly off into the unknown atop Festus.]]
* AndThisIsFor: "THIS IS FOR MY MOTHER, ESPERANZA VALDEZ!"
* BackFromTheDead: [[spoiler: Administers the physician's cure on himself after dying while stopping Gaea, bringing him back to life]].
* BagOfHolding: Leo's magic toolbelt. It can hold anything that fits into his pockets, and can produce anything that would reasonably be found inside of a garage. [[RunningGag As well as breath mints.]]
* BewareTheNiceOnes: Leo is the most friendly and cheerful of our new characters. He is also one of the most dangerous, having powers he can't always control.
* BromanticFoil: Jason's best friend. He's also louder, funnier, wirier, and more into girls.
* CallingTheOldManOut: He talks back to his dad in a way that not even Percy Jackson would've, and he doesn't even get struck down- if anything, it actually gets him respect.
* CasanovaWannabe: Leo is fond of hitting on pretty girls out of his league. In ''The House of Hades'', he laments not being as {{hunk}}y as Jason, because that would have gotten him out of his current situation.
* TheChessmaster: [[spoiler: Rebuilt the body of the machine dragon Festus inside the hull of the ''Argo II,'' then installed the physician's cure into the dragon so it could bring him back to life, as Festus was the only thing capable of surviving Leo's HeroicSacrifice when he blew himself up to take out Gaea. This also got him around the rules of Ogygia, as the island can only be found once in a lifetime by a demigod, but Leo died and then came back. ''Nobody'' figured this out, not even Annabeth, and his death only registered on Nico's radar as odd, not false.]]
* DarkAndTroubledPast: Apparently accidentally killed his mother with his [[PlayingWithFire fire powers.]] He also had a divine grandma who (sort of) tried to kill him several times. Not to mention Gaea messing with his head.
* DemonicPossession: [[spoiler: He gets possessed by an eidolon, which makes him open fire from the Argo II onto New Rome and incurs the fury of the Romans against the Greeks.]]
* DropTheHammer: Sometimes uses a sledgehammer in combat.
* DyingMomentofAwesome: [[spoiler: Leo goes thermonuclear to kill Gaea. He got better.]]
* TheEngineer: Like all of Hephaestus's kids, he's good at building and fixing, but Leo's an especially prodigious one. He kept Festus going and built the ''Argo II''.
* EveryoneKnowsMorse: Leo learned it from his mother as they used it to keep track of each other when at her workplace. Only Leo is shown to know it and it doesn't serve any real plot relevant purpose [[spoiler: except when Festus gives Leo a final message.]]
* FirstKiss: For all of Leo's flirting, he's never been kissed [[spoiler:until he leaves Calypso's island.]]
* GadgeteerGenius: Even when Leo's doing nothing in particular, he still can fashion incredible machines. When he puts his mind to something, he can make automatons or huge warships.
* GenerationXerox: He’s a dead ringer for his great-grandfather, [[spoiler: Sammy Valdez]].
* GreaseMonkey: As the team mechanic, he's always running around greased due to constantly fixing things.
* HeartbrokenBadass: Becomes this around three quarters of the way through ''The House of Hades'' after [[spoiler: he ends up on Calypso's island, falls in love with her, and then is forced to abandon her]]. He is noticeably different for the rest of the book, [[OOCIsSeriousBusiness less twitchy, more serious,]] and well, in the words of Jason:
--> '''Jason:''' ''[[OOCIsSeriousBusiness All the nervous energy had drained right out of him, replaced by a kind of wistful sadness. ...Leo was heartsick.]]''
* HeightAngst: He is short and skinny, which does a number on his self-esteem, especially with his male compatriots all being tall and muscular save Nico.
* HeroicSacrifice: [[spoiler: Dies defeating Gaea, which was part of his plan all along. Fortunately, that plan also involved resurrection via the physician's cure.]]
* HeroicVow: [[spoiler: It ends up being "the oath to keep with a final breath" of the Prophecy of Seven.]]
--> "I'll come back for you, Calypso. I swear upon the River Styx."
* HumanMomNonhumanDad: His dad is Hephaestus.
* IdenticalGrandson: [[spoiler:He resembles his great-grandfather, Sammy, so much that Percy and Hazel think he's actually Sammy when they first get a look at him]].
* ILetGwenStacyDie: He blames himself for his mother's death, which was especially scarring.
* InLoveWithLove: Leo pretty much falls for any girl who's out of his league, namely Khione and Thalia. Though, he gets over Khione rather quickly when she reveals herself to be a villain. This trait disappears after [[spoiler: his first visit to Ogygia.]]
* InfiniteSupplies: That toolbelt of his is enchanted to "contain anything that could be found in a garage", which includes everything from small tools and materials, to a sledgehammer, to taco ingredients, to [[RunningGag breath mints.]]
* ImprobableAimingSkills: Hits an elevator button from thirty feet away ''by chucking a screwdriver like a throwing knife''.
* JustFriends: [[spoiler: With Hazel.]]
* LadykillerInLove: "Ladykiller" may be a bit overstating it, but after his [[spoiler: first]] visit to Ogygia, he completely stops hitting on other girls.
* LastWords: "And by the way-[[TrueCompanions I love you guys]]."
* LikeBrotherAndSister: With Piper. Despite her beauty, [[TheBroCode he never hits on her or asks her out]], and they treat each other like affectionate siblings.
* {{Keet}}: He's fun-loving and always full of energy and good times. He's got so much nervous energy that he's got to constantly keep his hands moving. It has even been noted that his ADHD is still exceptional, even for a demigod.
-->ALL DA LADIES LUV LEO
* KillItWithFire: When Leo starts bringing out the fireballs, ''start running'' -- as [[spoiler: Khione and ''Gaea herself'']] find out.
* MacGyvering: Being a child of Hephaestus, tinkering and building comes naturally, but he also has an infinite supply of tools (due to his tool belt) as well as his fire-controlling ability (which he uses to bake bricks and weld metal). Heck, when he crash-landed on [[spoiler: Ogygia]], literally all Leo had were the clothes on his back, his tool belt, and the Archimedes Sphere. He managed to cobble together a very slap-dash but functional personal helicopter in about thirty seconds. It chugged along for a few seconds before promptly exploding, but at least the blast saved him from becoming a bloody splat on the beach below.
* ManOnFire: The first child of Hephaestus to be born in decades with the ability to summon fire. It only makes Leo more nervous since not only does he have a fifty percent chance of destroying the world, but he could also very easily kill another member of the seven.
* MayflyDecemberRomance: [[spoiler:He falls in love with Calypso, a Titan's daughter and goddess who's been around for millenia]].
* MyGreatestFailure: After he thought that he killed his mom, Leo didn't want to use his fire powers ever again before his quest with Jason.
* TheNicknamer: To his friends' frequent annoyance.
* PlayingWithFire: Leo is the first son of Hephaestus to have this ability since 1666.
* PluckyComicRelief: Always count on Leo to be able to diffuse the tension or solve problems by being his goofy self.
* PlayfulHacker: He apparently once hacked a copy of Mario Party 6 and added a fourth difficulty: Idiot Mode. Basically ArtificialStupidity TurneduptoEleven.
* ReplacementGoldfish: Hazel worries about seeing him as a replacement of [[spoiler:her first boyfriend Sammy, his great-grandfather]]. She seems to be moving past it by the fourth book.
* TheRunaway: Ran away from home six times.
* SadClown: He smiles and jokes since its easier than being sad about things he can't change or that scare him. Subverted, since Jason notes how important Leo's sense of humor is to team morale.
* SelfMadeOrphan: This is the reason why he 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; he 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 he only met at 15...]]
* SheIsNotMyGirlfriend: Says this almost word-for-word when [[spoiler: Calypso assumes that Reyna is the Penelope to his Odysseus (or Annabeth to his Percy, or Elizabeth to his Sir Francis Drake)]].
* StepfordSmiler: Type A. He's upbeat and friendly on the outside, but melancholy and lonely on the inside.
--> ''Keep moving.'' Don't get bogged down. Don't think about the bad stuff. Smile and joke even when you don't feel like it. ''Especially'' when you don't feel like it.
* TeamChef: Able to whip up pretty boss veggie tacos anywhere and anytime you could possibly want them. Just ask Piper or Jason.
* TricksterArchetype: He's described as having a devilish smile that makes people go "Don't even think about it!" Probably for good reason.
%%* {{Tsundere}}: At least towards [[spoiler:Calypso when he's marooned on her island.]]
* UtilityBelt: A thick leather tool belt with a LOT of pockets. Contains all sorts of tools and switches, bits and bobs, odds and ends, oh, and a [[DropTheHammer sledgehammer]]. And [[RunningGag breath mints]].
* WalkingTheEarth: [[spoiler: His and Calypso's plan for the unforeseeable future.]]

[[/folder]]

[[folder:Frank Zhang]]

!!Frank/Fai Zhang

-->''"Tactics. That’s my gift from Mars. A battle can be won before it’s ever fought by choosing the right ground.''"

Frank is the son of Mars and soldier Emily Zhang. On his mother's side, he is descended from Poseidon through one of the Argonauts. Due to this powerful legacy and the subsequent gifts he receives thanks to them, the gods (specifically Juno), decide to balance this out by tying his life to a piece of wood -- should the wood ever burn out, Frank dies.

After his mother's death in Afghanistan he is sent to Camp Jupiter after spending some time with his wealthy grandmother. After Percy's arrival he is claimed as a son of Mars, much to his disdain -- as tender, pacifistic Frank couldn't be more different from his militaristic, warlike siblings. Frank is designated leader of the quest to rescue Thanatos, and chooses Hazel and Percy to go with him. This quest brings him and Hazel closer together, and they are dating by the end of the second book.

Frank is at first shy and clumsy due to his own insecurity, but later grows more confident and sure of himself and his talents over the course of the series. Interestingly, because Frank's life is tied to a stick, he is the only one of the Seven Gaea is incapable of manipulating.

Due to his heritage, Frank has several powers and talents. Being the son of Mars, he has a remarkable talent for tactics and strategy, as well as being excellent in physical combat and being a natural-born battle commander. He's also very talented with a bow and arrow. Thanks to being descended from Periclymenus, the Zhang family gift -- the power to [[{{Animorphism}} shapeshift into any animal]] -- was passed down to him as well.

----
* AchillesHeel: His life force is bound to a stick of wood. If/when it burns up, Frank will die.
* AffirmativeActionLegacy: Chinese-Canadian, taking over for the Italian Mars.
* {{Animorphism}}: The Zhang family gift.
* BadBadActing: Frank has many talents, acting is not one of them.
* BigFun: The first thing that jumps out to Percy is that he's like a baby panda.
* TheBigGuy: Lampshaded repeatedly. It's easy to lose track of how many times the text refers to him, verbatim, as "the big guy." Further solidified with his OneManArmy stint in the fourth book.
* CallingTheOldManOut: His dad is Mars, and considering his mom died in war, Frank’s not happy about it. See YourApprovalFillsMeWithShame below.
* {{Determinator}}: Fights to free Thanatos even if it means [[spoiler: ''literally'' burning his life away.]]
** Becomes this in full in ''The House of Hades'', taking [[spoiler: Jason's place as Praetor]], and doing a complete 180 from his first appearance in ''The Son of Neptune''.
** It's directly stated by Mars that Frank will have to save the quest by helping [[TheHero Percy]] to make a SadisticChoice that his FatalFlaw would never let him make. [[spoiler:He does it by never letting Percy have the choice in the first place. Frank goes along when Leo enlists him in pulling off a HeroicSacrifice without the other Greeks and Jason interfering.]]
** Outright stated that this is why Gaea wants him dead. Because of his sense of duty and self-sacrifice, he's the only one of the seven that she can't manipulate.
* DistressedDude: Percy pulls a BigDamnHeroes to save him from the Gorgon sisters near the beginning of ''Son of Neptune''.
* DramaPreservingHandicap: Frank has to be really careful around fire. (He is understandably somewhat uncomfortable around Leo.)
** Mentioned in universe -- because of his powers from his mom's side and being Mars' son and having his tactical powers, he has "too many gifts." Ergo, Fate basically decreed he have a limit.
* EmbarrassingFirstName: Frank's grandmother is the only one to call him by his Chinese name, Fai.
* EveryoneIsRelated: He’s a descendant of Poseidon on his mother’s side, making him a distant relative of Percy.
* FieldPromotion: [[spoiler:Jason promotes him to ''praetor'' in the midst of a battle in the fourth book.]]
* FromNobodyToNightmare: His first appearance is as a son of Mars in [[NewMeat probatio]], belongin to the fifth cohort. By the end of the books he becomes the Legion's [[AsskickingEqualsAuthority Praetor]] and, as noted above has [[TookALevelInBadass taken some god-damn levels]]
* HearingVoices: In ''The House of Hades'' it's revealed Ares's and Mars's voices have been bickering in his head for a while, and is a major factor towards his hostility towards Leo. Given how different those two facets of his father are, it can't have been pretty.
* HeroicBuild: [[{{GrowingMusclesSequence}} The first thing that jumps out to Percy upon his return from Tartarus is that Frank now looks like a football lineman.]]
* HeroicSelfDeprecation: As his father pointed out, he considers Percy [[AlwaysSomeoneBetter better than him]] and constantly dumps on himself, at least until near the end when CharacterDevelopment kicked in and he became more confident.
* HeroicSacrifice: Subverted, but it's a very narrow thing. See {{Determinator}} above.
* HistoryRepeats: This time, it's Meleager's story.
* HowDoIShotWeb: It takes Frank almost until the very end to figure out how to activate his family's gift.
* HumanMomNonhumanDad: Mars took a shine to his mom.
* IGotYouCovered: Frank to Hazel and Percy while they were escaping from the Zhang residence. Percy to Frank in Alcyoneus’ lair.
* ImmuneToFate: Mentioned as why Gaea is willing to kill him, she can't predict his future, or manipulate him emotionally. His freedom of choice and ability to change also connects to his unique talent, shapeshifting. Notably, he IS cursed with a short life, as a price for his many powers; it's just no one can predict the how and when.
* LineageComesFromTheFather: Played with. Even though he's a son of Mars, Frank's coolest power comes from his mortal mother.
* MilitaryBrat: His mom was in the Canadian military, and was one of the first women to die in combat, according to Frank.
* MySpeciesDothProtestTooMuch: He starts out as a child of the god of war who hates war while all of his siblings are {{Blood Knight}}s.
** Though Frank is actually truer to Mars's (as opposed to Ares's) stated views on war.
* OfficialCouple: With Hazel.
* OneManArmy: [[spoiler:Was granted the blessing of Mars in the fourth book, temporarily turning him into one of these.]]
* ScaledUp: In ''Mark of Athena''. He can turn into a dragon at full power, meaning he isn't limited to normal animals.
* SecondLove: To Hazel, after Sammy.
* SecretLegacy: Descended from Periclymenus, one of the Argonauts, on his mom’s side.
* SecretlyWealthy: The Zhangs are loaded, but you couldn't tell that by looking at Frank.
* ShoutOut: To Meleager, whose life was tied to a piece of wood and was killed when his mother threw it in the fire.
* SitcomArchnemesis: With Leo, though it's kind of understandable as Frank's life is tied to a stick and Leo has hard-to-control fire powers. They seem to be moving past it when [[spoiler:Leo gives him a fireproof pouch to carry his firewood in.]]
* TheStraightAndArrowPath: Is a really good shot with a bow and arrow, despite this being set in the 2010s.
* TheStrategist: Got this as a power from his dad, Mars. He does most of the battle tactics when Annabeth is out of the picture.
* ThisIsForEmphasisBitch: "Welcome to Canada, idiot."
* TookALevelInBadass: In ''The House of Hades'' after managing to defeat every ''katobleps'' in Venice, getting taller and buffer. Hazel notes that something's different about his personality, though. And later again when [[spoiler:Jason emergency-promotes him to Praetor, giving him command of a full Epirus ghostly legion.]]
** He worries that his drastic change in appearance and demeanor will make the others treat him differently. [[FemaleGaze Hazel does not mind.]]
* YouAreBetterThanYouThinkYouAre: On the receiving end of this from pretty mucho every good guy he meets, it seems to finally sink in at the end of the fourth book
* YourApprovalFillsMeWithShame: Feels this way about Mars boasting about him after the war games, but subverted after Mars appears to him in Venice.

[[/folder]]

[[folder:Hazel Levesque]]

!!Hazel Levesque

-->"''I'm not choosing one of your paths. I'm making my own.''"

Hazel's past is a long one. A daughter of Pluto, she was born in 1920's New Orleans to Marie Levesque, a struggling fortune teller. Marie had asked Pluto to give her all the riches of the earth, and Pluto had obliged by giving their daughter the power to summon gemstones. However, the gems she summoned were cursed, leading their buyers to horrible fates, and she and Marie ended up none the better. Because of this she was ostracized at school save for her sole friend Sammy, whom she lost when her mother moved them to Alaska, beyond the power of the gods. There, Gaea forces Hazel to resurrect Alcyoneus, the oldest and most prominent giant. Instead, Hazel destroys the island with her powers, killing her, her mother, and Alcyoneus, and delaying Gaea's plan for the better part of a century.

Afterwards, because Hazel gives up her chance at Elysium to save her mother from the Fields of Punishment, she spends seventy years in the Fields of Asphodel until Nico di Angelo, her half-brother, comes looking to resurrect his sister Bianca. Upon learning that she'd been reincarnated, he resurrects Hazel instead, and she is brought to Camp Jupiter, where she is an integral part of the quest to rescue Thanatos. She begins a relationship with Frank.

Despite being one of the (physically) youngest on the team, Hazel is very affectionate and motherly, and served as the primary source of comfort for Frank and Percy on their quest. She's very mature for her age, although this could be due to being around eighty years old. Whenever she thinks about her past life she has flashbacks (akin to very real dreams) towards them, and can even pull others in with her.

Hazel is gifted with several powers. Beyond the aforementioned ability to summon gems, she is also able to [[GemstoneAssault use them in combat]]. She's also gifted with the power to control [[DishingOutDirt earth]], as it's her father's domain. In the fourth book, she learns to manipulate the Mist.

----
* ActionGirl: Causing precious metal avalanches and holding off the Romans atop Arion with her cavalry sword is just another day for her, being one of the seven.
* AffirmativeActionLegacy: African-American. Finding out the Roman demigods sided with the Confederacy in the American Civil War did not make her happy, since her grandmother had been a slave.
* AllGirlsLikePonies: Horseback riding is one of her great loves. The Romans look down on her for using a large cavalry broadsword, designed for someone fighting on horseback, because a good Roman is a foot soldier.
* AllOfTheOtherReindeer: Got picked on a lot as a kid in New Orleans. Camp Jupiter wasn’t all that much better.
* ArtifactOfDeath: Capable of summoning gems and metal from the earth, but misfortune comes to anyone who takes them. These cursed rocks don't effects her CoolHorse, who eats the gold she pulls up.
** Notably LaserGuidedKarma to her mom, who wished the "gift" onto her -- ruining her life.
* BackFromTheDead: Spent 70+ years in the Fields of Asphodel after she sacrificed her place in Elysium to keep her mother out of the Fields of Punishment. Got out after Nico, after discovering that Bianca had already chosen to be reborn, rescues her instead.
* BeCarefulWhatYouWishFor: Pulls up cursed riches due to mommy's request gone wrong.
* TheBigEasy: Lived almost her whole life in the French Quarter of New Orleans with her mom. Even in her new life, she originally finds it very hard not to spend half her time back there, one way or another.
* BigSisterInstinct: While it's hard to say whether Hazel or Nico is officially the older sibling (Hazel was born first but died at 13 and hasn't aged a full year yet, while Nico is a "few" years younger chronologically but has actually celebrated 14 birthdays), it is ''not'' a question that Hazel doesn't appreciate anyone questioning the wisdom of saving Nico's life.
* BlessedWithSuck: Her dad's Pluto, so she has control of "all the riches under the Earth". It's a pretty sweet deal, unless a horrible curse wasn't directly tied to how valuable the metals were. So, if you aren't her, touching the metals she summons is bad for your health.
* CoolHorse: Is the only person ''the'' CoolHorse, Arion, will listen to (thanks in no small part to her gold-producing powers).
* CurtainsMatchTheWindow: Downplayed, she has caramel hair and gold eyes.
* DarkAndTroubledPast[=/=]DarkSecret: Was forced by Gaea to use her powers to reconstruct Alcyoneus in Alaska.
* DarkSkinnedBlonde: Her hair is described as being caramel.
* DeliberateValuesDissonance: When Hazel and Leo are dealing with Narcissus in ''The Mark of Athena'', she's as enraptured as any of the nymphs. Until he makes a remark about how Narcissus loves "him". Hazel turns up her nose and doesn't think anything of him anymore. She's from the 1940s, so it's a nod to how certain attitudes from seventy years ago are still ingrained in her.
* DishingOutDirt: Daughter of Pluto. Unlike Nico, she got the "god of wealth" half as opposed to the "god of death" half. Unfortunately, her power is mostly limited to precious gems and metals. It's also [[CursedWithAwesome the curse her mother saddled her with.]]
* FaceDeathWithDignity: Death tells her point-blank that she should ''not'' be helping to free him, and she desperately doesn't want to die again, but she gets the job done.
* FishOutOfTemporalWater: Spent over seventy years wandering the Fields of Asphodel. Nico brought her back.
* ForeignCussWord: "As Hazel marched up the hill, she cursed in Latin. Percy didn't understand all of it, but he got ''son of a gorgon, power-hungry snake,'' and a few choice suggestions about where Octavian could stick his knife."
* GemstoneAssault: How she usually attacks with her powers.
* HatePlague: The ''other'' reason why it sucks to be a child of Hades/Pluto. Wherever she goes, she is deeply feared and hated by almost everyone around her (save for her close friends).
* HeroicSacrifice: Killed herself and her mother to stop Gaea from raising Alcyoneus and then gave up Elysium so her mother wouldn’t go to the Fields of Punishment.
* HumanMomNonhumanDad: Her mother is a mortal and her father is Pluto.
* InstantExpert: In ''The House of Hades'', when it comes to Mist manipulation -- over the course of the book she ends up better than it than [[spoiler: a millennia-old sorceress]]. Hecate, Goddess of Magic, implies this is due to her [[LiminalBeing liminal status]].
* ItsAllMyFault: Alcyoneus coming back to life was directly Hazel's doing. Even though she was forced to by Gaea, Hazel still feels hugely guilty.
* JediMindTrick: Hazel uses the Mist to manipulate people's perception. [[spoiler:It's how she defeats Pasiphåe.]]
* JustFriends: With Leo. She eventually realizes that it isn't fair to [[spoiler: see Leo as a replacement for Sammy]], and continues dating Frank.
* LikeBrotherAndSister: With Percy.
* LiminalBeing: Doubly, owing not only to being half mortal half god, but having died and come back to life. Hecate (at a crossroads) tell her this gives her power over the veil between the worlds. It's also implied that this is why she is such a prodigy at manipulating the Mist.
* LongLostRelative: To somebody we know well from Camp Half Blood. Seems to be a trend in this series. [[spoiler: Turns out to be Nico.]]
* MeaningfulName:
** Levesque means either somebody who served in the household of a bishop, or just bishop. Of ancient Greek origin, curiously.
** Also, hazel trees are sometimes called "hazel witch trees" due to the healing properties of hazelnuts.
* NewPowersAsThePlotDemands: Can suddenly do sorcery in the fourth book after receiving a blessing from Hecate, with this having never been brought up before and Hazel having received no previous training. It's foreshadowed when her mother reveals that she summoned Pluto with sorcery, but still somewhat out of left field.
* [[NiceGuy Nice Girl]]: Her defining trait is her kindness.
* OfficialCouple: With Frank.
* OlderThanTheyLook: Mentally, anyways. Being a child of Pluto, she remembered everything during her 70+ years in the Fields of Asphodel.
* PensieveFlashback: Hazel has some pretty powerful "blackouts". She even manages to pull Frank and Leo into them.
* ResurrectedForAJob: Nico's intention was for her to correct her mistakes and hopefully achieve Elysium.
* RaginCajun: Lived in New Orleans until she was 13.
* ReplacementGoldfish: Technically being Nico's sister, she has shades of this for Bianca, as the latter had been Nico's first choice to resurrect before he found her,
* SelfMadeOrphan: She killed her mother and herself to stop Gaea from raising Alcyoneus back in 1942.
* SupernaturalGoldEyes: Justified. She’s the daughter of the god of wealth.
* TeamMom: Percy and Frank start depending on her for comfort in ''The Son of Neptune''.
* TwoGirlsToATeam: After [[spoiler:Annabeth falls into Tartarus with Percy at the end of ''Mark of Athena'']], she and Piper are the only girls on the ''Argo II'' for most of ''The House of Hades''. They end up bonding over this.
* UnfinishedBusiness: Hazel delayed Alcyoneus' resurrection in the 1940s, but he was alive and kicking by the 1980s, when he massacred Michael Varus and the Fifth Cohort and stole their eagle standard and equipment. One of the reasons Nico brought her back to life seems to have been to defeat Alcyoneus.
* WeirdnessCensor: Hecate tells Hazel she will have to learn to control the Mist to make it to the House of Hades.
* WhatCouldHaveBeen: In-universe example. Had she stayed in New Orleans, Hazel would have grown up to marry her childhood friend, Sammy.

[[/folder]]

!!Other POV Characters

[[folder:Nico di Angelo]]

!!Nico di Angelo

-->''"...The only person who ever accepted me was Bianca, and she died! I didn't choose any of this. My father, my feelings..."''

Son of Hades and Maria di Angelo, as well as a returning character from ''Literature/PercyJacksonAndTheOlympians''. After the fall of Kronos, Nico spent more time in the Underworld looking to resurrect his late older sister Bianca, but resurrects Hazel instead after realizing Bianca had chosen to pass on. In the first book Annabeth mentions he's been helping out with the effort to find Percy, but he otherwise doesn't appear, spending most of his time either in the Underworld or Camp Jupiter as Pluto's ambassador.

In the second book, Nico reveals his personal quest to search for the Doors of Death -- however, he is captured by Gaea's forces and is held captive for the majority of the third book.

Because of his reserved, anti-social, secretive personality, he puts up several walls, some of which he is forced to tear down over the course of the series. However, he has a notable soft spot for his sister Hazel.

Being a son of Hades, Nico has several powers -- he can control the earth, [[CastingAShadow shadows]], and can communicate with the dead. He fights with his unique Stygian iron sword.

----
* AloofAlly: Even when working with the crew in the fourth book, Nico doesn't talk much and prefers to stand off to the side.
* AlwaysSecondBest: Narrowly misses being the hero of the last Great Prophecy, then Hazel shafts him out of being one of the Seven.
* {{Ambadassador}}: Serves as Hades's main liason to the outside world.
* AnimalsHateHim: Apparently, they can sense the death.
* ArmoredClosetGay: Since he hasn't defined his sexuality completely; however it's worth noting that [[spoiler:he kept claiming to have a crush on Annabeth and the god of love had to ''drag'' out an admission that Nico crushed on Percy before Nico and Jason could proceed with their quest.]] Justified, though, as a demigod son of Hades not even from this century, he felt like it would only ostracize him more.
* AscendedExtra: Goes from DemotedToExtra in the first three books to getting lots of focus in the last two.
* BadassInDistress: At the end of the second book as a result of some RecklessSidekick behavior investigating the Doors of Death himself, he gets captured by Gaea's forces. He's held captive in a jar throughout the third book until he's rescued.
* BadassGay: He has (or had) [[spoiler:a crush on Percy]] and he is one of the most powerful demigods in the series.
%%TheBait
* BelligerentSexualTension: [[spoiler:His bickering with Will Solace in the last book is heavily implied to be this. They are an OfficialCouple as of ''Literature/TheTrialsOfApollo'']].
* BigBrotherInstinct: It's hard to say whether he or Hazel is "officially" the older sibling, but Nico clearly loves her a lot, and seems to spend quite a bit of his time at Camp Jupiter talking to her and cheering her on.
** [[spoiler: The end of the fifth book reveals that Hazel considers him to be her big brother, cementing this trope.]]
* BigSisterWorship: Less so than the previous series, but he's still pretty hung up over Bianca.
* BlackSheep: Among the demigods, being a son of Hades and all -- he just doesn't fit in. Although Will Solace makes the point that a lot of this is self-inflicted.
* BlackSwordsAreBetter: Wields a sword made from Stygian iron, a black material from the Underworld.
* BrokenPedestal: Downplayed. Percy was the first demigod Nico ever saw in action, and he idolized him up until Percy told him that Bianca was dead.
* CannotSpitItOut: [[spoiler:In ''The House of Hades'', he absolutely ''refuses'' to admit he has any feelings for Percy, to the point that Cupid has to force a confession out of him.]]
* TheComicallySerious: Occasionally, his frowning and seriousness at a joke is funnier than the actual joke.
* CoolSword: Stygian iron, my friends.
* CreepyGood: He is repeatedly described as unnerving and difficult to figure out by the other demigods. His penchant for StealthHiBye doesn't help.
* DarkIsNotEvil: A child of Hades who can talk to the dead and fights with shadows and dresses in all black? Loyal to the Greeks as they come.
* [[DefrostingIceQueen Defrosting Ice King]]: Thanks to Jason and Reyna he is considerably less prickly by the end of ''Blood of Olympus''.
* DeliberateValuesDissonance: He was raised in the 1930s, which goes a long way toward explaining [[spoiler:why he's so ashamed to admit he had a crush on Percy.]]
* DemotedToExtra: In the first three books. He plays a large role in the fourth, and gets POV chapters in the fifth.
* DidNotGetTheGuy: [[spoiler: The guy in question being Percy Jackson.]]
* DreamWeaver: To a degree. He can travel and communicate through dreams, but not as well as Clovis can.
* EeriePaleSkinnedBrunette: He was described as olive-skinned in the first series (as his mother was Italian), but his skin paled to white as he spent more time in the Underworld. This carries on into this series. After [[spoiler: returning from his capture in Tartarus]], his skin is described as "a sickly greenish-white, like the color of tree sap."
* EverythingsDeaderWithZombies: Not only dealing with skeletons, bones, and shadow, he also has a zombie driver named Jules-Albert gifted by his dad. A zombie who's previously a French racer when he's alive.
* {{Foreshadowing}}: At the end of the Battle of the Labyrinth, during the massive battle, Percy notices some monsters break off from the large group and head towards the camp. He calls to Nico to stop them, and Nico summons some undead to take the monsters down. Among the undead: Roman Centurions. At Camp Half-Blood.
* {{Gayngst}}: [[spoiler: In ''The House of Hades'', it turns out at least part of his broodiness and desire to stay away from others stems from his (unacknowledged and repressed) feelings for Percy Jackson.]]
* HarsherInHindSight: All his interactions with Percy in the previous series take on a sadder tone when it's revealed in addition to his blaming Percy for Bianca's death [[spoiler: He is in love with him making it extremely confusing and painful for him considering he was just 10 and so was just starting to realize who he is and coming from a time where it is not accepted.]]
* HatesBeingTouched: Hates touching others, too; the only person he seems to show any physical affection towards is Hazel. [[spoiler: Begins to get over this by the end of the fifth book.]]
* HeroicRROD: Overuse of his underworld powers causes him to flicker like a ghost, and could make him [[NoBodyLeftBehind permanently fade into the shadows]]. [[spoiler:Transporting the Athena Parthenos across the Atlantic nearly does it.]]
* HideYourGays: Very downplayed, but although his feelings for [[spoiler:Percy]] are addressed directly, the words "Gay", "Homosexual" or any equivalent are never used, referring it only indirectly as "What I am" or similar phrases. He is also the only couple that [[MaybeEverAfter is not outright stated to be one (only heavily implied)]] and gets a NoHuggingNoKissing treatment.
* HopelessSuitor: [[spoiler:In ''The House of Hades'', it's revealed that he had a crush on Percy that started in ''The Titan's Curse'', while Percy and Annabeth have mutual feelings for each other.]]
* HumanMomNonhumanDad: His dad is Hades.
* HypocriticalHumor: He's entirely aware of the hypocrisy when he tries to convince Reyna to talk to him about her problems and when he congratulates Hazel for making the most of her second chance at life. He's genuinely annoyed when he realizes he should take his own advice.
* IncompatibleOrientation: [[spoiler: With Percy.]]
* IneffectualLoner: Nico doesn't really like people and prefers to work alone, but he's forced to work with the Seven anyway. Not that he really minds.
** He gets particularly ineffectual over the course of ''The Blood Of Olympus,'' as he's pushing his powers to the brink. He would not have survived the quest without assists from Hedge, Will, various pegasi, and especially Reyna.
%% InformedLoner
* IWorkAlone: Mainly because he feels ostracised and tends to push people away. [[spoiler: Will Solace tells him off for having this attitude.]]
* LooksLikeCesare: Increasingly since the previous series. Leo describes his eyes as sad and tired, and accounts this to him having stared into the depths of Tartarus.
* LonerTurnedFriend: In the previous series, he started out as a friend but became a loner due to Bianca's death. When this series starts he's still aloof and closed-off but willing to work with the heroes, and even becomes the team's SixthRanger of sorts in the fourth book.
* MeditationPowerup: The Death Trance allows him to survive with limited air by eating one seed a day to survive. The seeds in question being from pomegranates grown in Persephone's garden.
* MessyHair: His hair is always overgrown and shaggy.
* MindRape: It is heavily hinted that this is what Nico went through as a prisoner of Gaea, to give an idea of how broken Nico was when he was finally rescued, Percy delivers this thought:
-->Nico’s eyes looked like shattered glass. Percy wondered sadly if something inside him had broken permanently.
* MisunderstoodLonerWithAHeartOfGold: He's seen as creepy by the Romans (and most characters, really) but he does genuinely care. [[spoiler: Subverted near the end of the fifth book, where Will Solace points out that none of the Greeks ostracised him, it was his assumption that they ''would'' that kept him away. This probably has to do with Nico's sexuality and his divine parentage making him feel like an outcast in ''every possible way.'' Indeed, we never see any of the Greek demigods actively push Nico away, though Will is the first one to put his foot down and make it clear that they would be happy to have him around.]]
* MoralityPet: Hazel. Even at his grumpiest, creepiest, most anti-social nadir, Nico is still affectionate to his sister. When Frank can't imagine Nico acting out of love for anybody, he still thinks Hazel would be the exception.
* MurderByInaction: In the fifth book, [[spoiler: he allows Octavian to kill himself in a manmade comet attempting to stop Jason, Piper, and Leo from defeating Gaea when he could have very easily stopped him]], and comforts himself with the thought that some deaths shouldn't be prevented.
%% MysteriousWatcher
* {{Necromancer}}: He can summon and control undead legions.
* {{Necromantic}}: Non-villainous example. He really wanted to resurrect his older sister Bianca.
* NewPowersAsThePlotDemands: {{Lampshaded}} by Reyna when he sends powerful dreams to the mortals aboard the ''Mi Amor'', hoping to keep them asleep, she wonders if he's always had that ability.
* NiceToTheWaiter: Unlike Percy, Nico visited Bob the Titan and spoke with him often, and apparently talked Percy up to him. It serves the dual purpose of saving Percy and Annabeth's lives in Tartarus and getting Percy to realize that he's neglected not just Bob, but Nico himself over the years.
** Recurring character trait since PercyJacksonandTheOlympians
* OnlyFriend: Jason is this for him in ''The House of Hades'' (as Hazel is also his half-sister and [[spoiler: his crush on Percy has complicated their friendship quite a bit.]]) Nico is Alice-1 and Jason acts as Bob-2. This is because he is CreepyGood and a SociallyAwkwardHero, and intentionally pushes people (including Jason) away.
* OppositesAttract: Seems to be the case between him and [[spoiler: Will Solace]]. While Nico is pale with dark hair, and the son of the god of the Underworld, [[spoiler: Will is tan with golden hair, and his dad is the god of the Sun.]]
* PreAsskickingOneLiner: Delivers a pretty good one to [[spoiler: [[OurWerewolvesAreDifferent Lycaon]]]] in ''Blood of Olympus''
** "''Come get me, you mutt! or do you have to ''stay'' like a good dog until your master shows up?''"
* ThePromise: At the end of the third book, Percy makes him promise to lead the rest of the ''Argo II'' to Epirus to retake the Doors of Death [[spoiler:before falling into Tartarus with Annabeth.]]
* RescueRomance: [[spoiler:His crush on Percy started way back in ''The Titan's Curse'' when Percy saved him and Bianca from Dr. Thorn.]]
* TheResenter: He resents both Greek and Roman camps for driving him away, but specifically resents Percy and Thalia for surviving the quest in ''The Titan's Curse'' when Bianca didn't. Doesn't help that Thalia went on to become leader of the Hunters, which Bianca had joined before her death.
** Also averted in the case of [[spoiler:Annabeth dating his crush]]. He finds himself utterly unable to resent her, because she's always been kind to him.
* SixthRanger: Joins the crew of the Argo II and goes off with them to rescue Percy and Annabeth at the end of the third book.
* SociallyAwkwardHero: Being a child of the most antisocial god doesn't bless one with good social skills.
* ShamefulSourceOfKnowledge: He knows what a ''katobleps'' is because he had its Mythomagic card.
* ShipTease: Has this with [[spoiler: Will Solace, the head of the Apollo Cabin]] in the fifth book.
* StealthHiBye: Does this often, to the chagrin of his companions.
* SuddenlySexuality: [[spoiler: ''The House of Hades'' reveals that he had a crush on Percy that started in the previous series.]]
* SuperheroSpeciation: Had some instances of DishingOutDirt in the previous series (notably, splitting the ground open to swallow up some skeletons attacking Percy and throwing up a wall of black rock in the Labyrinth to stop some pursuers), but now that this is his sister Hazel's main ability, he sticks to his "god of death" skill set.
%%TroubledButCute
* WeDoNotKnowEachOther: To Percy, who barely buys it. When confronted, he states that it's not his place to help Percy remember who he is.
* WhyCantIHateYou: Feels this way about Annabeth, as she's both his [[spoiler: romantic rival]] and one of the people who's consistently nice to him.
%%WildCard
* WrongNameOutburst: Well, slip, anyway. He ''almost'' calls Hazel Bianca.
** He actually ''did'' call Reyna Bianca at one point.
[[/folder]]

[[folder:Reyna Avila Ramirez-Arellano]]

!!Reyna Avila Ramirez-Arellano

-->''"I mean to save this camp, Percy Jackson. Things are worse than you realize."''

A daughter of Bellona, Reyna and her sister Hylla were born in Puerto Rico to an affluent family. Through unfortunate circumstances they became employees of the sorceress Circe, seen in ''The Sea of Monsters''. After the spa is destroyed and she parts ways with her sister, Reyna joins Camp Jupiter and eventually becomes co-praetor alongside Jason. As leader of Camp Jupiter Reyna is wise and calm, but has been struggling with leading the camp by herself while trying to keep Octavian from gaining power. She puts the camp's welfare over that of her own, and judges people with how they can assist the camp.

As a daughter of Bellona, Reyna is skilled with weaponry and combat and can lend her strength to allies or followers. She fights with an Imperial gold spear and dagger.

----

* AbusiveParents: Apparently, her and Hylla's father was one, which was why they ran away from Puerto Rico to Circe's retreat.
* ActionGirl: As the daughter of a war goddess, she's very handy in a fight.
* AffirmativeActionLegacy: Puerto Rican.
* AloofDarkHairedGirl: Is described as tall and dark-haired, with a [[LadyOfWar mature and regal aura]] which she puts to good use as the leader of Camp Jupiter. Deconstructed as she has a DarkAndTroubledPast, so she puts up a mature facade and does not allow herself to show weakness in front her subordinates, as they look to her for guidance.
* AuthorityEqualsAsskicking: The praetor of Rome, as well as a spear-wielding badass.
* BadassCape: As praetor, she wears a purple one. You gotta look good when you're kicking ass.
* BadassFamily: She and her sister are daughters of the war goddess, Bellona. One of them at a time is awesome, but when they team up, monsters should run screaming.
* BaitAndSwitch: Her [[http://static3.wikia.nocookie.net/__cb20110830175434/olympians/images/b/b5/Reyna_full_body.jpg Official art]] makes her look almost like a villain.
* BigSisterInstinct: Develops this kind of relationship with Nico in ''Blood of Olympus'' during their quest. She even has to remind herself at one point that he isn't her little brother.
* BladeOnAStick: Her weapon of choice is an Imperial gold spear.
* BraidsOfAction: She wears her hair in a braid.
* BrokenBird: She's hardened from her past and not all too optimistic about herself, though she hides it with stoicism.
* CanineCompanion: She's got two dogs that accompany her around.
* ChekhovsGunman: While not named, she actually appeared as early as ''Sea of Monsters''.
* CoolBigSis: Eventually, she becomes an older sister figure for Nico during their quest with Hedge to deliver the Athena Parthenos.
* DespairEventHorizon: First she lost her home to and was imprisoned for months by pirates in Sea of Monsters, then was forced to go on the run with her sister, whom she eventually parted ways with. Which was bad enough. Then in ''Mark of Athena'', [[spoiler: after waiting for her love interest and best friend, Jason, to return to her and having to carry on the praetorship all by herself for ''eight months'', Jason coming home with a girlfriend in tow and war breaking out between the Greeks and the Romans within the same hour has pretty much destroyed Reyna's hope that anything good will ever happen to her again.]]
* {{Determinator}}: One of her best traits is her will to power through, and it's part of what makes her such a good leader (as she can pass this on to her followers). Despite losing nearly everything in ''The Blood of Olympus,'' she refuses to give up on her quest.
* GondorCallsForAid: Knowing that Camp Jupiter will soon be attacked, she tells Percy to find her sister Hylla and ask her to help.
* FriendlyEnemy: To Annabeth. They're similar in that they are determined, competent leaders who want the best for their camps, and they even seem to get along fairly well when interacting in ''The Mark of Athena'' before everything goes to hell.
* HeroicBSOD: [[spoiler:She suffers from this after seeing the ghosts at her old home in San Juan, right after being forced to leave Hylla behind to delay Orion]].
* HumanMomNonhumanDad: Inverted: Her mother is Bellona, the Roman goddess of war, while her father was a mortal soldier.
* LadyOfWar: Fits the personality traits, being calm, aloof, collected, and kickass with a spear. As a bonus, she's also the daughter of Bellona, the Roman goddess of war, specifically.
* TheLeader: As the praetor for Camp Jupiter.
* LivingLieDetector: They serve as this, too, which makes them very useful when she's interrogating someone.
** Her pegasus, Scipio, is one too. [[spoiler:Which makes it all the more tragic when he is killed in the fourth book.]]
* MeaningfulName: Her name, like the similar-sounding Spanish "Reina," is a derivation of the Latin "Regina" (queen, counsel), and actually does mean "queen" in Filipino. Fittingly, she's the regal "[[TheWomanWearingTheQueenlyMask queen figure]]" for Camp Jupiter.
* MyCountryRightOrWrong: Her loyalty is to Rome and Camp Jupiter above all else. When Octavian brands her a traitor for daring to go to the ancient lands she pushes through with her quest because it will benefit the camp.
* NervesOfSteel: She's very restrained, and works very hard not to let any disturbance she might feel show. Even when she's falling into an active volcano, she convinces Nico to shadow-travel them away and boosts his strength to do so.
* NonHumanSidekick: Her greyhounds, Aurum and Argentum. Their names are Latin for gold and silver, which aptly describe their colors and are the metals the dogs are made from.
* OneWomanArmy: Piper is convinced of this, at least.
* OnlyOneName: For the first three books, her surname isn't revealed at all. It's revealed she doesn't reveal it to just ''anyone''.
* ReasonableAuthorityFigure: Unlike Octavian, she's willing to listen to our heroes, and seems okay with negotiating for peace between the Greeks and Romans -- [[spoiler: until a possessed Leo fires on Camp Jupiter. Still, because of her tentative friendship with Annabeth, she doesn't skewer the protagonists on the spot, instead letting them proceed with their mission]].
* RomanticRunnerUp: [[spoiler:Jason gets together with Piper instead of her]], and although she doesn't openly bring it up, it's obvious she's not very happy about it.
* RulingCouple: She points out it might have happened with Jason if he stayed, then offers this to Percy.
* SelfMadeOrphan: [[spoiler: Her abusive father ended up becoming a ''mania'', a spirit of insanity. At one point he knocked Hylla unconscious with a chair, so Reyna grabbed the nearest weapon- an Imperial gold sword- and ended up 'killing' him to protect both herself and her sister. Reyna considers this to be {{Patricide}}, even when Nico tells her that dispelling a ghost is not the same thing as killing a man.]]
* TheStoic: As a leader of Rome, being serious and unemotional is practically hardwired into her.
* SuperEmpowering: As a daughter of Bellona, she can lend her strength to her allies and followers.
* SupportingLeader: Not in the main cast, but as the praetor she's supposed to lead the Romans.
* TookALevelInBadass: [[spoiler:A ''cape'' of all things does this in ''The Blood of Olympus,'' when the Athena Parthenos upgrades Reyna's cloak into an aegis.]]
* TheWomanWearingTheQueenlyMask: Has been carrying the leadership of Camp Jupiter on her own for the past eight months and is struggling under the weight of both protecting everybody from the monster attacks and fending off Octavian’s attempts at seizing the other praetorship.

[[/folder]]

!!Other Characters
Due to length, the rest of the cast[[note]]Including Gaia, the Giants, the Titans, all other monsters, the inhabitants of Camp Jupiter and Camp Half-Blood, the Gods and other auxiliary characters.[[/note]] has been moved [[Characters/TheHeroesOfOlympusOther here]].
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[[Literature/TheHeroesOfOlympus Return to The Heroes of Olympus'' page]].