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Characters who appear in ''Literature/PercyJacksonAndTheOlympians''.

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[[folder:Half-bloods]]

[[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.
* 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.
* 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. Played Straight with 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.
** {{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.
* 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[=/=]LamarckWasRight: 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.

!!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 [[spoiler: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.
* {{Badass}}: At the end of the first book alone, he's defeated Ares in close quarters combat. Over the series, he becomes even more of a competent fighter.
** 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.
* BattleCouple: He and Annabeth eventually grow into this.
* BookDumb: He prefers to leave the deep thinking to Annabeth. For example, when 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''.
* ChronicHeroSyndrome: Thanks in particular to his FatalFlaw.
* 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.]]
* [[CoolBigSis Cool Big Bro:]] To Tyson
* CursedWithAwesome: A self-inflicted example, when he signs up for [[spoiler: the curse of Achilles.]]
* DangerousSixteenthBirthday
* DeadpanSnarker: Percy gets the award for being the most snarky in a WorldOfSnark.
* DontCallMeSir: He doesn't like it 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.
** [[InformedFlaw Informed Fatal Flaw]]: His big fat mouth and [[LeeroyJenkins recklessness]] get him into far more trouble.
* 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.
* HeroesPreferSwords: Percy's pretty terrible at anything ''besides'' the sword.
* HumanMomNonhumanDad: His mother Sally is a mortal, while his dad Poseidon is a god.
* 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."
* 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: Named after the only Greek hero to get a HappyEnding. It doesn't hurt that he slays Medusa (who's hacked-off head is used to get rid of his mother's husband, a "suitor") and hangs out with a pegasus.
* 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.
* NiceGuy: Good-hearted and kind, snarkiness aside.
* OlympicSwimmer: [[IncrediblyLamePun Don't try to deny it.]]
* [[OnlyKnownByTheirNickname Only Known By His Nickname]]: Virtually no one calls him Perseus, except for maybe the demon cheerleaders. 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.
* ShowyInvincibleHero: Became this in the fifth book after [[spoiler:the Curse of Achilles makes him near-immortal]].
* SkunkStripe: In the third book, he gains a gray streak in his dark hair from [[spoiler:having to hold up the sky.]] Curiously, this is never mentioned again.
* SoftWater[=/=]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.
* UnderwaterKiss: [[spoiler:In ''The Last Olympian'' with Annabeth.]]
* 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.
* UndyingLoyalty: His FatalFlaw is said to be his loyalty to his friends.
* VitriolicBestBuds: With Annabeth.
* WellDoneSonGuy: He's kind of a sucker for his dad's good opinion.
* [[WillTheyOrWontThey Will They Or Won't They]]: With Annabeth. [[spoiler:TheyDo at the end of ''The Last Olympian''. Even their fellow ''campers'' thought it was about time already]].

!!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 learning 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 Alexandra Daddario 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.
* CompositeCharacter: The first film's version of Annabeth is a combination of book Annabeth and Clarisse.
* 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.
* GrayEyes: Inherited from her mother, Athena.
* GreenEyedMonster: She's pretty obviously jealous of Percy's friendship with Rachel.
* [[HotScientist Hot Architect]]: 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
* InTheBack: Saves Percy from [[spoiler:Kelli]] by stabbing her in the back with her knife.
* [[InvisibilityCloak Invisibility Hat]]: 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.
* 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
* 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.
* [[WhyDidItHaveToBeSnakes Why Did It Have To Be Spiders]]: 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.]]

!!Luke Castellan
Son of Hermes and May Castellan. When he was an infant, his mother [[spoiler: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 [[spoiler: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]].

Played by Jake Abel in the film series.

* TheAce: Good looking, charismatic, a good fighter, and his cabin's counselor.
** BrokenAce: Too bad this hides extreme parental issues and resentment.
* 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: 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 [[BiggerBad Kronos]] is at that point SealedEvilInACan and none of the higher-ranking Titans show up until the third.
* BigBrotherMentor: To Percy in book one.
* BigManOnCampus: Seemed to be this before betraying the camp -- he was counselor of the Hermes cabin, attractive, relatively popular, and a BigBrotherMentor to Percy.
* BlondGuysAreEvil: [[spoiler:After he joins Kronos.]]
* 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.]]
* DrivenToVillainy: His bitterness at his father and the treatment of those in the Hermes cabin drive him to betray the camp.
* DemonicPossession: [[spoiler:Willingly, if reluctantly, allows Kronos to possess him as the last resort for Kronos's resurrection.]]
* 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.
* 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]].
%%GentlemanThief
* GoodScarsEvilScars: He has a scar over the right side on his face and as the series progresses, his scar becomes more bloody.
* 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.]]
* 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''.]]
%%KnightTemplar
* 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 : This is evident in his diary.
* WeUsedToBeFriends: With Thalia, Annabeth, Percy, Grover..everyone.
* 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
%%[[spoiler:YouCantFightFate]]

!!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''.
* {{Badass}}: She killed a [[spoiler:drakon]] to avenge [[spoiler:Silena's death]]. What more needs to be said?
** Who needs armor? She picks up a spear from her fallen comrade, and charges a 200 foot long [[spoiler:drakon]] wearing a t-shirt and jeans.
** BadassBoast: "I AM CLARISSE, [[spoiler:DRAKON-SLAYER]]! I will kill you ALL!"
* TheBigGirl: One of the most adept at physical combat.
* BladeOnAStick: She is never far from her electric spear.
* BloodKnight: Takes after her papa.
* TheBully: Initially. She begins to mellow down as the series goes on and she gets a boyfriend.
* 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.]]
* 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.
* LargeHam: Clarisse would like you to know that she is CLARISSE, [[spoiler:DRAKON-SLAYER]]!
* 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.''
* PetTheDog: Her concern for and friendship with Chris and Silena.
* 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.]]
* 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, [[spoiler: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.
* 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.
* 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: See ElCidPloy above.
* 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.
* 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.
* 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.]]
* 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.

* {{Expy}}: Of [[Literature/HarryPotter the Weasley twins]].
* 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.
* 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 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.
* WeUsedToBeFriends: With Luke.
* [[WhyDidItHaveToBeSnakes Why Did It Have To Be Heights]]: 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.
* BigSisterInstinct: For Nico.
* BraidsOfAction: After becoming [[spoiler:a Hunter]], she wears her hair in a braid.
* 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]].
* 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.
* 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.
* {{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 [[spoiler: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]].
* 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 Black Swords Are Better]]: 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''.
* EeriePaleSkinnedBrunette: First described as olive-skinned, but he seems to get paler and paler as the series progresses.
* 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.
* 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's can be a pretty friendly guy.
* PunnyName: Nico di '''Angel'''o.
* 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 Jackson himself]]. This is in restrospect quite visible in Nico's interactions with [[spoiler:Percy]] in the original series, as he truly behaves as if having an infatuation with [[spoiler:him]].
* 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
%%IneffectualSympatheticVillain
* 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.

[[/folder]]

[[folder:Other Camp Residents]]
!!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.

* 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.
** ThrowTheDogABone: In ''The Last Olympian'', [[spoiler: he's made a Lord of the Wild and gets a position on the Council]].
* 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: See GreenThumb.
* NiceGuy: And he retains this attitude despite being the resident ButtMonkey.
* PluckyComicRelief: More so earlier on.
* RaceLift: Is black in the movie.
* 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.

!!Chiron
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 PierceBrosnan in the film adaptation of ''The Lightning Thief'' [[TheOtherDarrin and]] Anthony Head in ''The Sea of Monsters''.

* 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
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.
* BerserkButton: Sort of. He never really seems to get angry (except at Polyphemus), but threatening harm to Percy or Annabeth is an excellent way to get him to squish you.
* 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.
* 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. [[spoiler: 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.

!!Blackjack

Percy's trusty horse, [[spoiler: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 [[BadAss cool]].
* DontCallMeSir: He feels obliged to call Percy "boss", but Percy insists that he calls him by his real name.
* JiveTurkey: ''Yo, 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.

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

* BetaCouple: With Grover.
* 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.
%%NiceGirl
* OnlyOneName
* SatelliteCharacter: She's really only significant because of her relationship with Grover.
** SatelliteLoveInterest
* WeaksauceWeakness: As with all dryads, she is basically the spirit of a tree. Kill the tree, Juniper dies.

[[/folder]]

[[folder:Mortals]]

!!Sally Jackson
Percy's mother, who can see through the Mist.

Played by Catherine Keener in the film series.

* ActionMom: As of book five.
--> '''Percy:''' Mom! When did you learn to fire a shotgun?
--> '''Sally:''' [[CrowningMomentOfAwesome About two seconds ago.]]
** The above quote comes from Chapter 18, which is aptly named [[InWhichATropeIsDescribed "My Parents Go Commando"]].
* AmazinglyEmbarrassingParents: Only in the beginning of the third book.
* BadassNormal: See ActionMom.
* BewareTheNiceOnes: 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]].
%%GenreSavvy
* 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.
* MamaBear: She might be just a mortal woman, but she never lets this get in the way of her and Percy.
* HappilyMarried: To Paul, after [[spoiler:getting rid of Gabe]].
* ParentsAsPeople: Her marriage problems are given extensive focus.
* ParentalAbandonment: Her parents died in a plane crash when she was young.

!!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. [[{{CrowningMomentOfAwesome}} 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. [[spoiler: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.
* FanNickname: R.E.D.
* 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. [[spoiler: Until she tried to become the Oracle of Delphi despite Hades's curse, and paid the price for it.]]

* AbusiveParents[=/=]ParentalAbandonment: Somewhere in the middle. She's ''there'', but she's ''not'', you know?
* [FaintingSeer: Became one.]]
* ISeeThemToo: Born with the Sight. [[spoiler: It ends badly when she tries to become the Oracle.]]
* GoMadFromTheRevelation: She went nuts after [[spoiler: trying to take in the Oracle's spirit and seeing what would happen to her son.]]
* 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.
* 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[=/=]PunnyName: 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.]]
[[/folder]]

[[folder:Gods]]

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.
* 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.
* 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.

!!Aphrodite
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.
** TricksterMentor
* 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]].
* 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.

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

* [[AbusiveParents Abusive Parent]]: It's implied that he was this to Clarisse.
* 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.
* CoolShades: Wears them as part of his BadassBiker persona.
* DumbMuscle: 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.
* 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.
* {{Jerkass}}: Ares is not that nice. He bullies his demigod children and picks fights with Percy every chance he gets.
* MyHorseIsAMotorbike: The bike is actually his chariot in modern form.
* OneManArmy: Can bless demigods and possibly mortals, temporarily turning them into one of these.
* SoProudOfYou: [[spoiler:To Clarisse, after she single-handedly kills the drakon.]]
* UnwittingPawn: [[spoiler:Of Kronos and Luke in ''The Lightning Thief''.]]

!!Artemis
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.
* 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 she seems to be more mature about it than her hunters, as shown when she [[spoiler: praises Percy and supports keeping him alive.]]
* LadyOfWar
* 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, especially Zoe
* PintsizedPowerhouse
* PolarOppositeTwins[=/=]SiblingYinYang: [[CaptainObvious Her and Apollo.]]
* SiblingSenioritySquabble: With Apollo. She's older. He cheerfully ignores this fact.
* StrawFeminist: Subverted; Percy does note how ridiculously radical she and her hunters are, but Artemis is also a goddess and hero who also can be very nice, and is not nearly as misandrist as Percy makes out at first.
* TeamMom: for the Hunters
* TokenMiniMoe: Her preferred form, as it's the same age as many of her Hunters.

!!Apollo
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[=/=]SiblingYinYang: With Artemis.
* 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.

!!Athena
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.

!!Demeter
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.

!!Dionysus
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.
* 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.]]
* 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.

!!Hades
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: Is set up as this for most of the first book, though it's eventually revealed he actually had nothing to do with the theft of the lightning bolt.
* 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."
* 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.
* 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 anything at the drop of a hat, and Poseidon hinted at having many more children than just Percy. Hades' last set of children were born in the 1920s and his lover got nuked because of it. He had no children since.]]
* 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.

!!Hephaestus
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.
%%GeniusBruiser
* 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.

!!Hera
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 this.
* KnightTemplar: For the "perfect family" ideal.
* 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: Although being the matriarch of a BigScrewedUpFamily will do that to you.
* {{Yandere}}: For Zeus. She particularly dislikes Thalia because she's the result of Zeus's infidelity.

!!Hermes
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]] 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]].

!!Hestia
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.

!!Pan
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.

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

* 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.

!!Poseidon
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.

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

Played by SeanBean in the film series.

* BoltOfDivineRetribution: Quite literally. His symbol of power is the "master bolt." The first lightning bolt and most powerful weapon in the series.
* {{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.
* 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.
* 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.
* {{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.

[[/folder]]

[[folder:Titans]]
!!Kronos
The King of the Titans and suitably the most powerful. He has domain over time and harvest.

* AbusiveParents: Yes indeed.
* 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.

!!Hyperion
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.
* {{Foil}}[=/=]EvilCounterpart: Probably accidental, but he is this for Hades - one is a god and the other is a titan, DarkIsNotEvil vs LightIsNotGood, and both their names start with "H".
* KillItWithFire[=/=]PlayingWithFire [=/=] LightEmUp: His main powers.
* LightIsNotGood: The Titan of Light (and uses light and fire-based powers), but ''very'' evil.
* ThePowerOfTheSun: As the Titan of Light.

!!Atlas
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''.
* TheBrute: Is the most physically strong of the Titans.
* KnightOfCerebus: The fight with him is the first one in the series where [[spoiler:a questmate dies.]]
* OffingTheOffspring: [[spoiler:Does this to Zoë]].

!!Krios
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.
* [[HeroOfAnotherStory Villain Of Another Story]]: ''The Lost Hero'' reveals he was off defending Mount Othrys [[spoiler: from the Romans]].

!!Prometheus
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.
* 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.

!!Iapetus
Titan of mortal life, brother of Kronos, and father of Prometheus. He appears only in ''The Demigod Files'' [[spoiler: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.

[[/folder]]

[[folder:Other Characters]]
!!Zoe Nightshade
A huntress of the goddess Artemis and her [[spoiler: former]] lieutenant. [[spoiler: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
* 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.
* TheComicallySerious: Often put in hilarious situations that highly contrast with her serious persona.
* CoolBigSis: To the younger Hunters of Artemis.
* 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 and, at one point, Percy.
* 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.
* 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]].
* StarsAreSouls: [[spoiler:She's turned into a constellation, "The Huntress", after she dies]].
* 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.
* UndyingLoyalty: To Artemis, so much that [[spoiler:she went on a quest she knew would kill her just to save her]].

!!Circe
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.

!!Calypso
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.
* [[MadScientistsBeautifulDaughter Mad Titan's Beautiful Daughter]]: 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.

!!Daedalus
Son of Athena and inventor of the Labyrinth. [[spoiler: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.
* 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]].

!!Typhon
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.
* LaserGuidedTykebomb: Created to avenge the Titans' defeat and bring down the Olympians.

[[/folder]]

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