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Characters who appear in ''Literature/PercyJacksonAndTheOlympians''. For tropes specifically applying to returning characters in ''Literature/TheHeroesOfOlympus'', see [[Characters/TheHeroesOfOlympus that character sheet]].



[[folder:Main Characters]]

!!Perseus "Percy" Jackson
--->''"Is he dangerous?"''
--->''"'''Very''', to his enemies."''

The son of Poseidon, god of the sea, and clear-sighted mortal Sally Jackson. The titular hero of the series, the books start in Percy's sixth grade year when he kills one of the Furies, masquerading as his pre-algebra teacher. Has a CoolSword, Anaklusmos ("Riptide") and later becomes the third person in history to bear the Curse of Achilles.

Played by Creator/LoganLerman in the film series.

* AchillesHeel: [[spoiler:The small of his back. Or, in a more figurative sense, Annabeth]].
* AnimalTalk: Can talk to horses and other vaguely equine beasts and sea creatures, since his dad made them.
* ApocalypseMaiden: As a candidate for the one in the prophecy to make a decision that will either save or destroy Olympus, he's considered so dangerous that the gods even discuss whether or not to kill him ''to his face''. [[spoiler:Subverted when it turns out he isn't the one in the prophecy--Luke is]].
* AuthorAvatar: Percy is an in-book avatar of Rick's son.
* AwesomeButImpractical: In the fourth book, he unlocks the power to create his own water: Awesome. He then uses it to create so much water he causes a volcano to erupt: Awesome. Doing this brings him to the point of near death and he has to spend two weeks being magically healed just to be able to stand again: Impractical. Not to mention he woke up Typhon.
* BadassAdorable: Moreso in his younger years when he was described as cute more than handsome, but he can act incredibly badass one moment before doing something completely {{Adorkable}}, especially around Annabeth.
* BadassInDistress: Occasionally, such as in ''The Sea of Monsters'' (he gets turned into a guinea pig). Annabeth is usually the one to bail him out.
* BadassLongcoat: Temporarily gains one during ''The Titan's Curse'', when the Nemean Lion skin becomes a duster.
* BattleCouple: He and Annabeth eventually grow into this.
* BatmanGambit: He basically gets Luke to admit that he poisoned Thalia's tree in front of Mr. D via Iris Message. It does end in an OhCrap moment and was a spur of the moment thing. It still counts since it relied on Luke to be a bragging {{Jerkass}}.
* TheBeastmaster: With sea beasts in particular, but thanks to his father he's great with horses, and he immediately bonds with a {{Hellhound}} upon confirming it is nice.
* BewareTheNiceOnes: Percy is easily one of the nicest characters in the whole series, but get him mad and he'll become easily one of the most vengeful.
* BigBrotherInstinct: Once he gets over the initial shock of their relation, he develops this towards Tyson. By the end of book 2, he's proud to let everyone know that Tyson is ''his'' brother, a contrast to his avoidance of the topic during the beginning of the book.
* TheBigGuy: Despite being TheHero, he serves as this during ''The Titan's Curse'', with his prowess at sword-fighting, low-scale invulnerability with the Nemean Lion coat, and BookDumb compared to the rest of the quest mates.
* BookDumb: He prefers to leave the deep thinking to Annabeth. For example, when UsefulNotes/FranklinDRoosevelt comes up in conversation, the only vaguely-related thing he can think of to say is "Like [=FDR=] Drive?"
* BullyHunter: Has a particular hatred for bullies, which he explicitly states in his narration in ''The Demigod Files''. In the normal world he frequently makes friends with the kids that get picked on (Grover and Tyson) and makes it his personal mission to protect them, even if it means he get's bullied as well.
* ChronicHeroSyndrome: Thanks in particular to his FatalFlaw.
* CluelessChickMagnet: Not even counting the throwaway characters who comment on his attractiveness, his three main love interests - [[OfficialCouple Annabeth]], [[WhatCouldHaveBeen Calypso]] and [[RomanticFalseLead Rachel]] - ''all'' have to make the first move on him or else they'd be waiting around forever. Percy's equally confused and surprised everytime.
* ComboPlatterPowers: Being the son of Poseidon, the sea god, Percy has water-based powers as one might expect. What one doesn't expect is the extent and ''variety'' of these powers. He can [[MakingASplash control water]], gains a HealingFactor and a power-boost when in contact with water (ocean water gives him the strongest effect), has SuperNotDrowningSkills plus complete immunity to the crushing water pressure on the ocean floor, [[SoftWater is able to negate all fall damage if he falls into water that is deep enough]], able to know exactly where he is when traveling on an ocean (down to the precise longitude and latitude), and is able to control whether or not he gets wet. Poseidon is also the god of earthquakes, a power which Percy uses to ''make a volcano erupt.'' [[ArsonMurderAndJaywalking And he can talk to horses.]]
* ContagiousHeroism: Percy often changes the people he meets for the better. For a few examples:
** Convinced Annabeth to open up to her family, as well as accept that she can't control everything.
** Often inspires Grover to be more brave and stubborn in regards to his ideals.
** Convinces Geryon's herdsman, Eurytion to treat the animals at his ranch better.
** Overcame Zoe's DoesNotLikeMen attitude.
** Made Ethan Nakamura betray Kronos.
** Consoled Hermes after [[spoiler: Luke's death]], with Hermes lampshading this trope and asking Percy to look after his other children.
* [[CoolBigSis Cool Big Bro:]] Eventually plays this role to Tyson, who looks up to him.
* CrouchingMoronHiddenBadass: Verges into BadassOnPaper territory, but Percy is constantly underestimated both as a fighter and a tactician due to his occasional idiotic antics and questions, despite consistently proving he is an expert in both.
* CursedWithAwesome: A self-inflicted example, when he signs up for [[spoiler: the curse of Achilles.]]
* DangerousSixteenthBirthday: His sixteenth birthday is the focus of the series, because it involves him either saving or destroying the world.
* DarkAndTroubledPast: Percy's stepfather Gabe was physically and verbally abusive, and he grew up with a learning disability, relatively poor, and without a lot of friends.
* DeadpanSnarker: Percy gets the award for being the most snarky in a WorldOfSnark. Even the ''chapter titles'' tend towards snark territory. It's suggested that his sarcasm is at least partially a coping mechanism for his abusive childhood.
* DontCallMeSir: He doesn't like it when various subjects of his father call him "lord." Blackjack, Percy's pegasus, still calls him "boss".
* EmbarrassingFirstName: His mother named him "Perseus" because it was one of the few ancient Greek myths that had a mostly-happy ending. See MeaningfulName below.
* FatalFlaw: Personal loyalty.
* FirstPersonSmartass: A first-person narrator prone to snarking at every out-of-the-ordinary thing he sees.
* GreenEyedMonster: Of Luke's history with Annabeth.
* GreenEyes: Described as sea-green.
* GuileHero: Though it's overshadowed by Annabeth, who uses this tactic more often, Percy is very capable of using his wits to get out of a situation. [[spoiler: One example is when he tricks Crusty (Procrustes) into laying down on one of his own beds, even though he knows that Percy saw him trap two people with them and now knows how to do so.]]
* HeroesPreferSwords: Percy's pretty terrible at anything ''besides'' the sword.
* HeroWithBadPublicity: Downplayed; it isn't so much that he has bad publicity as it is that people tend to call him out on his bad decisions or the the potential trouble he can make as the ApocalypseMaiden more than his accomplishments and heroic qualities.
** In fact it's so rare for him to get compliments that when his stepfather takes the time to commend Percy for his heroism and bravery, [[DeadpanSnarker Percy]] is genuinely speechless.
* HeroicSelfDeprecation: Percy hates thinking of himself as a hero, constantly injects pessimism and self-deprecation in his narration, and avoids the spotlight.
-->'''Percy's narration''': What was so great about me? A dyslexic, hyperactive boy with a D+ report card, kicked out of school for the sixth time in six years.
* HumanMomNonhumanDad: His mother Sally is a mortal, while his dad Poseidon is a god.
* HumbleHero: Downplays his increasing accomplishments as the series continues. [[spoiler: To the point of turning down ''godhood'' in the final book.]]
* ImprobableAge: He's been beating ''Gods'' and infamous monsters since he was twelve. Keep in mind that both in-universe and in the original Greco-Roman myths, demigods were (at the very youngest) in their late teens before they did things half as difficult.
* IncorruptiblePurePureness: Percy doesn't care about power, money, fame, or any other temptation that Kronos throws his way. At one point he had both Zeus's Master Bolt and Hades' Helm of Darkness in his possession and didn't even think of the immense power this would give him.
** Throughout the entire series, Percy is never tempted to make the choice to turn against the Olympians, even when they were being JerkassGods to him; the closes he ever gets is when he thinks about how releasing Hope from Pandora's Pithos would stop the war and bloodshed Kronos was causing.
* IndyPloy: It'd be faster to count the number of times his plans didn't boil down to "I'll figure something out, in the meantime, try not to get killed."
* InTheBack: [[spoiler: His (literal) AchillesHeel is the lower part of his back.]]
* KissingCousins: Subverted. He'd technically be this with Annabeth, but it's explained that gods don't have DNA, so there's nothing wrong with people from different cabins dating one another.
* LeeroyJenkins: Prone to blindly charging into battle, especially in the earlier books.
* LockedOutOfTheLoop: Chiron and Annabeth never seem to tell him anything.
* MakingASplash: Being Poseidon's son gives him water-based powers.
* MeaningfulName: Twice over.
** In-universe, his mother named him after one of the only Greek heroes to get a HappyEnding, knowing that he would need the extra luck in his life.
** Meta-textual, "Percy" taken from the Greek root can be translated to mean [[NamesToRunAwayFromReallyFast "the destroyer/to destroy".]] Highly appropriate for an antiheroic ApocalypseMaiden with great destructive power.
* MellowFellow: While he can definitely be HotBlooded and [[LeeroyJenkins impulsive]], on the whole Percy deals with the insane, otherworldly activities around him with a laid-back, joking attitude that belies the [[AngstWhatAngst insane amount of pressure and responsibility he has]].
* MommasBoy: He's very close to his mortal mother.
* TheNavigator: When he's on the ocean, at least. Since Poseidon is god of the sea, and patron of mariners, Percy has perfect navigation abilities while at sea. In a few books, this even extends to being able to recite the exact longitude and latitude of his current location.
* NiceGuy: Good-hearted and kind, snarkiness aside.
* NoTrueScotsman: Children of Poseidon doing less than stellar things often invokes this with him. He has a conversation with Poseidon about this in the fourth book.
* NotSoDifferent: With Luke-see the ForWantOfANail entry below. It takes him a while to acknowledge everybody who tells him this, given how much he resents Luke.
* ObliviousToLove: It takes him a ''long'' time to clock onto Annabeth's feelings for him, even though they're best friends and mutually crushing on each other for most of the series. Annabeth herself lampshades this in the Demigod Files:
--> Annabeth: ''He's so obtuse. That's the word. I mean he doesn't see really obvious stuff, like the way people feel, even when you're giving him hints and being totally blatant...."
* OlympicSwimmer: Thanks to his divine parentage, Percy's swimming skills are well into superhuman territory.
* OnlyKnownByTheirNickname: Virtually no one calls him Perseus, except for maybe a few monsters. Not even the ''big bad'' does. This is the reason he can tell monsters from normal people. They are the only ones to say "Perseus" when talking to him.
* RefusingParadise:
** Calypso, smitten with him, offers to let him stay on her island forever and live a carefree, idyllic life. He refuses because there's a world to save and a girl to return to, much to her heartbreak.
** [[spoiler: At the end of ''The Last Olympian'' he is offered godhood in exchange for his role in ending the Titanomachy. He declines in order to live a mortal life.]]
* ShowyInvincibleHero: Became this in the fifth book after [[spoiler:the Curse of Achilles makes him near-immortal]].
* SinsOfOurFathers: Pretty much every problem in his life can be traced to his father. From getting his troublemaker looks that get him branded as a rebel, to having his destiny tied to a prophecy of Doom, to even having his romantic life screwed up because his love interest's mother disapproves of his father. Aside from his powers, the only real benefit of having Poseidon as his father was that allowed him to find a place at Camp Half-Blood.
* SkunkStripe: In the third book, he gains a gray streak in his dark hair from [[spoiler:having to hold up the sky.]] ''Literature/TheHeroesOfOlympus'' establishes that it's faded.
* SoftWater: Along with SuperNotDrowningSkills. Not only can Percy ''always'' take a dive into water, from any height, to escape a bad situation (admit it, that's a handy thing to know), being submerged in water (more accurately, touching water in general, but it's strongest when he's submerged) heals and freshens him up, even to the point of detoxing any poison he's suffering from,; he doesn't even get wet unless he wants to. He can even use a lighter underwater. Being the son of the sea god has its perks.
* StockShonenHero: Brilliant at his universe's SeriousBusiness (Monster-Slaying)? Check. Extremely kindhearted? Check. Energetic? He's got [[AttentionDeficitOohShiny ADHD]] to prove it. Believes in TrueCompanions? Check. IdiotHero? Check. Strong sense of justice, mercy, and fairness? Check.
* SweetTooth: His favorite food is "anything blue and sweet", understandable, since his mom used to work at a candy store and brought home lots of free samples.
* TiredOfRunning: After spending the entire first book being taunted, intimidated, and forced to run, he ''finally'' gets to stand his ground, and against [[WarGod Ares]] no less.
* UnderwaterKiss: [[spoiler:In ''The Last Olympian'' with Annabeth.]]
* UpbringingMakesTheHero: Heavily implied. Several times he is faced with a hard decision that he only overcomes by thinking of how his mom will react if he takes the bad decision.
* UndyingLoyalty: His FatalFlaw is said to be his loyalty to his friends.
* UnskilledButStrong: At the beginning of the series he was shown to have incredible power but little control or skill.
* VitriolicBestBuds: With Annabeth initially.
* WellDoneSonGuy: He's kind of a sucker for his dad's good opinion.
* WickedStepmother: Unlike Nico and Thalia, this is averted for him. While Poseidon's wife Amphitrite understandably acts coldly towards him (Percy was born after Poseidon swore to never have another demigod child), she isn't really the jealous type, bakes him cookies, and doesn't get mad if he leaves his clothes on the floor. Percy says that's all you can ask of an immortal stepmom. [[DomesticAbuse His stepfather, on the other hand....]]
* WildCard: As a child of Poseidon, it is stated in-universe that he is naturally this. Pretty much the only thing his enemies can predict about him is that he will go out of his way to rescue his friends.
* WillTheyOrWontThey: With Annabeth. [[spoiler:TheyDo at the end of ''The Last Olympian''. Even their fellow ''campers'' thought it was about time already]].
* TheWoobie: The sheer amount of crap he goes through will have you want to give him a hug by the end of just the first book. In a five book series.
* YouAreNotReady: It's shown as far back as the ending of book three when he tries to fight Atlas, but when he fights a newly resurrected Kronos, it becomes clear that Percy is now out of his league whenit comes to enemies. So Nico suggests he TookALevelInBadass by [[spoiler: swiming in the Styx]].

!!Annabeth Chase
--->''"Athena always has a plan."''

The heroine of the series and the resident [[TheSmartGuy brainiac]], Annabeth is the ''literal'' brainchild of Athena and military historian Frederick Chase (kids of Athena are just special that way). Her pastimes include architecture, Ancient Greek, killing monsters, and practicing how to stab things. Annabeth ran away from home when she was seven and met up with Thalia and Luke; eventually they made their way to Camp Half-Blood, but lost Thalia in the process.

Played by Creator/AlexandraDaddario in the film series.

* ActionGirl: Can kick a lot of ass, and is a more experienced warrior than Percy.
* AdaptationDyeJob: Described as having blond hair and GrayEyes in the book, but the movie gives her [[BrainyBrunette brown hair]] and blue eyes.
** For the sequel, they're reverting to her book hair color.
* AscendedFangirl: Wants to be an architect and build monuments that will last for eons. [[spoiler:In the final book, she gets her wish when she's chosen to redesign Olympus]].
* BadassBookworm: Loves learning as Athena's daughter, but is still capable of being a competent ActionGirl.
* BadassInDistress: In ''The Titan's Curse''. Not for very long.
* BadassNormal: Comparatively. She has zero supernatural powers but holds her own in fights as well as Percy.
* BattleCouple: With Percy.
* BettyAndVeronica: The Betty to Rachel's Veronica.
* BrokenBird: Due to the trauma about losing Thalia, and then Luke.
* ChekhovsGun: [[spoiler: Her knife is used by Luke to kill himself to force Kronos to leave his body.]]
* CompositeCharacter: The first film's version of Annabeth is a combination of book Annabeth and Clarisse.
* DefrostingIceQueen: Starts out as very aloof at the beginning of the first book, but she slowly warms up to Percy and reconnects with her family.
* DropTheHammer: She used one as her first defense against monsters before she met Luke and Thalia.
* DumbBlonde: {{Inverted}}. Don't let her hear you insult her intelligence, either. [[ActionGirl She will gut you.]]
* FatalFlaw: [[{{Hubris}} Pride]]. Annabeth's problem is thinking that she can do anything, even when she can't, and, by extension, holding onto impossible goals. She thinks that she can solve every problem that she has, including that of her distant mother and traitorous friend. Because she thinks that she can fix these problems, she never really lets them go and moves on. [[spoiler: This is why she takes the sky from Luke in Titan's Curse, despite it having 'bad idea' written all over it]], among other things.
* FirstGirlWins: If you exclude [[TheBully Nancy Bobofit]], who doesn't show up after the first few chapters, Annabeth is the first named girl Percy meets.
* GirlsLoveStuffedAnimals: One of the contents of her trunk, along with various survival gear, her Yankees cap and Daedalus' laptop, is a teddy bear. (Don't tell anyone!)
* GrayEyes: Inherited from her mother, Athena.
* GreenEyedMonster: She's pretty obviously jealous of Percy's friendship with Rachel.
* HotScientist: Architecture is her dream. In the fifth book (the same one where Percy describes her as beautiful), [[spoiler:she gets tasked with rebuilding and redesigning Olympus.]]
* HumanMomNonHumanDad: Inverted; her mother is a goddess and her father is a mortal.
* InsufferableGenius: In the early books, she was an extreme know-it-all. She matures by the fifth.
* InTheBack: Saves Percy from [[spoiler:Kelli]] by stabbing her in the back with her knife.
* InvisibilityCloak: A gift from her mother, a Yankees baseball cap can turn her invisible.
* KissingCousins: Subverted. Percy and Annabeth are technically second-cousins, the gods have no DNA to speak of and as such, Percy and Annabeth are not biologically related.
* KnifeNut: Her weapon of choice is a knife; for [[TheSmartGuy clever fighters]] only. [[spoiler: The knife was a gift from Luke many years ago.]]
* TheLancer: To Percy.
* LikeBrotherAndSister: Annabeth had always had a soft spot for Luke since [[PrecociousCrush she was a child]], but in the end, [[spoiler:they come to terms that they only see each other as brother and sister.]]
* LoveRedeems: Convinced to the end that she can reawaken the good in [[spoiler:Luke]], and motivated by her history with him. [[spoiler: It works, but [[LikeBrotherAndSister not with the kind of love she expects]].]]
* MoralityPet: For [[spoiler:Luke,]] she's the only one who the character seems to retain any humanity towards.
* MementoMacGuffin: Her knife, which she received from [[spoiler:Luke]] when they first met.
* NiceHat: Her Yankees baseball cap, which can make the wearer invisible.
* PluckyGirl: After her smarts, her unyielding determination is probably her most notable quality.
* ThePollyanna: To some extent. She's well-aware that the world is not perfect, but it's her dream try to fix that, which is why she wants to be an architect. This is also shown with how she's convinced she can make Luke good again.
* PrecociousCrush: On Luke, when she was younger.
* RestoredMyFaithInHumanity: [[spoiler:For Luke]].
* TheRunaway: Ran away at the age of seven, falling in with Thalia and Luke whom she grew to consider her family.
* [[TheSmartGuy The Smart Girl]]: Hello, her mom's the goddess of ''wisdom''.
* TeenGenius: Being a child of Athena, she is inherently smart. [[spoiler:Her dream is to become an architect. At the end of the fifth book, she gets her wish - she gets to redesign Olympus.]]
* {{Tsundere}}: Type A, all the way. [[spoiler:Even at the end while making out with Percy.]]
* WeUsedToBeFriends: With Luke.
* WillTheyOrWontThey: With Percy. [[spoiler: They Do....''eventually''.]]
* WhyDidItHaveToBeSnakes: Annabeth ''does not like spiders'' (explained by the story of Arachne) and the feeling is apparently mutual. [[spoiler:Having to chase a mechanical spider through the Labyrinth was not her favorite thing ever.]] This aracnophobia and hatred stretches to all children of Athena.
* WomenAreWiser: When it comes to Percy at least. Justified since she is the daughter of Athena.
** With that said, it is given a twist in that while Annabeth is certainly smarter and wiser than Percy, she is also more jaded and prideful, whereas Percy is an IdealHero who isn't so much stupid as he is impulsive, unfocused, and [[UndyingLoyalty stupidly loyal]]. Also, there have been times when Percy was able to come up with ConfusionFu style strategies Annabeth never would have thought of.
** And on top of all that, when it comes to their adventures, they are both presented as being equally important to any quest's success and both would probably die without the other.

!!Grover Underwood

A satyr and Percy's best friend, Grover is the Searcher sent to Yancy Academy to keep an eye on Percy. He leads Percy to Camp Half-Blood and joins him on each book's quest (except the second, where the object is to rescue him). His dream is to find the lost god of the wild, Pan. [[spoiler:He eventually does. Just in time to watch Pan die.]]

Played by Brandon T. Jackson in the film series.

* AdaptationalBadass: In the films. He's adept at CaneFu and personally defeats the Hydra with Medusa's head.
* BetaCouple: With Juniper.
* BrownEyes: Representing his connection with nature.
* ButtMonkey: Mostly in ''The Lightning Thief'', though he still has moments later on in the series. He simply can't seem to catch a break.
* CaneFu: Quite adept at using his crutches as blunt weapons in the films, as Gabe and some guards at the Lotus Casino find out the hard way.
* CowardlyLion: He's relatively small for his size, easily frightened, constantly complains about going into dangerous situations, but will literally go to hell and back for his friends.
* TheChosenOne: [[spoiler:A variant. In ''Battle of the Labyrinth'', Pan states that he specifically chose Grover to deliver the message of his death to the world]].
* CurtainsMatchTheWindow: Brown hair and brown eyes.
* DisabilitySuperpower: Not really but he presents as this, using crutches when among {{muggles}} to disguise his goat-legged gait.
* DistressedDude: In ''Sea of Monsters''.
* ExtremeOmniGoat: Well, omni-satyr. Grover will eat anything.
* FriendToAllLivingThings: Comes with the territory.
* GreenThumb: Melodies played on his reed pipes can make plants grow.
* HesJustHiding: In-universe, he does not believe Pan dead and his main motivation is to gain a Seeker's license so he can search for him. [[spoiler:He's right, and he does find Pan...in time to see him actually die.]]
* {{Herald}}: He's the one who reveals the existence of the mythical world to Percy.
* HeterosexualLifePartners: With Percy, they share an empathy link.
* IneptMage: At first, he grows more into his power as the series progresses.
* InterspeciesRomance: Technically with ''a tree''. In mythology, though, Juniper is a Dryad, and nymphs are often considered to be the female version of a satyr.
* MagicMusic: His music can cause plants to grow.
* NiceGuy: He remains kind, caring, and protective despite being the resident ButtMonkey.
* PluckyComicRelief: More so earlier on before the series gets DarkerAndEdgier, but the series still manages to get a few jokes in at his expense.
* RaceLift: Is black in the movie when official art depicts him as a pale redhead.
* ThrowTheDogABone: In ''The Last Olympian'', [[spoiler: he's made a Lord of the Wild and gets a position on the Council]].
* TookALevelInBadass: Goes from being the unquestionable ButtMonkey in ''The Lightning Thief'' to being a competent member of the good guys' team whose skill set complements the more action-oriented demigods.
* TrademarkFavoriteFood: Enchiladas. [[ExtremeOmnigoat And tin cans]].
* TheUnfavourite: The Council of Cloven Elders has a very strong dislike for Grover out of all their satyrs, particularly after book four.

!!Luke Castellan
Son of Hermes and May Castellan. When he was an infant, his mother tried to become the new host for the Oracle of Delphi. It went horribly wrong. May [[GoMadFromTheRevelation went crazy]] [[MadOracle from visions of her son's eventual future]] and became TheOphelia, and spent Luke's childhood babbling at him about his horrible fate. He ran away and met up with Thalia and Annabeth; they eventually made it to Camp Half-Blood, but not before Thalia [[HeroicSacrifice died]]. Luke went on a failed quest and came back with [[GoodScarsEvilScars a scar]]. [[spoiler: He is a major villain in the series, second only to Kronos, attempting to destroy the gods for their manipulation and abuse towards him.]]

Played by Jake Abel in the film series.

* TheAce: Good looking, charismatic, a good fighter, and his cabin's counselor.
** BrokenAce: And by the time we meet him, he's jaded, unhappy, and desperately craves affection from his aloof father.
* AlwaysSomeoneBetter: To Percy.
* {{Antivillain}}: Gradually revealed to be this as the series goes on and his more [[EvenEvilHasLovedOnes redeeming qualities]] and [[WoobieDestroyerOfWorlds tragic backstory]] come to the surface.
* BrokenBird: RareMaleExample. His hatred of the gods stems from his own bitterness after being basically abandoned by his father his entire life.
* BelatedBackstory: Until the fifth book, all we know is that his dad sent him on the quest where he got his scar, and he hates him for it.
* BigBad: [[DragonInChief He's effectively this]] for the first two books, as [[GreaterScopeVillain Kronos]] is at that point SealedEvilInACan and none of the higher-ranking Titans show up until the third.
* BigBrotherMentor: To Percy in book one. Implied to have been one to Annabeth too.
* BigManOnCampus: Seemed to be this before betraying the camp -- he was counselor of the Hermes cabin, attractive, relatively popular, and a BigBrotherMentor to Percy.
* CallingTheOldManOut: He's pretty pissed at Hermes, not gonna lie.
* TheChosenOne: [[spoiler: He is "the hero" described in the Great Prophecy, not Percy.]]
* CoolSword: Backbiter. [[spoiler: Doubly deadly due its being fashioned out of both celestial bronze and steel, meaning it can kill both mortals and gods.]]
* DarkMessiah: Definitely twisted and evil as well as basically Kronos's champion, but [[spoiler: eventually saves the world.]]
* DrivenToSuicide: For a good cause. See HeroicSacrifice below.
* DrivenToVillainy: His bitterness at his father and the treatment of those in the Hermes cabin drive him to betray the camp.
* DemonicPossession: [[spoiler: Reluctantly allows Kronos to possess him as the last resort for Kronos's resurrection.]]
* TheDragon: Kronos' right-hand demigod and primary agent. He also serves this role to Atlas during ''The Titan's Curse''.
* DyingAsYourself: [[spoiler: As Luke, not Kronos.]]
* FaceHeelTurn: Goes from friendly, if somewhat aloof, mentor character to Percy to one of the major antagonists in the series. [[spoiler:And back again, if only [[DyingAsYourself for a few moments]].]]
* FallenHero: After joining Kronos.
* ForWantOfANail: He and Percy are this to each other. They're both sweet, compassionate fighters who become highly admired by their colleagues. Both are proficient swordsmen, handsome, and both consider Annabeth to be one of the most important people in their lives. They even have similar [[InnerMonologue narrative voices]], as demonstrated by his first-person short story in ''The Demigod Diaries''. The divergence hits with their mothers. [[spoiler: Luke's mother was tragically driven insane when she attempted to channel the spirit of the Oracle of Delphi and spent most of his childhood babbling at him about [[SelfFulfillingProphecy his awful fate]], leaving him scared, resentful, and starved for affection. His anger towards the gods was only increased by a quest that left him scarred and mostly ignored by the gods, including his father. He lashes out towards the manipulation by trying to unseat them and almost brings about the end of the world.]] By contrast, Percy is closer to his mother than anyone, and it's heavily implied she taught him everything he knows about kindness, morality, and love.
* FreudianExcuse: Once you find out his backstory in ''The Last Olympian''. [[spoiler:His mother's kind of crazy and his father's distant, driving him to run away]].
* GoodScarsEvilScars: He has a scar over the right side on his face and as the series progresses, it becomes more prominent. Percy states it looks fresh by the last book, [[NothingIsScarier though it's never explained why.]]
* TheHeavy: For the first four books in the series until [[BigBad Kronos]] [[SealedEvilInACan breaks free from his can]] [[spoiler:and takes possession of Luke's body]].
* HeWhoFightsMonsters: Started out on the good guys' side, but eventually his resentment against the Olympians drove him to Kronos's side.
* HeroicSacrifice: [[spoiler: Stabs himself in the side to save Olympus.]]
* HeroicWillpower: [[spoiler: Throws off Kronos' possession long enough to apologize to Annabeth and complete the above sacrifice.]]
* HoneyTrap: [[spoiler:For Silena; he seduced her and set her up as TheMole, a decision she later comes to regret.]]
* HumanMomNonhumanDad
* ICannotSelfTerminate: [[spoiler:A special case, in that he can self terminate, he just needs Percy to give him a knife.]]
* IcyBlueEyes: Percy describes them as "piercing."
* IKnowYouAreInThereSomewhereFight: [[spoiler:With Annabeth during ''The Last Olympian''.]]
* LikeBrotherAndSister: He sees Annabeth as a little sister.
* LivingBodysuit: [[spoiler: To Kronos after the latter possesses him.]]
* LoveRedeems: [[spoiler: In the end, his love for Annabeth drove him to perform his HeroicSacrifice.]]
* MeaningfulName: A castellan is the noble tasked with defending a castle. [[spoiler:So who's the one who ultimately protects Olympus?]]
* MyGodWhatHaveIDone: In ''The Last Olympian'', when he realizes [[spoiler:he's hurt Annabeth and broken his promise to her.]]
* PromotedToParent: For Annabeth when they were on the run.
* RageAgainstTheHeavens: He wants to resurrect Kronos in order to destroy the gods.
* RedemptionEqualsDeath: [[spoiler:Kills himself in order to defeat Kronos, who his body has been jacked by, and save the world.]]
* ShipTease: With Thalia in ''The Titans Curse'' and ''The Diary of Luke Castellan.''
* SoulJar: For [[spoiler:Kronos.]]
* SupernaturalGoldEyes: [[spoiler: When possessed by Kronos]].
* TragicHero: He UsedToBeASweetKid, but his bitterness from being abandoned by his father Hermes drove him to betray his friends at Camp Half-Blood and plan to destroy the gods.
* UsedToBeASweetKid : Evident in his diary. [[TearJerker He sounds a lot like Percy.]]
* WellDoneSonGuy: [[WhamLine "You said they cared about me!"]]
* WeUsedToBeFriends: He was popular and well-liked in the camp before his turn to evil, and this dynamic is especially pronounced in his interactions with Thalia and Annabeth (with whom he shares history) and Percy (who saw him as a BigBrotherMentor).
* WillingChanneler: Kronos coerces him into submitting to possession.
* WoobieDestroyerOfWorlds: To the point when even the victims of his nefarious acts (Silena, Thalia, Annabeth) show compassion for him and want to help him. Even Percy, who out right resents him feels bad for the guy in the end.
* WorthyOpponent : To Percy



[[HeroicBastard Sons and daughters]] of the Greek gods. They have heightened senses and combat skills that take the form of [[AttentionDeficitOohShiny ADHD]] and their minds are hard-wired to read Ancient Greek, which gives them [[LIsForDyslexia trouble reading English]]. [[SuperpowerfulGenetics Their skills]] and [[GenerationXerox personalities]] are inherited from their divine parents (children of Aphrodite will be [[LoveFreak Love Freaks]], children of Athena will be [[BadassBookWorm highly intelligent]], and children of Apollo will be musically and/or medicinally inclined, as well as a good shot with a bow).

* AttentionDeficitOohShiny: Thanks to their combat skills.
* AgeLift: Applies to the major characters in the film series; instead of being 12-13 in the first book, they are in their late teens in the first film.
* {{Bastard Bastard}}s: Played with in the evil demigods, most of them are fiercely loyal to their mortal parent but not to the rest of the Olympians, believing they mistreated their mortal parent.
* TheBeautifulElite: Aphrodite's children especially, although it's implied that this applies to most, if not all, the demigods due to their divine heritage and the gods' propensity for attractive partners.
* TheBully: The children of Ares are invariably portrayed as this, as well as having [[JerkAss callous personalities]] and [[TroublingUnchildlikeBehavior a disturbing affinity for violence and killing]]. (Its implied that many serial killers and {{Sociopathic Soldier}}s are children of Ares).
* ChildSoldiers: Most of them are between the ages of 12 and 20. Though its somewhat subverted in that they are trained for their ''survival'' as oppose to being trained as soldiers. The children of Ares are literally born as this.
* GangOfHats: As stated below, each demigod shares some parental-domain-related power with their half-siblings - Aphrodite's children are all ridiculously gorgeous, Hephaestus's children are good with machinery, etcetera.
* GreenThumb: Demeter's children. Dionysus' twins, too - they work best with grapes, but since their dad isn't allowed to touch anything vaguely related to wine, they settle for strawberries instead (just them ''walking'' among the strawberry fields makes them of better quality already.)
* [[HeroicBastard Heroic Bastards]]: The heroic demigods, anyway, since no one's godly and mortal parents are married.
* HumanMomNonHumanDad: Played straight or inverted with the demigods' parentage.
* ImprobableAimingSkills: Apollo's sons and daughters are good at archery.
* LIsForDyslexia: Brains are hard-wired for Ancient Greek.
* [[TheMedic The Medics]]: Apollo's kids, thanks to their father.
* NeurodiversityIsSupernatural: Their [=ADHD=] is due to their bodies acting on combat instinct while their dyslexia is due to being hardwired for Ancient Greek.
* SuperpowerfulGenetics: Powers relating to the domains of their divine parentage. For example, Demeter's children will have {{Green Thumb}}s, and Athena's children will be crazy-smart.
* SupremeChef: Demeter's children; it's part of their mother's domain.
* TeenGenius: Children of Athena and Hephaestus. Athena kids are wise and spend their time reading and researching, while Hephaestus kids are good with machinery.
* WrenchWench: Daughters of Hephaestus are just as good with mechanics as his sons.
* YouCantFightFate: A running theme of the series, justifiable given its origins. However, prophecies being what they are, it's terribly easy to misinterpret one's fate.

!!Clarisse La Rue
Daughter of Ares and head counselor of Cabin Five, Clarisse frequently bullies new campers and her first appearance involves trying to shove Percy's head in a toilet. She and Percy never get along, but they do develop respect for one another.

Played by Leven Rambin in the film series.

* AchillesInHisTent: In a particularly brilliant HistoryRepeats example, Clarisse refuses to let the Ares campers refuse to join the Battle for Manhattan because they believed they deserved a chariot they and the Apollo campers had been fighting over (which eventually went to the Apollo cabin). Just when they're on the losing side, [[spoiler:Silena impersonates Clarisse and leads them into battle, getting killed in the process.]] Hence her subsequent RoaringRampageOfRevenge. Guess who did this before? [[spoiler:Achilles, after his beloved best friend/cousin Patroclus's death.]]
* ActionGirl: She isn't the head counselor of the war god's cabin for nothing.
* AdaptationalAttractiveness: Percy doesn't describe her as particularly attractive in the books, while the graphic novel depicts her as something of a BrawnHilda. In the film, she's played by Leven Rambin, best known for playing the stunningly beautiful Glimmer from ''Film/TheHungerGames''.
* AnimalMotifs: [[FullBoarAction The boar]] and, less flatteringly, [[BrawnHilda the]] [[ThePigpen p]][[FatBitch i]][[GassHole g]].
* BadassBoast: "I AM CLARISSE, [[spoiler:DRAKON-SLAYER]]! I will kill you ALL!"
* TheBigGirl: Of all the female characters in the series, Clarisse is the most adept at physical combat, thanks to her masculine physique.
* BladeOnAStick: Her WeaponOfChoice is a barbed spear that electrocutes its targets.
* BloodKnight: Takes after her papa.
* BoyishShortHair: Hacks off most of her hair during her quest in ''The Titan's Curse'', though she grows it back out in ''The Battle of the Labyrinth''.
* BrawnHilda: She has the body of a huge, musclebound, size XXXL male rugby player, thin stringy-looking hair, foul body odor, and (if Percy's "female(ish)" comment in ''The Demigod Files'' is anything to go by) a rugged, manly face.
* TheBully: Initially. She begins to mellow down as the series goes on and she gets a boyfriend.
* CoolHelmet: Wears a uniquely boar-shaped helmet, presumably to symbolize her status as head counselor of the Ares Cabin. [[spoiler: It becomes a plot point later when Selena impersonates Clarisse to lead the Ares Cabin into battle.]]
* FaceOfAThug: She's ''huge'', built like a swole man, and has a brutish, manly face that is heavily scarred and only capable of emoting "evil sneer[s]". She's also [[NiceGirl Silena Beauregard]]'s best friend and nursed [[SatelliteLoveInterest Chris Rodriguez]] back to (physical) health after rescuing him from the Labyrinth.
* FullBoarAction: Owns a set of boar-themed armor with an [[CoolHelmet appropriately-shaped helmet.]]
* GagNose: Has a huge, aquiline nose in the graphic novels.
* GlorySeeker: Seeks fame and glory, much like Ares's WarIsGlorious mindset.
* HiddenDepths: She turns out to be a JerkWithAHeartOfGold. She's also secretly afraid of disappointing her father, as shown in ''The Sea of Monsters''.
* HistoryRepeats: See AchillesInHisTent above.
* HumanMomNonhumanDad: Her father's Ares so her mom is presumably a mortal woman.
* HumanPopsicle: [[spoiler:For a short while during the battle of Manhattan.]]
* ICallItVera: She calls her second electric spear "Maimer". (Everyone else calls it "Lamer".)
%%* JabbaTableManners
* JerkJock: Initially, she's the brawny kind who stuffs peoples' heads down toilets.
* JerkWithAHeartOfGold: [[CharacterDevelopment Matures]] into this around the fourth book.
* TheLadette: She just as tough, possibly even more, than the other sons of Ares.
* LadyLooksLikeADude: Implied in the books. The graphic novel takes this UpToEleven to the point that her face is indistinguishable from an adult man's in close-up shots, minus the facial hair.
* LargeHam: Clarisse would like you to know that she is CLARISSE, [[spoiler:DRAKON-SLAYER]]!
* MusclesAreMeaningful: Unlike the slender-yet-toned Annabeth and Thalia, Clarisse is introduced as the resident FatGirl with StoutStrength who builds up muscle mass during the last two books. By the start of ''The Last Olympian'', she's "as big and beefy as a [male] rugby player" and has the athleticism to match.
* OddFriendship: With Silena.
* OfficialCouple: With Chris.
* OOCIsSeriousBusiness: In book 5, she is so angry at the Ares cabin being dissed that she and her cabin refuse to join the other demigods in defending Olympus. We repeat: ''[[BloodKnight Clarisse]] refused to join what could have possibly been the biggest and most monumental battle of her life.''
** Her refusal to go on the quest immediately informs the characters and the readers just how terrifying the labyrinth is.
* PetTheDog: Her concern for and friendship with Chris and Silena.
* PutOnABus: Mostly absent from the events of ''The Titan's Curse''.
* RedIsHeroic: Subverted. She wears bright red armor and is one of the best fighters at Camp Halfblood but is (to everyone not named Chris or Selena) a selfish {{Jerkass}} bully who at her worst will abandon her allies for the sake of pride or glory.
* RedOniBlueOni: She's the red oni any time she works with anyone else, period. Which is not often.
* TheRival: To Percy.
* RoaringRampageOfRevenge: [[spoiler:When the Drakon fatally wounds Silena.]]
* ShockAndAwe: Likes to use electric spears in combat.
* StoutStrength: Implied to be obese in the first book and has "hands like iron" (referring to her grip strength); even after building up muscle over the course of five books, she's still more burly than ripped.
* TomboyAndGirlyGirl: Tomboy to Silena's girly girl.
* WellDoneSonGuy: Like Percy, she's a sucker for her father's good opinion.

!!Chris Rodriguez
Son of Hermes and boyfriend of Clarisse. He's introduced as working on Luke's side and having gone insane when he went on a mission into the Labyrinth, but Dionysus heals him at the end of ''Battle of the Labyrinth''.

Played by Grey Damon in the film series.

* AllThereInTheManual: According to ''The Ultimate Guide'', he's a son of Hermes.
* HeelFaceTurn: He was on Luke's side until he went into the Labyrinth.
* MoralityPet: One of two people (the other being Silena) Clarisse shows a softer side to.
* NiceGuy: In contrast to [[JerkWithAHeartOfGold Clarisse]].
* OfficialCouple: With Clarisse.
* SatelliteCharacter: He's only relevant because of his relationship with Clarisse.

!!Silena Beauregard
Daughter of Aphrodite, ergo stunningly beautiful and [[LoveFreak in love with love]]. Extremely talented with handling [[CoolHorse pegasi.]] Hooks up with Beckendorf between the fourth and fifth books.

* AntiVillain: [[spoiler:In the final book, she turns out to be TheMole for Kronos, but only because she'd been charmed by Luke into telling him everything and then blackmailed into keeping it a secret]].
* TheBeastmaster: Pegasi, although we never see her use it in an actual fight.
* BerserkButton: [[LoveFreak Children of Aphrodite]] don't usually participate in capture the flag. But when it's against [[DoesNotLikeMen the Hunters]]...
--> "I'll show them 'love is worthless'. I'll pulverize them!"
* DeathByDisfigurement: [[spoiler: Her face is burned off by acid.]] ''Ouch'', Silena.
* DeathByIrony: A daughter of Aphrodite [[spoiler: dies as a result of horrific acid burns]].
* ElCidPloy: [[spoiler:Disguises herself as Clarisse in order to fool the Ares cabin into fighting in the war. It works, but at the cost of her own life.]]
* GoOutWithASmile: [[spoiler: She dies with a smile on her face, thinking of Beckendorf.]]
* HardWorkHardlyWorks: For all the combat training they go through at Camp, Silena's not that great in a fight. Attributed to her being a daughter of Aphrodite.
* HeroicSacrifice: As mentioned, she sacrificed her life to trick the Ares cabin.
* HighHeelFaceTurn
* HistoryRepeats: [[spoiler:Fulfills the Patroclus role in the Trojan war. See AchillesInHisTent above for elaboration.]]
* HumanMomNonHumanDad: Inverted; her mother is a goddess while her father is a mortal.
* KilledMidSentence: [[spoiler: Manages to eke out "See Charlie..." just before dying.]]
* LovableAlphaBitch: Head counselor of the Aphrodite cabin and daughter of a rich man, yet Percy describes her as one of the nicest Aphrodite girls.
* LoveFreak: Comes with being a daughter of the love goddess.
* MeaningfulName: Although it literally translates as "handsome gaze", her name means "regarded highly".
* TheMole: [[spoiler:She was the reason Kronos knew exactly what Camp Half-Blood was planning: she had been charmed by Luke into telling him everything.]]
* NeatFreak: The Aphrodite cabin is always spotless.
* NiceGirl: Nice and amiable to everyone, in contrast to the other Aphrodite girls.
* OfficialCouple: With Beckendorf.
* RedemptionEqualsDeath: [[spoiler:She dies and is remembered as a hero, despite being TheMole the whole time]].
* SpoiledSweet: Her father owns a chocolate factory, which is what attracted Aphrodite.
* TomboyAndGirlyGirl: The girly girl to Clarisse's tomboy.

!!Charles Beckendorf
Son of Hephaestus and constantly hanging out in the camp's metal forges. Can build bombs.

* AffectionateNickname: His girlfriend calls him "Charlie."
* TheBigGuy: Expected from a son of Hephaestus.
* BlackGuyDiesFirst: [[spoiler:The first half-blood to die in ''The Last Olympian.'']]
* BrotherSisterIncest: Averted in the case of his and Silena's relationship, considering the fact that in the fifth book, it is explained that gods do not have DNA, and thus makes any arguments against inter-camp relationships null and void; with the one exception of two people from the same cabin.
* FatalFamilyPhoto: [[spoiler:He just had to show off a picture of his girlfriend right before he raids the Princess Andromeda...]]
* [[CoolBigSis Cool Big Bro]]: To Percy. He's older and an experienced demigod, but has no problems befriending Percy. Unlike Luke, he remains this trope throughout the series.
* GadgeteerGenius: As a son of Hephaestus, he's very talented with machinery.
* GeniusBruiser: As a son of Hephaestus, Beckendorf has mad engineering skills.
* GentleGiant: Large and well-built, but a down-to-earth NiceGuy.
* HeroicSacrifice: [[spoiler: Blows himself up in order to land a hit on Kronos.]]
* HumanMomNonhumanDad: His dad's Hephaestus, so his mom is presumably a mortal woman.
* LastNameBasis: Is referred to as Beckendorf by virtually everyone (except Silena).
* NiceGuy: One of the friendliest camp counselors, and looked up to by everyone.
* OfficialCouple: With Silena.
* {{Outgambit}}: [[spoiler:He manages to play ''Kronos'', the BigBad, like a fool. Beckendorf my man, you get mad props for that.]]
* TheQuietOne: Percy notes that Beckendorf was a guy of little words, but when he spoke everyone tended to listen and respect what he was saying.
* SacrificialLion: [[spoiler:Killed to show just how dead serious Kronos and co. are.]]
* ScaryBlackMan: A heroic version; Percy describes him as the type that monsters would run from.
* TogetherInDeath: [[spoiler:With Silena.]]

!!Connor & Travis Stoll
Sons of Hermes--not twins, but a year apart. They succeed Luke as co-counselors of Cabin Eleven and the main pranksters of Camp Half-Blood.

* HumanMomNonhumanDad: Their dad is Hermes, so their mom is presumably a mortal woman.
* MeaningfulName: Lampshaded: their father is the god of thieves and their last name is ''Stoll''(not that they got the joke).
* {{The Trickster}}s: Just like their father, the god of thieves.
* ThoseTwoGuys: Always around to comment on the camps' goings-on.

!!Thalia Grace

Daughter of Zeus and an eighties starlet with a poofy hairdo. Her birth broke the pact the Big Three had made after World War II to never have children again. She ran away from her alcoholic mother when she was younger, met up with Luke and eventually Annabeth, and made her way with them to Camp Half-Blood. There they were overwhelmed by monsters and Thalia stayed behind to hold them off, dying in the process. Zeus turned her body into a pine tree.

Played by Paloma Kwiatkowski / Katelyn Mager (young) in the film series.

* AbusiveParents: To say nothing of [[ParentalAbandonment Zeus' abandonment]], Thalia's mother was initially loving but then grew cold and distant, not to mention an alcoholic. The only reason Thalia didn't run away sooner was because of [[spoiler: her younger brother Jason.]]
* ActionGirl: Like most female demigods.
* AcrophobicBird: Kind of sucks that the daughter of lightning and the sky (which gives her wind and electricity powers) is scared of heights.
* ApocalypseMaiden: [[spoiler:Defied. Because she has the FatalFlaw of being weak when offered power, like her father, she avoids being the demigod in the prophecy to make a choice that will save or destroy Olympus upon turning sixteen by becoming a Hunter and staying fifteen]].
* ArcherArchetype: [[spoiler:After she joins the Hunters of Artemis in book three]], she grows into this while wielding a bow with arrows as her weapon, becoming calm, calculating, and a little distant.
* AloofDarkHairedGirl: In contrast to blonde heroine Annabeth and FieryRedhead Rachel, Thalia is sarcastic, slightly petty, and cold. She grows into this trope more when she [[spoiler:becomes a Hunter]], becoming much more mature and aloof.
* BackFromTheDead: More like back from being turned into a pine tree.
* BrokenBird: She seems to be getting better.
* CoolCrown: Wears a silver circlet [[spoiler:after becoming Artemis's lieutenant]].
* CelibateHeroine: [[spoiler:After she joins the Hunters, as they swear off men.]]
* DangerousSixteenthBirthday: [[spoiler: It never happens, leaving Percy and Nico as the only candidates for the Great Prophecy's "hero."]]
* DefrostingIceQueen: Starts out as cold and arrogant, but mellows down eventually.
* DontYouDarePityMe: At first.
* {{Fangirl}}: Of punk rock and roll.
* FatalFlaw: She's said to be weak when offered power, like her father.
* HumanMomNonhumanDad: Her dad's Zeus and her mom is a WhiteDwarfStarlet.
* ImmortalityBeginsAtTwenty: [[spoiler: A day short of sixteen, rather.]]
* TheLancer: To Percy. Also somewhat literal, considering her weapon of choice, aside from her standard bow and arrow, is a spear. That grows out from a can of Mace. She also serves this role to Zoe during ''The Titan's Curse'', where Zoe is TheLeader of the quest to rescue Artemis and Thalia is the one who clashes with Zoe the most.
* OlderThanTheyLook: [[spoiler:She's twenty-one, but being a pine tree stunted her aging so she appears fifteen.]]
* PerkyGoth: More of a goth-punk mix. She wears her hair short and choppy, dresses in dark colors, and likes Music/GreenDay a lot, but she's a really nice kid once she defrosts.
* PluckyGirl: Despite her cold personality and everything she's been through., she's pretty eager to fight and is always brave.
* PosthumousCharacter: In the first two books she's remembered through other characters' recollections, but she's brought back to life at the end of the second book.
* PromotedToParent: For Annabeth.
* PutOnABus: [[spoiler: After she joins the Hunters, she becomes a vaguely mentioned character. However, the bus comes back in the fifth book.]]
* RefusalOfTheCall: [[spoiler:Opts to stay a day short of sixteen forever instead.]]
* ShipTease: With Luke in ''The Titan's Curse'' and ''The Diary of Luke Castellan.''
* ShockAndAwe: Part of her dad's domain.
* TheSnarkKnight: She's rather sarcastic, emphasizing her somewhat distant personality.
* {{Transflormation}}: Spent some time as a pine tree for health reasons.
* WeUsedToBeFriends: With Luke.
* WhyDidItHaveToBeSnakes: Her acrophobia is said to be ironic, considering she's a daughter of the Lord of the Sky.

!!Bianca di Angelo
Daughter of Hades and Maria di Angelo, Bianca and her brother were born in the 1930s.

* ActionGirl: As a Hunter, she's pretty skilled with a bow.
* BigSisterInstinct: Towards Nico. She practically raised him up until they got to Camp Half-Blood.
* BraidsOfAction: After becoming [[spoiler:a Hunter]], she wears her hair in a braid.
* TheChick: Serves this role in ''The Titan's Curse'', as the youngest [[spoiler: (physically)]] and least experienced member of the team that goes to rescue Artemis.
* CynicismCatalyst: [[spoiler:For Nico. Her death left him shell-shocked and bitter. When we meet him next, he's nothing like the CheerfulChild he was while she was alive]].
* DeadPersonConversation: [[spoiler: Nico has a couple with her after her death.]]
* DroppedABridgeOnHer: [[spoiler:Her death]].
* FatalFlaw: Holding grudges. [[spoiler:Very subtly illustrated in her attitude towards her brother, Nico: she loves him dearly, because she's all he has in the world, but she also resents him because being all he has means she can't do anything for herself.]] And for bonus points, [[spoiler:it's indirectly fatal. When she chose to join the Hunters and leave Nico at Camp Half-Blood, Zoe got the idea that she would be a good choice to groom as the next leader of the Hunters, and drags her along on the quest where she dies. What ends up killing her is guilt: she feels bad for resenting Nico, so she steals a souvenir for him from Hephaestus' junkyard, which activates the automaton defending it. She sacrifices herself to shut it off]].
* FishOutOfTemporalWater: Born in the 1930s, but she doesn't seem to be having too much difficulty adjusting.
* HeroicSacrifice: In order to save the rest of the party.
* HumanMomNonhumanDad: Maria di Angelo and Hades.
* KnifeNut: When low on arrows, she takes to using a dagger against the undead soldiers and manages to take out one.
* NeverFoundTheBody: [[spoiler: Her body is not recovered from the wreck of Talos. Since he got electrocuted, it [[BodyHorror probably wasn't in good shape]].]]
* NiceGirl: Sweet-tempered and patient, especially when dealing with her younger brother. See, however, FatalFlaw above.
* NiceHat: Wears a green hat at the beginning of ''The Titan's Curse'', which is noticeable enough that Percy's narration often calls her the girl in the hat before he gets her name.
* PromotionToParent: With their parents unknown and no relatives to speak of, Bianca had to be the parent to her two-years-younger brother. It's part of why [[spoiler: she joined the Hunters because she wanted to do something for herself for a change.]]
* TheQuietOne: Initially, she's depicted as keeping to herself and not drawing attention.
* {{Reincarnation}}: [[spoiler:The sequel series reveals that she chose to be reincarnated after her death.]]
* ShrinkingViolet: Before [[spoiler:becoming a Hunter]]. Afterwards Percy notes she looks more confident.
* SpiritAdvisor: [[spoiler: Becomes one of sorts after her death, warning Nico not to summon their mother's spirit.]]
* StrongFamilyResemblance: Looks a lot like her mother. It's implied this is the reason for Hades favoring her over Nico.
* WeHardlyKnewYe: [[spoiler:Killed off in her debut book]].

!!Nico di Angelo

Younger brother to Bianca and son of Hades and Maria di Angelo. After Bianca's death], Nico runs away and teaches himself to use his unique powers.

* AnnoyingYoungerSibling: Until he gets over [[spoiler: Bianca's death]].
* ApocalypseMaiden: Like Percy and Thalia, the idea that he could be the demigod of the Great Prophecy is considered, and [[spoiler:Hades goes so far as to trick Nico into imprisoning Percy to ensure that Nico is the one]].
* AwesomeMomentOfCrowning: When he declares himself [[spoiler:the king of ghosts]].
* BadassAdorable: Is one of the youngest and smallest characters in the series, but also one of the most badass.
* BewareTheNiceOnes: Adorably perky and annoying in ''The Titan's Curse'', out for blood in ''The Battle of the Labyrinth''.
* BigDamnHeroes: Nico loves this ''so hard.''
* BigSisterWorship: Absolutely loved his sister Bianca, [[spoiler: and her death left him with scars he still hasn't gotten over]].
* BlackSwordsAreBetter: Nico's shadow-black stygian iron sword just happens to absorb a monster's essence when they're killed by it. Neat.
* BreakTheCutie: When he learns about Bianca's death.
* CallingTheOldManOut: Thankfully, [[spoiler:his father is possibly the only Olympian god that could be pestered that far without smiting his child for impudence]].
* CoolSword: All the other demigods have to use plain old celestial bronze. Nico gets black Stygian iron because he's just ''that'' special.
* CheerfulChild: Before [[spoiler:Bianca's death]].
* DarkIsNotEvil: He's frequently described as creepy by someone who is four years older than him. Even Nico himself knows his personality, or just being the [[spoiler:son of Hades]], would make him an outcast. [[spoiler:The fifth book gives him a well-deserved happy ending.]]
* DeadpanSnarker: Has a moment of it in ''The Last Olympian'':
-->'''Percy:''' I think the [[spoiler:river thing]] worked.
-->'''Nico:''' Oh gee, ''you think''?
* DishingOutDirt: Shows some earth-mover abilities, especially at the end of ''Battle of the Labyrinth''.
* DueToTheDead: When [[spoiler:King Minos]] tells him he can just summon the dead by offering them animal blood, Nico insists he will treat them with respect and offers them Happy Meals and Coke.
* EeriePaleSkinnedBrunette: First described as olive-skinned, but he seems to get paler and paler as the series progresses. Possibly a side effect of spending time in the Underworld: in ''Percy Jackson's Greek Gods'', Percy says Hades' complexion got much paler after he became King of the Underworld as well.
* EmoTeen: A preteen version. [[BreakTheCutie It's not that he doesn't have a good reason for angsting]], but it does get kind of ridiculous at times. It doesn't help that he has the ability to communicate with dead people, but the one ghost he ''wants'' to speak to is avoiding him [[spoiler: and is later reincarnated]].
* FishOutOfTemporalWater: Averted. [[spoiler:Even though he was frozen in time, he adapts quite well; I don't think they had trading card games in the 1920's.]]
* FatalFlaw: Holding grudges. He holds Percy responsible for Bianca's death.
* HumanMomNonhumanDad: His father is Hades.
* IneffectualLoner: [[DownplayedTrope Downplayed]], as he could be pretty effectual while working alone as seen in both “The Battle Of The Labyrinth “and “The Last Olympian”.
* MissedTheCall: Percy got it instead of him.
* {{Necromancer}}: Summons [[spoiler:an army of the dead]] in the last book.
* NiceToTheWaiter: Hestia notes that Nico was one of the first demigods to bother talking to her in ages.
* OlderThanTheyLook: Bianca and Nico were born in the 1930's, but he and his sister were put in the Lotus Hotel by their father. This kept them from aging until the Prophecy came up.
* PerkyGoth: Dresses in black and leather, and is the son of Hades. Despite this, he can be a pretty friendly guy.
* PunnyName: Nico di '''Angel'''o.
** You can also say that this is an IronicName
* ShipTease: Played with rather epically. He is depicted as being shy around Annabeth, which [[UnreliableNarrator Percy]] interprets as him having feelings for her. Come ''[[TheHeroesOfOlympus House of Hades]]'', [[spoiler: we learn that he was actually jealous of her, as his true crush was on Percy himself]].
* TellMeAboutMyFather: Nico's quest in ''The Last Olympian'' is to make his past make sense, and the only way he can do that is to convince Hades to tell him about his mom.
* TookALevelInBadass: Yes, the cute, excited little ten year old turns into one of the most badass characters in the series.
* TroubledButCute: At first he's just an annoying cute little bro, then [[spoiler: his sister dies]]. He stays cute.
* TheUnfavourite: Hades makes it blatantly obvious that he likes Bianca more than Nico.
* YouShouldHaveDiedInstead: Hades implies this. He gets better.

!!Ethan Nakamura

Son of Nemesis, the goddess of revenge and balance, Ethan was one of the many residents of Cabin Eleven who went unclaimed or had no cabin of their own because their parents were minor gods. He promised his mother he would make a place on Olympus for the minor gods, and in exchange she took his eye.

* EyepatchOfPower: Wears one to cover his missing eye.
* EyeScream: His mother took his eye part of the promise that he would change Olympus for the better.
* FallenHero: As a former camper.
* HeelFaceRevolvingDoor: Starts out as a hero, then turns to Kronos's side, then [[spoiler:turns back to being a hero again at the last second in ''The Last Olympian'', resulting in his death]].
* HoistByHisOwnPetard: [[spoiler: When he tries to kill Kronos, Ethan's blade shatters and one of the pieces spears him.]]
* MookLieutenant: Kronos/[[spoiler:Luke's]] main demigod subordinate during ''The Last Olympian.''
* PrideBeforeAFall: His mother is the goddess that causes the "fall" part of this trope. Ethan himself follows in her footsteps.
* RedemptionEqualsDeath: [[spoiler: In ''The Last Olympian'', he changes sides at the last second when he realizes that Kronos doesn't build, only destroys, and tries to kill Kronos. Kronos, in turn, kills him for turning against him]].
* StealthPun: He is blind in one eye. His goal is to bring justice for the minor gods. You could say...justice is blind. (Or, in this case, half blind.)
* TarotMotifs: 8th, Justice.
* UngratefulBastard: [[spoiler: Despite Percy saving his life, Ethan pledges his loyalty to Kronos. This is the last demigod needed to resurrect Kronos.]]


[[folder:Other Camp Residents]]

Introduced as Mr. Brunner, Percy's Latin teacher, Chiron is actually an immortal centaur keeping an eye on Percy. He serves as activities director of Camp Half-Blood and the VoiceOfReason.

Played by Creator/PierceBrosnan in the film adaptation of ''The Lightning Thief'' [[TheOtherDarrin and]] Anthony Head in ''The Sea of Monsters''.

* TheArcher: Archery is his main form of fighting.
* AntagonisticOffspring: To Kronos, as are all the Olympians.
* CoolTeacher: Head of Camp Half-Blood.
* {{Herald}}: Explains the magical world to Percy.
* MrExposition: See {{Herald}}.
* ObfuscatingDisability: We first see him as Mr. Brunner, Percy's wheelchair-bound Latin teacher. Turns out his wheelchair is merely a HammerspaceHideaway for his horse legs.
* OurCentaursAreDifferent: They can masquerade as normal humans!
* ReallySevenHundredYearsOld: The immortal trainer of heroes and all that. At least until it is deemed that his services are no longer needed.
* ReasonableAuthorityFigure: To the rest of the camp.
* SuperWheelchair: It's a HammerspaceHideaway for his horse legs.
* TeamDad: As camp director, this is pretty much his job.
* VoiceOfReason: To the rest of the camp.

Tyson is first introduced as a school friend of Percy's, but he is later revealed to be a Cyclops - one-eyed children of Poseidon, therefore making him Percy's half-brother.

Played by Douglas Smith in the film series.

* TheAce: He ''sounds'' dumb sometimes, and he can be a bit of a crybaby, but he can do ''anything.''
* AdaptationalAttractiveness: In the movie.
* TheBigGuy: Already the largest of Percy's main team, as a cyclops he has superhuman strength. Tyson's strength is considered extreme even for a cyclops though--he was able to defeat a fellow cyclops named Ma Gasket with two punches, and Ma Gasket was considered powerful for a cyclops herself. He was also able to bring down a Colchis bull with his bare hands and survive Kampe's poison. Being immune to both fire and water is just icing on the cake.
* {{Cloudcuckoolander}}: He seems he's got a few screws loose, but actually has mad engineering skills.
* {{Cyclops}}: Is one.
* TheEngineer: Becomes one after working in the Cyclops's forge.
* GentleGiant: Over six foot tall, but really childish and willing to get along.
* GeniusDitz: He is apparently really good at Monopoly.
* NiceGuy: See GentleGiant.
* TrademarkFavoriteFood: Peanut butter.
* VoiceChangeling: Apparently all cyclops have this power, it is considered creepy so he doesn't use it much.

!!Mrs. O'Leary
Quintus's dog. Later becomes Percy's after Quintus/Daedalus dies.

* BigFriendlyDog: Emphasis on ''big.''
* DarkIsNotEvil: She's a hellhound and also a BigFriendlyDog.
* FluffyTheTerrible: A hellhound named "Mrs. O-Leary."
* {{Hellhound}}: Is one.
* JustWhistle: In the fourth book.
* PetMonstrosity: To Quintus.


Percy's trusty horse, who he rescued from slavery in Luke's ship. Percy can talk with him because he's a son of Poseidon, who made horses.

* CoolHorse: He's Percy's trusty steed, ''and'' he's cool.
* DontCallMeSir: Most subjects of Poseidon insist on calling Percy "lord," but he insists they use his name. Blackjack compromises by calling him "boss."
* JustWhistle: This is how Percy can summon him, as well as additional pegasi (Guido and Porkpie say hi) if needed.
* HorsebackHeroism: Much of the [[FinalBattle Final Battle]] is done with Percy riding him.
* {{Pegasus}}: [[ExactlyWhatItSaysOnTheTin That's what he is.]]
* {{Retcon}}: He was referred to by Percy as female in ''The Sea of Monsters,'' but in all books after that he's male.
* SapientSteed: He is, technically, a person, but he doesn't seem to mind serving as a mount.

Grover's dryad girlfriend, who is first introduced in the third book.

* BetaCouple: With Grover, with whom she gets with far quicker than Percy and Annabeth do.
* ClingyJealousGirl: Implied to be this in ''The Demigod Files'', where Grover comments on the beauty of the tree nymphs up in Lake Placid, but then asks the interview to edit that part out so that Juniper won't kill him.
* ExactlyWhatItSaysOnTheTin: Her tree is a juniper tree, hence her name.
* GenkiGirl: Very cheerful.
* {{Glomp}}: Does this to Grover when he comes back to camp in the final book.
* GracefulLadiesLikePurple: Wears a purple gossamer dress in ''The Last Olympian''.
* GreenEyes: She has green eyes as an indication of her status as a wood nymph.
* InterspeciesRomance: She's a dryad, while Grover is a satyr.
* OnlyOneName: "Juniper."
* SatelliteLoveInterest: She's really only significant because of her relationship with Grover.
* WeaksauceWeakness: As with all dryads, she is basically the spirit of a tree. Kill the tree, Juniper dies.



!!Sally Jackson
Percy's mother, who can see through the Mist. [[MommasBoy A staple in his life,]] she's selfless, funny, and hardworking, and Percy's first and best mentor.

Played by Catherine Keener in the film series.

* ActionMom: As of book five when something happens and she unloads on a monster with a shotgun (In Chapter 18, which is aptly named [[InWhichATropeIsDescribed "My Parents Go Commando"]]))
--> '''Percy:''' Mom! When did you learn to fire a shotgun?
--> '''Sally:''' About two seconds ago,
* AmazinglyEmbarrassingParents: Only in the beginning of the third book, and lovingly so. [[SugarWiki/FunnyMoments She tells stories about how cute Percy was as a baby, especially naked in the bathtub, in front of his crush]].
* BadassNormal: Though she lacks divine origins, she's a MamaBear par excellence who will attack anyone who tries to hurt her son.
* BewareTheNiceOnes: A trait she shares with her son. Uses a ''shotgun'' to fend off a monster in ''The Last Olympian''. [[spoiler:This stretches back as far as ''The Lightning Thief'', where it's heavily implied that she used Medusa's head to turn Gabe to stone once his unwitting protection for Percy was no longer applicable.]].
* GoodParents: Genuinely cares about her son's well-being, and shows it a lot.
* ISeeThemToo: Can see through the Mist.
* KaleidoscopeEyes: Described as being blue, but they change color in the light.
* TheMaidenNameDebate: She kept her name when she married Gabe Ugliano. Can you blame her? It's not specifically brought up with her second husband.
* MamaBear: She might be just a mortal woman, but she never lets this get in the way of her and Percy. She married Gabe Ugliano specifically because he smelled so strongly that it camouflaged Percy from monsters who would have otherwise smelled ''him''.
* HappilyMarried: To Paul, after [[spoiler:getting rid of Gabe.]]
* NotSoDifferent: Percy notes near the end of the first book that she has a rebellious streak in her too, mellowed by years and circumstance.
* ParentsAsPeople: Her marriage problems are given extensive focus.
* ParentalAbandonment: Her parents died in a plane crash when she was young.
* ShotgunsAreJustBetter: Uses a shotgun to send a monster flying in the fifth book.

!!Paul Blofis
Sally's boyfriend and eventually second husband, Paul is Percy's English teacher. He finds this arrangement slightly awkward.

* ActionDad: In the fifth book, where he picks up a sword and promptly [[BadassNormal kills a dracaena with it]]. After which he says a memorable quote:
-->"I hope that was a monster I just killed. I was a Shakespearian actor in college! Picked up a little swordplay!"
* BadassNormal: Is a normal human, with no powers, who can't see the monsters attacking his stepson. This does not stop him picking up a sword and killing them anyway.
* HappilyMarried: Marries Sally in ''Battle of the Labyrinth''.
* PunnyName: Percy initially calls him Paul Blowfish behind his back, but stops doing it after he gets to know him better.
* SecondLove: To Sally, after Poseidon.

!!Frederick Chase
Annabeth's estranged father, who is fascinated by historical warfare.

* AbsentMindedProfessor: He tends to lose his train of thought.
* ActionDad: In ''The Titan's Curse'' when Percy and friends are fleeing Mount Othrys, Frederick Chase flies by in a [[BreakOutTheMuseumPiece Sopwith Camel]] and [[BadassNormal strafes a line of monsters with bullet casings made of celestial bronze.]]
* BadassNormal: In ''The Titan's Curse'', he pulled a BigDamnHeroes moment when he flies a Sopwith Camel into battle, shooting monsters with celestial bronze bullets.
* PapaWolf: Turns out to be like this even after all the crap he put his daughter through. During his BigDamnHeroes moment:
-->"Get away from my daughter!"
* ParentsAsPeople: He cares a lot for his children, but he can be absent-minded at times.

!!Rachel Elizabeth Dare
A mortal girl Percy befriends, who is later revealed to be able to see through the Mist. In ''The Last Olympian'', she becomes the host for the Oracle of Delphi.

* ActionSurvivor: She isn't a fighter, but is pretty adept at surviving dangerous situations with monsters regardless.
* BadassNormal: She hit the BigBad in the eye with a hairbrush.
* BettyAndVeronica: The Veronica to Annabeth's Betty.
* {{Bookworm}}: Mentioned in ''Battle of the Labyrinth''.
* ChekhovsGunman: Makes her debut as a random bystander who saves Percy's bacon at Hoover Dam in ''The Titan's Curse'', and becomes a key character in the next two books.
* {{Cloudcuckoolander}}: Treated this way by normal mortals, as she can see through the Mist. Ironically, this makes her the OnlySaneMan, seeing real reality.
* DidYouJustFlipOffCthulhu: Famous for hitting [[BigBad Kronos]] in the eye with a blue plastic hairbrush.
* FaintingSeer: As of becoming [[spoiler:the mortal host for the Oracle of Delphi]] in ''The Last Olympian''. She zones out and [[spoiler:the spirit of the Oracle]] takes over her body, using it to [[spoiler:recite prophecies]]. Lampshaded when Rachel worries about this happening in the middle of class.
* FieryRedhead: Spirited and passionate, with curly red hair.
* GenreSavvy: More aware of the Greek world than most demigods, due to her mist-seeing abilities.
* GenkiGirl: A mild form, but she talks a lot and is very enthusiastic.
* HeroesWantRedheads: Played with. She likes Percy, but so does Annabeth, making a LoveTriangle. Ultimately, [[spoiler:it's subverted, since Percy ends up with the blonde Annabeth instead of redhead Rachel]].
* ImprobableWeaponUser: Uses, of all things, a ''blue plastic hairbrush'' to smack [[BigBad Kronos]] in the eye with.
* ISeeThemToo: Can see through the Mist.
* IWantMyBelovedToBeHappy: See the below trope for elaboration.
* LovingAShadow: [[spoiler:More or less, Rachel's attraction to Percy rooted from her inevitable destiny to become the next Oracle.]]
* PluckyGirl: Roadtrip to almost-certain-death? Why not?
* RebelliousPrincess[=/=]TomboyPrincess: Modern version, as a business heiress. Prefers hanging in jeans with demigods, than attending the fancy academy her father has planned for her.
* RomanticFalseLead: To the Percy/Annabeth pairing.
* RomanticRunnerUp: [[spoiler:In the end, Percy gets together with Annabeth instead of her. She doesn't mind, though, becoming the host for the Oracle and all]].
* SecretlyWealthy: The Dares are loaded.
* ShipTease: With Percy.
* SignificantGreenEyedRedhead: As an AscendedExtra who eventually [[spoiler:becomes the next Oracle]].
* SpiritedYoungLady: Look above.
* SpoiledSweet: Her father gives her anything she'll ask for, but she doesn't let it get to her head.
* UnfazedEveryman: [[spoiler:Until the ''The Last Olympian''.]]

!!May Castellan
Luke's mother, who is described as kind-hearted and multitalented. Until she tried to become the Oracle of Delphi despite Hades's curse, and paid the price for it.

* FaintingSeer: Became one.
* GoMadFromTheRevelation: She went nuts after [[spoiler: trying to take in the Oracle's spirit and seeing what would happen to her son.]]
* ISeeThemToo: Born with the Sight. [[spoiler: It ends badly when she tries to become the Oracle.]]
* MadOracle: [[spoiler: Became one.]]
* MindRape: [[spoiler: Taking in the Oracle's spirit drove her mad.]]
* MyBelovedSmother: At her best. No wonder Luke ran away.
* TheOphelia: She's beautiful, but extremely unstable.
* ParentalAbandonment: Somewhere in the middle. She's ''there'', but she's ''not'', you know?
* WalkingSpoiler: Almost everything about her in ''The Last Olympian'' is a spoiler.

!!Gabe Ugliano
Percy's abusive stepfather at the beginning of the series. He isn't the nicest of guys. [[spoiler:By the end of ''The Lightning Thief'', he's turned into a stone statue by Medusa's head. It's heavily implied that Sally used this on him]].

* AbusiveParents: He's a downright crappy stepfather to Percy.
* AssholeVictim: [[spoiler:Turning someone into stone from cold blood would have ordinary been a rather morally ambiguous act, but by the point it happens, he has proven himself such an asshole that you will at worst not care, at best cheer]].
* DomesticAbuser: Implied to be one towards Sally.
* EvilSmellsBad: Percy describes him as such.
* FatBastard: Very fat, and very mean.
* {{Jerkass}}: Especially to Percy.
* MeaningfulName: His last name should have plenty of hints as to his personality.
* TakenForGranite: [[spoiler:Gets turned to stone by Medusa's head. Sally later sells this statue for quite a lot of money.]]


Tropes that apply to many of the gods:

* AFormYouAreComfortableWith: Justified, as anyone seeing them in their true forms would probably be crispy-fried in an instant.
* AntagonisticOffspring: To Kronos.
* BerserkButton: ''Don't'' sit in their chair. Granted, said chairs are 10-foot-tall thrones on the summit of Mount Olympus (now located several miles above the top floor of the Empire State Building), so it's not like a mortal can ''accidentally'' sit in their chairs.
* BunnyEarsLawyer: Many of the gods: Poseidon is one of the three most powerful gods in existence, and he walks around in a Hawaiian shirt and shorts; Dionysus likes playing Pac-Man and whines about being forbidden to drink wine and can only drink pop; and Apollo is the god of medicine, drives the sun chariot as a Maserati Spyder, and lets fifteen-year-old girls take it for a spin.
* GodsNeedPrayerBadly: Subverted, as their strength comes not from prayer, per se, but the Western Civilization. The gods can still lose strength if their discipline is not respected (like Pan does as the wild is increasingly damaged), and it's implied that the destruction of Olympus would plunge the western world into chaos.
* HonestCorporateExecutive: Or CorruptCorporateExecutive in some cases. A lot of the gods run their disciplines like modern day businesses- Hermes has a postal service, Hephaestus has a TV station, and Iris lets demigods send emails through rainbows.
* JerkassGods: Most of the gods at one point or another, but especially Zeus and Ares. Even the most sympathetically portrayed have their moments.
* MayflyDecemberRomance: With any demigod's mortal parent. The only major Olympians who do not have children are Hera, Hestia, and Artemis.
* ParentalAbandonment: They're both victims of this and guilty of it.
* ReallySevenHundredYearsOld: Bordering on TimeAbyss.
* VoluntaryShapeshifting: All of them can change their appearance at will, and hence have "preferred" forms.
* YouCannotGraspTheTrueForm: Gods take different shapes due to the fact that their true forms will incinerate anyone who sees them as such.

The goddess of love and beauty. As one might expect, her role in an adventure story is pretty minimal.

Played by Serinda Swan in the film series.

* AllGirlsWantBadBoys: Her relationship with Ares.
* EmpathicShapeshifter: When one encounters her, she will constantly alter her appearance to better fit the viewer's personal ideal of beauty.
* EternalLove: Even if the rest of Olympus were to crumble into dust, Aphrodite would live on, since she represents love and emotional attachment.
* HelloNurse: As the goddess of love and beauty, she appears as everybody's personal standard of gorgeousness, invoking this.
* LoveFreak: She's very passionate about her domain.
* ObfuscatingStupidity: It's hinted she's a lot smarter than she lets on.
* ProudBeauty: She's very proud of her status as the goddess of beauty.
* ShipperOnDeck: She even tells Percy that she'll screw with his relationship with Annabeth just [[ItAmusedMe for the hell of it]].
%%* TricksterMentor
* WorldsMostBeautifulWoman: [[JustifiedTrope Justified]] and/or [[InvokedTrope Invoked.]] Percy describes Aphrodite's face as constantly shifting slightly to better become his personal ideal beauty.
* YourCheatingHeart: Gleefully cheats on Hephaestus with Ares.

The god of war. As one might expect, he's petty and not that bright.

* AbusiveParents: It's implied that he was this to Clarisse.
* AgonyOfTheFeet: Percy beats him in combat by stabbing him in the foot.
* BadassBiker: His preferred form is one of these, riding a black Harley-Davidson.
* BattleAura: Emanates an aura that makes people violently angry.
* BloodKnight: Loves combat quite a lot, as the god of war.
* BootsOfToughness: Part of his biker guise.
* CoolShades: Wears them as part of his BadassBiker persona.
* DumbMuscle: Sort of. While quite a competent tactician, Ares's pettiness and temper causes him to forgo strategy and use brute force in battle. His arrogance also causes him to underestimate his opponents. This is in contrast to [[TheStrategist Athena]], goddess of ''tactical'' warfare.
* EverybodyHatesAres: He is depicted as an unlikable, petty jerkass who bullies his children. He's only considered a "good guy" because he's a god and not a Titan, and even his family doesn't know why they put up with him sometimes. That said, he has done some things that contributed to Titan advances.
* TheFriendNobodyLikes: Even his own family doesn't know why they put up with him, and he verges NominalHero status by being a god and not a Titan. The exception to this is his lover Aphrodite.
* HumanResources: The saddle of his bike is implied to have been made from human skin.
* {{Jerkass}}: Ares is not that nice. He bullies his demigod children and picks fights with Percy every chance he gets.
* KarmaHoudini: Other than losing a fight against Percy, he was never punished for his actions in ''The Lightning Thief''.
* MyHorseIsAMotorbike: The bike is actually his chariot in modern form.
* OneManArmy: Can bless demigods and possibly mortals, temporarily turning them into one of these.
* ShotgunsAreJustBetter: The Mist surrounding his duel with Percy in ''The Lightning Thief'' has Ares using a shotgun.
* SoProudOfYou: [[spoiler:To Clarisse, after she single-handedly kills the drakon.]]
* SoreLoser: After losing to Percy in a duel, he curses Percy so that he needs his sword skills the most, his strength would fail him. It comes back to bite Percy in ''The Titan's Curse'' when he goes up against Atlas and the curse kicks in when Percy tries to chop Atlas' spear.
* UnwittingPawn: [[spoiler:Of Kronos and Luke in ''The Lightning Thief''.]]

The goddess of the moon, the hunt, and maidens. She is sworn as a perpetual maiden, and thus has no true children, but she does "adopt" maidens who foreswear men forever. Her main weapon in combat is a bow and quiver of arrows to use with it.

Played by Ona Grauer in the film series.

* ActionGirl: Very good in combat, as expected of the goddess of the hunt.
* AdaptationDyeJob: It's stated she has auburn hair in the books, but is a brunette in the graphic novel.
* AFormYouAreComfortableWith: Typically appears as a twelve-year-old girl, since most of the Hunters are around that age.
* AgeLift: In the movie, she appears as a full-grown woman instead of the young-girl form she assumes in the book.
* {{Animorphism}}: Possibly. When Artemis is fighting against Atlas she is seen taking different animal forms at great speed by Percy. He then admits that another possibility could be that [[spoiler:the pain of holding the sky]] is making him hallucinate and “see things.”
* BadassInDistress: During ''The Titan's Curse.'' Once she's freed, she gets to battle Atlas.
* BerserkButton: Do ''not'' harm a maiden in front of her. To a [[PlayedForLaughs lesser degree]], Apollo flirting with her Hunters.
* CuteBruiser: At least in her preferred form.
* DoesNotLikeMen: But doesn't exactly ''dislike'' them either, as shown when she [[spoiler: praises Percy and supports keeping him alive.]] Her sphere just includes the protection of women and children; therefore, until a man proves himself, he's beneath her notice.
* DualWielding: Wields two knives during her fight with Atlas.
%%* LadyOfWar
* MamaBear: To her Hunters and maidens in general. Harm towards them isn't allowed when she's around.
* NotBad: At the end of the ''The Titan's Curse'' she tells Percy that he didn't do bad, for a man. At first Percy [[ComplimentBackfire thought it was an insult]] but then he realized that it was the first time she actually called him a man instead of a boy.
* ParentalSubstitute: To her Hunters.
* PintsizedPowerhouse: She has the size and appearance of a twelve-year-old, but it doesn't stop her from kicking ass.
* PolarOppositeTwins: Her and Apollo are extremely different in appearance and temperament.
* SiblingSenioritySquabble: With Apollo. She's older. According to mythology, she helped ''deliver him as a baby''. He cheerfully ignores this fact in favor of calling her "little sis" at every opportunity.
* StrawFeminist: Subverted; Percy does note how ridiculously radical she and her hunters are, but Artemis is also a goddess and hero who can be profoundly wise and kind, and is not nearly as misandrist as Percy makes out at first. And, given the sheer number of times Artemis or her followers are outright assaulted in the myths by gods and nature spirits who view their unavailability as a challenge (even her own father Zeus raped her nymphs), she's kind of entitled to a bit of wariness.
* TeamMom: To the Hunters; shares the role with Zoe, though she's more at ease and welcoming than her lieutenant.
* TokenMiniMoe: Her preferred form, as it's the same age as many of her Hunters.

The god of the sun, poetry, prophecy, and medicine, and Artemis's older twin brother (but don't bring that up). He speaks through the Oracle of Delphi.

Played by Dimitri Lekkos in the film series.

* BigBrotherInstinct: He has a bit of this for Artemis, considering how he defied Zeus's orders to give advice to Percy and his friends on how to save her.
* CombatMedic: Healing is part of his domain, but he's also a competent fighter.
* CoolCar: He likes the sun chariot in the form of a sports car. And he lets fifteen-year-old girls take it for a spin.
* HotGod: This applies to most of the gods, but special emphasis is given to Apollo (and Aphrodite, but that's a given).
-->'''Thalia''': Wow. Apollo is hot.\\
'''Percy''': He's the sun god.\\
'''Thalia''': That's not what I meant.
* PolarOppositeTwins: He and Artemis are extremely different in appearance and temperament.
* RealMenWearPink: Parodied. His being the god of poetry is PlayedForLaughs, with him spouting haikus at the best of times.
-->'''Apollo''': Green grass breaks through snow,
-->Artemis pleads for my help,
-->I am so cool.
** When Artemis points out that the last line is only four syllables, he changes it to: "I am so awesome."
* ThePowerOfTheSun: God of the sun, natch.
* SiblingSenioritySquabble: With Artemis.

The goddess of wisdom. A perpetual maiden, her "children" are born from a quite literal meeting of minds between herself and a mortal.

Played by Melina Kankaredes in the film.

* ActionMom: For Annabeth.
* {{Foil}}: To Ares. They're both war gods, but Athena prefers tactics and strategy while Ares prefers brute force.
* GrayEyes: Quite famously.
* GeniusBruiser: She is the goddess of both wisdom and battle strategy, and in classical mythology is one of more powerful gods, next to Zeus and Poseidon. Percy himself [[LampshadeHanging points out]] that Athena would be a worse enemy to have than even Dionysus or Ares, because if she planned to have you killed, then you ''would'' die. No matter what.
* IfYouEverDoAnythingToHurtHer: Invoked by Athena towards Percy in regards to his friendship with Annabeth. As stated above, Athena would be the worst enemy to have amongst the gods. If she wanted you dead, then you would be ''dead'', no matter how hard you would try to evade her.
* LadyOfWar: One of the oldest ones in the book, she's calm and solemn but also ''very'' capable of kicking your ass.
* [[OverprotectiveDad Overprotective Mom]]: Well, as "overprotective" as any of the absentee parent gods can get, anyway, but she's shown not to particularly like the idea of Percy being with her daughter.
* TheSmartGuy: Among the Olympians.
* TheStrategist: Tactical warfare is part of her domain, so she fulfills this role among the Olympians.

Goddess of the harvest and Persephone's mother.

* DemotedToExtra: From the original mythology, at least; she only gets an appearance in the winter solstice in the first book, a scene with her daughter and Hades in ''The Last Olympian'', and a few appearances in battle.
* GreenThumb: Plants are part of her domain. In the last book she turns an entire army into a wheat field.
* MyBelovedSmother: To Persephone.
* ObnoxiousInLaws: Manages to be this to her ''[[BigScrewedUpFamily brother]]'' Hades regarding him and Persephone, criticizing Hades' work and wishing Persephone could have married someone with a more respectable domain.
** JewishMother: Though obviously not literally, the [[JewsLoveToArgue sheer speed]] in which she cranks out complaints about her daughter and brother-in-law's lives has shades of this.

The god of wine, parties, and insanity. He's being "[[CoolAndUnusualPunishment punished]]" by being assigned as the head of Camp Half-Blood for 100 years after chasing after an off-limits nymph, and is grouchy due to being put off the bottle and thus can't drink until his punishment is over. Has an extremely strong dislike of heroes. Known as "Mr. D" to the campers.

Played by Luke Camilleri in the film adaptation of ''The Lightning Thief'', [[TheOtherDarrin and]] StanleyTucci in ''The Sea of Monsters''.

* AccidentalMisnaming: Mr. D staunchly refuses to get ''any'' of the campers' names right. Just ask Peter Johnson.
* TheAlcoholic: Although he's forbidden to touch anything wine-related for the next century, much to his annoyance.
* BigDamnHeroes: In ''The Titan's Curse'', saving Percy, Thalia, Zoë, and Grover from Dr. Thorn and his soldiers.
* DemotedToExtra: In the film series, his punishment doesn't seem to be in effect, and as such Chiron seems to be camp director instead of him. He only has a cameo appearance at the Olympian council.
* FreudianExcuse: A non-villainous example. The reason he dislikes demigod heroes is because his wife Ariadne were abandoned by the demigod Theseus. Probably not helped by the fact that he's TheAlcoholic forbidden from touching anything even remotely wine- or alcohol-related, thus going through withdrawal. (For more information on his backstory, be referred to ''Percy Jackson's Greek Gods''.)
* JerkWithAHeartOfGold: Often comes across as mean and uncaring, but he genuinely cares about the protagonists and comes to their aid in one crucial moment.
* MindRape: His signature move, being the god of insanity. [[spoiler:He does say that the insanity he put on Thorn's soldiers was temporary, but it is scary.]]
* NotSoDifferent: He rather explicitly expresses his [[BerserkButton disdain]] of mortal tendencies to speak ill of his fellow gods for their [[JerkassGods behavior]] when mortals [[HumansAreTheRealMonsters have plenty of their own bad apples]].
* PapaWolf: Minor example, but he contacts Percy in a dream to make sure his [[spoiler:one remaining]] son is safe.
* PetTheDog: Restoring Chris Rodriguez' sanity in ''The Battle of the Labyrinth.''
* TheOtherDarrin: Played by Luke Camilleri in the first film and Stanley Tucci in the second. Justified in-universe due to all the gods being able to change their appearance.
* YouAreWhatYouHate: He was himself a demigod hero, since his mother was mortal, despite hating them.

The god of the underworld. Bitter and asocial, but not truly evil.

Played by Steve Coogan in the film series.

* AnimalMotifs: He is described as been similar to a panther: lithe, graceful and dangerous.
* AuthorityEqualsAsskicking: In “The Lighting Thief” upon Percy’s meeting with Hades he states that Hades, above Ares and Dionysus, radiated power and that he had an air of order and lordship. The Asskicking part is seen in his BigDamnHeroes moment in “The Last Olympian”
* BigBad: [[SubvertedTrope Subverted]]; He is set up as this for most of the first book, but it's eventually revealed he actually had nothing to do with the theft of the lightning bolt; In fact, he is hilariously pissed about people believing he would want a new war.
* BigDamnHeroes: The end of ''The Last Olympian''
* CallingTheOldManOut: "And if there's one thing we can agree on, it's that you were a TERRIBLE father."
* TheChainsOfCommanding: The main reason he's annoyed by the fact that people believe he would want to steal Zeus's lightning bolt and start a war with it. The underworld is so big he already has enough trouble running it. Why in the world would he ever want to make his kingdom even bigger?
* CoolHelmet: His personal artifact, similar to Poseidon's trident and Zeus' Lightning. It allows him to become ''obscurity itself''.
* CreepyGood: Scares the hell out of his family, but he's on their side when shit hits the fan.
* DarkIsNotEvil: Though [[EverybodyHatesHades everybody is convinced he is]].
* EeriePaleSkinnedBrunette: Pale and dark-haired, befitting the god of the Underworld.
* EverybodyHatesHades: Even though he didn't do anything to deserve it. Although this gets better in the end.
* GoodIsNotNice: The reason he has such a spotty reputation. He can be very harsh with his children if they disappoint him, and is so proud that he won't help save the world over an old grudge. This is par the course for gods, but he's also very brooding and abrasive.
* HappilyMarried: To Persephone, more or less.
* IGaveMyWord: [[spoiler:The only one of the Big Three to take the vow of no children seriously. Or at least more serious than the other two. Zeus being Zeus will screw [[AnythingThatMoves anything at the drop of a hat]], and Poseidon hinted at having many more children than just Percy (Tyson as a case in point). Hades' last set of children were born in the 1920s and his lover got nuked because of it. He had no children since. A smaller example occurs at the end of ''The Lightning Thief'', when, after Percy gets him his Helm of Invisibility back as he promised he would, he promptly takes Sally back to her home- as Poseidon states, the Lord of the Dead knows how to honour his debts.]]
* NotSoStoic: Around his family.
* OrcusOnHisThrone: How Percy, Annabeth and Grover find him in “The Lighting Thief.”
* PapaWolf: Hades, it seems, is willing to go to much further lengths to protect his children than his brothers, including visiting them in person. Plus, it's stated that [[spoiler:Nico]] lives in the Underworld with him.
* ParentalFavoritism: Hades makes it quite clear that he'd rather have [[spoiler:Bianca]] alive instead of [[spoiler:Nico]], though it's probably because of [[spoiler:Bianca]]'s resemblance to their mother.
* SimpleStaff: Acording to Nico, its his WeaponOfChoice.

The god of fire, blacksmiths, metallurgy, and technology.

Played by Conrad Coates in the film series.

* GadgeteerGenius: Dreams up fantastic bits of tech for the gods. According to Aphrodite, he also uses his skill with technology to keep humiliating her and Ares.
* TheGrotesque: On special occasions he'll spruce himself up, so that he looks merely "normal" ugly.
* TheEngineer: Frequently seen working away at his forge, coming up with new weapons and the like.
* NotGoodWithPeople
-->'''Hephaestus''': People are more difficult to work with than machines. And when you break a person, he can’t be fixed.
-->'''Hephaestus''': Was that sarcasm? Machines don't use sarcasm.
* TheUnfavorite: His mother pitched him off a mountain for being ugly. He's still a wee smidgen bitter.

The goddess of women and marriage. She is quite possibly one of the three gods who have never had a demigod child (the other two being Artemis and Hestia).

Played by Erica Cerra in the film series.

* BitchInSheepsClothing: Acts pleasant, but has a particularly nasty side when she doesn't get her way.
* ClingyJealousGirl: To Zeus.
* DysfunctionalFamily: Tries to hide the fact that she's the matriarch of one, but it doesn't really work.
* KnightTemplar: For the "perfect family" ideal. Unfortunately for the goddess of marriage, she's stuck with an infamously philandering husband.
* ParentalFavoritism: She flung Hephaestus off of Olympus for having the audacity to be born less than beautiful, and makes it painfully obvious that she dislikes those demigods born to already-married gods and goddesses.
* StepfordSmiler: She's pleasant and charming, but this crumbles pretty fast. Although being the matriarch of a BigScrewedUpFamily will do that to you.
* WickedStepmother: Displays this the most out of the Big Three's wives, as she's the goddess of marriage and her husband's demigod children are an attack upon her domain. This is the reason she and Thalia don't get on.
* {{Yandere}}: For Zeus. She particularly dislikes Thalia because she's the result of Zeus's infidelity.

The god of messengers, travelers, and thieves. As such, he's always extremely busy.

Played by Dylan Neal in the film adaptation of ''The Lightning Thief'' [[TheOtherDarrin and]] Creator/NathanFillion in ''The Sea of Monsters''.

* BerserkButton: Never imply that he doesn’t care about his sons.
* ObfuscatingStupidity: He knew all along [[spoiler:what would happen to Luke]].
* TheOtherDarrin: Dylan Neal in the first film, Nathan Fillion in the second. Justified in-universe due to gods being able to change their physical appearance at will.
* StepfordSmiler: His amiable and easy-going nature hides tons of guilt.
* TricksterArchetype: [[UrExample One of the oldest examples]].

The goddess of the hearth. She's often overlooked by the other characters, often quite literally.

* AscendedExtra: Plays a far more important role in ''The Last Olympian'' than she does in the original mythology.
* DemotedToExtra: In the original mythology, and of course as part of her past in the books. She seems to have happily embraced the option.
* ChekhovsGunman: [[spoiler:The little girl tending the hearth as Percy tours the camp for the first time in ''The Lightning Thief'' appears four books later as Hestia, goddess of the hearth and the titular [[TitleDrop last Olympian.]]]]
* TheHeart: Fulfills this role for the Olympians.
* KeepTheHomeFiresBurning: Effectively her purpose in life, as she stands watch over Olympus while the other gods are off fighting. She even says the trope name in a discussion with Percy and Nico.
* NiceGirl: She's probably the kindest and most down-to-earth Olympian.
* [[NonActionGuy Non-Action Girl]]: Because her main role is to KeepTheHomeFiresBurning, she doesn't see much, if any, combat.
* OlderThanTheyLook: Hestia in particular takes this trope out of all the gods, because she takes the form of a seven or eight-year old girl.

The lost god of the wild, believed to have been dead for two thousand years.

* DeathSeeker: [[spoiler:Wanted to fade because of the decline in the wild places of the earth, and let the world believe he was dead so he would fade faster, but [[GodsNeedPrayerBadly since the satyrs believed in him]], he couldn't fade yet.]]
* GreenThumb: Nature is part of his domain.
* HesJustHiding: In-universe, Grover does not believe Pan dead and his main motivation throughout the series is to gain a Seeker's license so he can find Pan.
* MagicMusic: Music played on his reed pipes can make plants grow.

Goddess of springtime, Demeter's daughter, and Queen of the Underworld. Married to Hades.

Played by Creator/RosarioDawson in ''The Lightning Thief''

* ClingyJealousGirl: A milder example than Hera, but she doesn't like it when Maria di Angelo is brought up. [[note]]Actually a carry-over from the original mythology, where she turns Hades's ex-mistress into a [[JustSoStory the first mint plant]][[/note]].
* DishingOutDirt: Splits open the earth in ''The Demigod Files''.
* HappilyMarried: To Hades, more or less. Certainly so by Greek standards.
* LadyMacbeth: Goes behind Hades' back to try and ensure he's just as powerful as Zeus and Poseidon. One of the reasons Nico decides to spend more time in the Underworld is so that he can counteract Persephone's influence.
* NoodleIncident: In ''The Demigod Files'':
-->'''Persephone:''' We just had a little family spat.\\
'''Nico:''' ''Family spat''? You turned me into a dandelion!
* RavenHairIvorySkin: Described as such during her time in the Underworld.
* WickedStepmother: To Nico with whom she has a very strained relationship. She apparently turned him into a dandelion at one point.
* WomanInWhite: While in the Underworld and Hades's queen; she wears a washed-out white dress. When she's out of it, her attire is very colorful.

The god of the oceans, storms, earthquakes and horses. Poseidon is shown to take greater care of his children than other gods and is more mature than his brother Zeus.

Played by Kevin McKidd in the film series.

* DotingParent: As doting as an absentee god parent can be, anyway. But he's especially this for Percy in comparison to some of the other gods, especially Zeus and Hades.
* FatherNeptune: The Greek equivalent of the TropeNamer. Especially apparent while fighting against Oceanus in ''The Last Olympian''.
* ImmortalImmaturity: Averted. In ancient times he was very similar to Zeus in temperament. He would often hold grudges and be highly vindictive when things did not go his way. In the series he comes across as having matured to a degree where he is much more reasonable, at least compare to his brother.
* MakingASplash: God of seas and oceans, natch.
* ProngsOfPoseidon: The TropeNamer.

Lord of Olympus and god of storms, justice, and oaths. The last two being ironic considering his actions throughout the series.

Played by Creator/SeanBean in the film series.

* BadassInANiceSuit: The king of Olympus, fought against the Titans in his youth, and personally lead the Olympians into battle against Typhon, and is shown wearing dark, pinstriped suits.
* BoltOfDivineRetribution: Quite literally. His symbol of power is the "master bolt." The first lightning bolt and most powerful weapon in the series. It winds up being the MacGuffin for ''The Lightning Thief''.
* HeadIntheSandManagement: At first, the refuses to allow discussion on the rising threat of the Titans over the protests of the other gods until Artemis forces him to confront irrefutable evidence. In ''Literature/TheHeroesOfOlympus,'' he does the same with the threat of the rising giants refusing to take action once again over the protests of the other gods.
* {{Hypocrite}}: Zeus tears into Poseidon for breaking his oath and calls Percy's birth a crime. Yet he broke the oath first after being the one to force it on his brothers. No one bothers to mention it since he just got his lighting bolt back.
* ImmortalImmaturity: In ancient times, Zeus and Poseidon had almost interchangeable personalities. By modern day, Poseidon has matured to a degree, so he tends to be more reasonable. Zeus has not and still comes across as a pompous git who thinks he is perfect.
* InferioritySuperiorityComplex: One interpretation of his behavior. He quarrels with Poseidon over who their mother Rhea likes better, is paranoid Poseidon is constantly plotting against him, demands respect when no one respects him, closes off of Olympus due to wounded pride, and tries to blame others for his mistakes. He massive ego and demand people respect and obey him comes across as at least partially trying to cover up his own mistakes and knowledge he is a failure that no one likes.
* IRejectYourReality: Zeus tries to deny the return of the Titans until he is presented with irrefutable evidence but by then it is too late to do anything. He denies the return of the Giants as well and that the Olympians need demigod help to stop them. Hera states in ''Literature/TheHeroesOfOlympus'' that Zeus has a long history of this thanks to his pride.
* {{Jerkass}}: All the gods are this to a degree, but Zeus stands out compared to the others.
* InformedAttribute: Zeus supposedly has a charming, fun side that attracts ladies, a more fatherly side that cares for his children, a better king than he once was, and some sort of wisdom that helps him rule the god. All we seen and truly hear about is an arrogant, short-tempered, judgmental jerk that is willing to send his children and lovers up the creek for his own benefit, a terrible king, and no wisdom at all. In the second book series, things fall apart the moment Hera isn't around to keep the peace.
* KarmaHoudini: Despite breaking a sacred oath and pulling a ton of other crap Zeus is never held accountable for his actions. Instead his children often have to pay for his crimes and mistakes. Being the most powerful god around has its perks.
* KingOfTheGods: TropeCodifier.
* TheOathBreaker: Came up with the idea to have no more demigod children and forced the oath upon his brothers for the sake of Olympus. A few decades later, was the first to break the oath and later forced the consequences upon his child.
* ParentalNeglect: Among his many {{JerkAss}} qualities Zeus neglected to have a proper cabin built for his children which ironically makes him one step more of a neglectful parent than other gods who at least built actual cabins for their kids. Instead of a place where a person can live and sleep, Zeus' cabin is a temple dedicated to him. Children of Zeus have to move eagle statues out of the way to sleep in alcoves with a statue of Zeus staring down at them.
* PetTheDog: About Zeus's only redeeming quality is he occasionally will help his children such as turning Thalia into a pine tree to save her from the wrath of Hades and using it to put a barrier around camp to finally make it safe. Whether this in any way makes up for being a crappy parent or being turned into a pine tree is a "good" thing is debatable.
* {{Pride}}: His defining characteristic and source of many of the problems throughout both series.
* ShockAndAwe: Being god of the sky gives him lightning powers. His WeaponOfChoice is even a BoltOfDivineRetribution.
* UngratefulBastard: At the end of the first book, Zeus can not cough up a thank you to Percy and threatens to kill him if he travels in the sky again. At the end of the first series, he can barely eke out a thank you to Hades and Poseidon, agree to Percy's requests, and fails to fulfill all of them. At the end of the second series, Zeus says he is proud of Jason, yet the moment Jason questions Zeus (when Zeus is wrong) Zeus is one step away from killing his own son.


The King of the Titans and suitably the most powerful. He has domain over time and harvest.

* AbusiveParents: He literally ate his children as soon as they were born because it was foretold that he was destined to be overcome by his own sons.
* AndIMustScream: He literally ''cannot'' die. The first time, he was chopped into bits and pitched into Tartarus. The second time, [[spoiler:his consciousness exploded and was spread so thinly across the world that there's little hope of it reassembling]].
* ArchnemesisDad: To many of the Olympians.
* AsskickingEqualsAuthority: Became King of the Titans through being the most powerful, being the one who killed his father in the original mythology.
* BatmanGambit: Allowing the Fleece to be returned to Camp Half-Blood so [[spoiler:Thalia could be brought back to life, and he could count on her FatalFlaw to sway her to his side]] so he could have a chance to control the Great Prophecy. It fails.
* BigBad: Of the entire series. His goal is to be resurrected, and the demigods and gods have to stop him because it would mean the fall of civilization.
* BigNo: Lets one lose when [[spoiler:he's finally defeated]].
* TheChessmaster: Manipulates people and events to further his goal of reforming and taking over the world.
* EldritchAbomination: Described as such.
* SadisticChoice: In the fifth book, Kronos frequently threatens to kill Percy's friends unless he surrenders to him.
* SealedEvilInACan: Initially, his remains are just in a particularly creepy sarcophagus that gets stronger every time a demigod forsakes the Olympians and joins his side. [[spoiler: Later, Luke graduates to being his SoulJar]].
* SinisterScythe: His WeaponOfChoice.
* TimeMaster: Kronos seems particularly fond of slowing time around his opponents to a near stop.
* WeCanRuleTogether: Offers this a bunch of times. Most of them are insincere.
* YouHaveFailedMe: Kronos decides to let Atlas rot due to his repeated failures.

The Titan of Light.

* TheDragon: Second-in-command to Kronos, is the only one fighting in the Battle of Manhattan with him, and is the second most powerful.
* ElementalPowers: He has [[PlayingWithFire fire]] and [[LightEmUp light]] powers.
* LightIsNotGood: The Titan of Light (and uses light and fire-based powers), but ''very'' evil.
* ThePowerOfTheSun: As the Titan of Light.

The Titan of Strength, nephew of Kronos, and father of the Hesperides and Calypso. For his role in the first Titanomachy, he was charged with holding up the sky.

* AndIMustScream: Has been holding up the sky for a very, ''very'' long time.
* ArchnemesisDad: [[spoiler:To Zoë]].
* BigBad: Of ''The Titan's Curse''.
* BladeOnAStick: Uses a spear during his fight with Percy, Artemis, and Zoe.
* TheBrute: Is the most physically strong of the Titans.
* EvilSoundsDeep: His voice is described as being very, ''very'' deep.
* GeniusBruiser: Despite being the Brute, he also is shown to be quite intelligent and a fairly good manipulator.
* HumansAreTheRealMonsters: The reason he likes to recruit Muggles; he feels like they are easy to corrupt, and as such make for good minions.
* KnightOfCerebus: The fight with him is the first one in the series where [[spoiler:a questmate dies.]]
* LargeAndInCharge: The General of Kronos' troops, and described as incredibly tall and large.
* OffingTheOffspring: [[spoiler:Does this to Zoë]].

The Titan of Stars and Constellations.

* ButtMonkey: He thinks of himself this way
* TheDarkChick: Feels like his abilities are being OvershadowedByAwesome.
* TheResenter: To the other Titans.
* VillainOfAnotherStory: ''The Lost Hero'' reveals he was off defending Mount Othrys [[spoiler: from the Romans]].

Titan of craftiness and forethought. Sided with the Olympians in the first war, but out of a desire for revenge on Zeus and thinking the Olympians cannot win switches sides to the Titans.

* AffablyEvil: If one can call him evil.
* IFightForTheStrongestSide: He's foreseen that the Titan's will win the war and this is why he's on their side.
* IfMyCalculationsAreCorrect: Implied that part of his foreknowledge is his ability to calculate probability to predict the most likely outcome.
* RevengeBeforeReason: One possible interpretation of his defection.
* SatanIsGood: In a sense. He is referred to once as "the good Titan" for the aid he has given to mankind with fire and curiosity in defiance of Zeus.
* TheSmartGuy: Among the Titans who appear, he's the most intelligent and predicts the Olympians' loss this time.

Titan of mortal life, brother of Kronos, and father of Prometheus. He appears only in ''The Demigod Files'' and in ''House of Hades''.

* CurbStompBattle: Iapetus vs. Thalia, Nico, and Percy would have ended up as this if not for his LaserGuidedAmnesia.
* HealingHands: A rare villainous example (at least at first), after his HeelFaceTurn he easily heals Percy's injuries.
* HeelFaceBrainwashing: Goes over to the Olympians' side after getting splashed with memory-wiping water.
* LaserGuidedAmnesia: Percy splashes Lethe river water on him, causing him to forget his identity.

!!Other Titans
There are considerably more Titans than are mentioned in the main series, but a lot of them get expounded upon, by none other than Percy himself, in ''Percy Jackson's Greek Gods''. Since their day was before the rise of the Olympian gods, many of them have since faded into the background, with a few exceptions.

* AttentionDeficitOohShiny: Theia, the Titan of gems and jewels. Percy thinks this is why she married Hyperion
* BeingGoodSucks: In addition to Prometheus up there, special mention goes to Rhea. Percy uses language similar to describing his own mother, in that she had the nicest sweetest personality of out of the Titans, which meant she got the worst luck, such as having Kronos fall for her and having him swallow her children.
* BirdsOfAFeather: Tethys (rivers and streams) who marries Oceanus (the ocean). "Hey you like water? I like water too! We should totally go out!"
* TheCasanova: Helios, apparently. He has a tendency to frequent local watering holes to try and impress women.
* TheDitz: Theia is, not too bright. Which is ironic considering she is the Titan of bright and shiny things.
* FortuneTeller: Percy describes Phoebe rather like one.
* HappilyMarried: Tethys and Oceanus, whom Hera tried to model her own marriage after.
* HotGod: Several of them, but Rhea stands out again.
* PhotographicMemory: Mnemosyne, who remembers ''everything''.
* ThePollyanna: Phoebe. Name means "Bright" which was how she tried to see the world.
* PsychicStatic: Zeus first married Metis, Titan of deep thought... and then swallowed her because he feared their children would overthrow him. Metis eventually dissolved into pure, occasionally annoying thoughts in Zeus' mind.
* [[GodNeedsPrayerBadly Titans Need Prayer Badly]]: It's brought up several times that Helios and Selene, Titans of the Sun and Moon, faded away entirely after the Romans reassigned their domains to Apollo and Artemis.


[[folder:Other Characters]]
!!Zoe Nightshade
A huntress of the goddess Artemis and her former lieutenant. One of Atlas's daughters, who was disowned by her family after helping Hercules steal from their apple tree. She is replaced by Thalia Grace after her death and turned into a constellation called "The Huntress" by Artemis.

* ActionGirl: Artemis's second-in-command, and thus good in battle.
* AloofDarkHairedGirl: Cold and distant to anyone who isn't Artemis or a Hunter.
* AmbiguouslyBrown: Is described as having "olive" or "caramel-colored" skin, black hair, and dark eyes; but her ethnicity isn't elaborated on beyond that. It's been suggested that in the original mythology, the Garden of the Hesperides (and thus Zoe's home) was located in what is now Libya.
* AntagonisticOffspring: [[spoiler:To Atlas]].
* ArcherArchetype: Fits this trope better than Thalia initially, being aloof and somewhat cold, as well as an excellent shot with a bow and arrow.
* TheAtoner: There are hints of this in her desperation to rescue Artemis, even [[spoiler: at the cost of her own life]]. She's seen clearly wanting to go with Artemis on her quest and later utterly frantic when she has a vision of Artemis' kidnapping; some of her determination to rescue her goddess can be interpreted as feeling guilty that she failed to protect her.
* BigSisterMentor: Towards Bianca. It's implied that she wanted to groom Bianca to take up the lieutenant title someday.
* TheComicallySerious: Often put in hilarious situations that highly contrast with her serious persona.
* CoolBigSis: To the Hunters of Artemis. Given how protective she is of them, this likely overlaps with MamaBear tendencies.
* DefrostingIceQueen: A non-romantic version towards Percy and Thalia over the course of ''The Titan's Curse''.
* DiedInYourArmsTonight: To Artemis, who [[spoiler:tried and failed to save her]].
* DoesNotLikeMen: But is perfectly capable of liking and befriending them, once they earn more than the barest token respect.
* [[IHaveNoSon I Have No Daughter]]: Her family pulled this on her [[spoiler:for helping Hercules steal from their apple tree]].
* JerkWithAHeartOfGold: In her debut, she comes off as snobby, aloof, and hostile, particularly to Percy. However, over the quest, she starts showing a more caring side, and becomes more sympathetic once her {{backstory}} is revealed.
* TheLancer: To Artemis.
* TheLeader: Of the group sent to rescue Artemis in ''The Titan's Curse''.
* NoodleIncident: After two-thousand-plus years, she and Artemis have a ''lot'' of them. And [[LikeAnOldMarriedCouple they reminisce at the drop of a hat]].
--> "The last boy to see this camp... when was it, Zoe?"
--> "That boy in Colorado. You turned him into a {{jackalope}}."
--> "Ah, yes. I enjoy making jackalopes."
** Apparently the last time the Hunters were at Camp Half-Blood, it burned down. Zoe blames the half-bloods.
** Apollo's poetry phases have apparently been going on for thousands of years. Poor, poor Zoe.
--> "'Tis not as bad as the time he visited Limerick. If I'd had to hear one more poem that started with 'There once was a goddess from Sparta'..."
* NotSoStoic: Very cold and professional, but it's strongly implied she only acts that way because she's not comfortable around half-bloods; we see signs of Zoe having a very active sense of humor and warmth as she relaxes around the quest group, and it's likely that when she's around just the Hunters, that side of her is much more prominent.
* NumberTwo: For Artemis, as her lieutenant.
* SecretlyDying: [[spoiler:Knew from the start that going on the quest was a death sentence for her, but went anyway out of loyalty to her beloved Artemis. During the climax, she's also suffering from poison from Ladon]].
* StarsAreSouls: [[spoiler:She's turned into a constellation, "The Huntress", after she dies]].
* TheStoic: While it's primarily a facade and Zoe appears to be a genuinely loving person when around people she trusts, this is still definitely a huge part of her personality.
-->'''Percy:''' ...She's kidding, right?
-->'''Artemis:''' Zoe rarely kids about ''anything''.
* StrawFeminist: At first appears to be this, but is justified/deconstructed when Riordan reveals a FreudianExcuse for her hating males, and eventually portrays her beliefs in a less radical and ludicrous style. It's not that she ''hates men'', she just doesn't trust ''heroes'' because too many of them have betrayed her or turned on the Hunters in the past.
** Possibly even [[JustifiedTrope justified]], as it's revealed later in the series that ''heroes share a fatal flaw of being prone to self-centeredness and letting the people who help them fall by the wayside''. She's seen that pattern repeat for thousands of years; no wonder she's a little jaded.
* SugarAndIcePersonality: More ice than sugar, but mostly because we see her from Percy's perspective. With the Hunters, she's like a second mother and is a patient sisterly figure towards Bianca. Her loyalty and devotion to Artemis are unyielding, and she comes to respect Thalia and Percy over the course of their quest.
* UndyingLoyalty: To Artemis, so much that [[spoiler:she went on a quest she knew would kill her just to save her]]. The first words out of her mouth when the Oracle faces her are "What must I do to save my goddess?"
** She's so obviously a moment away from willingly shouldering an eternal burden that would kill any non-immortal who attempted it, solely because [[YouAreWorthHell she can't bear to see her goddess in pain]], that she has to be given a ''direct order'' not to do so. What's more, it's implied that, at that point, Artemis couldn't actually see her face. They just know each other that well.
-->'''[[spoiler: Atlas]]:''' Perhaps you would like to take it for her, then? Be my guest.
-->'''Artemis:''' No! Do not offer, Zoe! I forbid you.

A sorceress who rules a island where she turns men into pigs.

* BeautyIsBad: Very beautiful, but very evil.
* DoesNotLikeMen: To the point where she turns them into rodents and keeps them in cages.
* EvilMentor: Subverted, she ''would'' have been a evil mentor to Annabeth had she accepted her offer to be her apprentice.
* KarmicTransformation: She argues this is what the men turned into pigs are victim to.
* StrawFeminist: To an absurd degree.
* WeCanRuleTogether: Offers this to Annabeth in the second book. She refuses, of course.

Atlas's daughter, who lives in exile on the island of Ogygia. She looks after Percy when he washes up onto her island, and gives him moonlace before he leaves.

* AdaptationalHeroism: She's much kinder than she is in the original mythology, where she's a seductress who kept Odysseus prisoner for years.
* AndIMustScream: Has been trapped on a island for 5,000 years with no company. Percy's one of the few visitors she's ever had.
* ILied: [[spoiler: Has this inflicted on her between the first and second series, since no one has freed her even though Percy ordered her release.]]
* MadScientistsBeautifulDaughter: She's the daughter of Atlas and supported her father in the first war, which is why she's in exile on an island in the first place.
* MisunderstoodLonerWithAHeartOfGold: Is kind-hearted and empathetic despite the lack of company.
* NiceGirl: Is depicted as genuinely caring and kind, despite her awful punishment. The [[Literature/TheHeroesOfOlympus sequel series]] plays around with this set-up, [[Characters/TheHeroesOfOlympus elaborated on over there]].
* ReallySevenHundredYearsOld: She appears to be fifteen or sixteen, although she's been around for millenia.
* UnrequitedTragicMaiden: A variation. She's doomed to always fall in love with the hero who washes up on her island, but never have her affections returned. In a particularly cruel twist, the heroes cannot leave Ogygia until she falls for them.
* WhatCouldHaveBeen: In-universe. After turning down her offer to stay with her on the island, Percy wonders what would have happened if he'd accepted it. His narration even calls her his biggest what-if.
* WomanInWhite: Mysterious, beautiful, and wears a sleeveless white Greek dress.

Son of Athena and inventor of the Labyrinth. He's also Quintus, a temporary swordsman trainer at Camp Half-Blood.
* ActuallyIAmHim: Pulls this near the end of ''Battle of the Labyrinth'' [[spoiler:when revealing that he and Quintus are the same person]].
* TheAloner: Is a rather lonely person in general, and claims to work only for himself.
* BodyJump: [[spoiler: He's put his consciousness into automatons several times.]]
* DirtyCoward: Tends to run and hide from his problems rather than face them.
* HeroicSacrifice: [[spoiler:Dies to get the Labyrinth, which is tied to his life force, to collapse, and save Camp Half-Blood]].
* MeaningfulName: [[spoiler:Quintus means "fifth" in Latin, and it's the name for his fifth body]].
* TheSmartGuy: A master inventor and a genius of his time.
* WhatTheHellHero:
** Athena pulls this on him when [[spoiler:he tricks Perdix into falling off a balcony]]. [[spoiler:To be specific, she turns Perdix into a partridge and then brands him with a mark of said partridge, which would never fade]].
** [[spoiler: Annabeth tells him that Athena's children are supposed to be wise, not just clever. He realizes she's right, leading to his HeroicSacrifice and his entrusting of his laptop to her]].

A child of Gaia and Tartarus. He was created to avenge the defeat of the Titans, but was defeated and imprisoned in Tartarus. Released in modern times by Percy on accident. He once again tries to destroy the gods and serves as a distraction for Kronos.

* TheDreaded: Feared by the Olympians more than any other threat.
* EldritchAbomination: More so than anyone else. His body is constantly shifting between every type of monster and new ones and looking at him for too long would drive a demigod insane.
* FatherOfAThousandYoung: Fathered nearly all of the major monsters.
* TheJuggernaut: Took the combined might of most of the major Olympians battling him for weeks and the last minute arrival of Poseidon and his own army to bring him down. When he first showed up to battle the Olympians in ancient times, ever god except Zeus ran at the sight of him.
* LaserGuidedTykebomb: Created to avenge the Titans' defeat and bring down the Olympians.