History Characters / TheHeroesOfOlympus

* KaleidoscopeEyes: Her eyes are a mix of [[BrownEyes brown]], blue, and [[GreenEyes green]].

* BelligerentSexualTension: [[spoiler:His bickering with Will Solace in the last book is heavily implied to be this, though its ambiguous if it went somewhere]].
** [[spoiler: It went somewhere, Nico and Will are an OfficialCouple as of ''Literature/TheTrialsOfApollo'']].

** [[spoiler: It went somewhere, Nico and Will are an OfficialCouple as ''Literature/TheTrialsOfApollo'']].

** [[spoiler: It went somewhere, Nico and Will is an OfficialCouple as TheTrialsOfApollo]]

* HarsherInHindSight: All his interactions with Percy in the previous series take on a sadder tone when it's revealed in addition to his blaming Percy for Bianca's death [[spoilers: He is in love with him making it extremely confusing and painful for him considering he was just 10 and so was just starting to realize who he is and coming from a time where it is not accepted.]]

* CoolSword: Jason primarily fights with a coin that can turn into either a sword or [[BladeOnAsstick a spear]] depending on which side it lands on.

* TheDitherer: Not in general, but after his experience with Camp Half-Blood, he was more-or-less, as stated several times, 'an aimless wind' - he didn't know exactly what he wanted to be - Greek or Roman - or exactly what he wanted to do with his life, and usually he tried to please everyone. Part of his CharacterDevelopment across the books is learning to make choices on those fronts.

** She [[{{CharacterDevelopment}} later grows out of this]] and realizes that you can be feminine, charming ''and'' a BadAss.

* AuthorityEqualsAsskicking: The praetor of Rome, as well as a spear-wielding {{badass}}.

[[Literature/TheHeroesOfOlympus Return to ''The Heroes of Olympus'' page]].

Due to length, the rest of the cast[[note]]Including Gaia, the Giants, the Titans, all other monsters, the inhabitants of Camp Jupiter and Camp Half-Blood, the Gods and other auxiliary characters.[[/note]] has been moved [[Characters/HeroesOfOlympusOther here]].

The seven demigods of the Second Great Prophecy.

!!Other Demigods

[[folder:New Rome/Camp Jupiter]]

!!New Rome/Camp Jupiter

-->''"Senatus Populusque Romanus!"''

Ever since the fall of Rome in 476 AD, the demigods and legacies of Rome have lived undercover, staying alive, hunting monsters, and training demigods. At present they are based out of a warded glade in California, just north of Berkeley.

----
* AncientGrome: Utterly {{Averted}}, the Greek and Roman halves of Western civilization have been opposed since the Trojan War.
* BlingOfWar: The Legion wields weapons of Imperial Gold, which serves as their equivalent to the Greek-monster destroying metal Celestial Bronze.
* BadassArmy: The Twelfth Legion. Ten-year service is compulsory for all demigods and legacies, after which you can retire to New Rome, and even marry and raise a family.
* SuperpowerfulGenetics:
** Demigods: Children of a god and a mortal. They frequently inherit powers from their divine parent.
** Legacies: Descended from demigods. While they often don't inherit their ancestor's divine gifts, they can see through the mist and use Imperial Gold weapons. Form the bulk of the Legion.
* MenOfSherwood: The Legionnaires are skilled and powerful, regularly standing off against several times their own number of monsters.
* ShockAndAwe: The Legion's eagle standard can shoot lightning bolts. This is where the Legion's nickname of ''Twelfth Legion Fulminata'' comes from.
* SoldierVsWarrior: Roman demigods tend to lean towards Soldier, where the Greeks tend to favor Warrior. Neither side is portrayed as universally superior.

[[/folder]]

[[folder:Thalia Grace]]
!!Thalia Grace

A daughter of Zeus, lieutenant of the Hunters of Artemis, and a returning character from ''Literature/PercyJacksonAndTheOlympians''. In the first book, she is off searching for Percy alongside the Hunters, but later comes across Jason, Piper, and Leo on their quest. Thalia reveals that she is Jason's older sister, and that his disappearance at the hands of his mother had been the last straw in her stormy relationship with her neglectful mother (alluded to in the previous series).

Like Nico, Thalia keeps her powers from the previous series. Similar to her brother Jason, she can control the winds (but has a crippling fear of heights) and lightning.

----
* ActionGirl: Daughter of Zeus and lieutenant of Artemis, as well as being quite handy with a bow and arrow.
* TheAgeless: After becoming Artemis's lieutenant, she has effectively become this, remaining fifteen forever.
* [[AloofBigBrother Aloof Big Sister]]: While they're both overwhelmed about their reunion, Jason's a little hurt that Thalia seems to have distanced herself from her life before the Hunters, considering them more her family than him now.
* BackForTheFinale: She and the rest of the Hunters pop up again in the fifth book. [[spoiler: Several of the Hunters are killed off during the fight with Orion, but we hear secondhand that Thalia is alive.]]
* BigSisterInstinct: The only reason she didn't run away from her abusive mother sooner was because of Jason. [[spoiler:Their mother offering Jason as a peace offering to Hera]] was the final straw.
* CoolBigSis: To Jason, although he is physically older than she is.
* CoolCrown: The silver circlet she wears as Artemis's lieutenant pops up in every description of her, presumably because its femininity contrasts with the rest of her punk getup.
* HumanPopsicle: For a short time during the battle in the Wolf House.
* ImmortalityBeginsAtTwenty: Or, rather, a day short of sixteen.
* ImprobableAimingSkills: It's implied joining the Hunters has given her already great archery some sort of magical boost, resulting in this trope.
* IronicFear: Her fear of heights is ironic considering she's a daughter of the lord of the sky. Heck, her little brother can even ''fly'', and it's suggested that the only real reason she can't is that she psyches herself out.
* OlderThanTheyLook: She looks fifteen, but is in her twenties.
* PerkyGoth: She still dresses in black and enjoys punk rock and all, but she's much nicer than her appearance suggests.
* SiblingYinYang: With Jason, at least appearance-wise. They're actually quite similar in terms of personality.
-->'''Reyna's narration''': [She] had always thought of Jason as TheAllAmericanBoy. Thalia looked more like the girl who robbed all-American boys at knifepoint in an alley.
* WhyDidItHaveToBeSnakes: She's afraid of heights.
[[/folder]]

[[folder:Octavian]]
!!Octavian

-->''"Surrender to Rome!"''

Octavian is a legacy of Apollo, meaning he is descended from one of Apollo's demigod children. This gives him the gift of prophecy and a position at Camp Jupiter as its augur, who kills animals and interprets their innards to see the future. Due to this being set in the modern world and the impracticalities of gutting animals every time the future needs to be read, Octavian guts stuffed animals instead.

He is extremely ambitious and power-hungry, and aims to rise to the rank of praetor. He's willing to get his hands dirty in order to accomplish this, as seen when it's hinted he murdered Gwen. He also possesses a burning hatred of all Greeks, and calls for war against them. Reyna sees him as a danger to the camp, but as her nominal NumberTwo he finds ways to circumvent this.

----

* AmbiguouslyEvil: WellIntentionedExtremist or power hungry CorruptPolitician?
* AmbitionIsEvil: Dead set on becoming praetor so he can order a quest to find the Sibylline Books.
* AssholeVictim: [[spoiler: A lot of people, Greek and Roman, in-universe and out, did ''not'' feel sorry for him when he got himself launched by a flaming catapult and died. Not even his most loyal bodyguard bothered to warn him that his toga was snagged.]]
* CommanderContrarian: Disagrees with every decision Reyna makes.
* CorruptPolitician: He manages to win favor in the council by backstabbing everyone else.
* CreepyBlueEyes: He's got dark blue eyes that compliment his generally creepy appearance.
* DirtyCoward: Best exemplified in ''Blood of Olympus'', in which he intends to destroy Camp Half-Blood through blowing it up without actually having to do any work himself and still being able to claim the glory for it.
* EvilChancellor: Seems to be acting as one to Reyna, as an active advocate of war against the Greeks. She quickly puts a stop to that. [[spoiler:The moment she turns her back, he announces that they're changing their plans.]]
* EvilCounterpart: To Rachel. He serves the same oracular purpose as she does, but he's creepy and manipulative while she's straightforward and nice. They meet in the fourth book; it doesn't go over very well.
** He's also this to Will Solace, both are descended from Apollo, but while Will who is more of a medic than a seer wants to help make peace, Octavian wants to destroy the Greeks, Will explains that what Octavian was doing was Not what Apollo would want.
* FamousLastWords: [[spoiler: "Goodbye, Gaea! Goodbye, Jason Grace the traitor!"]]
* FortuneTeller: An augur, specifically, and using his insight into the future to twist Camp Jupiter politics to his advantage.
* GeneralRipper: Has this relationship towards the Greeks.
%%GenreSavvy
* HoistByHisOwnPetard: [[spoiler:In the fifth book, he dies helping to destroy Gaea. He intended to hog all the glory of defeating her for himself, but instead his clothes snag on the ammunition of the onager he fires. He was able to do something useful for once]].
* {{Jerkass}}: His rampant hatred of Greeks, hunger for power, and cruelty towards others more than qualifies him for this.
* JerkWithAHeartofJerk: Never once shows a redeeming feature.
%%ManipulativeBastard
* MeaningfulName: Shares quite a few personality traits with the original Octavian, including ambition and being a smooth talker.
* NumberTwo: The augur is right below the two praetors in the chain of command, unfortunately.
* PropheciesRhymeAllTheTime: In a series that mostly plays this straight, Octavian lampshades it by demanding that the prophecy Mars gives be cryptic and vague. [[CrowningMomentOfFunny Mars pulls out a grenade.]]
* SanitySlippage: Suffers from this to a serious degree in The Blood of Olympus when he essentially dive head first off the deep end and begins recruiting criminals to help his cause.
* {{Seer}}: Guts teddy bears to see the future.
%%TheSociopath
* TheStarscream: The traitorous second-in-command to Reyna.
* TrojanHorse: Invokes it when he advises the Romans to "beware of Greeks bearing gifts. Subverted, since that wasn't the plan to begin with.
* WarHawk: Is the most vocal in Camp Jupiter about going to war against the Greek demigods, [[spoiler:and when Leo, possessed by an eidolon, starts firing on the camp, thereby giving him a reason, Octavian eagerly jumps on it and whips the Romans into a war frenzy.]]
* WellIntentionedExtremist: Jury's still out on whether he’s this or just a power hungry bastard.

[[/folder]]

[[folder: Minor Demigods]]

!!Will Solace
A son of Apollo. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

* AngerBornOfWorry: At the end of ''Blood of Olympus'' he's upset that Nico hasn't stopped to rest after the battle with Gaea.
* AscendedExtra: He's a minor character in ''The Last Olympian'', but makes a return as a more prominent supporting character. [[spoiler:Taken UpToEleven in the last portion of ''The Blood of Olympus,'' where he partners up with Nico throughout the last battle and afterward.]]
* BackForTheFinale: Along with the rest of the Camp Half-Blood crew in ''The Blood of Olympus'', he shows up during the war scenes.
* BelligerentSexualTension: [[spoiler:His bickering with Nico in the final book comes off as this]].
* BiTheWay: [[spoiler: He does in deed get together with Nico.]]
* CombatMedic: Besides the medical skills, he's also an active participant in the final battle against Gaia and the battles in the previous series.
* CatchPhrase: Downplayed, but twice now he's used "Doctor's orders" to boss Nico around.
* MakeMeWannaShout: His father's role as the god of music lets him whistle in the ultrasonic range. It's bad enough to [[spoiler:stun the entire twelfth legion]].
%%* MasculineGirlFeminineBoy: A platonic version with Clarisse.
* MeaningfulName: His surname, Solace, contains the word "sol," which suitably for the son of Apollo, is Latin for "sun." Also, "solace" can be read as a verb, meaning that he is someone who "will solace," which corresponds with the potential of his healing talents. [[spoiler: He also brings solace to Nico di Angelo, child of death, who is perhaps more in need of comfort, appreciation, warmth, and sunshine than anyone else.]]
* TheMedic: As a child of Apollo, he's skilled with healing. He even delivered Mellie and Hedge's baby, though he was squicked out by it.
* NiceGuy: Although he has to force Nico to accept his kindness most of the time.
* NoJustNoReaction: Basically, the look on his face when a hyper Leo asks him when he will have the chance to use a sword.
** A more serious version occurs when he more or less orders Nico not to use his shadow-traveling ability.
* NonActionGuy: Admits he lacks many of Apollo's combat skills and his tactic when encountering hostile Romans is to run away and cause a diversion. It's implies this status bothers him.
--> ''Will: "I wish I was a better archer. Actually I wish I could use any of my father's gifts to stop this war. Unfortunately I'm just a healer."''
* SecondLove: [[spoiler:Implied to be this to Nico, after Percy, as of the final book]].
* ShipTease: [[spoiler: With Nico di Angelo, as of the end of ''Blood of Olympus''.]]
* SurferDude: Has the look, though his personality is more [[StarTrekTheOriginalSeries Dr. Mccoy Jr.]]
* {{Tsundere}}: His bickering with Nico makes him come across like this.

!!Clovis
A son of Hypnos.

* AnimalMotifs: He's described as looking like a baby cow.
* AsleepForDays: Because of being a child of the god of sleep.
* ButtMonkey: To an extent. The last time we see him in ''The Lost Hero,'' Butch is trying to see how many pencils he can shove up Clovis's nose. [[spoiler: Twenty.]]
* DreamWeaver: As a son of Hypnos, he spends most of his time in dreams and has a lot of power over them.
* HeavySleeper: He's very difficult to wake up.
* RunningGag: Constantly falling asleep.

!!Butch
A son of Iris.

%%TheBigGuy
* EverythingsBetterWithRainbows: His rainbow tattoo, a tribute to his mother.
* RealMenWearPink: Read: rainbow tattoo.

!!Drew Tanaka
A daughter of Aphrodite and also [[spoiler:former]] head counselor of her cabin. She also appeared in ''[[TheKaneChronicles The Serpent's Shadow]]''.

* AlphaBitch: She fits the general trademarks: snotty, beautiful (she ''is'' one of Aphrodite's daughters, after all), and always gets her way. [[spoiler:Until the end of ''The Lost Hero'', where Piper kicks her out of the role as head counselor of the Aphrodite cabin]].
* AsianAirhead: She isn't the sharpest tool in the shed, to say the least, and she's specifically described as Asian (presumably Japanese because of her surname).
* BitchInSheepsClothing: Acts nice, but it's a only a front for her rather nasty personality.
* CharmPerson: She and Piper are the only known demigods capable of charmspeaking as of now.
* EvilCounterpart: To Piper. They're both daughters of Aphrodite and have the rare "charmspeak" ability, but Drew uses it to bend the other Aphrodite campers to her will, as opposed to Piper.
* GenderBlenderName: A female camper named Drew.
* GirlPosse: Outside of camp, she has one at her school in ''The Serpent's Shadow'' of ''Literature/TheKaneChronicles''.
* {{Jerkass}}: She deliberately antagonizes everyone who isn't on her side.
* PopularIsDumb: Drew is the AlphaBitch at camp, but doesn't have the smarts to back it up.
* TheRival: To Piper in ''The Lost Hero''.
* TookALevelInKindness: Possibly. Although Piper describes her as bratty, she's apparently become at least less enough of a {{jerkass}} to be relieved at Piper's survival and return in the final book, though it's also mentioned it's "probably because [Piper] could run things and give Drew more time for gossip and in-cabin beauty treatments".

!!Mitchell
A son of Aphrodite.

* NiceGuy: He's friendly to Piper and helps her settle in at the Aphrodite cabin, even when Drew antagonizes her.

!!Lacy
A daughter of Aphrodite. Along with Drew, she appears briefly in ''[[TheKaneChronicles The Serpent's Shadow]]''.

* NiceGirl: She helps out Piper when she's new to the Aphrodite cabin.

!!Hylla
Reyna's sister, and the Queen of the Amazons. Returning character from ''Literature/PercyJacksonAndTheOlympians'', albeit a bit part.

* ActionGirl: She leads the Amazons, a job for which this trope is pretty much a requirement.
* AmazonBrigade: Leads the TropeNamer.
* AscendedExtra: Appeared very briefly in ''Sea of Monsters'' as one of the girls on Circe's island.
* AsskickingEqualsAuthority: Any Amazon can [[ChallengingTheChief challenge the queen to a duel]] if she wants to take over. It's not clear if this is how Hylla got her position, but we do know that she killed at least one strong challenger -- [[spoiler: Otrera, the resurrected first Queen of the Amazons. ''Twice''.]]
* BackForTheFinale: Shows up again in ''The Blood of Olympus'', where she and Reyna work out their family issues. [[spoiler: Her fate is ambiguous, although it is implied she survived.]]
* TheCavalry: [[spoiler:At the end of ''Son of Neptune'', she leads her army to her sister's aid.]]
* HumanMomNonhumanDad: Inverted, her mom is Bellona.
* LadyOfWar: A daughter of Bellona, which lends her a stoic, graceful air.
* RedBaron: "Hylla Twice-Kill," after [[spoiler: killing a resurrected Otrera twice.]]
* StrawFeminist: A heroic example, similar to the Hunters.
* StrongFamilyResemblance: Looks very much like Reyna.
* YouShallNotPass: [[spoiler:Pulls this on Orion in ''Blood of Olympus'', staying behind in San Juan to fight him so that Reyna has time to escape]].

!!Lou Ellen
Head counselor of Hecate Cabin at Camp Half-Blood. Makes a brief appearance in ''The Lost Hero'', but gets an expanded role in ''Blood of Olympus''.

%%* {{Adorkable}}
* BackForTheFinale: Her appearance in ''The Lost Hero'' is extremely brief, but her role is expanded greatly in ''Blood of Olympus'', where she fights right alongside Nico and Will during the climax.
* BalefulPolymorph: Can inflict this on enemies with her "pig balls".
* BlackMagicianGirl: Has the powers, and is definitely a bit of a {{Troll}}.
* {{Cloudcuckoolander}}/NightmareFetishist: For one thing, at the end of ''Blood of Olympus'' she tries to keep the group of Roman soldiers that she'd previously [[BalefulPolymorph Baleful Polymorphed]] into pigs as ''pets''.
* TheGadfly: Loves to troll her fellow campers. During the counselor meeting in ''Lost Hero'', Jason [[FunnyBackgroundEvent notices]] her using magic to play "Got Your Nose" with a fellow counselor's ''actual nose''.
* MasterOfIllusion: Like, Hazel, she can manipulate [[WeirdnessCensor the Mist]], but isn't quite as good at it.
* SquishyWizard: Powerful magician, but not much of a close-range fighter.

!!Halcyon Green
An elderly son of Apollo. He appears in ''The Diary of Luke Castellan'', from ''The Demigod Diaries.''

* BadassGrandpa: He's old, but is still veritably useful in a fight.
* HeroicSacrifice: [[spoiler:To let Thalia and Luke escape his mansion.]]
* InSeriesNickname: "Hal"
* {{Seer}}: Being a son of Apollo granted him the ability to see the future. However, after he told a girl about her future death, Apollo cursed him by taking away his voice and locking him in his childhood home.
* TragicKeepsake: [[spoiler:He kept the dagger from the girl he saved and passed it on to Luke (who would later pass it on to Annabeth).]]

!!Alabaster C. Torrington
Demigod son of Hecate, who fought for the Titans in the last war. He shows up only in ''Son of Magic'', a short story at the end of ''The Demigod Diaries''.

* AntiVillain: In the [[Literature/PercyJacksonAndTheOlympians first series]], he was one of the demigods working for Kronos.
* ArmorPiercingQuestion: After Claymore asks what happens when we die, Alabaster asks him why after all his research he doesn't know.
* {{BFS}}: According to Claymore, his sword must weigh a hundred pounds.
* CainAndAbel: The Abel to Lamia's Cain.
* HumanMomNonhumanDad: Presumably inverted, since he's a demigod and his mother is the goddess of magic.
* WelcomeBackTraitor: The reason he can't go back to Camp Half-Blood.

!!Dakota
Son of Bacchus, senior centurion of the Fifth Cohort.

* TheAlcoholic: Well, not quite...
-->'''Percy''': You let him drink ''wine?''
-->'''Hazel''': Gods, no! That would be a disaster. He's addicted to red Kool-Aid. Drinks it with three times the normal sugar, and he's already ADHD -- you know, attention deficit/hyperactive. One of these days, his head is going to explode.
* HeelFaceTurn: He defies Octavian and tries to stop the Roman siege of Camp Half-Blood
* TrademarkFavoriteFood: [[GRatedDrug Red Kool-Aid.]]

!!Clarisse La Rue

Returning character from ''Literature/PercyJacksonAndTheOlympians'', she's the head counselor of Ares Cabin.

* BackForTheFinale: Like the rest of the Camp Half-Blood crew.
* BloodKnight: Always the most eager to fight.
* DemotedToExtra: In the previous series, she was one of the most fleshed-out demigods who wasn't a regular questing partner or friend of Percy's. Here, she just gets a few moments in the first and last books.
* HonoraryAunt: Godmother to Hedge's and Mellie's son, Chuck.
* IOweYouMyLife: She is the demigod Hedge saved before going to look for his mother, and she takes that very seriously.
* MasculineGirlFeminineBoy: See Will Solace above.
* {{Protectorate}}: Mellie and her unborn child.
* WarHawk: Repeatedly advocates for the Greeks to just attack the Romans before the Romans attack first.


!!Bianca di Angelo
Nico's deceased older sister, from ''Literature/PercyJacksonAndTheOlympians''.

* PosthumousCharacter: She died in the third book of the previous series, but her death still affects Nico and his relationships.
* {{Reincarnation}}: Chose to be reincarnated by the time Nico tried to resurrect her, much to his chagrin.

!!Luke Castellan
A deceased son of Hermes, from ''Literature/PercyJacksonAndTheOlympians''.

* HeroOfAnotherStory: The other story being the previous series.
* NotSoDifferent: Percy recognizes this when he relates his feelings of resentment to Luke's in the third book.
* PosthumousCharacter: He died in the last book of the previous series, but he is still remembered and mentioned by other characters.


!!Michael Kahale
A son of Venus and centurion of the First Cohort.

* CommanderContrarian: He questions some of Octavian's decisions.
* EveryoneHasStandards: As loyal as he is to Octavian, he's sickened by Octavian reinstating Bryce Lawrence.
* NumberTwo: The second-in-command of Octavian.
* PunchClockVillain: He's a good guy, but he's very loyal to Octavian, who sponsored his entry into the legion.
* ShootTheDog: [[spoiler:He enables Octavian's [[HoistByHisOwnPetard death.]]]]

!!Bryce Lawrence
A former member of the Twelfth Legion, expelled for his sociopathic tendencies. He is a descendant of Orcus, the god of broken vows and eternal punishment. He is reinstated by Octavian and dispatched to hunt down Reyna.

* TheBrute: One of Octavian's "attack dogs."
* DraggedOffToHell: Courtesy of Nico, who turns him into a ghost and sends him straight to the Fields of Punishment.
* ScrewTheRulesIHaveConnections: He would have been executed for his crimes, but his family's influence let him off with exile.
* TheSociopath: Reyna essentially calls him one in describing his sheer remorselessness and bloodthirsty tendencies, not to mention his murder of his cohort, which was why he was expelled in the first place.

[[/folder]]

!!Other Allies

[[folder:Gleeson Hedge]]
!!Gleeson Hedge

-->''"If I hear about any funny business, I will ground you until the Styx freezes over."''

A protector and satyr.

He is introduced as being one of the teachers at the Wilderness School attended by Jason, Piper, and Leo. During the fight with the venti he is captured, and is later rescued from Medea. He later becomes the Seven's official chaperon on the ''Argo II''.

Hedge is middle-aged, and often feels the need to prove that his age doesn't make him useless. As such, he is constantly raring to fight and puts a lot of emphasis on survival of the fittest, but he's also very quick-thinking and does truly care about the heroes underneath his gruff exterior.

----
* AscendedExtra: He was mentioned by Grover in a one-liner in ''The Last Olympian'', and is now a major supporting character.
* BloodKnight: He...''loves'' violence. [[spoiler: He wasn't bothered that Leo attacked New Rome since it meant fighting.]]
* DotingParent: Shows off his new baby boy to everyone from both camps at the final victory feast.
* ExtremeOmnivore: He'll eat anything, like most satyrs.
* FaunsAndSatyrs: He's a satyr.
* FearlessFool: He acts like this, being excited to fight even if the odds of winning are next to none because it means violence.
* HappilyMarried: [[spoiler: He and Mellie got married before the ''Argo II'' departed.]]
* HiddenDepths: All the {{Badass}} BloodKnight tropes are his characterization from the first three books. In book four, [[spoiler: we learn that he and Mellie got married not long before ''Argo II'' left, that Mellie's pregnant, that Hedge still feels guilt over not running to his mother's rescue because he was saving Clarisse at the time, and that he's terrified that something will happen to his wife and baby while he's stuck on the other side of the planet.]]
%%HotBlooded
* ILetGwenStacyDie: Revealed in ''The House Of Hades'' that [[spoiler: while he was bringing Clarisse in to Camp Half-Blood, his mother contacted him in a panic. He couldn't believe anyone would try to hurt a cloud nymph, so he brought the demigod in before looking for his mother. He never found her. Lends his fears for his wife and baby just that extra edge.]]
* InterspeciesRomance: With Mellie, an air nymph.
* LargeHam: Hedge is very loud and flamboyant with his actions.
* LeeroyJenkins: He's...very ''eager'' to go into battle, even if who they're fighting is a potential ally.
* LineageComesFromTheFather: Apparently the son of a satyr and an ''aura'' is a satyr. On the other hand, all known satyrs are male and all known ''aurae'' are female, so it might be that any daughters would be ''aurae''. Hedge says his own mother was a cloud nymph.
* NoodleIncident: Apparently has nightmares about ''101 Dalmatians''.
* OfficialCouple: With Mellie.
* PapaWolf: He is terrified that [[spoiler: he won't be able to save his wife and baby, being stuck on the other side of the Atlantic. When it is suggested that he be one of the three to shadow-travel back to Camp Half-Blood in hopes of diffusing the war, he is elated.]]
* TeamDad: He's gruff, stern, and attempts to keep the Seven in line in his own way. He's also prone to grounding them.
* WouldHitAGirl: In ''Mark of Athena'', he knocks out Keto, an ocean deity, with a kick to the head.

[[/folder]]

[[folder:Festus]]

!!Festus

A dragon automaton and returning character from ''The Bronze Dragon'', an ancillary story from the previous series. At the beginning of the series, he's gone haywire as a result of Beckendorf's death. Currently the figurehead and AI of the ''Argo II''.

----
* ABoyAndHisX: With Leo.
* AIIsACrapshoot: In his first two appearances, he's crazed and violent as a result of his damaged control disk. This problem is mostly remedied by Leo later on.
* BreathWeapon: As one might have guessed, he breathes fire.
* FluffyTheTerrible: A giant, firebreathing, flying dragon automaton...named, what is essentially, "Happy." Lampshaded by Jason.
-->'''Jason''': You named him Festus? You know that in Latin, 'festus' means 'happy'? You want us to ride off to save the world on Happy the Dragon?
%%JustWhistle
* LivingShip: Seems sentient. [[spoiler: Piper manages to temporarily charmspeak Festus's head into proper sentience in ''The House of Hades'', after which the crew notes he seems more alive.]]
* OnlyMostlyDead: Sliced to pieces by lasers when he crash-lands on Midas's lawn, but this doesn't stop Leo from having Hephaestus take his head back to Camp Half-Blood so he cam become the ''Argo II'''s living figurehead.
* OurDragonsAreDifferent: A robotic one.
%%* OurRobotsAreNonstandard
* TeamPet: Jason, Piper, and Leo see him as one.
* TransformingMecha: Can fold into a suitcase-sized box for convenience. [[spoiler: And the framework of the Argo II.]]

[[/folder]]

[[folder:Ella]]

!!Ella

-->''"Words. Words calm Ella down. Words, words, words..."''

A bookish Harpy who first appears in ''Son of Neptune'' and briefly joins Percy, Hazel, and Frank on their quest to Alaska.

* AllOfTheOtherReindeer: When she's first introduced, she's being bullied and robbed of her food by the other harpies.
* ADogNamedDog: Her name is apparently Latin for..."harpy".
* BackForTheFinale: Gets a brief appearance in ''The Blood of Olympus'', and is mentioned at the end to [[spoiler: be helping with the effort to translate the Sibylline Books.]]
%%BigEater
* {{Bookworm}}: She's read a ''lot'' of books.
* {{Cloudcuckoolander}}: When she opens her mouth you may hear dangerous, world-altering prophecies...or statistics from horse-races in the 70s, tips on dog-grooming, or how many seasons ''{{Series/Friends}}'' lasted.
* CuteMonsterGirl[=/=]GorgeousGorgon: Considering harpies are supposed to be ugly old hags, Ella's [[http://4.bp.blogspot.com/-6kaT3kxqbcg/Tm9FKe1x2FI/AAAAAAAABXw/IOl9uwkSja0/s1600/Harpy.jpg rather cute]].
* [[DoesNotLikeSpam Does Not Like Cheese]]
* EncyclopaedicKnowledge: As a result of remembering everything she reads.
* HarpingOnAboutHarpies: She is one.
* InterspeciesRomance: With Tyson.
%%LivingMacGuffin
* MotorMouth: Ella is constantly talking about the things she's read.
* PhotographicMemory: A variation, with books. Ella can remember ''everything'' she reads -- just not always when you need it.
* RedIsHeroic: The only red-feathered, as well as nice, harpy seen so far.
* ShipTease: With Tyson.
%%SpeaksInShoutOuts
* TrademarkFavoriteFood: Cinnamon rolls.
* WingedHumanoid: Comes with being a harpy.
* YouNoTakeCandle: Played with. Despite her considerable intelligence, Ella speaks like this because she is a harpy.

[[/folder]]

[[folder:Arion]]
!!Arion

Son of Neptune and Ceres, and the fastest horse on the planet.

* ClusterFBomb: According to Percy, Arion has a pretty filthy mouth.
* CoolHorse: The son of two Olympians, and as a result can "run like the wind over land and sea."
%%HorsingAround
* EatDirtCheap: Arion eats gold.
* {{Jerkass}}: "I will trample you to death, silly Chinese Canadian baby man!"
* TactfulTranslation: We never hear the cursing in full because Percy's the only one who can hear it. The one time we hear him from Percy's perspective, he's too tired to cuss.
* SirSwearsALot: According to Percy.
* SmugSuper: He has an ego to match his top speed.
* SuperSpeed: [[CoolHorse Arion]] is stated to be the fastest horse on the planet. This is apparently not an exaggeration since at one point he does 800 mph.

[[/folder]]

[[folder:Bob]]

!!Iapetus/Bob

The Titan of Mortality and Lord of the West, mind-wiped by the waters of the Lethe into becoming a janitor for Hades named Bob. Returning character from ''The Demigod Files'', supplementary material of the original series.

----
* AlmightyJanitor: Literally -- he's a Titan, but doesn't remember this and works as a janitor for Hades instead.
* AmnesiacsAreInnocent: He acts very childlike and innocent.
* AmnesiacDissonance: When he remembers his past, however, he gets darker.
* AntiVillain: Implied to be this in some of Hyperion's dialogue. Granted, we don't actually get to see any of this during his debut, but then [[spoiler:he seemed more happy to rise above his former self in ''The House of Hades''.]]
* AppropriatedAppellation: [[spoiler:"I am Bob. I ''choose'' to be more than Iapetus."]]
* BecauseYouWereNiceToMe: The reason he aids Percy and Annabeth. In reality, this was thanks to Nico's doing -- he visited Bob in Hades and told him at one point that Percy was a friend.
* BladeOnAStick: His name means "The Piercer", and as both Iapetus and Bob he wields one. It's a standard spear as Iapetus, but as Bob [[MixAndMatchWeapon it's a broom with a retractable spear head at the handle end]].
* ChekhovsGunman: He only appeared in a side story to the original series, but later became incredibly important in the fourth book.
%%* FourTemperamentEnsemble: With the other Titans. He's the resident Phlegmatic.
* HeelFaceBrainwashing: Due to his dip in the Lethe in ''The Sword of Hades'', Bob's a lot nicer than your average Titan.
** HeelFaceTurn: [[spoiler: When he learns of his past as Iapetus, he initially experiences misgivings toward Percy, but ultimately decides to continue assisting them after Percy apologizes.]]
* HeroicSacrifice: [[spoiler: Decides to side with the heroes at the end, sacrificing his life so they can get out of Tartarus.]] This weighs heavily on Percy and Annabeth.
* {{Jerkass}}: [[CharacterDevelopment But only as Iapetus]]. Even then, given Hyperion's words about him [[spoiler:being the only one who felt regret about aiding in Ouranos' dismemberment, it's likely he might have been an AntiVillain]].
* KindheartedCatLover: Adopts a skeletal kitten and names it "Small Bob."
* LaserGuidedAmnesia: A fight with Percy, Thalia, and Nico ended with Iapetus getting Lethe river water splashed on his face.
* MessyHair: Described as Einstein-like.
* NiceGuy: He's kind and helpful to Percy and Annabeth, at least when in his Bob persona. [[spoiler:However, he stays nice after finding out about his past as Iapetus, choosing to put it behind him]].
* StrongFamilyResemblance: Looks like a silver version of his brother Hyperion.
* TokenGoodTeammate: Among his four brothers he seems to have been this as Iapetus, [[spoiler:having been the only one who felt regret about betraying and dismembering their father Ouranos]]. As Bob, [[NiceGuy he's without a doubt this]].

[[/folder]]

[[folder:Calypso]]
!!Calypso

-->''"The gods have placed ancient magic on this island to keep me here. A hero can leave. I cannot."''

Atlas's daughter, who lives in exile on the island of Ogygia. She looked after Percy in the original series when he washes up on shore, and has become somewhat embittered and angry after the gods bailed on their promise to release her from her isolation. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

* AndIMustScream: Has been trapped on a island for millenia with no company. The only visitors she ever mentions? Hermes, Hephaestus, Odysseus, Sir Francis Drake, Percy Jackson [[spoiler:and the unmentioned one she is telling this to: Leo Valdez]]. Odysseus was around 1000BCE, Drake the late 1500sCE, Percy [[spoiler:and Leo]] in the early 2000s. Yeah.
* AndTheAdventureContinues: [[spoiler: The very last scene of ''Heroes of Olympus'' is her and Leo departing Ogygia for parts unknown.]]
* BrokenBird: This side of her is explored more than in the previous series; as she's clearly quite bitter after centuries of being alone and under a curse, even after the gods promised to free her from it.
* {{Curse}}: [[spoiler: Indirectly inflicts one on Annabeth in ''The House of Hades'' due to her jealousy over Percy leaving her for Annabeth and bitterness over him not keeping his promise to get the gods to set her free.]]
* {{Irony}}: She curses the gods for sending her someone who she hates, and for not releasing her from her punishment despite their promises to do so. In fact it's implied the Gods arranged for Leo to free her, using the nature of her curse to ensure she winds up with someone she loves. It's even possible they ''couldn't'' free her themselves, [[EternalRecurrence due to the nature of Gods in this series.]] But that's what they have heroes for.
* LeaveYourQuestTest: The island of Ogygia, which is basically a paradise meant to trap heroes.
* LotusEaterMachine: Discussed, when she says that "time flows differently" on Ogygia.
* MayflyDecemberRomance: [[spoiler: With Leo. Though it's left ambiguous whether or not she would ''remain'' immortal outside Ogygia, with Leo indirectly bringing this up, Calypso stating that she has no idea... but whether she remains immortal, or will start aging normally, either is fine with her since she is finally leaving Ogygia.]]
* SmiteMeOhMightySmiter: Starts doing this once [[spoiler: Leo]] lands on her island, ranting about how the gods are apparently trying to make her suffer even more by sending someone who can't leave and she hates, rather than one who can (and does) but she loves. She may have engaged in this before then too. [[CaptainObvious She isn't happy that the gods haven't set her free yet.]]
* SlapSlapKiss: [[spoiler: With Leo Valdez.]]
* TookALevelInJerkass: Downplayed from her [[NiceGirl previous characterization]], with the harsh {{Tsundere}} tendencies she displays initially.
* {{Tsundere}}: Turns out to be a Type B. From what's seen of her in [[Literature/PercyJacksonAndTheOlympians the previous series]], she's a sweet and helpful NiceGirl, but she shows a cranky side [[spoiler: [[SlapSlapKiss towards Leo.]] Weirdly enough, Leo is the first person to fall in love with her.]]
* UnrequitedTragicMaiden: Enforced. She's doomed to always fall in love with the hero who washes up on her island, but never have her affections returned, and the heroes ''cannot leave until she falls in love with them''. [[spoiler:It's finally subverted when she falls for Leo, who actually reciprocates her feelings]].
* WalkingTheEarth: [[spoiler:''The Blood of Olympus'' ends with her and Leo flying off on Festus together to see the world]].
* WomanInWhite: Wears a sleeveless white Greek dress.
* Traits carried over from series one: AdaptationalHeroism, AndIMustScream, MisunderstoodLonerWithAHeartOfGold, ReallySevenHundredYearsOld, WhatCouldHaveBeen

[[/folder]]

[[folder:Damasen]]
!!Damasen

The Giant counterpart to Ares. As Ares is warlike and bloodthirsty, Damasen is peace-loving and gentle. This put him at odds with the rest of his family, who exiled him in Tartarus. By the time our heroes encounter him, he has become bitter, but they find ways around that.

----
* ArchEnemy: Designed to be one to Ares, but this backfired because by being the opposite of a violent war god, Damasen is by default a pacifist without desire to actually fight him.
* AntagonisticOffspring: To Gaea and Tartarus.
* TheBeastmaster: [[spoiler: With the Drakon at the end of the fourth book. It certainly wasn't on good terms with him before, so it's likely he was exerting some kind of magical control over it.]]
** [[spoiler: Thought it might have just been as eager to break their endless cycle of fighting as Damasen was.]]
* BigDamnHeroes: [[spoiler:Appears during the fight with Tartarus to help Bob hold him off.]]
* DragonRider: During his BigDamnHeroes moment.
* CynicismCatalyst: Inverted. [[spoiler:Seeing the formerly brutal Iapetus rebel against Gaea convinced him that he, too, could change his fate.]]
* TheExile: Trapped in Tartarus for an eternity.
* FateWorseThanDeath: Exiled in Tartarus for thousands and thousands of years, forever locked in combat with the Maeonian Drakon.
%%GeniusBruiser
* HairDecorations: Like the other Giants, but instead of trophies of war, he has grass, leaves and flowers braided in it, reflecting his peaceful nature.
* HeroicSacrifice: [[spoiler: Takes on Tartarus to buy Annabeth and Percy time to escape.]]
* LetsGetDangerous: [[spoiler:Delivers an awesome speech to this effect whilst battling Tartarus.]]
--> '''Damasen:''' [[spoiler:Father, you wished for a more worthy opponent? I am one of the Giants you are so proud of. You wished me to be more warlike? Perhaps I will start by destroying you!]]
* TheMedic: Cures [[spoiler: Percy of gorgon-blood poisoning.]]
* NiceGuy: Because Ares was such a BloodKnight, Damasen ended up being this. His temperament seems to have soured somewhat in the present day, but really, [[FateWorseThanDeath can you blame him?]]
* NoGoodDeedGoesUnpunished: For ending the Drakon's rampage through Maeonia (present-day Turkey), he was exiled to Tartarus.
* RedIsHeroic: Has rust-colored hair and cherry-red skin.
* TokenGoodTeammate: To the Giants.
* YouCantFightFate: Initially a believer in this, but Percy and Annabeth change his mind.
* YouShallNotPass: [[spoiler: Against Tartarus, allowing Percy and Annabeth to escape through the Doors of Death.]]

[[/folder]]

[[folder:Other Allies]]


!!Lupa

Trainer of Roman heroes.

%%ActionGirl
* ADogNamedDog: Her name is the Latin word for "she-wolf".
* GoodIsNotNice: She's ''very'' gruff and stern, and passes this on to her proteges.
* NobleWolf: Heroic but not nice.
* SinkOrSwimMentor: Lupa believes that experience is the best teacher -- which is why she basically dumps her kids within fighting range of monsters to see how they do.
* TeamDad: Female example. In contrast to Chiron, who's more hands-on, Lupa is more militaristic and indifferent to the demigods she trains -- although she does care deeply about the wellbeing of Rome.

!!Grover Underwood
A Protector. He's a close satyr friend of Annabeth and Percy and a member of the satyr council. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

* DemotedToExtra: He's one of the main characters in the [[Literature/PercyJacksonAndTheOlympians previous series]], but has a much smaller role in ''Literature/TheHeroesOfOlympus''. The most he gets is some mentions, an appearance in a dream in ''Son of Neptune'', an appearance alongside Rachel in ''The House of Hades'', and a few cameos in ''The Blood of Olympus.''
* HeterosexualLifePartners: With Percy; he shares an empathy link with him.

!!Chiron

Trainer of Greek heroes. Returning character from Literature/PercyJacksonAndTheOlympians.

* BackForTheFinale: Appears in ''The Blood of Olympus'' during the scenes set in Camp Half-Blood.
%%CoolOldGuy
%%CoolTeacher
* DemotedToExtra: He's a major character in the previous series, but in this one, he appears only in ''The Lost Hero'' and ''The Blood of Olympus''.
* MrExposition: Brings Piper, Jason, and Leo up to speed with their heritage and current events.
%%TeamDad

!!Mellie
Former personal assistant to Aeolus. At the end of ''The Lost Hero'', she replaces Jane as Tristan [=McLean=]'s secretary.

* GenkiGirl: As an air nymph, she's very perky and cheerful.
* HappilyMarried:[[spoiler: She and Hedge got married before the ''Argo II'' departed.]]
* InterspeciesRomance: With Hedge.
* RightHandHottie: To Aeolus. She's considered very beautiful.
* WomanInWhite: Wears a white dress.

[[/folder]]


!!Gods

[[folder:General]]
The Myth/ClassicalMythology pantheon, featuring more gods than it did last time. As a note, names are written in this form: '''Greek Name'''/'''Roman Name'''.

* AlternativeCharacterInterpretation: The Roman aspects are this InUniverse -- the Romans saw the gods differently than the Greeks did, after all.
* AntagonisticOffspring: Most of them (except for the extremely primordial ones) to Kronos, then to Gaea.
* AscendedExtra: Many of the minor gods, who were just offhand mentions or nonexistent in the previous series, play large roles this time. This can double as ShownTheirWork, since many of the Roman gods ''did'' have notably different jobs and personalities than they did when they were Greek. See Ares/Mars, Athena/Minerva, and Artemis/Diana for the most extreme examples. Juno, in particular, played a larger role in Roman public and cultural life than Hera did to the Greeks. Vesta was the guardian of Rome (and keeper of the Aegis), while Hestia is almost forgotten.
* BackForTheFinale: The Olympians -- some of whom haven't been seen since the last series -- show up again in ''The Blood of Olympus.''
* BigDamnHeroes: [[spoiler: The Olympians show up just in time to help the Seven defeat the giants.]]
* BrokeYourArmPunchingOutCthulhu: They're in no shape to defeat the giants because they're still recuperating from the last Titan war, with divine schizophrenia from their Greek and Roman sides as icing on the cake.
* DemotedToExtra: Most of the major gods from the last series are laying low this time around, due to the chaos caused by their split personalities.
* JerkassGods: As bad, if not worse, than before. A few, like Iris and Thanatos, are exceptions, however.
* HaveYouSeenMyGod: Olympus is closed and the gods have gone MIA per Zeus's orders.
* InhumanlyBeautifulRace: Unless otherwise stated (like in Akhlys's case), or if the narration says they cross into UncannyValley despite their beauty, you can expect a god's preferred form will be extremely easy on the eyes.
* SplitPersonality: Between their Greek and Roman sides, although how bad it is tends to vary -- some of the major gods are so incapacitated they have to lay low in order to not inconvenience the world. Other gods, such as Aphrodite and Nemesis, are hardly affected because of their "universal" domains.
* TimeAbyss: They've been around since before the fall of the Titans, as they represent humanity's concepts.
* VoluntaryShapeshifting: The gods can take any form they want.

[[/folder]]

[[folder:Olympians]]

!!Hera/Juno

-->''"You must forge your own path for it to mean anything."''

The goddess of marriage, women, and motherhood, as well as Queen of Olympus and Zeus's sister-wife. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

Hera plays a bigger part in this series than she did in the last one -- while still being somewhat petty and vengeful, she's more than willing to work together with demigods if it means toppling Gaea. It's revealed she's been running a gambit to stop Gaea since long before the first series, moving our heroes into place and plotting to unite the Greek and Roman camps even if it means defying her husband's will.

She is kidnapped before ''The Lost Hero'', and the objective of that book's quest is to free her. She appears again at the beginning of ''The Son of Neptune'', where she brings Percy to the Roman camp.

----

* AscendedExtra: She's a secondary character at best in the previous series, but is much more important in this one.
* BabysitterFromHell: For Leo.
* CharacterDevelopment: Compared to how she was in the previous series, she's far nicer to demigods. She's shown Jason AND Percy respect and even been supportive, not even getting mad when Percy was basically chewing her out in his dreams. While Jason has some leeway as his PatronSaint, Percy has only the fact that he's one of the seven, and while she could try to boss him around, she's being pretty nice about everything. Though of course you would be nice to a demigod who requested the gods pay more attention to their children (bringing family closer) after saving Olympus. She extended Frank's life as well.
* TheChessmaster: She's been putting her pieces into place for over seventeen years.
* DamselInDistress: In ''The Lost Hero'', she's held prisoner in a cage at the Wolf House that utilizes her power to awaken Porphyrion and consequently Gaea, hence Jason, Piper, and Leo have to free her.
* DisproportionateRetribution: She seems fond of insane punishments, especially for children of Zeus.
-->'''Thalia''': Save it! [[WickedStepmother You've been nothing but a curse to every child of Zeus for ages]]. [[ContinuityNod You sent a bunch of intestinally challenged cows after my friend Annabeth]]!\\
'''Hera''': She was disrespectful!\\
'''Thalia''': You dropped a statue on my legs.\\
'''Hera''': It was an accident!
* GambitRoulette: She seems to be pulling this considering the whole Jason/Percy switch was her idea. Bonus points for working on this long before the first series, considering her actions with Frank and Leo.
* KarmaHoudini: When Piper is both shocked and disgusted to learn Hera caused Hercules to murder his family, but Hercules was the one punished for it, the river god Achelous sadly notes Olympians rarely pay for their crimes.
* OnlySaneWoman: Presented as this in ''The Lost Hero''. She is stated to be the primary peacekeeper on Olympus and proposes the compromises that keep Olympus from falling apart thanks to her focus on family and duty. With her missing the egos and personality quirks of the other gods threaten to tear the world apart unless she is returned.
* PatronSaint: For Jason. And of Rome in general.
* QueenIncognito: Juno briefly pretends to be an old hippie lady dressed in trash bags when she dishes out her SadisticChoice to Percy. She drops the act once they make it to Camp Jupiter.
* RunOrDie: [[spoiler: The new war has resulted in her being forced to flee from not only the giants, but the gods as well since she's trying to bring the Greek and Roman demigods together. This is because conflict between the two camps lead to severe conflict between the Greek and Roman identities of the gods, the most obvious side effect of which is excruciating pain.]]
* TeethClenchedTeamwork: She knows several demigods (such as Annabeth and Thalia) ''don't'' like her, but they're going to have to work together to defeat Gaea and the giants.
* WickedStepmother: To all children of Zeus/Jupiter, but startlingly inverted towards Jason. Jason's birth was apparently the last straw for Juno, and Jupiter promised her Jason's life to placate her, naming him after her favorite hero. [[spoiler: Why wouldn't Hera be nice to a demigod son of Zeus on the eve of the Gigantomachy? during the last one, Porphyrion nearly raped her until Hercules managed to kill him, which is what caused Hera to accept him in the first place. Maybe she just wants to be sure she'll be saved again.]]

!!Ares/Mars

-->''"I’m the god of Rome, child. I am the god of military might used for a righteous cause. I protect the legions. I am happy to crush my enemies underfoot, but I don’t fight without reason. I don’t want war without end."''

The God of War and a returning character from ''Literature/PercyJacksonAndTheOlympians''. Mars is a mature, respected, militaristic god and draws an unflattering contrast between himself and his Greek form, who is a petty {{jerkass}}. He's also Frank Zhang's father, which Frank isn't very proud of.

----

* BloodKnight: Subverted as Mars. He’s not about endless bloodshed without resolution.
* BootsOfToughness: Ares wears them as part of his BadassBiker guise, while Mars wears them as part of a uniform.
* CharacterDevelopment: He's considerably less of a straight-up {{jerkass}} in ''Son of Neptune'', at least in regards to his son. Justified, considering that Mars is held in much higher regards to the Romans than Ares to the Greeks (the Spartans are an exception).
* ColonelBadass: Mars's preferred form.
* DotingParent: Compared to how Ares treated Clarisse, his Roman counterpart nearly rivals Poseidon.
* EverybodyHatesAres: Averted, he's a mature, dignified, militaristic warrior whom the Romans highly revere. Truth In Television, as Mars was considered the second greatest god after Jupiter.
* HiddenDepths: One might expect that a war god is nothing but a brutal BloodKnight, but Mars is actually very smart and kind of nice. His WhatTheHellHero speech to Percy in The Son of Neptune is impressive: Mars is the god of war ''for a just purpose.'' Ares just likes to brawl. It's the difference between Special Forces and a biker gang. In particular interest is when he gives his son Frank a copy of Sun-Tsu's The Art of War. Percy's response? "I don't think Ares can read."
* ObfuscatingStupidity: Pretends to not remember who Percy is in front of the Romans even though Frank can tell he’s lying.
* PetTheDog: [[spoiler: Keeps Grandmother Zhang company while she’s waiting for Frank to come home one last time.]]
* SoProudOfYou: Mars grants Frank his blessing in the fourth book, something he only does to children he's ''extremely'' proud of (like Clarisse in the previous series). Well-deserved, as Frank had just killed 200+ monsters with poison breath and poison gazes single-handedly.
* VitriolicBestBuds: Acts like this with Percy, who's probably a lot more appealing to Mars than he was to Ares.

!!Athena/Minerva

-->"''Yes, my children will avenge me.''"

Goddess of wisdom, craftsmanship, and tactical warfare. Annabeth's mother, as well as a returning character from ''Literature/PercyJacksonAndTheOlympians''.

If you thought the personality contrast between Mars and Ares was bad, wait till you see Athena and Minerva. While the former was portrayed in the series as dignified, wise, and cautious, Minerva is furious at the Romans for devaluing her as a war goddess [[note]] the Romans despised defensive maneuvers and only fell back on them as a last resort [[/note]] and for stealing her statue, the Athena Parthenos. When she appears, she is RevengeBeforeReason incarnate, saying that the Romans must die for the disgrace.

----

* AbusiveParents: Not normally, but in ''Mark of Athena'', she shows an incredibly nasty side towards her daughter. [[JustifiedTrope Justified]] in that she was suffering from divine schizophrenia as a result of the Greek-Roman war, like most of the other gods. On top of the stress breaking down her usual logic, Athena has just had all her hatred of Rome stirred up again. She seems to have returned to normal in the final book, where she [[spoiler:fights alongside Annabeth to defeat Enceladus]].
* {{Chickification}}: InUniverse. As a Greek goddess, she had a major role and was a strong warrior. However, the Romans made her a minor goddess who only made crafts, which enraged her. It didn't help that they also stole her statue and hid it for centuries.
* DisproportionateRetribution: The Romans turned her from a major goddess to a minor one and offended her as a warrior. In addition, the Romans stole the grand statue of Athena from her temple in Greece and have hidden it for centuries. She wants all Romans killed in response and has her children keeping the grudge between the two sides going strong.
** Also, in regards to Arachne. Annabeth states that Arachne is a better weaver when compared to Athena, but her true crime was insisting she was better since it was a sign of hubris against the gods. Even then Annabeth thought turning Arachne into a spider was going too far. Going by other comments, Athena is prone to this when someone claims or "is" better than her at something whether it is true or not or is one of her own children.
* [[EntitledBastard Entitled Bitch]]: Her conversation with Annabeth was just straight up emotional abuse.
* ItsAllAboutMe: Her Roman mode, at the very least, seems to be of the opinion that retrieving her statue is of the utmost importance, to hell with any toes she might step on the way. [[spoiler:As it turns out, it could be crucial to keeping the peace between the camps.]]
* KarmaHoudini: She is the cause of thousands of years of bloodshed between the Greek and Roman demigods and all of the lives that have been hurt because of it or dragged into it or the wars that were increased because the demigod conflict got involved all over a statue. She is never held accountable and in fact gets her statue back.
* LadyOfWar: Greek only. This is a major reason for her DisproportionateRetribution.
* ReasonableAuthorityFigure: She had nothing against Percy while voting him to be killed to stave off the Big Three prophecy and actually consented to Percy/Annabeth (though she does threaten Percy if he mistreats Annabeth.) This does not apply to Romans.
* RevengeBeforeReason: To the Romans. Percy's scared of her because this is usually inverted.
* SoreLoser: Is seen as this by Arachne, although whether or not she actually ''was'' one at the time is...[[UnreliableExpositor confusing]].
* UngratefulBastard: The half-serpent, immortal Kercrops was the first king of Athens, judged the contest between Athena and Poseidon, and ruled in her favor. Athena eventually drove him and his people underground in favor of humans and drove his daughters mad so they flung themselves off a cliff.

!!Aphrodite/Venus

-->''"Beauty is about finding the right fit, the most natural fit. To be perfect, you have to feel perfect about yourself -— avoid trying to be something you're not. For a goddess, that's especially hard. We can change so easily."''

Goddess of love and beauty, who plays a bigger role this time around. Mother to Piper, as well as a returning character from ''Literature/PercyJacksonAndTheOlympians''.

Aphrodite is seemingly unaffected by the SplitPersonality ravaging her fellow Olympians. She attests this to love being the same being Greek and Roman or anything else, and while she keeps the giggly, teasing, temperamental demeanor from the previous series, she hints at a steely competence and a deep empathy for those around her.

----

* AmazinglyEmbarrassingParents: For Piper in ''The Mark of Athena'', where she goes on about romance in front of her, Annabeth, and Hazel.
* AppearanceIsInTheEyeOfTheBeholder[=/=]EmpathicShapeshifter: As in the previous series, her appearance depends on the viewer's perception of ideal beauty.
* LoveFreak: Unsurprisingly, she's very passionate about her domain.
* LoveGod: One of the most famous examples.
** HotGod: Naturally, as she modifies her appearance to fit the viewer's perception of ideal beauty.
* ObfuscatingStupidity: She only ''pretends'' to act like a vapid, giggly klutz.
* ProudBeauty: She's very proud of her attractiveness.
* ShipperOnDeck: Even ''more'' than in the last series -- she doesn't care to hide it for ''anything''. Add Jason/Piper to her list of ships.
-->'''Aphrodite:''' Paris and Helen were a cute couple...
* SplitPersonality: [[AvertedTrope Averted]]. Love is the same no matter Greek or Roman, so she's not as affected. It also doesn't hurt that she's the oldest Olympian, closer to creation than even the Titans!

!!Dionysus / Bacchus

-->''"Did someone just call me the wine dude? It’s Bacchus, please. Or Mr. Bacchus. Or Lord Bacchus. Or, sometimes, Oh-My-Gods-Please-Don’t-Kill-Me, Lord Bacchus."''

Head of Camp Half-Blood, but currently incapacitated due to the split personality issues mentioned above. That said, Bacchus is far more jerkish and unreasonable than Dionysus, which isn't really saying much. His Roman form slew two giants as a demigod. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

----
* TheAlcoholic: Although as mentioned in the previous series, he's forcibly off the bottle. Bacchus drinks Diet Pepsi instead (versus Dionysus, who drinks Diet ''Coke'').
* DemotedToExtra: His Greek form, who was previously the SupportingLeader of Camp Half-Blood.
* {{Jerkass}}: The biggest one of all the Roman gods so far. All of the faults of Dionysus magnified to the point he refused to "help" without a huge tribute. Once he has it, he forces to Jason and Percy to fight the giants AGAIN for his entertainment and only after they have once again killed them does he bother to banish them.
* MilesGloriosus: Boasts about fighting in the first giant war barely remembering that Hercules did most of the work and he himself defeated the weakest giants. Later, talks as if his killing Otis and Ephialtes was a major victory for him.

!!Apollo

God of the sun, music, poetry, and prophecy, and patron of the Oracle of Delphi. Twin brother to Artemis. With the onset of the Greco-Roman war, Apollo is trapped with his sister on their home island of Delos, where they are safe from the gods' identity crisis, but unable to lend any assistance.

----
* AppealToVanity: [[DeceptiveDisciple Octavian]] convinced him to give his blessing by flattering him and promising to make him the favored god of the Romans. Leo uses a similar tactic to get his help later.
* BiTheWay: His own book reveals that he has no problems with dating boys or girls for as long as they please him [[spoiler: a trait shared by his son Will.]]
* DumbBlond: He usually takes the form of a blond-haired teen, and he's very easily manipulated.
* FoolishSiblingResponsibleSibling: The Foolish to Artemis' Responsible.
* HeroOfAnotherStory: The sequel series, ''Literature/TheTrialsOfApollo'', has him as a main character.
* MisBlamed: In-universe. Zeus holds Apollo responsible for the Prophecy of Seven coming to pass, since Rachel Dare spoke it immediately after he blessed her with the power of the Oracle. Zeus ignores the fact that the Romans had the prophecy for centuries.
* NotThatKindOfDoctor: While his domains do include medicine, the specific skills required to create [[BackFromTheDead the physician's cure]] fall under the purview of his son Asclepius.
* {{Narcissist}}: Apollo regards himself as perfect and deserving of all praise and being above the other Olympians, including Zeus. He views demigods as tools to make himself look good and is willing to kill them without hesitation if he thinks it will benefit him. The only people he cares about are his mother and sister Artemis. The latter is the only one he is shown to respect and listen to. This bites him big time whenever he angers Zeus, who is more powerful than him.
* {{Pride}}: Apollo has an excessively high opinion of himself and abilities even when compared to other major gods. This gets him in major trouble in the last book.
* SealedGoodInACan: While on Delos, the twins are free of [[SplitPersonality the madness caused by the demigod schism]], but unable to affect the outside world.
* ThatThingIsNotMyChild: Octavian is his descendant, a fact that Apollo openly laments in ''Blood of Olympus.'' He wishes he could have Frank as a son instead.
* TemptingFate: From ''The Last Olympian'': "Percy, I wouldn't worry too much. The last Great Prophecy about you took nearly seventy years to complete. This one may not even happen in your lifetime." Fast forward a year, give or take, and Percy's in the middle of another Great Prophecy, the onset of which Zeus blames Apollo for.
* UnwittingInstigatorOfDoom: He gave his blessing to Octavian's plans to make Rome strong again, without realising that his descendant planned to wage war on the Greeks, making him partially responsible for the gods' incapacitation.
* WhatHappenedToTheMouse: He's confined to Olympus once the Giants are defeated. Since the power of prophecy has yet to return by the end of ''Blood of Olympus'', his fate, and that of the Oracle of Delphi, remain a mystery to the heroes.

!!Artemis
Goddess of the moon, the hunt, and maidens. Twin sister to Apollo. Trapped on Delos with her brother.
----
* DaddysGirl: Zeus has always favored her over Apollo.
* FoolishSiblingResponsibleSibling: The Responsible to Apollo's Foolish.
* ForcedToWatch: She can't leave Delos without succumbing to [[SplitPersonality madness]], so she can do nothing to save her Hunters from being massacred by Orion.
* SealedGoodInACan: Leaving Delos while the demigods are at war will drive her mad.

!!Poseidon/Neptune
God of the seas and earthquakes, as well as Percy's father.

* DemotedToExtra: In the last series, he featured more often due to him being Percy's dad, but Percy mentions that the last time he'd seen his father was [[Literature/PercyJacksonAndTheOlympians on his sixteenth birthday]]. He [[BackForTheFinale finally appears]] in ''The Blood of Olympus''.

!!Hades/Pluto

Ruler of the Underworld and father of Hazel Levesque and Nico di Angelo. Has since been given a seat on the divine council after the events of the last series. He laments the unhappy fates of his children.

* CharacterDevelopment: In the previous series, he was angry and resentful, and downright abusive to Nico, tricking him and telling him how inept he was compared to Bianca. Since then, he's recognized that Nico was right and tries to get Nico to let go of his anger, too.
* DaddyHadAGoodReasonForAbandoningYou: He doesn't directly acknowledge Hazel after she comes back to life, with others speculating it's so he doesn't have to enforce his own rules and send her back to the Fields of Asphodel. Uniquely, he is also one of the few godly parents who doesn't choose to abandon his kids. Hazel's mom refused him.
* DotingParent: More to Hazel (as Pluto) than to Nico, Queen Marie talks about how proud Pluto was of baby Hazel, and Hades is coming around. (He gave Nico a zombie!)
* MasterOfIllusion: Pluto shows some skill with Mist manipulation.
* ParentalFavoritism: It's clear he preferred Bianca over Nico, but he's learning to move past this.

!!Zeus/Jupiter
Lord of Olympus and god of storms, hospitality and justice. He sealed up Olympus before the start of the series, believing it would lull Gaea and the giants back to sleep. The other gods believe it more due to wounded pride at having demigods fight the Titans better than the Olympians and Percy rejecting his offer of immortality. He appears toward the end of ''Blood Of Olympus'' to aid in the final battle.
----

* BoltOfDivineRetribution: Wields the Master Bolt in battle against Porphyrion.
* HeadIntheSandManagement: How the other gods feel he is treating the giant threat.
* ImmortalImmaturity: Jupiter is supposed to be a more responsible and mature version of Zeus. However, every story or action attributed to him paints him as virtually the same: a narcissistic, spoiled brat who lets his temper rule him and blames others for his mistakes.
* JerkAss: His father-son moment with Jason is ruined by returning to this behavior.
* ItsAllAboutMe: Both Jupiter and Zeus hold this view and tend to let it decide things for them letting hurt pride lead to closing Olympus and blaming others for the disaster of the Second Gigantomachy to avoid looking bad. All that keeps him from being easily a textbook {{Narcissist}} is he shows a degree of empathy for others Apollos lacks and his status as king and being more powerful than pretty much anyone else somewhat justifies his attitude.
* KarmaHoudini: Once again he is the source of numerous problems in the series, but any attempts to hold him accountable fail since he is the most powerful of the Olympians.
* NeverMyFault: Zeus blames Apollo and Hera for the second giant war. He claims that Apollo appointing a new oracle who revealed the prophecy, and giving his blessing to Octavian sped up the prophecy, the rise of the giants and the war between the Roman and Greek demigods. He blames Hera for her meddling, which narrowed the possibilities on how the prophecy could have unfolded. He is only partially right since Apollo's blessing ignited the war, and the Fates agree his stance on Hera is somewhat right, However Apollo has little control over new oracles and cannot always control when a prophecy is spoken. On Hera's part, several of the giants had already risen before any of the Seven were born or were even assembled. Following Zeus' plan of doing nothing would have had Porphyrion rising at full strength, Hera no more, and Olympus imploding without her to hold the Olympians together.
* {{Pride}}: Stated to be a long running problem with both his Greek and Roman aspects others often have to work around.
* UngratefulBastard: Can cough up a "Good job, son" to Jason, but becomes furious with him for daring to question his blaming of Apollo and Hera.
[[/folder]]


[[folder:Wind Gods]]

The various winds.

!!Aeolus
King of the winds, weatherman of Olympus.

* AscendedExtra: Was mentioned in ''The Last Olympian'' as the one defending the skies of Olympus.
%%BewareTheSillyOnes
* BlowYouAway: He's the most powerful wind god, and as such has domain over winds.
* {{Cloudcuckoolander}}: Being the weatherman of Olympus 24 hours a day will do that to you.
%%PointyHairedBoss
* UncannyValleyMakeup: He was described by Jason as a microwaved Ken doll.
%%UnwittingPawn: To [[spoiler:Khione.]]

!!Boreas / Aquilon
The North Wind.

* AffablyEvil: Definitely not the most antagonistic of the gods, but there's a clear undercurrent of cruel excitement in his discourse with Piper and Jason.
* ArchEnemy: To Notus.
* BackForTheFinale: [[spoiler: Per tradition, appears as one of the winds pulling Zeus's chariot in the finale.]]
* CanadaEh: He and his family live in Quebec, Canada.
* FaceHeelTurn:[[spoiler: Between appearances, Khione seems to have turned him to Gaea's side. Though this could just be her manipulating his fragile state of mind and body, as he's back on the gods's side by the finale.]]
* FrenchJerk: Of the French-Canadian variety, actually.
* AnIcePerson: Because he lives in Canada, he is far colder.
* UnwittingPawn: To [[spoiler:Khione.]]

!!!Khione
Boreas's daughter, the goddess of snow.

* TheBusCameBack: She and her brothers make a reappearance in the fourth book.
* BerserkButton: Never mention GlobalWarming around her.
* BitchInSheepsClothing: She acts nice, and then her true personality is revealed...
* TheDogWasTheMastermind: [[spoiler: Gaea's agent among the Wind Gods.]]
* TheDragon: Seems to be Boreas' main second-in-command and is much more competent than Zetes and Calais.
%% DragonWithAnAgenda
%%FauxAffablyEvil
* AnIcePerson: Displays the greatest prowess in this among the North Winds.
%%IceQueen
* ManipulativeBitch: Oh, so very much. By the fourth book, she's successfully played Zeus, Hera, and Aeolus for chumps, and [[spoiler: convinced Boreas and her brothers to serve Gaea.]]
* TheMole: [[spoiler:For Gaea among the wind gods.]]
* SpannerInTheWorks: [[spoiler:Thanks to her and her brothers' interference, the ''Argo II'' is blown into North Africa and Leo is stranded in Ogygia. Eventually this is all rectified, but the crew loses a lot of time.]]
%% TheStarscream
* UnderestimatingBadassery: [[spoiler:Shouldn't've dismissed Piper so easily, huh?]]
* WinterRoyalLady: The goddess of snow.
* WomanInWhite: Wears a white silk gown.

!!!The Boreads

Zethes and Calais, Boreas's sons and Khione's brothers.

%%AffablyEvil
* BackForTheDead: Though they can't technically ''die'', [[spoiler: their second appearance sees them ''soundly'' whupped by Piper.]]
%%FaceHeelTurn
* HulkSpeak: Cal, who can't say words of more than two syllables and is generally not a fan of sentences.
* {{Jerkass}}: Zethes is one of the oiliest and most egotistical characters in the series.
* VillainousCrush: Zethes makes it rather obvious that he's interested in Piper.
* WhiteHairBlackHeart: Both have stark white hair.

!! Notus/Auster
The South Wind.

* ArchEnemy: To Boreas.
* BackForTheFinale: [[spoiler: Cameos while pulling Zeus's chariot in ''The Blood of Olympus.'']]
* BrickJoke: During Boreas' rant about Notus in the first book, he makes an offhand mention of his holiday retreat in Cancún. When Notus makes his appearance in ''The House of Hades'', he too says that he has a lovely place in Cancún during the off-season.
%%[[ChekhovsGunman Chekhov's Gunman]]
* EmpathicShapeshifter: While talking with Jason, his form switches repeatedly between his two identities, mirroring [[spoiler:[[TwoRoadsBeforeYou Jason's confusion about whether he belongs with the Greeks or the Romans]]. When he throws his lot in with the Greeks, Notus's form solidifies for good.]]
* HotBlooded: Notus.
* TwoRoadsBeforeYou: Auster hates indecisiveness, and insists that he won't help Jason until he decides [[spoiler:between Greek or Roman.]]
* RedOniBlueOni: The Greek and Roman facets of his identity, respectively. Notus is thunderous and ill-tempered, whereas Auster is sluggish and lazy.
* SmallRoleBigImpact: At least as far as Jason is concerned, he's the one who solidifies Jason's decision to [[spoiler: go Greek]].

!!Zephyros/Favionus
The West Wind, a servant of Cupid.

* BackForTheFinale: [[spoiler: Pulls Zeus's chariot in ''The Blood of Olympus.'']]
* IfICantHaveYou: Was in love with [[PrettyBoy Hyacinthus]] and was jealous of the god Apollo's closeness to him, so when Apollo and Hyacinthus were playing a game Zephyros arranged for the disc to strike Hyacinthus. He doesn't seem too hung up about it, though.
* MysteriousStranger: With a bit of TheWatcher, he says that he's been watching Nico for years, knowing that one day he'd have to return to Split and face Cupid.
* WingedHumanoid: His preferred form has two large wings.

[[/folder]]

[[folder:Other Gods]]

!!Thanatos/Letus
The god of death.

* CompellingVoice: His voice is deep and sonorous.
* DistressedDude: In ''Son of Neptune'', the whole point of Percy, Hazel, and Frank's quest is to rescue him from Alcyoneus.
* DontFearTheReaper: Not particularly gentle and a ScaryBlackMan with some shades of TheStoic, but obviously not malicious or cruel.
* GoodWingsEvilWings: Has a pair of black angel wings, specifically.
* TheGrimReaper: As the god of death, this is essentially his job.
* NumberTwo: Lieutenant of Pluto (Hades). Thanatos acts as border control to keep souls from crossing between life and death without his permission.
* PrettyBoy: Hazel calls him the prettiest man she's ever seen.
* ProductPlacement: Uses an iPad to keep track of the dead.
* ScaryBlackMan: Somewhat, although he's just doing his job.
* TheStoic: Merciless and seemingly emotionless.
* WingedHumanoid: His preferred form has a pair of large black wings.

!!Terminus
The Roman god of boundaries.

* BarrierWarrior: He’s the last line of defense for New Rome.
* BerserkButton: When people don’t follow rules, Terminus gets very, ''very'' angry. Also, do not contradict his belief that his statue has arms.
* ButtMonkey: People like to crack jokes at his expense.
* ChekhovsGunman: Just there for comedy relief? Think again.
-->'''Percy:''' ''(to Polybotes)'' This is Terminus. He's a god. '''*WHAM*'''
%%* TheComicallySerious
* HeartIsAnAwesomePower: He has jurisdiction over borders, and this is used in the fight against Polybotes.
%%{{Jerkass}}
* SuperOCD: He'll completely blow if one even toes a border inappropriately. [[SarcasmMode Part of his charm.]]

!!Iris/Arcus
The goddess of rainbows and a messenger goddess. She used to run the Iris Messaging service, but has turned over most of it to her assistant Fleecy to focus on running her store and developing an identity of her own.

* AscendedExtra: Doesn't make an actual appearance in the [[Literature/PercyJacksonAndTheOlympians first series]], but gets a supporting role in ''Son of Neptune''.
* DidYouJustFlipOffCthulhu: Enemy forces are surrounding her store, the giant Polybotes leading them. She throws a ding-dong at him.
* EverythingsBetterWithRainbows: As the goddess of rainbows she's cheery and perky.
* NiceGirl: Unlike virtually every other god or goddess she lacks the arrogance, personality quirks or JerkAss qualities that make dealing with the other ones such a pain. She is helpful without having to dance through flaming hoops.
* GranolaGirl: She is trying to find her own identity and currently working with an environmentalist-hippie outlook which is what her store represents.

!!Nemesis

Goddess of Revenge.

* DeathByIrony: A fan of inflicting it. Ask Narcissus...as soon as he stops looking into his mirror.
* EmpathicShapeshifter: She takes the form of those others want revenge on. Leo sees his Aunt that called him a Devil Child for causing her sister's death. Hazel sees her as a long dead SternTeacher.
* EquivalentExchange: In the original series, she took one of her children's eyes to influence Camp Half-Blood's victory. In ''Mark of Athena'', she offers the same for Leo, a heavy price for her help should he need it. [[spoiler: Leo uses her offer to save Hazel and Frank's lives... which comes at the cost of trapping Percy and Annabeth in Tartarus.]]
* SplitPersonality: [[AvertedTrope Averted]]. Revenge is universal, and her name remains the same whether Greek or Roman, rendering her immune to the debilitating effects of the war.

!!Heracles/Hercules

Child of Zeus who ascended to Godhood as a minor god who guards the doors of Olympus. Previous owner of Percy's CoolSword.

* BerserkButton: The very mention of Hera will piss him off. [[spoiler: He was nice and friendly to his half-brother Jason, hating to give hard quests since he was once a demigod...right up until he mentioned Hera's name. Then he gave them a really hard one and threatened to kill everyone on the Argo II.]]
* CoolSword: He owned Riptide before Percy.
* JerkWithAHeartOfGold: Hercules is usually more benevolent towards demigods than most other gods since he knows first hand what a pain it is to constantly go on quests, slay monsters, and put up with the other Olympians. The jerk part comes out with anything involving Hera since she tormented him all his mortal life and upon death he was sent to an island with nothing to do but reflect on his past...which he can never forget.
* RevengeBeforeReason: He absolutely ''refuses'' to do anything that could possibly benefit Hera in any way. This is pretty justified, considering all the hell she put him through in his lifetime.
* SuperStrength: His most famous trait.
* WalkingShirtlessScene: Played for laughs; in the past he was apparently naked so much that the dwarves who stole from him called him "Black Bottom."
* WhoWantsToLiveForever: [[spoiler: His immortality means he will never forget the deaths of his first family during his labors and his second one.]]

!!Achelous
Once god of the biggest river in Greece; currently stuck on Hercules' island as a punishment (whether it's for him or Hercules isn't clear).

* AbhorrentAdmirer: Seems to have been one for Deianara. It's never occurred to him that she didn't want to marry a bull with a human head who lives in a river.
* AntiVillain: Tries to drown Jason and Piper, but is really kind of pitiable and, to be fair, they were trying to take his other horn.
* ButtMonkey: Lost his wife to Hercules (see AbhorrentAdmirer), lost his horn (forever keeping his head off balance) and is now trapped on an island with Hercules, who hates him.
* MakingASplash: You come to expect this from a river god.
* MatterReplicator: His horns become cornucopias after being severed, at which point they shoot out food.
* MixAndMatchCritters: Human head, body of a bull.

!!Hecate/Trivia
Goddess of magic and crossroads.

* AscendedExtra: Only gets a few mentions in [[Literature/PercyJacksonAndTheOlympians the previous series]], but plays an important role in ''Son of Magic'' and ''The House of Hades''.
* AtTheCrossroads: Hecate is the goddess of crossroads, and as such can predict possible outcomes each choice will lead into. [[spoiler:In ''The House of Hades'', she shows Hazel three possible outcomes their crew could end up with given their precarious situation, and none of them are pretty.]]
* CanineCompanion: Apparently, she turned Hecuba, the former Queen of Troy, into a Labrador.
* HeelFaceRevolvingDoor: Born a Titan and served the Olympians in the first war, but is remembered for her stint on the Titan's side in the previous series (although this was pretty justified given how the gods treated her). She's now back on the gods' side, although to what extent is ambiguous.
* JediMindTrick: Notable for being the best Mist manipulator the series has seen so far, due to it being part of her powers.
* LadyOfBlackMagic: UrExample.
* LooksLikeCesare: Beautiful, but deathly pale. Hazel compares her to a dead body.
* NeutralFemale: In ''Son of Magic'' (a short story in the Demigod Diaries), she stays out of Alabaster's fight against Lamia, and only intervenes [[spoiler:when he's about to trap Lamia in her own sand]]. [[JustifiedTrope Justified]]; she's a god and both Alabaster and Lamia are her children, so she can't play favorites.
* UhOhEyes: Hazel describes them as [[BlackEyesOfEvil black]] and creepy; although Hecate asserts that she isn't ''evil'', magic, her domain, is merely a tool.
* YouRemindMeOfX: Tells Hazel that she's a lot like her mother.

!!Akhlys
Goddess of Misery. A resident of Tartarus.

* TheEeyore: As the goddess of misery she's always miserable and self-pitying.
* MasterPoisoner: She's also the goddess of poisons, and fittingly has an extensive knowledge of poisonous plants.
* NightmareFace: Her face is described as horrifying and ugly.
* RequiredSecondaryPowers: Apparently she ''doesn't'' have this. When she creates rivers of poison and Percy takes control, they affect her just as much as they did him.

!!Eros/Cupid

Son of Aphrodite and god of love.

* AdaptationalBadass: This version of Cupid isn't the cherubic winged baby that is normally portrayed. This guy gives Nico and Jason a run for their money [[spoiler: and manages to drag out a Nico's suppressed feelings about Percy.]]
* CombatPragmatist: Fights Jason and Nico while invisible. As he himself has said, love isn't fair and doesn't fight fair either.
* HappilyMarried: To Psyche, as per mythos.
* LoveFreak: Though in a different sense than Aphrodite. Cupid embodies the less romanticized and deeper meaning of love: [[DidNotGetTheGirl The willingness to give up and sacrifice that]] and [[IWantMyBelovedToBeHappy for that which you love]], and the fact that [[LoveHurts it's just as capable of making you sad as it can happy]].
* LoveGod: Though this Cupid [[AdaptationalBadass isn't some love-struck pansy...]]
* LoveHurts: As the personification of love, he seems to take a dry delight in this trope. That said, he seems to have sympathy for those who are willing to face that it hurts [[spoiler:like Nico finally coming clean with his repressed feelings for Percy]].
-->'''Jason''': Is this guy Love or Death?
-->'''Cupid''': Ask your friends. Frank, Hazel, and Percy met my counterpart, Thanatos. We are not so different. Except Death is sometimes kinder.
* ManInWhite: He wears a white suit which only contributes to his harsh beauty.
* PrettyBoy: Jason notes that Eros is beautiful and harsh, like it's difficult to look directly at him.
* RedEyesTakeWarning: His eyes are blood-red, as if every Valentine was melted down.
* SmallRoleBigImpact: He only shows up in one chapter, but what he does ''in'' that chapter ([[spoiler:forcing Nico to confess he had a crush on Percy in order to defeat him]]) affects Nico's personality and his interactions with Jason throughout the rest of the book.
* TrueNeutral: In-universe, self-proclaimed example.
--> '''Cupid''': Love is on every side. And no one's side. Don't ask what love can do for you.
* WingedHumanoid: His preferred form has a pair of wings.

!!Nyx/Nox

Goddess of Night.

%%* AttackOfTheFiftyFootWhatever
* AttentionWhore: How [[spoiler:Percy and Annabeth manage to [[TalkingTheMonsterToDeath talk her down]]: they pretend to be tourists and that when they booked the "Tartarus excursion" Nyx was hardly mentioned.]] She doesn't take this very well.
* CastingAShadow: Part of her power set as the goddess of night is the ability to move in and out of shadows.
* LadyOfBlackMagic: UrExample.
* TheUnfought: Thanks to Annabeth and Percy managing to [[spoiler:distract her children and cause them to bicker long enough for them to hightail it out of there.]]
* WhipItGood: Uses a whip made out of stars.

!!Tiberinus and Rhea Silvia

Rhea Silvia is the mother of the legendary twins, Romulus and Remus. Her sons were set adrift on the Tiber river. Its god, Tiberinus, saved the twins, who would go on to found Rome, and ended up with her.

* CelebrityResemblance: They look and act a lot like Gregory Peck and Audrey Hepburn off the set of ''Film/RomanHoliday''.
* SickeninglySweethearts: They act giddy and in-love.
%%ThinkNothingOfIt

!!Triptolemus

A man who found favor with Demeter and was raised to a minor farming god.

* CloudCuckooLander: Turned Nico into a cornstalk, for one.
%%{{Jerkass}}: A minor one.
* SeriousBusiness: Woe betide anyone who doesn't consider agriculture as important as he does.

!!Kymopoleia
Goddess of sea storms. A daughter of Poseidon, and Percy's half-sister. Currently working for Gaea to get revenge on her parents and the mortals who have long since forgotten her. She has no Roman identity.

----
* AttentionWhore: Joined Gaea to make the world remember her again.
* CainAndAbel: [[RunningGag She joins the list of Percy's siblings who have tried to kill him.]]
* DudeWheresMyRespect: Despite being an incredibly powerful goddess, she despairs over not getting the recognition she deserves.
* HeelFaceTurn: Jason wins her over by promising to erect shrines to her and the other minor gods at the Greek and Roman camps.
* InUniverseNickname: Jason and Percy just call her "Kym."
* TheMentor: She's the one who reveals to Jason and Percy how to defeat Gaea [[spoiler:by reminding them of how Ouranos, a fellow primordial god and First Lord of the Sky, was ultimately defeated]]. She also warns Percy of his FatalFlaw once again.
* UnderwaterRuins: She makes her lair in the abandoned wreckage of her father's old palace.
* TheUnfavorite: Her parents keep her away because they find her presence and powers disruptive.
* UnwantedSpouse: She was married off to Briares, whom she loathes.

!!Asclepius
God of healers. Son of Apollo. Currently under lock and key beneath his temple, by order of Zeus himself.

----
* BackFromTheDead: His specialty, and the reason he's locked away under his temple.
* DressedToHeal: Your standard white coat and stethoscope.
%%* LabcoatOfScienceAndMedicine
* SealedGoodInACan: He's entirely benevolent, but his ability to raise the dead enraged Hades enough that Zeus killed him. He was brought back as a god of medicine to appease Apollo, on the condition that he not perform any resurrections, and he's guarded by a KillerRobot modeled after his daughter Hygeia.
* SuperDoc: Comes with the territory of being the god of healers.
* TryToFitThatOnABusinessCard: If it's a medical skill that can be expressed as a string of letters, he's got it after his name. Leo loses count after twenty such acronyms.

!!Nike/Victoria
Goddess of victory and charioteer to Zeus.

* BoundAndGagged: After being successfully subdued by the Seven she's tied up and kept in the ''Argo II''. The fact that her "gag" is a dirty sock and duct tape is given much emphasis.
* CompetitionFreak: Obsessed with victory in all its forms, which makes her case of the divine schizophrenia much harder to handle as she's so desperate to pick a winner between her two sides that she's much more volatile as a result. According to Percy and Annabeth this is a trait she shares with her children.
* RockMonster: Her minions, the Nikai (or "Nikettes" as Leo christens them), are metal women.
* WingedHumanoid: Her preferred form has two large golden wings.
[[/folder]]

!!Gaea's Forces

[[folder:Gaea]]

The goddess of the Earth and progenitor of the Titans and, by extension, the Olympians. BigBad of the series.

* AffablyEvil: She maintains a calm and polite air at all times, even when taunting heroes and all but outright saying she wants them dead.
* BigBad: Of the series.
* TheChessmaster: Seems to have planned out or predicted an awful lot of characters' choices prior to the beginning of the story.
* DishingOutDirt: She is the Earth. Like in the original mythology, she does not have nature-based powers (this was the domain of Pan).
* TheDreaded: Everybody's scared of her. She is, after all, ''the earth''.
* EldritchAbomination: Seeing as her body is ''the entire planet''.
* TheEndOfTheWorldAsWeKnowIt: The entire plot is about preventing Gaea from waking up, since this trope is what's going to happen if she does. And she can't be defeated, because her body is the planet Earth itself.
* EvilMatriarch: The mother of all the gods and monsters except for the [[EldritchAbomination most primordial]] of them.
* {{Foil}}:
** To Juno. Both are matriarchs who are generally disliked, but Juno wants to save the world while Gaea wants to destroy it.
** To Kronos, the previous BigBad -- she takes a more direct approach to manipulating the main players of the prophecy.
* GaiasVengeance: Although she's not directly taking it out on mortals, just the mythological creatures.
* LogicalWeakness: Because she ''is'' the all-powerful Earth Mother, [[spoiler: she's near-powerless when in the air]].
* TheManBehindTheMan: In the first book, behind her son Porphyrion.
* ManipulativeBastard: Definitely more keen on this tactic then Kronos was. Following the theme of family ties, she emotionally manipulates near everyone using loved ones (Piper, Percy, Leo, Hazel, even some gods). Frank is supposedly an exception, thanks to his convoluted legacy.
* NonActionBigBad: Because she's asleep, she pulls strings to get what she wants rather than directly doing things herself.
* ParentalFavoritism: Very blatantly favored the giants over the Titans.
* SignificantBirthdate: Invoked. She chooses August 1, the Feast of the Goddess of Hope, to begin the second Gigantomachy.

[[/folder]]

[[folder:Tartarus]]

''The'' Tartarus, a manifestation of the darkest part of the Underworld.

* ArchnemesisDad: To Damasen.
* BigBadDuumvirate: Implied by his dialogue, and a logical conclusion given that he fathered the Giants with Gaea and is by far the most powerful of her affiliates.
* BodyHorror: [[EldritchLocation The entirety of Tartarus is his]] ''[[EldritchLocation body]]''. This is given nods throughout the book as Percy and Annabeth joke about how they're traversing across different parts of his anatomy.
* DarkIsEvil: Oh, you had better believe it!
* DisproportionateRetribution: Destroys [[spoiler:Krios and Hyperion]] for the former describing him in an unflattering manner.
* TheDreaded: For very good reason. It takes [[spoiler:a YouShallNotPass by Bob and Damasen to slow him down long enough for Percy and Annabeth to escape. What, exactly, do you think happened to them afterwards?]]
* EldritchAbomination: The realm of Tartarus is his body, and when he [[HumanoidAbomination assumes a form to deal with them personally]] Percy and Annabeth have a hard time looking directly at him.
* FightingAShadow: The manifestation at the end of the book is simply a form he assumed to deal with the Heroes. His true form ''is'' the locale of Tartarus.
* GeniusLoci: Tartarus' body is pretty much the Greek version of Hell.
* KickTheDog: We probably weren't supposed to feel bad for [[spoiler:Hyperion and Krios]], but his reason for doing what he did to them just makes it callous.
* KnightOfCerebus: Twofold. [[spoiler:Percy and Annabeth]]'s trek across Tartarus (technically his body) is easily one of the darkest parts of the book, and things naturally get worse when he shows up in person.
* MightyGlacier: Is slow but immensely powerful, due to never having taken on a humanoid form before.
* OffingTheOffspring: Presumably did this to [[spoiler: Damasen and Bob.]]
* RealityEnsues: He assumes an incredibly powerful humanoid form to crush Percy and Annabeth...and is barely able to walk, since he's a GeniusLoci and has never done it before.
* UnskilledButStrong: Thankfully, for all his power, he's clearly unused to combat in a corporeal form, a weakness the heroes are able to exploit. Justified, though, as he'd never summoned a physical manifestation of himself before this point, and was essentially taking his baby steps.
* WombLevel: The realm of Tartatus is his body.
[[/folder]]

[[folder: Giants]]

!!General

* ArchEnemy: Each one was designed to destroy a specific god.
* BackForTheFinale: Come back regenerated and just as ready to destroy the demigods as ever in ''The Blood of Olympus.'' [[spoiler: Of course, now that Reyna and Nico manage to unite the warring camps and cure the gods' schizophrenia, they are disposed of fairly easily.]]
* EvilerThanThou: The gods and Titans are not saints and it is sometimes hard to see a difference between them. However, everyone agrees the giants are worse than both. Being children of the Greek version of {{Hell}} it is to be expected.
* EvilKnockoff: Of the Olympians
* FinalBoss: In the first three books, quests to defeat the giants drive much of the plot -- Porphyrion for the first, Alyconeus for the second, and Enceladus for the third. While not an official quest, Hazel's battle with Clytius fulfills this role for the fourth. And, of course, the fifth book deals with ''all of them.''
* GaiasVengeance: They are it.
* ImplacableMan: Their primary strength. They lack the vast magic possessed by the gods, but are designed to keep coming no matter what thanks to only being able to be killed by a god and demigod working together.
* OurGiantsAreBigger: The average giant or giant-sized monsters are around 10-12 feet tall. These giants are around 20 feet or more.
* {{Pride}}: A flaw shared by all of them and according to Nemesis they have more pride than the Olympians or Titans which is saying something. Each one thinks they are invincible in battle and can surely defeat the Olympians despite having lost before and individual giants being defeated by individual demigods. This causes them to severely underestimate their enemies leading to one humiliating defeat after another.

!!Porphyrion
The most powerful of the giants and their king. Deigned to be a direct counter to Zeus including power.
* ArchEnemy: To Zeus.
* AuthorityEqualsAsskicking: When at full strength.
* BladeOnAStick: His main weapon
* CurbStompBattle: In the last book, [[spoiler: He is on the receiving end of one at the hands of Zeus and Jason. Zeus nearly kills him with his Master bolt before Jason blows him off a cliff and Zeus uses another lighting blast to reduce him from ash. His own spear is sliced in half and he fails to mount any sort of defense or offense.]]
* TheDragon: To Gaea.
* HairDecorations: Like most Giants. His "decorations" of choice are weapons (implied to be those of past enemies).
* LargeAndInCharge: Described as the tallest of the giants and the most built physically.
* OrcusOnHisThrone: Is resurrected in the first book only to do nothing over the next four while the heroes steadily advance toward him. Any actual planning or action is taken by Gaea.

!!Alcyoneus
Counterpart to Pluto and the eldest of the Giants.

* ArchEnemy: To Hades. Also to Hazel, seeing as she was the one who resurrected him.
* TheDragon: To Gaea, spanning the time period from the forties to Porphyrion's rise.
* TheHeavy: Of ''The Son of Neptune''.
* MadeOfIndestructium: Except if he's out of his homeland Alaska.
* TooDumbToLive: As pointed out by Frank -- when you're unkillable as long as you stay in the boundaries of the state of Alaska, you really shouldn't hang out in the part of the state that's only 10 miles wide.
--> '''Frank:''' "Welcome to Canada, idiot."

!!Enceladus
Counterpart to Athena.

* ArchEnemy: To Athena.
* BreathWeapon: Possesses fiery breath.
%%DisneyVillainDeath
* EvilGenius: The most intelligent of the giants and the tactician among them, but given how stupid some of his fellow giants are this isn't saying much.
* FlunkyBoss: He's aided in his fight against Jason, Piper, and Leo by several Earthborn.
* HairDecorations: He has bones braided into his hair.
* IHaveYourWife: Takes Tristan [=McLean=] hostage to force Piper's allegiance.


!!Polybotes
Counterpart to Poseidon.

* ArchEnemy: To Poseidon.
* TheBrute: Powerful for sure, but clearly not the most cunning of the giants.
* CurbStompBattle: In the last book, [[spoiler: Both gives and receives one. He fights Percy in the water and his poison instantly takes Percy out, but is on the receiving end of one from Jason and Kymopoleia. And he only won the Percy battle because Percy intentionally swam into the poison because he felt he deserved to be punished for prior actions.]]
* HairDecorations: He has ''live basilisks'' slithering in his hair.
* InformedAbility: Supposed to be the anti-Poseidon, and his mere presence left Percy in a shivering pile the first time he saw the giant. Percy proceeded to open up a can of [[CurbStompBattle whoopass]] on him when they encountered one another during the last battle, and Polybotes became the first giant to lose against a demigod in single combat (okay ''technically'' a god was there). Some anti-Poseidon.
* PaperTiger: All of the giants vastly over-exaggerate themselves one way or the other, but Polybotes is the worst. Despite his frighting appearance and and status as the anti-Poseidon he is stymied by minor goddesses defeated relatively easily in single-combat with demigods. Especially hilarious in the second time it was underwater, which should have been his domain, against a child of the sky.
* PoisonousPerson: His very touch turns water to poison.
* ProngsOfPoseidon: Simultaneously of the sea, gladiator, and evil varieties.


!!Clytius
Counterpart to Hecate. Incinerated by Hecate. With the liberation of the Doors of Death from Gaea's control, he is currently the only destroyed member of the Giants.

* AntiMagic: His Shroud of Darkness neutralizes the mist.
* ArchEnemy: To Hecate.
* BlackCloak: One made out of smoke because, you know, EvilWearsBlack.
* EnergyAbsorption: Since his ArchEnemy is the goddess of magic, Clytius was designed to absorb all her magic attacks.
* EvilSoundsDeep: Described as sounding like a bass guitar.
* HairDecorations: An [[AvertedTrope aversion]] among giants; he has no special decorations. The only unusual thing is that the braids appear to be made of smoke.
* KillItWithFire: The one way to defeat him is with magical fire.
* PeoplePuppets: [[spoiler: Controls Annabeth, Percy and Leo (and even corpses in the tombs of the Necromanteion) and uses their mouths to speak for him.]]
* SuperSmoke: Controls smoke that absorbs all Mist and magic. [[spoiler: It also is used to steal people's voices and drain their life force.]]
* TheQuietOne: Out of all the Giants, Clytius rarely speaks.
* VoiceForTheVoiceless: [[spoiler: Doesn't use his own mouth, rather he steals people's vocal cords and communicates using their mouths.]]


!!Otis & Ephialtes
Counterparts to Dionysus.

* BerserkButton: Exploited by Percy during his fight with Otis. Insulting ballet enrages him so that he makes stupid mistakes.
* ButtMonkey: Poor Otis owns this trope.
* TheDarkChick: The smallest and least threatening of the Giants seen thus far.
* FanDisservice: Otis' form-fitting tutu.
* HairDecorations: Gold and silver coins, and, at one point, [[TemptingFate fireworks]].
* IdenticalTwinIDTag: Ephialtes has purple hair; Otis's is green.
* {{Jerkass}}: Ephialtes.
* RealMenWearPink: Otis is fond of ballet and wears a tutu during the fight with Percy and Jason. Everybody else, Ephialtes included, finds this revolting.
* SensitiveGuyAndManlyMan: With Otis as the sensitive one and Ephialtes as the Manly Man.
* ThoseTwoBadGuys: Always seen together and are characterized by their interactions with one another.

!!Orion
Counterpart to Artemis and Apollo. In the original mythology, Orion, while sometimes depicted as a giant, did not participate in the Gigantomachy.

* EgomaniacHunter: A curse by Apollo turned him into one in ancient times and upon his return from Tartarus he has become one to women.
* FaceHeelTurn: Originally sided with the gods against the giants and fell in love with his target.
* HeManWomanHater: Originally loved Artemis, but being rejected by her, cursed by Apollo, and sent down to Tartarus caused him to make an about face and hunt any "strong" women with a focus on Artemis' Hunters and the Amazons.
* HuntingTheMostDangerousGame: Strong women, specifically.
* StrawMisogynist: Is he ever. He despises strong women, and wooed Artemis partly so he could "tame" her.
* TraumaCongaLine: What caused him to join his fellow giants despite originally siding with the gods. First he was blinded for flirting (well, that's all ''he'' claims it was) with a mortal princess, given new eyes, joined the Hunters of Artemis (the only male) only to fall in love with Artemis and be rejected, cursed by Apollo who feared Artemis might grow weak in her vows of maidenhood, cursed to hunt down every beast of the earth till [[MotherNature his own mother, Gaea]] had to send a giant scorpion to kill him, and finally sent down to Tartarus.
* YouCantFightFate: Tried to fight his destiny and fell in love with the goddess he was supposed to destroy. Being rejected, cursed, and finally cast down into Tartarus for his troubles caused him to accept his fate and fight the gods.

!!Mimas
Giant counterpart to Hephaestus. Resides in the Temple of Fear.

* DropTheHammer: Carries a giant sledgehammer.
* WalkingTechbane: Specifically invoked, as he was made to counter the god of technology. Around him, "maps are misread, devices break, data is lost, and the finest minds turn to mush" (which is why Annabeth has such a hard time with him).

!!Periboia
Porphyrion's daughter and princess of the Giants. Counterpart to Aphrodite.

* TheSmurfettePrinciple: The only female Giant we see, and also the only one not explicitly a child of Gaea.

[[/folder]]

[[folder:Titans]]

!!Hyperion
Titan of Light and Lord of the East. Recurring character from ''Literature/PercyJacksonAndTheOlympians''.

* AndIMustScream: [[spoiler:Gets his essence sucked into Tartarus' maw along with Krios when the the latter speaks ill of him.]]
* AssholeVictim: [[spoiler:Sure his fate was horrific, but he spent most of his screen-time before that point mocking Bob, leaving the audience little sympathy]].
* DemotedToExtra: Not that he had much of a role in the original series, but there he was TheDragon who fought alongside Kronos and dueled Percy while killing all manner of demigods, nature spirits, and Hunters. Here, [[spoiler:he doesn't even get to fight before Tartarus offs him]].
%%* FourTemperamentEnsemble: Choleric.
* {{Jerkass}}: Mocked Bob at multiple points about his amnesia and generally acted like a spoiled brat.
* HowTheMightyHaveFallen: To think he was TheDragon to Kronos in the previous series.
* LightIsNotGood: The Titan of the East, which can be interpreted as The Titan of ''[[LightEmUp Sunrise]]''.
%%* RedOniBlueOni: The Red to his brother, {{Foil}}, and sometime partner Krios.

!!Krios
Titan of the South and Lord of the Stars and Constellations. Defeated by Jason during the Roman attack on Mount Othrys, he currently resides in Tartarus, safeguarding [[spoiler:The Doors of Death]] with Hyperion.

* AndIMustScream: [[spoiler:For his careless (though accurate) description of Tartarus, the Dark God shreds him and Hyperion with an energy blast and consumes their essence.]]
* AssholeVictim: Not as badly one as Hyperion, [[spoiler:but he did talk about wanting to kill Jason before getting blasted by Tartarus]].
* {{BFS}}: Just like his brother Koios.
* ButtMonkey: Seriously, [[spoiler:he got [[AndIMustScream vaporized by Tartarus just for making one little insult about him]]]]. He also gets the least amount of respect of all the Titans.
* DarkIsEvil: Wears dark armor and ButtMonkey he may be, but he's still a Titan, and he expressed interest in getting to [[spoiler:fight Jason for killing him back during the battle of Mount Orthys]].
* TheEeyore: He's got some serious self-esteem issues compared to his brothers
%%* FourTemperamentEnsemble: Melancholic.
* GreenEyedMonster: Shown to be quite jealous of the more proactive Titans, Hyperion in particular.
* IneffectualSympatheticVillain: Considering his words and actions in the previous series along with his dialogue here, you can't help but feel at least a little bad for him [[spoiler:when Tartarus blows him up]].
* {{Jerkass}}: Less so than Hyperion, but he didn't exactly shower Bob with hugs when he showed up.
* TooDumbToLive: [[spoiler:Insulting Tartarus was a bad, bad idea.]]
%%* RedOniBlueOni: The Blue to Hyperion's Red.

!!Koios
Titan of Foresight and Lord of the North. Also the grandfather of Artemis and Apollo.

* AffablyEvil: Of all of Bob's (Iapetus's) brothers, he's the only who greets him with a smile and genuinely ''acts'' brotherly, even expressing interest on getting revenge on Hades for reducing Bob to a mere janitor.
* {{BFS}}: His sword is the size of a surfboard.
* BoisterousBruiser: He's as big and bulky as most Titans, and he's quite the affable guy...at least to his family. [[spoiler:Percy notes that he has Apollo's (his grandson's) smile]].
* EvenEvilHasLovedOnes: He's the only one of Iapetus's (Bob's) family to seemingly care about him post-amnesia. Also, it's offhandedly mentioned, but he did express desire at having his daughter [[spoiler:Leto, the mother of Artemis and Apollo]], join them to take revenge on Zeus, apparently due to how Zeus treated her after they were born.
* FourTemperamentEnsemble: Sanguine.
%%GeniusBruiser
* AnIcePerson: As the Titan Lord of the North, he held the same position Boreas now does and thus is implied to hold similar powers.
* IcyBlueEyes: Described as being as blue-white as a glacier and just as cold. [[spoiler:Percy also admits they're a lot like his granddaughter Artemis's eyes]].
* SoleSurvivor: [[spoiler:Of the four Titans (including Bob) that were seen in Tartarus, he's the only one whose death wasn't confirmed]].
* TheStarscream: [[spoiler:He suggests that while it might be the giants who destroy Olympus this time, when Gaia awakes it will her ''favored'' children (the Titans) who will rule]] It's unknown exactly how much truth is in this statement though.
* WhatHappenedToTheMouse: It's unknown exactly what happened to him [[spoiler:after the Doors of Death were sealed]]. As he wasn't there when [[spoiler:Tartarus manifested and thus avoided Hyperion and Krio's [[AndIMustScream fate]], nor was he anywhere in sight during Bob and Damasen's HeroicSacrifice]], it can at least be assumed he survived [[spoiler:likely with his daughter Leto. Whether he escaped Tartarus is another matter though...]]

[[/folder]]

[[folder:Other Servants]]

!!Medea
Princess of Colchis, department store manager.

* CharmPerson: She has the power of charmspeaking.
%%LoveMartyr
%%StrawFeminist
* WomanScorned: So crazy she tries to kill Jason for having ''the name'' [[Theatre/{{Medea}} Jason]].
* {{Yandere}}: UrExample.

!!Midas
The legendary king with the golden touch. Didn't learn his lesson after all.

* AffablyEvil: Midas acts friendly to his guests while trying to turn them into gold.
* ArsonMurderAndJaywalking: Midas forces demigods that find him to choose between being turned to gold or being murdered by his son, he works for Gaea, and runs a gold selling scam.
%%MadHatter: Midas.
* TakenForGranite: Midas's power to turn people into gold.

!!Lit

Midas's son.

* BloodKnight: Enjoys swordfighting.
* GoodScarsEvilScars: Covered in scars from his swordfights.
%%HotBlooded: Lit.
* InSeriesNickname: His name is short for "Lityerses."

!!Phineas
A blind man with the gift of prophecy brought back to life by Gaea. He gets killed by poison in a bet between him and Percy when Gaea decides to spare Percy rather than him.

* AnimalNemesis: He ''hates'' harpies.
%%BestServedCold
%%BlindSeer
* YouHaveOutlivedYourUsefulness: He still had some, just not as much as Percy.

!!Eidolons
Malevolent spirits with the ability to possess mortals, demigods, monsters, and machines.

* AndIMustScream: The three we see in ''The Mark of Athena'' [[spoiler: end up forever fused to the remains of several completely trashed Automatons. Yeah, payback's a...]]
* DemonicPossession: ''Duh.''
%%{{Jerkass}}
* SupernaturalGoldEyes: The telltale sign of eidolon possession.

!! Chrysaor
The Golden Warrior. Son of Posiden and Medusa, brother of Pegasus and half-brother of Percy.
* AttentionWhore: He became a pirate for the attention since his brother got all the attention.
* {{Irony}}: He wants a bigger legend but the lack of information about him is what makes him so dangerous.
* ScrewThisImOuttaHere: His crew when Percy bluffed Mr. D was coming.
* WakeUpCallBoss: He is the only character in the series that can defeat Percy when he's at the top of his game in a straight fight.

!!Arachne

-->''“I excel at pulling strings! I’m a spider!”''

Athena's most famous rival and the mother of all spiders. Guards the Athena Parthenos against all of her children who try to claim it.

* AllWebbedUp: As a giant spider, this is part of her powers.
* ArchEnemy: She ''hates'' Athena.
* BackForTheDead: [[spoiler: She shows up in person for literally about half a second in ''The House of Hades'', trying to kill Annabeth, only to get killed by Percy.]]
* BodyHorror: Her entire lower half is that of a black widow spider. [[ArchEnemy She's very bitter about that]].
* EnigmaticMinion: Shown to be complicit with Ephialtes and Otis, but the extent of her servitude to Gaea is never really explored. At any rate, she seems much more caught up in her own agenda.
* FatalFlaw: Like Annabeth, hers is {{Pride}}.
%%FauxAffablyEvil
* FinalBoss: Of ''The Mark of Athena''.
* {{Pride}}: Her defining character trait.

!!Pasiphaë
Wife of Minos and mother of the Minotaur.

* BrokenBird: Punished for her husband's crimes, and is bitter that Minos [[KarmaHoudini gets to be a judge of the Underworld]] despite how horrible of a human being he was.
* DisneyVillainDeath: [[spoiler:AndIMustScream If not something worse.]]
* InterspeciesRomance: She was cursed to fall in love with her husband's prize bull.
%%LadyOfBlackMagic
* NiceJobFixingItVillain: [[spoiler:Resurrecting the Labyrinth.]]
* SmallRoleBigImpact: Resurrects [[spoiler:Daedalus's Labyrinth]] in her twenty-odd page appearance, inadverently providing the heroes with a way to [[spoiler:get the Arthena Parthenos back to Camp Half-Blood.]]

!!Sciron
Son of Poseidon and bandit extraordinaire.

%%FauxAffablyEvil
* FearsomeFoot: Tells Hazel and Jason that they have to clean his feet to let him go. Neither of them are happy about it, because his feet are absolutely ''disgusting'', but also because as soon as you bend down, he kicks you right off the cliff.
%%HoistByHisOwnPetard
* ImprobableAimingSkills: UpToEleven. He takes pride in this.
%%{{Jerkass}}

!!Michael Varus
Son of Janos and a former praetor of New Rome who infamously lost the legion's standard in Alaska.

* AmbitionIsEvil: Described as being ambitious and prideful. He led the legion to Rome in a quest for glory, which resulted in a massacre.
* MeaningfulName: "Varus" means "crooked" in Latin, although the name most likely is a reference to the historic Publius Quinctilius Varus, who is most well known for losing three legions when ambushed.
* OurGhostsAreDifferent: Can apparently hold their own in combat.

!!Lycaon

The first werewolf.

* BackForTheFinale: Reappears in the last book as a servant of Orion, out to get Reyna and Nico.
* OurWerewolvesAreDifferent: Can turn into a full wolf, among other things, and shares the infamous weakness to silver -- he is hurt by the silver arrows of the Hunters. Argentum (who is made of silver) can harm his wolves, but Aurum (gold) cannot.
* WolfMan: The very first.
[[/folder]]

!!Others
Characters not directly affiliated with any of the other groups, but still play roles in the story.

[[folder:Other Mythological Creatures]]
!!The Hunters of Artemis
Mortals, demigods, nymphs, or other young women sworn to Artemis. They join the goddess on her hunts and are blessed with agelessness and divine hunting prowess so long as they remain perpetual maidens. They are currently led by Thalia Grace.

* TheAgeless: They appear as young as they did when they took the oath.
* AmazonBrigade: All-female and all-badass. ''The Blood of Olympus'' sees a team-up between them and the ''other'' AmazonBrigade of the series, the Amazons.
* DoesNotLikeMen: Forsworn to forsake men forever. Most of them actively avoid interaction for fear of losing their divine sponsorship.
* GreatWhiteHunter: Blessed with divine ranged capabilities and ImprobableAimingSkills.
* MauveShirt: [[spoiler: Phoebe, supporting Hunter since the first series and mentioned as the best tracker and healer (likely due to her age), is unceremoniously offed by Orion's attack in ''The Blood of Olympus.'']]
* PowerGlows: Said to have a silver aura.
* ReallySevenHundredYearsOld: The more senior members have been around for years and years and don't look out of their teens. Phoebe in particular is mentioned to have been there during the first fiasco with Orion, three or four thousand years ago.
* TheStraightAndArrowPath: Use traditional hunting gear (eg. bows and arrows) in a story set in the 2010s.

!!The Amazons
A tribe of female warriors who worship war gods (like Ares, Athena, or Bellona). Unlike the Hunters of Artemis, they are allowed to have relationships and children with men -- as long as those men are fine with being treated like second-class citizens. They are lead by Hylla.

* AmazonBrigade: TropeNamer.
* BackForTheDead: The Amazons return in ''The Blood of Olympus'' [[spoiler: and are near-massacred by Orion.]]
* CavalryBetrayal: In ''The Son of Neptune'' they arrive rather late to the Gaea's forces vs. Camp Jupiter battle... [[spoiler: and turn out to be helping the demigods instead]].
* ChallengingTheChief: Any Amazon can obtain leadership by challenging and killing the Queen.
* DoesNotLikeMen: Subverted. The Amazons like men perfectly fine -- [[DoubleStandardAbuseFemaleOnMale they just like men knowing their place even more]].
* {{Hypocrite}}: They boast that the world would be a more peaceful place with women in charge despite being a ProudWarriorRace.
* LadyLand: Amazon HQ. The Amazons' boyfriends are basically servants.
* MauveShirt: [[spoiler: Kinzie, friend to Hylla and supporting Amazon in ''The Son of Neptune'', is killed by Orion in ''The Blood of Olympus.'']]
* ProductPlacement: The Amazons own Amazon.com, and some read on their Kindles when they ought to be on guard duty.
* StrawFeminist: They keep their boyfriends in orange jumpsuits and collars.

!!Echo
A nymph who fell in love with Narcissus, and is doomed to always echo what she previously hears.

* HopelessSuitor: For Narcissus. She loves him, but he only loves himself.
* IronicEcho: Literally. [[spoiler: She's been cursed by Hera for gossiping a lot to echo whatever she hears last.]]
* LoveMartyr: [[spoiler: She's spending her second chance at life still trying to help [[ItsAllAboutMe Narcissus]] break from his curse. He pays no attention to her, and because of her curse she's almost invisible to everyone else.]]
* LoveRedeems: [[spoiler: She's trying to do this for Narcissus]].
* VisibleInvisibility: Part of her punishment at the hands of the gods, she always mirrors any background she walks in front of, causing her to appear camouflaged and invisible. [[spoiler: She shows her true face to Leo for a moment, and Leo remarks that she was actually kind of pretty, although the memory of her face was already slipping away.]]
* WhatBeautifulEyes: [[spoiler: When she kisses Leo, he marvels at her blue eyes.]]

!!Lamia
A peppy old woman who booked Claymore's event in Keeseville, New York. She's mostly an annoyance to Claymore. Only shows up in ''The Demigod Diaries''. [[spoiler:She turns out to be a monster in disguise and the half-sister of Alabaster through Hecate. She's been tracking Alabaster with the intent of murdering him on Gaea's orders, forcing him to move from town to town and constantly keep up magic barriers to hold her off. Thanks to being brought back from Tartarus by Gaea, she can't die, making it difficult for Alabaster to get rid of her for good]].

* AndIMustScream: As of the end of ''Son of Magic'', Alabaster knows a spell that will keep her essence from departing to Tartarus, meaning that if he destroys her she will be stuck as a sentient pile of dust for all eternity. Hecate thinks the threat of this should be enough to keep her at bay.
%%AxCrazy
* BitchInSheepsClothing: Hinted at later on, when after acting like an enthusiastic and sweet, if rather irritating, grandmotherly old lady to Claymore, she calls him to demand he hand over the card about Alabaster's address to her for no discerned reason. [[spoiler:Comes to fruition when she shows her true nature as a monster who works for Gaea]].
* CainAndAbel: [[spoiler:The Cain to Alabaster's Abel]].
%%DarkActionGirl
* DisproportionateRetribution: Yes, Hera killing her children was wrong, but crafting a magic to let monsters find demigods everywhere, and then keeping it running, racking up demigod casualties, for ''three thousand plus years'', is way overreacting.
* EvenEvilHasLovedOnes: [[spoiler:She wants to bring back her children, which Gaea promised to do for her. For her, if killing Alabaster means having them back, then so be it]].
* FreudianExcuse: [[spoiler:In the past, when she was a Libyan queen, she was courted by Zeus and had two children she loved. When Hera found out about her relationship with Zeus, she murdered Lamia's children, and in front of her, no less. Needless to say, Lamia didn't take it well]].
* GenkiGirl: An elderly version, but she's quite enthusiastic and full of praise for Claymore after he's finished with the event. [[spoiler:Subverted, however, when she's revealed to be a monster]].
* GreaterScopeVillain: She's the one who granted monsters the power to detect demigods, meaning that she's probably got more demigod deaths on her hands than any other villain.
* MamaBear: [[spoiler:A twisted variant. She loves her children dearly and will bring them back to life at any cost, even if it means working for Gaea and murdering people]].
* SmallRoleBigImpact: [[spoiler:She only appears in a short story in ''The Demigod Diaries'', but what she did before both ''Literature/PercyJacksonAndTheOlympians'' and ''Literature/TheHeroesOfOlympus'' even started -- namely, giving monsters the power to sense demigods and track them down by their scent -- is a big factor in the story]].
** She probably has more demigod deaths on her hands than any other character in the story.
%%WalkingSpoiler
* WouldHurtAChild: [[spoiler:Really, ''really'' wants to murder Alabaster]].


[[/folder]]

[[folder: Mortals]]

!!Rachel Elizabeth Dare
-->''"We have to work together to defeat Gaea."''

The Oracle of Delphi. Returning character from ''Literature/PercyJacksonAndTheOlympians''.

* BrickJoke: The blue hairbrush she used to thwack Kronos in the face with in the previous series makes a reappearance in ''The House of Hades'' when Rachel and Grover meet with the Romans.
* BroughtDownToNormal: [[spoiler: The power of prophecy still isn't working by the end of ''The Blood of Olympus,'' leaving her without her powers.]]
* FaintingSeer: When the Oracle possesses her.
* {{Foil}}: To Octavian.
* FullNameUltimatum: [[spoiler:In ''The House of Hades'', she addresses Reyna by her full name]].
* DemotedToExtra: Has a far less important role in ''Literature/TheHeroesOfOlympus'' than in the previous series, besides getting some mentions, an appearance in the first book, and an appearance in a dream (alongside Grover) in the fourth.
* OutOfFocus: Doesn't appear in the second and third books, although she returns in the fourth.
%%UnfazedEveryman

!!Beryl Grace
Jason and Thalia's mother, a beautiful Hollywood starlet.

* EightiesHair: Her description in the previous series includes that she had a "poofy hairdo".
* AbusiveParents: Attracting the king of the gods (twice) had a negative effect on her ego, and eventually she turned to alcohol. This led to many arguments with Thalia. She's not above [[spoiler:offering her son as a peace offering for an angry goddess]], either.
* TheAlcoholic: She turned to drink later in life, which caused her rift with her daughter.
* LoveMakesYouCrazy: Her inability to get over Zeus and her own pride [[spoiler: turned her into a ''mania'', a spirit of insanity, who haunts her son in the last book.]]
* MissingMom: To Thalia and Jason.
* NoNameGiven: The only one of the Seven's mortal parents to not be named. She's finally named by the last book.
* PosthumousCharacter: She's dead by the story proper.
* WhiteDwarfStarlet: Described in the previous series to be an "eighties starlet with a poofy hairdo."

!!Tristan [=McLean=]
Piper's father, who works as a movie star.

* FakeNationality: In-universe, he never plays a Native American in any movie he's in, despite being Cherokee.
* HostageSituation: [[spoiler: Gaea kidnaps him so that Piper will do what she wants.]] It doesn't work.
* MindWipe: [[spoiler:Piper gives him a drink that erases his memory of the whole ordeal, even if it helped the two of them grow closer.]]
* ParentalNeglect: While he's presented positively, he tends to leave a bad taste in the mouth once one remembers that Piper rarely gets to spend time with him, and that time is usually ''under a minute''.
* ParentsAsPeople: His difficulties juggling his job and his daughter, as well as his relative weak will compared to other characters, are given extensive focus.
* ParentsInDistress: [[spoiler:He's held hostage in ''The Lost Hero'' to blackmail his daughter]].
* WindowLove: With Piper, [[spoiler: after he loses his memory.]]
* WeakWilled: Somewhat. He can't handle the existence of the Mist, which Aphrodite cites as her reason for staying away.

!!Marie Levesque
Hazel's deceased mother, who worked as a fortune teller in New Orleans.

* AbusiveParents: Became this when possessed by Gaea.
* BeCarefulWhatYouWishFor: She was very poor and couldn't escape poverty. When the spell she cast summoned Pluto, they dated, and after Hazel was born, Pluto promised her anything she wanted. She asked for all the riches under the earth, and Hazel got the power to summon and control jewels and precious metals... but everything she summons is cursed, unless she or Pluto touches it. Everything Marie sold brought horrible fates to those who bought them, and she ended up just as poor.
* DemonicPossession: She often gets possessed by Gaea.
* DyingAsYourself: [[spoiler:Only came back to her normal self before dying with Hazel on the sinking island]].
* {{Expy}}: Of Marie Laveau, the Voodoo Queen of New Orleans, although she lived significantly later (though considering the rumors that Laveau somehow became immortal, one has to wonder...)
* FortuneTeller: She was a con artist, although [[spoiler:Hecate says she had magic of her own.]]
* MissingMom: To Hazel.
* MyGodWhatHaveIDone: [[spoiler:Just before Alcyoneus is about to rise, she realizes what her selfishness caused and is willing to give up her life to save Hazel. However, Hazel doesn't let this happen and instead dies with her to delay Alcyoneus's rise]].
* PosthumousCharacter
%%RaginCajun

!!Grandmother Zhang
Frank's grandmother, who was his guardian after his mother's death.

* {{Animorphism}}: [[spoiler:Turns into a vulture after the family mansion burns down.]]
* CoolOldLady
* GoodIsNotNice

!!Emily Zhang
Frank's deceased mother, who died in the war against Afghanistan.

* ActionMom: Not only did she serve on the front lines in Afghanistan, she could also [[spoiler: turn into animals]]!
* {{Animorphism}}: [[spoiler: The Zhang gift.]]
* DeceasedParentsAreTheBest: Frank remembers her fondly.
* DotingParent: When she was alive.
* HeroicSacrifice: She died in the war to save her fellow soldiers.
* LadyOfWar: Described as being very calm and graceful, but an excellent fighter.
* LoveWillLeadYouBack: An inversion -- after never seeing Mars for years, it's implied that she went to war in Afghanistan because she thought she'd meet him there. Whether this was true or not, we don't know, sadly.
* MamaBear: Figuratively [[spoiler:and literally. She turned into a bear to protect her son from one.]]
* MissingMom: To Frank.
* PosthumousCharacter: Deceased by the story proper.
* TheSquadette: Was one of the first female Canadians to serve on the frontlines during the war.

!!Esperanza Valdez
Leo's deceased mother.

* DeceasedParentsAreTheBest: When Leo's not angsting about [[spoiler: killing her with his fire powers]], he remembers her fondly.
* DotingParent: As much as she could, when she was alive.
* MeaningfulName: Her name means "hope".
* MissingMom: To Leo.
* PluckyGirl: Described as such in the backstory. Despite the discrimination and hardships she faced she was always determined, optimistic, and kind, as well as a doting parent to Leo.
* PosthumousCharacter: Deceased by the story proper.
* SpicyLatina: Averted. She was described as being very warm and friendly, as well as satisfied with her living conditions as long as she had Leo.
* WrenchWench: Very talented with machines, which, perhaps unsurprisingly, attracted the attention of Hephaestus.

!!Jane
Tristan [=McLean=]'s secretary, and the one who minds Piper when he's busy.

* BeleagueredAssistant: Looking after the rebellious kleptomaniac Piper can't be easy.
* PrimAndProperBun: She's described as wearing her hair up in a bun at all times.
* ResentfulGuardian: To Piper.
* WeakWilled: [[spoiler: According to Medea, and it's true, seeing how easily Medea was able to order her around.]]

!!Sammy
Hazel's almost-boyfriend from her time in New Orleans. [[spoiler: His surname just happens to be Valdez, and he's Leo's great-grandfather]].

%%TheCharmer
* ClassClown: Seemed to be one during Hazel's schooling years.
* FirstLove: For Hazel.
* GenerationXerox: His [[spoiler: great-grandson Leo]] looks exactly like him.
%%NiceGuy
* TheOneThatGotAway: To Hazel. According to Gaea, had she lived Hazel would have grown up to marry him.
* OnlyFriend: To Hazel.
* OnlyOneName: He's only known as Sammy, nothing more. [[spoiler:Until ''The Mark of Athena'', where it turns out his surname is "Valdez", same as Leo's]].
* SatelliteLoveInterest: Not much is known about him as a character other than being Hazel's FirstLove [[spoiler:and Leo's great-grandfather]].
* TwoferTokenMinority: Mexican-American, so he jokes that the St. Agnes School for Colored Children and Indians should have given him a double scholarship.
* WhatCouldHaveBeen: InUniverse: If Hazel had stayed in New Orleans, she would have grown up to marry Sammy.

!!Julian Ramirez-Arellano
Father to Reyna and Hylla and lover to Bellona, a soldier who went off to fight in Iraq.

* LoveMakesYouCrazy: [[spoiler: His love for Bellona coupled with his [=PTSD=] turned him into a borderline abusive, overprotective father to Reyna and Hylla. By the time of his death he'd degenerated into a ''mania.'']]
* ShellShockedVeteran: Was never quite the same after his turn in Iraq.

!!Dr. Howard Claymore
A mortal living in Keeseville, New York. A scholar who gives lectures when he's not writing and finds his life and everything he knew turned on its head after meeting Alabaster Torrington. Shows up only in a short story, ''Son of Magic'', at the end of ''The Demigod Diaries''.

* AwesomenessByAnalysis: He can understand Latin, which gives him an edge when Lamia uses Latin spell incantations, as he can make pretty good guesses what's about to happen. His observations of how quickly Lamia can pull herself together after being wounded also works to his advantage, [[spoiler: or seems to. See UnwittingPawn]].
* BadassNormal: Fights Lamia with just a 9mm pistol and GoodOldFisticuffs.
%%BreakTheHaughty
* {{Determinator}}: Started with no advantages in life, but still was able to get a [=PhD=] and become a successful author, and has no intention of letting gods or monsters get the better of him.
* HeroicSacrifice: [[spoiler:Attacks Lamia one final time to give Alabaster time to escape]].
* ProperlyParanoid: His outer fence is well away from his house, which has a state-of-the-art security system, and a gun in each room. And he knows how to use them, too.
* SpiritAdvisor: [[spoiler: After his death, Hecate makes him one for Alabaster]].
* UnfazedEveryman: Thought he's only just become aware of the existence of gods and monsters, he just considers then another problem to be solved through his usual, logical method.
* UnwittingPawn: After defeating Lamia, he goes off to find Alabaster, unaware that [[spoiler: Lamia let him win and then followed him to the demigod's safe house]].
* WouldHitAGirl: [[spoiler:Holds his own against Lamia and shows no qualms about beating her up while she keeps trying to regenerate]].
* YouRemindMeOfX: [[spoiler:Hecate tells him that he reminds her and Alabaster of Alabaster's father]].
[[/folder]]

* {{Badass}}: So far, the only demigod to basically fight and beat a Giant completely unaided. Sure, there was a god there, but come on. The god in question didn't help at all. [[note]]Percy uses the disembodied stone head of the Roman God Terminus to smash in said giants' face.[[/note]]

* OneManArmy: [[{{Badass}} Percy]] + [[MakingASplash Water]] = [[PersonOfMassDestruction Unstoppable Machine of Destruction]]

* {{Badass}}: She proves herself to be a competent fighter on more than one occasion, and accomplishes a lot even outside of combat. A shining example is how she defeats [[spoiler:Arachne]], all by herself, with ''nothing'' but her wits and a modified ScheherezadeGambit.

* {{Badass}}: He took on Enceladus and won. What more needs to be said ?

* {{Badass}}: She can hold her own with Katoptris and save the day with charmspeak, particularly evidenced with the former when she defeats Khione a second time and with the latter [[spoiler:when she puts Gaea to sleep]].

* {{Badass}}: His powerful fire abilities and great mechanical genius easily qualify him for this trope.

* {{Badass}}: He's quite a good shot with a bow and quiver of arrows, and becomes more and more competent over the course of ''Son of Neptune''.
** As of ''The House of Hades'', Frank is full-on ''sprinting'' after Percy [[{{TookALevelInBadass}} with all the level grinding he's gotten in.]]

* {{Badass}}: Knocked out Keto, a primordial goddess, with a kick to the back of the head in ''Mark of Athena''.

* {{Badass}}: He beat Percy in a sword fight, who compared him to Ares.

%%CoolOldLady
%%GoodIsNotNice

** He's also this to Will Solace, both are descended from Apollo, but while Will who is more of a medic than a seer wants to help makes peace, Octavian wants to destroy the Greeks, Will explains that what Octavian was doing was Not what Apollo would want.

** Recurring character trait since PercyJackonandTheOlympians

* EverythingSoundsSexierInFrench: It's the language of love, so she can speak it. Piper's a polyglot.

* BlondGuysAreEvil: He has blond hair, described as the color of "overcooked spaghetti" by Nico, and is an antagonist.

* HeroOfAnotherStory: The sequel series, TheTrialsOfApollo, has him as a main character.

* BadassFamily: Her mom is the Greek goddess of strategy (a subset of war), her dad is willing to fly in on a biplane to gun down monsters trying to hurt his daughter, her cousin [[Magnus Chase and the Gods of Asgard Magnus]] is [[spoiler:the demigod son of the Norse god of kingship, sunlight, and summer as well as an Einherji, a formerly dead hero who has been granted various physical boons and ResurrectiveImmortality in Valhalla]], on top of having the most prominent son of Poseidon in the modern era as her boyfriend.

* BadassFamily: Her mom is the Greek goddess of strategy (a subset of war), her dad is willing to fly in on a biplane to gun down monsters trying to hurt his daughter, her cousin Magnus is [[spoiler:the demigod son of the Norse god of kingship, sunlight, and summer as well as an Einherji, a formerly dead hero who has been granted various physical boons and ResurrectiveImmortality in Valhalla]], on top of having the most prominent son of Poseidon in the modern era as her boyfriend.