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Characters: The Heroes of Olympus

Characters who appear in The Heroes of Olympus. For characters from Percy Jackson and the Olympians (and elaboration on tropes returning in recurring characters), check out the previous series' character sheet. Note that spoilers from the previous series and several other spoilers may be unmarked.


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The Seven

The seven demigods of the Second Great Prophecy.

    General 

    Percy Jackson 

Perseus "Percy" Jackson

"Only a thousand times? Oh, good...I thought we were in trouble."

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

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

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


  • The Ace: At first, he was presented as this to both the new heroes, who either heard of his greatness (Piper, Jason, and Leo) or experienced his combat prowess firsthand (Frank, Hazel). Also on a meta level to the audience, who know of his five books' worth of Character Development and badassery increase. This is increasingly subverted as the books go on, however, especially in The House of Hades.
    • Broken Ace: His guilt and insecurity about the price of reaching his current status come to a head in The House of Hades.
  • Ambadassador: He was memory-wiped and sent to Camp Jupiter as part of Hera's plan to get the rival camps to trust each other through an "exchange of leaders," trading places with Jason. He was chosen because of his power and general badassery.
  • Amnesia Missed A Spot: He remembers only Annabeth, and only very dimly.
  • Amnesiac Hero: Along with Jason, as part of Hera's plan, he doesn't remember anything.
  • Amnesiac Lover: At the beginning of The Son of Neptune, the only thing he remembers is Annabeth's name. He gets better.
  • 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 
    • Badass Boast: Percy was rather fond of these during the first series, and the trait carries on here. Two particularly memorable ones during The Son of Neptune were:
      • Percy to Polybotes, “You. Me. To the finish.”
    Percy: Twelfth legion FULMINATA.
    • The Twelfth Legion Eagle he was holding then shot out a thousand blasts of lightning that basically annihilated the Giants' entire center line due to Percy's willpower. BAD ASS.
  • Babies Ever After: Doesn't actually happen, but he starts thinking about living in New Rome with Annabeth and having kids when he sees all the children running around.
  • Batman Gambit: Forces Gaea into helping him defeat Phineas, knowing that she considered him more useful than Phineas. It works.
  • Battle Couple: With Annabeth, his girlfriend. The fourth book pits the two of them against Tartarus, and they depend on each other to find their way out.
  • Berserk Button: Betrayal. Even the insinuation that he (or his friends) could be traitors is enough to hit this. note 
  • Big Brother Instinct/A Father to His Men: As in the original series, Percy understands how much more powerful he is than the average demigod, and he is entirely unafraid to use that power to take on entire armies to save his friends and allies.
  • Big Brother Mentor: To Hazel and Frank, who are far more inexperienced than he is in Son of Neptune.
  • Big Damn Heroes: Riding to New Rome's rescue.
  • The Big Guy: Of the non-Dumb Muscle variety. He is this to Hazel and Frank in Son of Neptune, as the only seasoned veteran on the quest.
    • Outright stated to be the most powerful of the Seven (now Eight) in The Mark of Athena.
  • Break the Badass/Heroic BSOD: When Chrysaor curbstomps him, he falls into a bit of a funk.
  • Spotlight-Stealing Squad: Percy is raised to praetor after fewer than 24 hours total at Camp Jupiter.
  • Stern Chase: Percy is running from Gorgons immediately prior to Son of Neptune.
  • Tall, Dark and Handsome: Dark-haired, with the good looks of a Roman god.note .
  • Team Dad: Shaping up to be like this, since he isn't the official leader of the quests he's going on. Also part of the reason Hera actually wants him on the quest.
  • To Hell and Back: Is sucked into Tartarus with Annabeth. This is the majority of their role in The House of Hades.
  • Two Roads Before You: A happy life under the sea, or misery and world-saving.
  • Undying Loyalty: His Fatal Flaw from the previous series appears, downplayed, in the third and fourth books: He falls into Tartarus with Annabeth instead of letting her fall by herself. Later, when someone has to hold the elevator button for the Doors of Death and Bob is too incapacitated trying to save his and Annabeth's asses, Percy tries to get Annabeth to go on without him so he can at least die with Bob. Annabeth is having none of it.
  • Worf Had the Flu: He is the most powerful of the Seven. The only person who can take him in a straight fight in the entire series is Chrysaor, and he is a son of Poseidon himself.
  • Why Did It Have to Be Snakes?: Or rather, airplanes. In Son of Neptune, Percy quickly decides he would rather be driving or running from Laistrygonians and heading towards Alaska on the ground, than flying far out of their reach in an airplane. Not that he has much choice in the matter. This is carried over from the previous series, where Percy doesn't want to ride on planes because Zeus might smite him, as a son of Poseidon, for moving in his domain.
  • You Are Worth Hell: Chooses to fall into Tartarus with Annabeth rather than lose her again.
    Percy: We're staying together. You're not getting away from me. Never again.
  • Traits carried over from series one: Achilles' Heel (for awhile), Animal Talk, Fatal Flaw, Green Eyes, Heroes Prefer Swords (and Cool Sword), Human Mom, Non-human Dad, Indy Ploy, Making a Splash, Meaningful Name, Nigh-Invulnerability (though he loses it pretty quickly), Olympic Swimmer, Only Known by Their Nickname, Person of Mass Destruction

    Annabeth Chase 

Annabeth Chase

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

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

Annabeth is stern and strict, but ultimately deeply caring and loyal. As one of the most experienced on the team, she serves as an adviser and Cool Big Sis to the more inexperienced heroes.

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


  • Academic Athlete: Spends ninety percent of her time either designing buildings for Olympus, being a straight-A student, or fighting tons of Greek monsters.
  • Action Girl: Even with no special powers other than her wits to aid her, Annabeth is quite the terror with a dagger.
  • Awesomeness by Analysis: Outwits the ghosts of Mithras's followers just by making observations about the information about their worship decorating the cavern walls.
  • 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 Arachne, all by herself, with nothing but her wits and a modified Scheherezade Gambit.
    • Badass Bookworm: As a daughter of Athena, she loves knowledge, and is frequently seen with some sort of reading material.
    • Badass Normal/The Team Normal: The only one of the Seven with no magical powers save her intelligence.
  • Battle Couple: With Percy.
  • Beauty Is Never Tarnished: Despite all the hell they go through in the fourth book, Percy continuously describes her as beautiful, though this could be justified by his bias because of being her boyfriend.
  • Chekhov's Skill (or Chekhov's Classroom): The Chinese fingertrap, which she teaches Frank, and is later used in her fight against Arachne.
  • Cool Big Sis: To Piper, being the older and more experienced Greek demigod. To Frank as well, in The House of Hades he remembers her being kind, helpful, and patient towards him. As the second best strategist on the team, he looks up to her.
  • Cool Sword: Gets a sword made from a drakon's bone in The House of Hades after she loses her knife.
  • Determinator: Annabeth never gives up.
  • Friendly Enemy: With Reyna, as seen in their conversation in The Mark of Athena — despite being on opposing teams, they view each other as equals and clearly respect each other.
  • Guile Hero: Uses nothing but her wits and a modified Scheherezade Gambit against a giant spider.
  • Got Volunteered: For the quest to search for the Athena Parthenos, with no chance to say no to mom.
  • I Will Find You: In The Lost Hero, the reason she's mostly Out of Focus is because she's searching for Percy.
  • Knife Nut: Still uses the knife Luke gave her. She loses it in Tartarus, much to her chagrin, but gets a Cool Sword instead.
  • Living Emotional Crutch: To Percy. Finding him is her motivation throughout the first book. Taken to the extreme when both of them are stuck in Tartarus, having only each other to depend on physically, mentally, and emotionally.
  • Neat Freak: She keeps the Athena cabin spotless.
  • Official Couple: With Percy.
  • Out of Focus: In the first two books, since she's not part of the Power Trio in either one (Jason, Piper, and Leo in the first, and Percy, Hazel, and Frank in the second). Averted in the third, where she provides one of the four viewpoints, and who's subplot gives the third book its name. In addition, much of the fourth book is about the Seven struggling to get her and Percy out of Tartarus.
  • Red Herring: In The House of Hades, the reader is initially led to believe that she's the one Nico has a crush on. Then when Cupid shows up, it turns out to be Percy, not her.
  • Reunion Kiss: With Percy, and in front of a huge crowd of potential enemy forces, no less. Quickly turned into an emotionally-charged judo-flip into the stone pavement, but her boyfriend takes it in stride. He missed her too, after all.
  • Revenge by Proxy: Is Minerva's proxy against the Romans.
  • Scheherezade Gambit: Plays this against Arachne when trapped with her. It works.
  • Sleep Cute: With Percy in The Mark of Athena.
  • The Smart Girl: Most of the time to a fault. She was trusted with Daedalus's laptop and spent long hours engrossed in it while aboard the Argo II.
  • The Strategist: Athena is the goddess of war strategy, so all her children are good with tactics, and Annabeth especially so. Her plans have a way of coming together.
  • To Hell and Back: Is sucked into Tartarus with Percy. They get back out by walking through hell, as well as fighting him
  • The Unfavorite: Gets rejected by Athena (and her hat loses its magic!),or rather Minerva, after trying to speak up for working with Rome.
  • Violently Protective Girlfriend: For Percy.
  • Why Did It Have to Be Snakes?: Spiders, though she still manages to defeat Arachne.
  • You Are Worth Hell: Percy could've saved himself if he'd let her fall, but accompanies her into Tartarus anyway. She's painfully aware of this in The House of Hades, and briefly thinks that if he died, it would be her fault.
  • Traits carried over from series one: Action Girl, Fatal Flaw, Gray Eyes, Kissing Cousins, The Smart Girl, The Strategist, Teen Genius.

    Jason Grace 

Jason Grace

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

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

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

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

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


  • The Ace: Hazel refers to him as Camp Jupiter's "golden boy."
    • Broken Ace: In The House Of Hades. He's very hard on himself and can find it difficult to connect to people, but he's getting there.
  • Ambadassador: He was switched with Percy, memory-wiped, and sent to Camp Half-Blood as part of Hera's plan to get the rival camps to trust each other through an "exchange of leaders."
  • Amnesiac Hero: Got memory-jacked by Juno in order to set up a huge scheme to get the two camps cooperating. Half his motivation to help Camp Half-Blood was to find Hera and get his memories back.
  • Amnesiac Lover: Averted. Jason quickly reciprocates Piper's feelings, but he doesn't want to lead her on when he isn't entirely sure how he feels about her (first because of his amnesia, then because it turns out they were never dating in the first place, and then because of Reyna). As of the first chapter of Mark of Athena, he seems to have gotten together with Piper in the time between The Lost Hero and The Son of Neptune.
  • Badass: He took on Enceladus and won. What more needs to be said ?
  • Big Brother Instinct: When he finds out that Nico had/has a crush on Percy, he takes it upon himself to defend the kid whenever another group member gives him a hard time or says anything derogatory about him.
    • Also his reaction when the group reunites with Leo midway through the fourth book: Jason immediately realizes that something is wrong with his friend and asks if he's alright.
  • Blow You Away: His dad's powers give him the ability to control wind.
  • Character Development: In The House of Hades, he develops a Big Brother Instinct toward Nico and Leo, and realizes he may not truly belong at Camp Jupiter.
  • The Chosen One: The person who Annabeth would find missing a shoe from a prophecy turned out to be Jason, not Percy.
  • Close-Call Haircut: Sciron shoots some of his hair off as a display of his prowess. With a Flintlock.
  • Cool Sword/Blade on a Stick: Jason primarily fights with a coin that can turn into either a sword or a spear depending on which side it lands on.
  • Demonic Possession: Possessed by an eidolon for a short while in the third book.
  • Deuteragonist: To Percy's protagonist.
  • Easy Amnesia/Laser-Guided Amnesia: Memory-wiped by Hera as part of her plan to unite the Greeks and Romans.
  • Foil:
    • To Percy. They're both The Ace and natural leaders, but Jason is comparatively straight-laced and rigid where Percy is free-spirited rebellious thanks to their different camps and godly parents. They even look very different, with green-eyed, dark-haired Percy and blond-haired, blue-eyed Jason.
    • Bromantic Foil: To Leo, see his entry below.
  • Good Scars, Evil Scars: Has a little one on his lip from trying to eat a stapler when he was two.
  • Hero of Another Story: He was the champion of Rome during the Titan Wars and probably had gone on many epic adventures as Percy and Co. did. Unfortunately, this makes Jason something of an Informed Ability hero.
  • Human Mom, Non-human Dad: His mother is described in the original series as an eighties starlet with a poofy hairdo. His father, of course, is Jupiter.
  • Hunk: His handsome face and muscular body are given much attention (usually by Piper).
  • I Am Who?: Part of his Quest for Identity in the first book.
  • Icy Blue Eyes: They represent his aloofness, at least initially. The text describes them as so several times. Also, they're the only thing he has in common with his sister.
  • Ironic Name: In the sense that his name is derived from Greek (Iason = healer) and he's a Roman.
  • Let's You and Him Fight: Against Percy by Demonic Possession.
  • Lightning Can Do Anything: Normally he ricochets it off his sword or javelin at the intended target. Sometimes works too well, since Achelous took this card off the table, as zapping him in the river would also have meant frying Piper.
  • Long-Lost Relative: To Thalia, his older sister. He disappeared when he was two, and they don't meet again until the events of The Lost Hero.
  • Meaningful Name: Yes, just like ''that'' Jason.
  • Mysterious Past: In the first book. A new kid who calls all the gods by their Roman names, has a weapon that can slay monsters that's gold instead of bronze, knows how to fight really well and has a strange Roman motto with tick marks burned into his arm? Yeah, something's off.
  • New Transfer Student: Jason is technically one at the Wilderness School. The Mist creates fake memories for everybody so they think he'd been there for months already.
  • Nice Guy: Doesn't ever get mad when things don't go his way. Being positive comes naturally to him.
  • Official Couple: With Piper.
  • Only Friend: Is this for Nico in The House of Hades, much to Nico's annoyance. He is the Bob-2 to Nico's Alice-1.
  • Raised by Wolves: Literally. He was raised by Lupa, a wolf who trains Roman heroes.
  • Red Oni, Blue Oni: The Blue to both Leo and Percy's Red.
  • Remember the New Guy: Thalia didn't mention having a brother during the previous quintet — however, it's justified in The Lost Hero that his disappearance not only would have put the Roman-Greek split in jeopardy, but was quite traumatic for Thalia.
  • Secret Keeper: As of The House of Hades, he's the only person other than Nico himself to know about Nico's crush on Percy.
  • Shock and Awe: Having lightning powers, while draining, is definitely an impressive trump card.
  • Straight Man: Because of his seriousness, he's quite deadpan.
  • The Stoic: He's been a leader since he was young, and since his temperament sets the mood for his followers, he can't afford to get emotional. It's hardwired into him.
  • Team Dad: Acts as The Leader of the group due to his Roman upbringing being stricter than that of the Greeks', and in the third and fourth books tries to act as this for everyone else.
  • Tell Me About My Father: He asks Thalia to tell him about their mother. He isn't very happy with what he hears.
  • You Can't Go Home Again / I Choose to Stay: Even the undead legions in Epirus recognize his subconscious desire to stay at Camp Half-Blood, and thus refuse to recognize him as a praetor. He realizes it himself.

    Piper McLean 

Piper McLean

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

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

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

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


  • Action Girl: Her only power is charmspeaking, but its powerful enough to daze enemies, knock people asleep, or reverse a tree's growth. And with her dagger? The giant she saved Leo from won't be messing with anyone soon.
    • In the fourth book, Jason mentions she's been taking swordfighting lessons from Hazel.
  • Affirmative Action Legacy: Native American. Specifically, Cherokee.
  • Bound and Gagged: In all three books she appeared so far.
  • Braids of Action: Normally wears her hair in a long braid down one side with a bird feather. Annabeth has no idea where she finds the time to do it aboard the Argo II.
  • Charm Person/Jedi Mind Trick/Compelling Voice: Like a few other children of Aphrodite, Piper has the ability to 'charmspeak' people, which basically amounts to getting people to do things you want them to do, sometimes without them knowing.
  • The Chick: Being the daughter of Aphrodite, when sometimes she thinks of charmspeaking as nothing more than having a "pretty voice", and a dagger that's not really meant for combat? Piper sometimes feels like she falls into this when it comes to the seven.
  • Cool Loser: While at school, she has all of two friends and is shunned despite her beauty and personality.
    Leo: ...if those girls found out the truth about her dad, they'd all be bowing down to her screaming, 'We're not worthy!'.
  • Conflicting Loyalty: When her father gets captured for most of the first book, she is torn between saving him (which requires pledging allegiance to Gaea) and risk his life to save the world.
  • Deadpan Snarker: Gets a moment of this in The House of Hades:
    Khione: Jason will grace my throne room.
    Piper: Clever. Take you all day to think up that line?
  • Everything Sounds Sexier in French: It's the language of love, so she can speak it. Piper's a polyglot.
  • Fake Memories: Her relationship with Jason was thanks to Mist manipulation.
  • First Girl Wins: Introduced as the first person Jason meets on the bus and his girlfriend. It turns out they weren't dating to begin with and it was all just fabricated memories of the Mist, but over the course of the first book they have genuinely grown to have feelings for each other. Despite Jason remembering a girl he was close to back in Camp Jupiter, Reyna, he's gotten together with Piper in the time between the two books.
  • Hair Decorations: Wears a feather in her hair with her braid.
  • Heart Is an Awesome Power: Ratchets her use of her Charmspeak up to awesome levels in The House of Hades, where she uses it to defeat Zethes, Calais and Khione. Said defeat included using Charmspeak to power up the deactivated Festus.
  • Human Mom, Non-human Dad: Inverted; her mother is a goddess and her father is a mortal actor.
  • I Just Want to Be Normal: Several times Piper wishes she weren't a demigod so she could live a normal life.
  • Improbable Weapon User: From Mark of Athena and onwards, she uses a food-shooting cornucopia as one of her weapons.
  • Kaleidoscope Eyes: Her eyes are a mix of brown, blue, and green.
  • Knife Nut: Wields Katoptris, a dagger once held by the Helen of Troy. It can see the future. It was used as a ceremonial weapon, although it can still kick monster ass.
  • Like Brother and Sister: Leo's the annoying little brother she never had. She'll still kill even a giant if they mess with him, though.
  • The Load: She feels like this among the Seven, being one of two members of the team without powers directly useful in physical combat — the other is Annabeth, who more than makes up for it with smarts and combat experience. Then she learns she can use her charmspeak in truly powerful ways.
    "Piper had a new entry in her top-ten list of Times Piper Felt Useless. Fighting Shrimpzilla with a dagger and a pretty voice? Not so effective."
  • Lonely Rich Kid: Her classmates don't know about her movie star father, and she's shunned because she's "different." Hence her fear and possessiveness over Jason.
  • Love Hurts: Finding out your boyfriend has amnesia and that he was never really your boyfriend in the first place is a lot to take in.
  • Meaningful Name: The name is Piper. Pied Piper. The Charmspeak, y'know.
  • Missing Mom: Aphrodite was absent from her life for a long time, and Piper is not happy about it.
  • More Than Mind Control: The key to using her charmspeak powers properly, as she works out in the fourth book.
  • Mundane Utility: Uses her cornucopia to pop out food for her picnics.
  • Noodle Incident: "I'm...not good with cows."
  • Obliviously Beautiful: Didn't really realize how pretty she was until she was claimed as Aphrodite's daughter.
  • Official Couple: With Jason.
  • Plucky Girl: Piper always remains positive despite all the troubles she goes through as part of the Seven.
  • Real Women Never Wear Dresses: She seems to have ingrained this into her mentality — she expresses disdain for her more stereotypically feminine mother and siblings and their corresponding ineffectiveness in battle.
  • Second Love: May be this to Jason, depending on just how close Jason and Reyna were before he was memory-wiped.
  • The Power of Love: Her voice is enough to revive Jason even after his brain's been fried by Hera/Juno's true form.
  • Secretly Wealthy: Her classmates never catch on that she's a Hollywood kid.
  • Seer: By looking into her dagger like a looking glass. Most of the time it shows her the most horrible parts of her present and future. At one point she wonders how Helen of Troy stayed sane with it...and then realizes that she probably didn't.
  • Spoiled Sweet: Is the daughter of famous actor Tristan McLean and isn't very spoiled, other than her justified desire to spend some quality time (that is, longer than five minutes) with said busy parent without any interruptions.
  • Sticky Fingers: She's a kleptomaniac on record — however, this was only to get attention, and she wasn't consciously stealing, just using her charmspeak.
  • Tomboy: Piper despises stereotypically girly things.
  • Tsundere: Type B. She's usually pretty nice, but can be snappy.
  • Two Girls to a Team: After Annabeth falls into Tartarus with Percy at the end of Mark of Athena, she and Hazel are the only girls on the Argo II for most of The House of Hades. They end up bonding over this.
  • Unkempt Beauty —> Beautiful All Along/She Cleans Up Nicely: After she receives Aphrodite's blessing, which gives her an entirely new makeover that only lasts temporarily.
  • Unnecessary Makeover: An in-universe example according to Jason — she was already lovely before Aphrodite's claiming gave her a makeover.
  • The Unfavourite: She feels like she's become this to Aphrodite after hooking up with Jason, because having successfully become the girlfriend of the guy she's in love with, she's become less interesting as a person to her mother (who outright says that she thinks of the Seven as stories, as opposed to actual people).
  • Well Done Daughter Girl: Rarely got to spend any real time with her dad. She stole things to get his attention, and has a game that they play in place of bonding, initially.
  • What Kind of Lame Power Is Heart, Anyway? —> Heart Is an Awesome Power: Charmspeak.
  • What Would X Do?: After Annabeth falls into Tartarus with Percy, Piper finds herself wondering what Annabeth would do in her situation of defeating Khione, Zethes, and Cal.

    Leo Valdez 

Leo Valdez

"Delaying death is my favorite hobby."

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

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

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


  • Affirmative Action Legacy: Latino.
  • All Girls Want Bad Boys: Mocked with Narcissus's nymphs — he pretends to be a loud and obnoxious "bad boy" who thinks he's better than Narcissus to distract him and the nymphs from noticing Hazel stealing the bronze.
  • Alone Among the Couples: In book three, where everyone else is paired off. That said, Leo has crucial ties to all three of the couples. **
  • Badass: His powerful fire abilities and great mechanical genius easily qualify him for this trope.
  • Bag of Holding: Leo's magic toolbelt. It can hold anything that fits into his pockets, and can produce anything that would reasonably be found inside of a garage.
  • Beware the Nice Ones: Leo is the most friendly and cheerful of our new characters. He is also one of the most dangerous, having powers he can't always control.
  • Bromantic Foil: Jason's best friend. He's also louder, funnier, wirier, and more into girls.
  • Calling the Old Man Out: He talks back to his dad in a way that not even Percy Jackson would've, and he doesn't even get struck down- if anything, it actually gets him respect.
  • Casanova Wannabe: Leo is fond of hitting on pretty girls out of his league. In The House of Hades, he laments not being as hunky as Jason, because that would have gotten him out of his current situation.
  • Dark and Troubled Past: Apparently accidentally killed his mother with his fire powers. He also had a divine grandma who (sort of) tried to kill him several times. Not to mention Gaea messing with his head.
  • Demonic Possession: He gets possessed by an eidolon, which makes him open fire from the Argo II onto New Rome and incurs the fury of the Romans against the Greeks.
  • Drop the Hammer: Sometimes uses a sledgehammer in combat.
  • The Engineer: Like all of Hephaestus's kids, he's good at building and fixing, but Leo's an especially prodigious one. He kept Festus going and built the Argo II.
  • Everyone Knows Morse: Leo learned it from his mother as they used it to keep track of each other when at her workplace. Only Leo is shown to know it and it doesn't serve any real plot relevant purpose except when Festus gives Leo a final message.
  • First Kiss: For all of Leo's flirting, he's never been kissed until he leaves Calypso's island.
  • Gadgeteer Genius: Even when Leo's doing nothing in particular, he still can fashion incredible machines. When he puts his mind to something, he can make automatons or huge warships.
  • Generation Xerox: He’s a dead ringer for his great-grandfather, Sammy Valdez.
  • Grease Monkey: As the team mechanic, he's always running around greased due to constantly fixing things.
  • Heartbroken Badass: Becomes this around three quarters of the way through The House of Hades after he ends up on Calypso's island, falls in love with her, and then is forced to abandon her. He is noticeably different for the rest of the book, less twitchy, more serious, and well, in the words of Jason:
  • Height Angst: He is short and skinny, which does a number on his self-esteem, especially with his male compatriots all being tall and muscular save Nico.
  • Human Mom, Non-human Dad: His dad is Hephaestus.
  • Identical Grandson: He resembles his great-grandfather, Sammy, so much that Percy and Hazel think he's actually Sammy when they first get a look at him.
  • In Love with Love: Leo pretty much falls for any girl who's out of his league, namely Khione and Thalia. Though, he gets over Khione rather quickly when she reveals herself to be a villain.
  • Infinite Supplies: That toolbelt of his is enchanted to "contain anything that could be found in a garage", which includes everything from small tools and materials, to a sledgehammer, to taco ingredients, to breath mints.
  • Improbable Aiming Skills: Hits an elevator button from thirty feet away by chucking a screwdriver like a throwing knife.
  • Just Friends: With Hazel.
  • Like Brother and Sister: With Piper. Despite her beauty, he never hits on her or asks her out, and they treat each other like affectionate siblings.
  • Keet: He's fun-loving and always full of energy and good times. He's got so much nervous energy that he's got to constantly keep his hands moving. It has even been noted that his ADHD is still exceptional, even for a demigod.
    ALL DA LADIES LUV LEO
  • MacGyvering: Being a child of Hephaestus, tinkering and building comes naturally, but he also has an infinite supply of tools (due to his tool belt) as well as his fire-controlling ability (which he uses to bake bricks and weld metal). Heck, when he crash-landed on Ogygia, literally all Leo had were the clothes on his back, his tool belt, and the Archimedes Sphere. He managed to cobble together a very slap-dash but functional personal helicopter in about thirty seconds. It chugged along for a few seconds before promptly exploding, but at least the blast saved him from becoming a bloody splat on the beach below.
  • Man on Fire: The first child of Hephaestus to be born in decades with the ability to summon fire. It only makes Leo more nervous since not only does he have a fifty percent chance of destroying the world, but he could also very easily kill another member of the seven.
  • Mayfly-December Romance: He falls in love with Calypso, a Titan's daughter and minor goddess.
  • Melt A Snow Goddess With Fire
  • My Greatest Failure: After he thought that he killed his mom, Leo didn't want to use his fire powers ever again before his quest with Jason.
  • Playing with Fire: Leo is the first son of Hephaestus to have this ability since 1666.
  • Plucky Comic Relief: Always count on Leo to be able to diffuse the tension or solve problems by being his goofy self.
  • Replacement Goldfish: Hazel worries about seeing him as a replacement of her first boyfriend Sammy, his great-grandfather. She seems to be moving past it by the fourth book.
  • The Runaway: Ran away from home six times.
  • Sad Clown: He smiles and jokes since its easier than being sad about things he can't change or that scare him. Subverted, since Jason notes how important Leo's sense of humor is to team morale.
  • Self-Made Orphan: This is the reason why he is initially afraid of his fire powers: when he was a kid, Gaia visited the workshop where he and his single mother were, with the firm intention of preventing Leo from becoming a powerful enemy; he used his powers to try and protect his mother, but lost control and started a fire, accidentally killing her instead. He still has his father, but since he's the god Hephaestus whom he only met at 15...
  • She Is Not My Girlfriend: Says this almost word-for-word when Calypso assumes that Reyna is the Penelope to his Odysseus (or Annabeth to his Percy, or Elizabeth to his Sir Francis Drake).
  • Stepford Smiler: Type A. He's upbeat and friendly on the outside, but melancholy and lonely on the inside.
  • Team Chef: Able to whip up pretty boss veggie tacos anywhere and anytime you could possibly want them. Just ask Piper or Jason.
  • Trickster Archetype: He's described as having a devilish smile that makes people go "Don't even think about it!" Probably for good reason.
  • Tsundere: Type B, at least towards Calypso when he's marooned on her island.
  • Utility Belt: A thick leather tool belt with a LOT of pockets. Contains all sorts of tools and switches, bits and bobs, odds and ends, oh, and a sledgehammer.

    Frank Zhang 

Frank/Fai Zhang

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

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

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

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

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


  • Achilles' Heel: His life force is bound to a stick of wood. If/when it burns up, Frank will die.
  • Affirmative Action Legacy: Chinese-Canadian.
  • Animorphism: The Zhang family gift.
    • Scaled Up: In Mark of Athena. He can turn into a dragon at full power, meaning he isn't limited to normal animals.
  • 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.
  • Bad Bad Acting: Frank has many talents, acting is not one of them.
  • Big Fun: The first thing that jumps out to Percy is that he's like a baby panda.
  • The Big Guy: Lampshaded repeatedly. It's easy to lose track of how many times the text refers to him, verbatim, as "the big guy." Further solidified with his One-Man Army stint in the fourth book.
  • Calling the Old Man Out: His dad is Mars, and considering his mom died in war, Frank’s not happy about it. See Your Approval Fills Me with Shame below.
  • Determinator: Fights to free Thanatos even if it means literally burning his life away.
    • Becomes this in full in The House of Hades, taking Jason's place as Praetor, and doing a complete 180 from his first appearance in The Son of Neptune.
    • It's directly stated by Mars that Frank will have to save the quest by helping Percy to make a Sadistic Choice that his Fatal Flaw would never let him make.
    • Outright stated that this is why Gaea wants him dead. Because of his sense of duty and self-sacrifice, he's the only one of the seven that she can't manipulate.
  • Distressed Dude: Percy pulls a Big Damn Heroes to save him from the Gorgon sisters near the beginning of Son of Neptune.
  • Drama-Preserving Handicap: Frank has to be really careful around fire. (He is understandably somewhat uncomfortable around Leo.)
    • Mentioned in universe — because of his powers from his mom's side and being Mars' son and having his tactical powers, he has "too many gifts." Ergo, Fate basically decreed he have a limit.
  • Embarrassing First Name: Frank's grandmother is the only one to call him by his Chinese name, Fai.
  • Everyone Is Related: He’s a descendant of Poseidon on his mother’s side, making him a distant relative of Percy.
  • Field Promotion: Jason promotes him to praetor in the midst of a battle in the fourth book.
  • Hearing Voices: In The House of Hades it's revealed Ares's and Mars's voices have been bickering in his head for a while, and is a major factor towards his hostility towards Leo. Given how different those two facets of his father are, it can't have been pretty.
  • Heroic Self-Deprecation: As his father pointed out, he considers Percy better than him and constantly dumps on himself, at least until near the end when Character Development kicked in and he became more confident.
  • Heroic Sacrifice: Subverted, but it's a very narrow thing. See Determinator above.
  • How Do I Shot Web?: It takes Frank almost until the very end to figure out how to activate his family's gift.
  • Human Mom, Non-human Dad: Mars took a shine to his mom.
  • I Got You Covered: Frank to Hazel and Percy while they were escaping from the Zhang residence. Percy to Frank in Alcyoneus’ lair.
  • Immune to Fate: Mentioned as why Gaea is willing to kill him, she can't predict his future, or manipulate him emotionally. His freedom of choice and ability to change also connects to his unique talent, shapeshifting. Notably, he IS cursed with a short life, as a price for his many powers; it's just no one can predict the how and when.
  • Lineage Comes From The Godly Parent: Played with. Even though he's a son of Mars, Frank's coolest power comes from his mortal mother.
  • Military Brat: His mom was in the Canadian military, and was one of the first women to die in combat, according to Frank.
  • My Species Doth Protest Too Much: He starts out as a child of the god of war who hates war while all of his siblings are Blood Knights.
  • Official Couple: With Hazel.
  • One-Man Army: Was granted the blessing of Mars in the fourth book, temporarily turning him into one of these.
  • Sitcom Archnemesis: With Leo, though it's kind of understandable as Frank's life is tied to a stick and Leo has hard-to-control fire powers. They seem to be moving past it when Leo gives him a fireproof pouch to carry his firewood in.
  • Second Love: To Hazel, after Sammy.
  • Secret Legacy: Descended from Periclymenus, one of the Argonauts, on his mom’s side.
  • Secretly Wealthy: The Zhangs are loaded, but you couldn't tell that by looking at Frank.
  • Shout-Out: To Meleager, whose life was tied to a piece of wood and was killed when his mother threw it in the fire.
  • The Straight and Arrow Path: Is a really good shot with a bow and arrow, despite this being set in the 2010s.
  • The Strategist: Got this as a power from his dad, Mars. He does most of the battle tactics when Annabeth is out of the picture.
  • This Is for Emphasis, Bitch!: "Welcome to Canada, idiot."
  • Took a Level in Badass: In The House of Hades after managing to defeat every katobleps in Venice, getting taller and buffer. Hazel notes that something's different about his personality, though. And later again when Jason emergency-promotes him to Praetor, giving him command of a full Epirus ghostly legion.
    • He worries that his drastic change in appearance and demeanor will make the others treat him differently. Hazel does not mind.
  • Your Approval Fills Me with Shame: Feels this way about Mars boasting about him after the war games, but subverted after Mars appears to him in Venice.

    Hazel Levesque 

Hazel Levesque

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

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

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

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

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


  • Action Girl/Badass: Causing precious metal avalanches and holding off the Romans atop Arion with her cavalry sword is just another day for her, being one of the seven.
  • Affirmative Action Legacy: Black.
  • All of the Other Reindeer: Got picked on a lot as a kid in New Orleans. Camp Jupiter wasn’t all that much better.
  • Artifact of Death: Capable of summoning gems and metal from the earth, but misfortune comes to anyone who takes them. These cursed rocks don't effects her Cool Horse, who eats the gold she pulls up.
    • Notably Laser-Guided Karma to her mom, who wished the "gift" onto her — ruining her life.
  • Back from the Dead: Spent 70+ years in the Fields of Asphodel after she sacrificed her place in Elysium to keep her mother out of the Fields of Punishment. Got out after Nico, after discovering that Bianca had already chosen to be reborn, rescues her instead.
  • Be Careful What You Wish For: Pulls up cursed riches due to mommy's request gone wrong.
  • The Big Easy: Lived almost her whole life in the French Quarter of New Orleans with her mom. Even in her new life, she originally finds it very hard not to spend half her time back there, one way or another.
  • Big Sister Instinct: While it's hard to say whether Hazel or Nico is officially the older sibling (Hazel was born first but died at 13 and hasn't aged a full year yet, while Nico is a "few" years younger chronologically but has actually celebrated 14 birthdays), it is not a question that Hazel doesn't appreciate anyone questioning the wisdom of saving Nico's life.
  • Blessed with Suck: Her dad's Pluto, so she has control of "all the riches under the Earth". It's a pretty sweet deal, unless a horrible curse wasn't directly tied to how valuable the metals were. So, if you aren't her, touching the metals she summons is bad for your health.
  • Cool Horse: Is the only person the Cool Horse, Arion, will listen to (thanks in no small part to her gold-producing powers).
  • Curtains Match the Window: Downplayed, she has caramel hair and gold eyes but these traits together aren't mentioned.
  • Daddy Had a Good Reason for Abandoning You: Pluto. His deliberately turning a blind eye to her means she won't have to go back to the Underworld, even though she's supposed to be dead. This also means he can never acknowledge her presence, making him one of the Gods to actually obey Zeus' orders to ignore demigods.
    • Uniquely, he is also one of the few godly parents who doesn't choose to abandon his kids. Hazel's mom refused him.
  • Dark and Troubled Past/Dark Secret: Was forced by Gaea to use her powers to reconstruct Alcyoneus in Alaska.
  • Dark-Skinned Blonde: Her hair is described as being caramel.
  • Deliberate Values Dissonance: When Hazel and Leo are dealing with Narcissus in The Mark of Athena, she's as enraptured as any of the nymphs. Until he makes a remark about how Narcissus loves "him". Hazel turns up her nose and doesn't think anything of him anymore. She's from the 1940s, so it's a nod to how certain attitudes from seventy years ago are still ingrained in her.
  • Dishing Out Dirt: Daughter of Pluto. Unlike Nico, she got the "god of wealth" half as opposed to the "god of death" half. Unfortunately, her power is mostly limited to precious gems and metals. It's also the curse her mother saddled her with.
  • Fish Out of Temporal Water: Spent over seventy years wandering the Fields of Asphodel. Nico brought her back.
  • Foreign Cuss Word: "As Hazel marched up the hill, she cursed in Latin. Percy didn't understand all of it, but he got son of a gorgon, power-hungry snake, and a few choice suggestions about where Octavian could stick his knife."
  • Hate Plague: The other reason why it sucks to be a child of Hades/Pluto. Wherever she goes, she is deeply feared and hated by almost everyone around her (save for her close friends).
  • Heroic Sacrifice: Killed herself and her mother to stop Gaea from raising Alcyoneus and then gave up Elysium so her mother wouldn’t go to the Fields of Punishment.
  • Human Mom, Non-human Dad: Her mother is a mortal and her father is Pluto.
  • Instant Expert: In The House of Hades, when it comes to Mist manipulation — over the course of the book she ends up better than it than a milennia-old sorceress.
    • In the Blood: It's implied that this is due to her mom being a sorceress in her own right, and a reasonably good one at that.
  • It's All My Fault: Alcyoneus coming back to life was directly Hazel's doing. Even though she was forced to by Gaea, Hazel still feels hugely guilty.
  • Just Friends: With Leo. She eventually realizes that it isn't fair to see Leo as a replacement for Sammy, and continues dating Frank.
  • Like Brother and Sister: With Percy.
  • Long-Lost Relative: To somebody we know well from Camp Half Blood. Seems to be a trend in this series. Turns out to be Nico.
  • Meaningful Name: Levesque means either somebody who served in the household of a bishop, or just bishop. Of ancient Greek origin, curiously.
  • New Powers as the Plot Demands: Can suddenly do sorcery in the fourth book, with this having never been brought up before.
    • Though it's foreshadowed when her mother reveals that she summoned Pluto with sorcery.
  • Nice Girl: Her defining trait is her kindness.
  • Official Couple: With Frank.
  • Older than They Look: Mentally, anyways. Being a child of Pluto, she remembered everything during her 70+ years in the Fields of Asphodel.
  • Pensieve Flashback: Hazel has some pretty powerful "blackouts". She even manages to pull Frank and Leo into them.
  • Resurrected for a Job: Implied as much.
  • Ragin' Cajun: Lived in New Orleans until she was 13.
  • Replacement Goldfish: Technically being Nico's sister, she has shades of this for Bianca.
  • Self-Made Orphan: She killed her mother and herself to stop Gaea from raising Alcyoneus back in 1942.
  • Supernatural Gold Eyes: Justified. She’s the daughter of the god of wealth.
  • Team Mom: Percy and Frank start depending on her for comfort in The Son of Neptune.
  • Two Girls to a Team: After Annabeth falls into Tartarus with Percy at the end of Mark of Athena, she and Piper are the only girls on the Argo II for most of The House of Hades. They end up bonding over this.
  • Weirdness Censor: Hecate tells Hazel she will have to learn to control the Mist to make it to the House of Hades.
    • Jedi Mind Trick: Hazel uses the Mist to manipulate people's perception. It's how she defeats Pasiphåe.
  • What Could Have Been: In-universe example. Had she stayed in New Orleans, Hazel would have grown up to marry her childhood friend, Sammy.

Other Demigods

    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.


  • Ancient Grome: Utterly Averted, the Greek and Roman halves of Western civilization have been opposed since the Trojan War.
  • Bling of War: The Legion wields weapons of Imperial Gold, which cuts through monstrous defenses and rips apart their essences.
  • Badass Army: 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.
  • In the Blood:
    • 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.

    Nico di Angelo 

Nico di Angelo

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

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

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

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


  • Aloof Ally: Even when working with the crew in the fourth book, Nico doesn't talk much and prefers to stand off to the side.
  • Always Second Best: Narrowly misses being the hero of the last Great Prophecy, then Hazel shafts him out of being one of the Seven.
  • Ambadassador: Serves as Hades's main liason to the outside world.
  • Animals Hate Him: Apparently, they can sense the death.
  • Armored Closet Gay: Since he hasn't defined his sexuality completely; however it's worth noting that he kept claiming to have a crush on Annabeth and the god of love had to drag out an admission that Nico crushed on Percy before Nico and Jason could proceed with their quest. Justified, though, as a demigod son of Hades not even from this century, he felt like it would only ostracize him more.
  • Ascended Extra: Goes from Demoted to Extra in the first three books to getting lots of focus in the last two.
  • Badass in Distress: At the end of the second book as a result of some Reckless Sidekick behavior investigating the Doors of Death himself, he gets captured by Gaea's forces. He's held captive in a jar throughout the third book until he's rescued.
  • Badass Gay: He has (or had) a crush on Percy and he is one of the most powerful demigods in the series.
  • Big Brother Instinct: It's hard to say whether he or Hazel is "officially" the older sibling, but Nico clearly loves her a lot, and seems to spend quite a bit of his time at Camp Jupiter talking to her and cheering her on.
  • Big Sister Worship: Less so than the previous series, but he's still pretty hung up over Bianca.
  • Black Sheep: Among the demigods, being a son of Hades and all — he just doesn't fit in.
  • Black Swords Are Better: Wields a sword made from Stygian iron, a black material from the Underworld.
  • Broken Pedestal: Downplayed. Percy was the first demigod Nico ever saw in action, and he idolized him up until Percy told him that Bianca was dead.
  • Cannot Spit It Out: In The House of Hades, he absolutely refuses to admit he has any feelings for Percy, to the point that Cupid has to force a confession out of him.
  • Cool Sword: Stygian iron, my friends.
  • Creepy Good: He is repeatedly described as unnerving and difficult to figure out by the other demigods. His penchant for Stealth Hi/Bye doesn't help.
  • Dark Is Not Evil: A child of Hades who can talk to the dead and fights with shadows and dresses in all black? Loyal to the Greeks as they come.
  • Deliberate Values Dissonance: He was raised in the 1930s, which goes a long way toward explaining why he's so ashamed to admit he had a crush on Percy.
  • Demoted to Extra: In the first three books. He plays a large role in the fourth, and will get POV chapters in the fifth.
  • Did Not Get The Guy: The guy in question being Percy Jackson.
  • Eerie Pale-Skinned Brunette: He was described as olive-skinned in the first series (as his mother was Italian), but his skin paled to white as he spent more time in the Underworld. This carries on into this series. After returning from his capture in Tartarus, his skin is described as "a sickly greenish-white, like the color of tree sap."
  • Foreshadowing: At the end of the Battle of the Labyrinth, during the massive battle, Percy notices some monsters break off from the large group and head towards the camp. He calls to Nico to stop them, and Nico summons some undead to take the monsters down. Among the undead: Roman Centurions. At Camp Half-Blood.
  • Gayngst: In The House of Hades, it turns out at least part of his broodiness and desire to stay away from others stems from his (unacknowledged and repressed) feelings for Percy Jackson.
  • Hates Being Touched: Hates touching others, too; the only person he seems to show any physical affection towards is Hazel.
  • Hopeless Suitor: In The House of Hades, it's revealed that he had a crush on Percy that started in The Titan's Curse, while Percy and Annabeth have mutual feelings for each other.
  • Human Mom, Non-human Dad: His dad is Hades.
  • Ineffectual Loner: Nico doesn't really like people and prefers to work alone, but he's forced to work with the Seven anyway. Not that he really minds.
  • Incompatible Orientation: With Percy.
  • Looks Like Cesare: Increasingly since the previous series. Leo describes his eyes as sad and tired, and accounts this to him having stared into the depths of Tartarus.
  • Loner-Turned-Friend: In the previous series, he started out as a friend but became a loner due to Bianca's death. When this series starts he's still aloof and closed-off but willing to work with the heroes, and even becomes the team's Sixth Ranger of sorts in the fourth book.
  • Meditation Powerup: The Death Trance allows him to survive with limited air by eating one seed a day to survive. The seeds in question being from pomegranates grown in Persephone's garden.
  • Messy Hair: His hair is always overgrown and shaggy.
  • Mind Rape: It is heavily hinted that this is what Nico went through as a prisoner of Gaea, to give an idea of how broken Nico was when he was finally rescued, Percy delivers this thought:
    Nico’s eyes looked like shattered glass. Percy wondered sadly if something inside him had broken permanently.
  • Necromancer: He can summon and control undead legions.
  • Necromantic: Non-villainous example. He really wanted to resurrect his older sister Bianca.
  • Nice To The Janitor: Unlike Percy, Nico visited Bob the Titan and spoke with him often, and apparently talked Percy up to him. It serves the dual purpose of saving Percy and Annabeth's lives in Tartarus and getting Percy to realize that he's neglected not just Bob, but Nico himself over the years.
  • Only Friend: Jason is this for him in The House of Hades (as Hazel is also his half-sister and his crush on Percy has complicated their friendship quite a bit.) Nico is Alice-1 and Jason acts as Bob-2. This is because he is Creepy Good and a Socially-Awkward Hero, and intentionally pushes people (including Jason) away.
  • The Promise: At the end of the third book, Percy makes him promise to lead the rest of the Argo II to Epirus to retake the Doors of Death before falling into Tartarus with Annabeth.
  • Rescue Romance: His crush on Percy started way back in The Titan's Curse when Percy saved him and Bianca from Dr. Thorn.
  • Sixth Ranger: Joins the crew of the Argo II and goes off with them to rescue Percy and Annabeth at the end of the third book.
  • Socially-Awkward Hero: Being a child of the most antisocial god doesn't bless one with good social skills.
  • Stealth Hi/Bye: Does this often, to the chagrin of his companions.
  • Suddenly Sexuality: The House of Hades reveals that he had a crush on Percy that started in the previous series.
  • Superhero Speciation: Had some instances of Dishing Out Dirt in the previous series (notably, splitting the ground open to swallow up some skeletons attacking Percy and throwing up a wall of black rock in the Labyrinth to stop some pursuers), but now that this is his sister Hazel's main ability, he sticks to his "god of death" skill set.
  • We Do Not Know Each Other: To Percy, who barely buys it. When confronted, he states that it's not his place to help Percy remember who he is.

    Reyna Avila Ramirez-Arellano 

Reyna Avila Ramirez-Arellano

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

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

Reyna displays no superpowers, but as a daughter of Bellona she is skilled with weaponry and combat. She fights with an Imperial gold spear and dagger.


  • Action Girl: As the daughter of a war goddess, she's very handy in a fight.
  • Affirmative Action Legacy: Puerto Rican.
  • Aloof Dark-Haired Girl: Is described as tall and dark-haired, with a mature and regal aura which she puts to good use as the leader of Camp Jupiter. Deconstructed as she has a Dark and Troubled Past, so she puts up a mature facade and does not allow herself to show weakness in front her subordinates, as they look to her for guidance.
  • Authority Equals Asskicking: The praetor of Rome, as well as a spear-wielding badass.
  • Badass Cape: As praetor, she wears a purple one. You gotta look good when you're kicking ass.
  • Badass Family: She and her sister are daughters of the war goddess, Bellona. One of them at a time is awesome, but when they team up, monsters should run screaming.
  • Bait and Switch: Her Official art makes her look almost like a villain.
  • Blade on a Stick: Her weapon of choice is an Imperial gold spear.
  • Braids of Action: She wears her hair in a braid.
  • Broken Bird: As of Mark of Athena.
  • Chekhov's Gunman: While not named, she actually appeared as early as Sea of Monsters.
  • Despair Event Horizon: First she lost her home to and was imprisoned for months by pirates in Sea of Monsters, then was forced to go on the run with her sister, whom she eventually parted ways with. Which was bad enough. Then in Mark of Athena, after waiting for her love interest and best friend, Jason, to return to her and having to carry on the praetorship all by herself for eight months, Jason coming home with a girlfriend in tow and war breaking out between the Greeks and the Romans within the same hour has pretty much destroyed Reyna's hope that anything good will ever happen to her again.
  • Gondor Calls for Aid: Knowing that Camp Jupiter will soon be attacked, she tells Percy to find her sister Hylla and ask her to help.
  • Friendly Enemy: To Annabeth. They're similar in that they are determined, competent leaders who want the best for their camps, and they even seem to get along fairly well when interacting in The Mark of Athena before everything goes to hell.
  • Human Mom, Non-human Dad: Presumably inverted: her godly parent is her mother, so her father would have to be a mortal.
  • Lady of War: Fits the personality traits, being calm, aloof, collected, and kickass with a spear. As a bonus, she's also the daughter of Bellona, the Roman goddess of war, specifically.
  • The Leader: As the praetor for Camp Jupiter.
    • Supporting Leader: Not in the main cast, but as the praetor she's supposed to lead the Romans.
  • Meaningful Name: Her name, like the similar-sounding Spanish "Reina," is a derivation of the Latin "Regina" (queen, counsel), and actually does mean "queen" in Filipino. Fittingly, she's the regal "queen figure" for Camp Jupiter.
  • My Country, Right or Wrong: Her loyalty is to Rome and Camp Jupiter above all else.
  • Non-Human Sidekick: Her greyhounds, Aurum and Argentum. Their names are Latin for gold and silver, which aptly describe their colors and are the metals the dogs are made from.
    • Canine Companion: Both of them accompany her around.
    • Living Lie Detector: They serve as this, too, which makes them very useful when she's interrogating someone.
    • Her pegasus, Scipio, is one too. Which makes it all the more tragic when he is killed in the fourth book.
  • Only One Name: For the first three books, her surname isn't revealed at all. It's revealed she doesn't reveal it to just anyone.
  • Reasonable Authority Figure: Unlike Octavian, she's willing to listen to our heroes, and seems okay with negotiating for peace between the Greeks and Romans — until a possessed Leo fires on Camp Jupiter. Still, because of her tentative friendship with Annabeth, she doesn't skewer the protagonists on the spot, instead letting them proceed with their mission.
  • Romantic Runner-Up: Jason gets together with Piper instead of her, and although she doesn't openly bring it up, it's obvious she's not very happy about it.
  • Ruling Couple: She points out it might have happened with Jason if he stayed, then offers this to Percy.
  • The Stoic: As a leader of Rome, being serious and unemotional is practically hardwired into her.
  • The Woman Wearing the Queenly Mask: Has been carrying the leadership of Camp Jupiter on her own for the past eight months and is struggling under the weight of both protecting everybody from the monster attacks and fending off Octavian’s attempts at seizing the other praetorship.

    Thalia Grace 

Thalia Grace

A daughter of Zeus, lieutenant of the Hunters of Artemis, and a returning character from Percy Jackson and the Olympians. 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.


    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 Number Two he finds ways to circumvent this.


  • Evil Chancellor: Seems to be acting as one to Reyna, as an active advocate of war against the Greeks. She quickly puts a stop to that. The moment she turns her back, he announces that they're changing their plans.
  • Evil Counterpart: 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.
  • Fortune Teller: An augur, specifically, and using his insight into the future to twist Camp Jupiter politics to his advantage.
  • General Ripper: Has this relationship towards the Greeks.
  • Meaningful Name: Shares quite a few personality traits with the original Octavian, including ambition and being a smooth talker.
  • Number Two: The augur is right below the two praetors in the chain of command, unfortunately.
  • Prophecies Rhyme All the Time: In a series that mostly plays this straight, Octavian lampshades it by demanding that the prophecy Mars gives be cryptic and vague. Mars pulls out a grenade.
  • Seer: Guts teddy bears to see the future.
  • The Starscream: To Reyna
  • Trojan Horse: Invokes it when he advises the Romans to "beware of Greeks bearing gifts. Subverted, since that wasn't the plan to begin with.
  • War Hawk: Is the most vocal in Camp Jupiter about going to war against the Greek demigods, 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.
  • Well-Intentioned Extremist: Jury's still out on whether he’s this or just a power hungry bastard.

     Minor Demigods 

Will Solace

A son of Apollo. Returning character from Percy Jackson and the Olympians.

Clovis

A son of Hypnos.

  • Animal Motifs: He's described as looking like a baby cow.
  • Asleep for Days: Because of being a child of the god of sleep.
  • Butt Monkey: 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. Twenty.
  • Heavy Sleeper: See above.
  • Running Gag: Constantly falling asleep.

Butch

A son of Iris.

  • Ambiguously Gay: He has a rainbow tattoo. While this is obviously intended to be a tribute to his mother the goddess of rainbows, it could also be something else given that practically everyone on Greek mythology was at least bi and the revelation of Nico's feelings for Percy.

Drew Tanaka

A daughter of Aphrodite and also former head counselor of her cabin. She also appeared in The Serpent's Shadow.

  • Alpha Bitch: She fits the general trademarks: snotty, beautiful (she is one of Aphrodite's daughters, after all), and always gets her way. Until the end of The Lost Hero, where Piper kicks her out of the role as head counselor of the Aphrodite cabin.
  • Asian Airhead: She isn't the sharpest tool in the shed, to say the least.
  • Bitch in Sheep's Clothing: Acts nice, but it's a only a front for her rather nasty personality.
  • Charm Person/Jedi Mind Trick/Compelling Voice: She and Piper are the only known demigods capable of charmspeaking as of now.
  • Evil Counterpart/Shadow Archetype: 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.
  • Gender-Blender Name: A female camper named Drew.
  • Girl Posse: Outside of camp, she has one at her school in The Serpent's Shadow of The Kane Chronicles.
  • Jerkass: She deliberately antagonizes everyone who isn't on her side.
  • Popular Is Dumb: Drew is the Alpha Bitch at camp, but doesn't have the smarts to back it up.
  • The Rival: To Piper.

Mitchell

Lacy

Hylla

Reyna's sister, and the Queen of the Amazons. Returning character from Percy Jackson and the Olympians, albeit a bit part.

Halcyon Green

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

  • Badass Grandpa: He's old, but is still veritably useful in a fight.
  • Heroic Sacrifice: To let Thalia and Luke escape his mansion.
  • In-Series Nickname: "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.
  • Tragic Keepsake: 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.

Dakota

Son of Bacchus, senior centurion of the Fifth Cohort.

  • The Alcoholic: 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.
  • Trademark Favorite Food: Red Kool-Aid.

Luke Castellan

A deceased son of Hermes, from Percy Jackson and the Olympians..

  • Hero of Another Story: The other story being the previous series.
  • Not So Different: Percy recognizes this when he relates his feelings of resentment to Luke's in the third book.
  • Posthumous Character: He died in the last book of the previous series, but he is still remembered and mentioned by other characters.

Other Allies

Other allies of the Seven.

    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.


  • Ascended Extra: He was mentioned by Grover in a one-liner in The Last Olympian, and is now a major supporting character.
  • Badass: Knocked out Keto, a primordial goddess, with a kick to the back of the head in Mark of Athena.
  • Blood Knight: He...loves violence. He wasn't bothered that Leo attacked New Rome since it meant fighting.
  • Extreme Omnivore: He'll eat anything, like most satyrs.
  • Fauns and Satyrs: He's a satyr.
  • Fearless Fool: He acts like this, being excited to fight even if the odds of winning are next to none because it means violence.
  • Happily Married: He and Mellie got married before the Argo II departed.
  • Hidden Depths: All the Badass Blood Knight tropes are his characterization from the first three books. In book four, 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.
  • Large Ham: Hedge is very loud and flamboyant with his actions.
  • Leeroy Jenkins: He's...very eager to go into battle, even if who they're fighting is a potential ally.
  • I Let My Mother Die: Revealed in The House Of Hades that 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 an 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.
  • Interspecies Romance: With Mellie, an air nymph.
  • Noodle Incident: Apparently has nightmares about 101 Dalmatians.
  • Official Couple: With Mellie.
  • Papa Wolf: He is terrified that 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.
  • Team Dad: He's gruff, stern, and attempts to keep the Seven in line in his own way. He's also prone to grounding them.
  • Would Hit a Girl: In Mark of Athena, he knocks out Keto, an ocean deity, with a kick to the head.

    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.


  • Living Ship: Seems sentient. 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.
  • Only Mostly Dead: 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.
  • Our Dragons Are Different: A robotic one.
  • Team Pet: Jason, Piper, and Leo see him as one.
  • Transforming Mecha: Can fold into a suitcase-sized box for convenience.

    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.

  • Motor Mouth: Ella is constantly talking about the things she's read.
  • Photographic Memory: A variation, with books. Ella can remember everything she reads — just not always when you need it.
  • Red Is Heroic: The only red-feathered, as well as nice, harpy seen so far.
  • Ship Tease: With Tyson.

    Arion 

Arion

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

  • Cluster F-Bomb: According to Percy, Arion has a pretty filthy mouth.
  • Cool Horse: The son of two Olympians, and as a result can "run like the wind over land and sea."
  • Eat Dirt Cheap: Arion eats gold.
  • Jerkass: "I will trample you to death, silly Chinese Canadian baby man!"
  • Tactful Translation: 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.
  • Sir Swears-a-Lot: According to Percy.
  • Smug Speedster: He has an ego to match his top speed.
  • Super Speed: 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.

    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.


  • Almighty Janitor: Literally — he's a Titan, but doesn't remember this and works as a janitor for Hades instead.
  • Amnesiacs Are Innocent: He acts very childlike and innocent.
  • Anti-Villain: 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 he seemed more happy to rise above his former self in The House of Hades.
  • Appropriated Appellation: "I am Bob. I choose to be more than Iapetus."
  • Ascended Extra: He only appeared in a side story to the original series...
  • Because You Were Nice to Me: 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.
  • Four-Temperament Ensemble: With the other Titans. He's the resident Phlegmatic.
  • Heel-Face Brainwashing: Due to his dip in the Lethe in The Sword of Hades, Bob's a lot nicer than your average Titan.
    • Heel-Face Turn: When he learns of his past as Iapetus, he initially experiences misgivings toward Percy, but ultimately decides to continue assisting them after Percy apologizes.
  • Heroic Sacrifice: 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: But only as Iapetus.
  • Kindhearted Cat Lover: Adopts a skeletal kitten and names it "Small Bob."
  • Laser-Guided Amnesia: A fight with Percy, Thalia, and Nico ended with Iapetus getting Lethe river water splashed on his face.
  • Messy Hair: Described as Einstein-like.

    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 Percy Jackson and the Olympians.

    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.


  • Arch-Enemy: Designed to be one to Ares. Didn't quite work out that way.
  • Antagonistic Offspring: To Gaea and Tartarus.
  • The Beastmaster: 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.
  • Big Damn Heroes: Appears during the fight with Tartarus to help Bob hold him off.
  • Dragon Rider: During his Big Damn Heroes moment.
  • Cynicism Catalyst: Inverted. Seeing the formerly brutal Iapetus rebel against Gaea convinced him that he, too, could change his fate.
  • The Exile: Trapped in Tartarus for an eternity.
  • Fate Worse than Death: Exiled in Tartarus for thousands and thousands of years, forever locked in combat with the Maeonian Drakon.
  • Hair Decorations: Like the other Giants, but instead of trophies of war, he has grass, leaves and flowers braided in it, reflecting his peaceful nature.
  • Heroic Sacrifice: Takes on Tartarus to buy Annabeth and Percy time to escape.
  • Let's Get Dangerous: Delivers an awesome speech to this effect whilst battling Tartarus.
    Damasen: 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!
  • The Medic: Cures Percy of gorgon-blood poisoning.
  • Nice Guy: Because Ares was such a Blood Knight, Damasen ended up being this. His temperament seems to have soured somewhat in the present day, but really, can you blame him?
  • No Good Deed Goes Unpunished: For ending the Drakon's rampage through Maeonia (present-day Turkey), he was exiled to Tartarus.
  • Red Is Heroic: Has rust-colored hair and cherry-red skin.
  • Token Good Teammate: To the Giants.
  • You Can't Fight Fate: Initially a believer in this, but Percy and Annabeth change his mind.
  • You Shall Not Pass: Against Tartarus, allowing Percy and Annabeth to escape through the Doors of Death.

    Other Allies 

Lupa

Trainer of Roman heroes.

  • A Dog Named Dog: Her name is the Latin word for "she-wolf".
  • Good Is Not Nice: She's very gruff and stern, and passes this on to her proteges.
  • Noble Wolf: Heroic but not nice.
  • Sink or Swim Mentor: 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.

Grover Underwood

A Protector. He's a close satyr friend of Annabeth and Percy and a member of the satyr council. Returning character from Percy Jackson and the Olympians.

Chiron

Trainer of Greek heroes. Returning character from Percy Jackson and the Olympians.

  • Demoted to Extra: He's a major character in the previous series, but in this one, he appears only in The Lost Hero.
  • Mr. Exposition: Brings Piper, Jason, and Leo up to speed with their heritage and current events.

Mellie

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

Gods

The Classical Mythology pantheon, featuring more gods than it did last time. As a note, names are written in this form: Greek Name/Roman Name.

    General 

  • Alternative Character Interpretation: The Roman aspects are this In-Universe — the Romans saw the gods differently than the Greeks did, after all.
  • Antagonistic Offspring: Most of them (except for the extremely primordial ones) to Kronos, then to Gaea.
  • Ascended Extra: Many of the minor gods, who were just offhand mentions or nonexistent in the previous series, play large roles this time.
  • Broke Your Arm Punching Out the Titans: 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.
  • Demoted to Extra: Most of the major gods from the last series are laying low this time around, due to the chaos caused by their split personalities.
  • Jerkass Gods: As bad, if not worse, than before. A few, like Iris and Thanatos, are exceptions, however.
  • Have You Seen My God?: Olympus is closed and the gods have gone MIA per Zeus's orders.
  • Inhumanly Beautiful Race: Unless otherwise stated (like in Akhlys's case), or if the narration says they cross into Uncanny Valley despite their beauty, you can expect a god's preferred form will be extremely easy on the eyes.
  • Really 700 Years Old / Time Abyss: They've been around since before the fall of the Titans, as they represent humanity's concepts.
  • Split Personality: 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.
  • Voluntary Shapeshifting: The gods can take any form they want.

    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 Percy Jackson and the Olympians.

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.


  • Ascended Extra: She's a secondary character at best in the previous series, but is much more important in this one.
  • Babysitter from Hell/Magical Nanny: For Leo.
  • Character Development: 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 Patron Saint, 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.
  • The Chessmaster: She's been putting her pieces into place for over seventeen years.
  • Damsel in Distress: 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.
  • Gambit Roulette: 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.
  • Patron Saint: For Jason. And of Rome in general.
  • Only Sane Goddess: 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.
  • Run or Die: 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.
  • Queen Incognito: Juno briefly pretends to be an old hippie lady dressed in trash bags when she dishes out her Sadistic Choice to Percy. She drops the act once they make it to Camp Jupiter.
  • Teeth-Clenched Teamwork: 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.
  • Wicked Stepmother: To all children of Zeus/Jupiter, but startlingly inverted towards Jason. This could either be a bit of Character Development or or even Alternative Character Interpretation, or Hera just trying to save her hide: 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 Percy Jackson and the Olympians. 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.


  • Blood Knight: Subverted as Mars. He’s not about endless bloodshed without resolution.
  • Character Development: Gets some in Son of Neptune.
    • Justified, considering that Mars is held in much higher regards to the Romans than Ares to the Greeks (the Spartans are an exception).
  • Colonel Badass: Mars's preferred form.
  • Doting Parent: Compared to how Ares treated Clarisse, his Roman counterpart nearly rivals Poseidon.
  • Hidden Depths: One might expect that a war god is nothing but a brutal Blood Knight, but Mars is actually very smart and kind of nice.
  • Obfuscating Stupidity: Pretends to not remember who Percy is in front of the Romans even though Frank can tell he’s lying.
  • Pet the Dog: Keeps Grandmother Zhang company while she’s waiting for Frank to come home one last time.
  • So Proud of You: 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.
  • Vitriolic Best Buds: 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 Percy Jackson and the Olympians.

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  and for stealing her statue, the Athena Parthenos. When she appears, she is Revenge Before Reason incarnate, saying that the Romans must die for the disgrace.


  • Abusive Parents: Not normally, but in Mark of Athena, she shows an incredibly nasty side towards her daughter.
    • 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.
  • Chickification: In-Universe. 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.
  • Disproportionate Retribution: 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.
  • Entitled Bitch: Her conversation with Annabeth was just straight up emotional abuse.
  • It's All About Me: 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. As it turns out, it could be crucial to keeping the peace between the camps.
  • Lady of War: Greek only. This is a major reason for her Disproportionate Retribution.
  • Reasonable Authority Figure: 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.
  • Revenge Before Reason: To the Romans. Percy's scared of her because this is usually inverted.
  • Sore Loser: Is seen as this by Arachne, although whether or not she actually was one at the time is...confusing.

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 Percy Jackson and the Olympians.

Aphrodite is seemingly unaffected by the Split Personality 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.


  • Amazingly Embarrassing Parents: For Piper in The Mark of Athena, where she goes on about romance in front of her, Annabeth, and Hazel.
  • Appearance Is in the Eye of the Beholder/Empathic Shapeshifter: As in the previous series, her appearance depends on the viewer's perception of ideal beauty.
  • Love Freak: Unsurprisingly, she's very passionate about her domain.
  • Love God: One of the most famous examples.
    • Hot God: Naturally, as she modifies her appearance to fit the viewer's perception of ideal beauty.
  • Proud Beauty: She's very proud of her attractiveness.
  • Shipper on Deck: 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...
  • Split Personality: 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 Percy Jackson and the Olympians.


  • The Alcoholic: Although as mentioned in the previous series, he's forcibly off the bottle. Bacchus drinks Diet Pepsi instead (versus Dionysus, who drinks Diet Coke).
  • Demoted to Extra: His Greek form, who was previously the Supporting Leader 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.
  • Miles Gloriosus: 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.

    Wind Gods 

The various winds.

Aeolus

King of the winds, weatherman of Olympus.

  • Ascended Extra: Was mentioned in The Last Olympian as the one defending the skies of Olympus.
  • Blow You Away: 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.

Boreas / Aquilo

The North Wind.

  • Affably Evil: Definitely not the most antagonistic of the gods, but there's a clear undercurrent of cruel excitement in his discourse with Piper and Jason.
  • Arch-Enemy: To Notus.
  • Canada, Eh?: He and his family live in Quebec, Canada.
  • Face-Heel Turn: 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.
  • French Jerk: Of the French-Canadian variety, actually.
  • An Ice Person: Because he lives in Canada, he is far colder.
  • Unwitting Pawn: To Khione.

Khione

Boreas's daughter, the goddess of snow.

  • An Ice Person: Displays the greatest prowess in this among the North Winds.
  • Manipulative Bitch: Oh, so very much. By the fourth book, she's successfully played Zeus, Hera, and Aeolus for chumps, and convinced Boreas and her brothers to serve Gaea.
  • The Mole: For Gaea among the wind gods.
  • Spanner in the Works: 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.
  • Underestimating Badassery: Shouldn't've dismissed Piper so easily, huh?
  • Winter Royal Lady: The goddess of snow.
  • Woman in White: Wears a white silk gown.

The Boreads

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

  • Back for the Dead: Though they can't technically die, their second appearance sees them soundly whupped by Piper.
  • Hulk Speak: 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.
  • Villainous Crush: Zethes makes it rather obvious that he's interested in Piper.
  • White Hair, Black Heart: Both have stark white hair.

Notus/Auster

The South Wind.

  • Arch-Enemy: To Boreas.
  • Brick Joke: 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.

Zephyros/Favionus

The West Wind, a servant of Cupid.

  • If I Can't Have You: Was in love with 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.
  • Mysterious Stranger: With a bit of The Watcher, he says that he's been watching Nico for years, knowing that one day he'd have to return to Split and face Cupid.
  • Winged Humanoid: His preferred form has two large wings.

    Other Gods 

Thanatos

The god of death.

Terminus

The Roman god of boundaries.

  • Barrier Warrior: He’s the last line of defense for New Rome.
  • Berserk Button: When people don’t follow rules, Terminus gets very, very angry. Also, do not contradict his belief that his statue has arms.
  • Butt Monkey: People like to crack jokes at his expense.
  • Chekhov's Gunman: Just there for comedy relief? Think again.
    Percy: ''(to Polybotes) This is Terminus. He's a god. *WHAM*
  • The Comically Serious

Iris

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.

Nemesis

Goddess of Revenge.

  • Appearance Is in the Eye of the Beholder/Empathic Shapeshifter: 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 Stern Teacher.
  • Death by Irony: A fan of inflicting it. Ask Narcissus...as soon as he stops looking into his mirror.
  • Equivalent Exchange: 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.
    • Leo uses her offer to save Hazel and Frank's lives... which comes at the cost of trapping Percy and Annabeth in Tartarus.
  • Split Personality: 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 Cool Sword.

  • Berserk Button: The very mention of Hera will piss him off. 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.
  • Cool Sword: He owned Riptide before Percy.
  • Revenge Before Reason: 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.
  • Super Strength: His most famous trait.
  • Walking Shirtless Scene: Played for laughs; in the past he was apparently naked so much that the dwarves who stole from him called him "Black Bottom."
  • Who Wants to Live Forever?: His immortality means he will never forget the deaths of his first family during his labors and his second one.

Hecate

Goddess of magic and crossroads.

  • Ascended Extra: Only gets a few mentions in the previous series, but plays an important role in Son of Magic and The House of Hades.
  • Canine Companion: Apparently, she turned Hecuba, the former Queen of Troy, into a Labrador.
  • Heel-Face Revolving Door: 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.
  • Jedi Mind Trick: Notable for being the best Mist manipulator the series has seen so far, due to it being part of her powers.
  • Lady of Black Magic: Ur Example.
  • Looks Like Cesare: Beautiful, but deathly pale. Hazel compares her to a dead body.
  • Neutral Female: In Son of Magic (a short story in the Demigod Diaries), she stays out of Alabaster's fight against Lamia, and only intervenes when he's about to trap Lamia in her own sand. Justified; she's a god and both Alabaster and Lamia are her children, so she can't play favorites.
  • Two Roads Before You/At the Crossroads: Hecate is the goddess of crossroads, and as such can predict possible outcomes each choice will lead into. 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.
  • Uh-Oh Eyes: Hazel describes them as black and creepy; although Hecate asserts that she isn't evil, magic, her domain, is merely a tool.
  • You Remind Me of X: Tells Hazel that she's a lot like her mother.

Akhlys

Goddess of Misery. A resident of Tartarus.

  • The Eeyore: As the goddess of misery she's always miserable and self-pitying.
  • Master Poisoner: She's also the goddess of poisons, and fittingly has an extensive knowledge of poisonous plants.
  • Nightmare Face: Her face is described as horrifying and ugly.
  • Required Secondary Powers: 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.

  • Adaptational Badass: 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 and manages to drag out a Nico's suppressed feelings about Percy.
  • Combat Pragmatist: Fights Jason and Nico while invisible. As he himself has said, love isn't fair and doesn't fight fair either.
  • Happily Married: To Psyche, as per mythos.
  • Love Hurts: As the personification of love, he seems to take a dry delight in this trope.
    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.
  • Man in White: He wears a white suit which only contributes to his harsh beauty.
  • Pretty Boy: Jason notes that Eros is beautiful and harsh, like it's difficult to look directly at him.
  • Small Role, Big Impact: He only shows up in one chapter, but what he does in that chapter (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.
  • True Neutral: 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."
  • Winged Humanoid: His preferred form has a pair of wings.

Nyx/Nox

Goddess of Night.

Tiberinus and Rhea Silvia

Triptolemus

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

Gaea's Forces

    Gaea 

The goddess of the Earth and progenitor of the Titans and, by extension, the Olympians. She's the main antagonist now.

  • Affably Evil: She maintains a calm and polite air at all times, even when taunting heroes and all but outright saying she wants them dead.
  • Big Bad: Of the series.
  • The Chessmaster: Seems to have planned out or predicted an awful lot of characters' choices prior to the beginning of the story.
  • Dishing Out Dirt: She is the Earth.
  • The Dreaded: Everybody's scared of her. She is, after all, the earth.
  • Eldritch Abomination/Humanoid Abomination: Seeing as her body is the entire planet.
  • The End of the World as We Know It: 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.
  • Evil Matriarch: The mother of all the gods and monsters except for the 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 Big Bad.
  • Gaia's Vengeance: Although she's not directly taking it out on mortals. Like in the original mythology, she does not have nature-based powers (this was the domain of Pan).
  • The Man Behind the Man: In the first book, behind her son Porphyrion.
  • Manipulative Bastard: 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.
  • Non-Action Big Bad: Because she's asleep, she pulls strings to get what she wants rather than directly doing things herself.
  • Parental Favoritism: Very blatantly favored the giants over the Titans.
  • Significant Birthdate: Invoked. She chooses August 1, the Feast of the Goddess of Hope, to begin the second Gigantomachy.

    Tartarus 

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

  • Archnemesis Dad: To Damasen.
  • Big Bad Duumvirate/The Dragon: 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.
  • Body Horror: The entirety of Tartarus is his body. This is given nods throughout the book as Percy and Annabeth joke about how they're traversing across different parts of his anatomy.
  • Dark Is Evil: Oh, you had better believe it!
  • Disproportionate Retribution: Destroys Krios and Hyperion for the former describing him in an unflattering manner.
  • The Dreaded: For very good reason. It takes a You Shall Not Pass 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?
  • Eldritch Abomination/Eldritch Location: The realm of Tartarus is his body, and when he assumes a form to deal with them personally Percy and Annabeth have a hard time looking directly at him.
  • Fighting a Shadow: 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.
  • Genius Loci: Tartarus' body is pretty much the Greek version of Hell.
  • Kick the Dog/Kick the Son of a Bitch: We probably weren't supposed to feel bad for Hyperion and Krios, but his reason for doing what he did to them just makes it callous.
  • Knight of Cerebus: Twofold. 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.
  • Mighty Glacier: Is slow but immensely powerful, due to never having taken on a humanoid form before.
  • Offing the Offspring: Presumably did this to Damasen and Bob.
  • Unskilled, but Strong: 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.
  • Womb Level: The realm of Tartatus is his body.

     Giants 

General

  • Arch-Enemy: Each one was designed to destroy a specific god.
  • Eviler than Thou: 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.
  • Evil Knockoff: Of the Olympians
  • Gaia's Vengeance: They are it.
  • Implacable Man: 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.
  • Our Giants Are Bigger: The average giant or giant-sized monsters are around 10-12 feet tall. These giants are around 20 feet or more.

Porphyrion

The most powerful of the giants and their king. Deigned to be a direct counter to Zeus including power.
  • The Dragon: To Gaea.
  • Hair Decorations: Like most Giants. His "decorations" of choice are weapons (implied to be those of past enemies).

Alcyoneus

Counterpart to Pluto and the eldest of the Giants.

  • Arch-Enemy: To Hades. Also to Hazel, seeing as she was the one who resurrected him.
  • The Dragon / Number Two: To Gaea, spanning the time period from the forties to Porphyrion's rise.
  • The Heavy: Of The Son of Neptune.
  • Made of Indestructium/Nigh-Invulnerability: Except if he's out of his homeland Alaska.
  • Too Dumb to Live: 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.

  • Evil Genius: 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.
  • Flunky Boss: He's aided in his fight against Jason, Piper, and Leo by several Earthborn.
  • Hair Decorations: He has bones braided into his hair.
  • I Have Your Father: Takes Tristan McLean hostage to force Piper's allegiance.

Polybotes

Counterpart to Poseidon.

  • Arch-Enemy: To Poseidon.
  • The Brute: Powerful for sure, but clearly not the most cunning of the giants.
  • Hair Decorations: He has live basilisks slithering in his hair.
  • Informed Ability: 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 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.
  • Poisonous Person: His very touch turns water to poison.
  • Prongs of Poseidon: Simultaneously the of the and the evil variety.

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.

  • Anti-Magic: His Shroud of Darkness neutralizes the mist.
  • Arch-Enemy: To Hecate.
  • Black Cloak: One made out of smoke because, you know, Evil Wears Black.
  • Evil Sounds Deep: Described as sounding like a bass guitar.
  • Hair Decorations: An aversion among giants; he has no special decorations. The only unusual thing is that the braids appear to be made of smoke.
  • Kill It with Fire: The one way to defeat him is with magical fire.
  • People Puppets: Controls Annabeth, Percy and Leo (and even corpses in the tombs of the Necromanteion) and uses their mouths to speak for him.
  • Super Smoke: Controls smoke that absorbs all Mist and magic. It also is used to steal people's voices and drain their life force.
  • The Quiet One: Out of all the Giants, Clytius rarely speaks.
  • Voice for the Voiceless: Doesn't use his own mouth, rather he steals people's vocal cords and communicates using their mouths.

Otis & Ephialtes

Counterparts to Dionysus.

    Titans 

Hyperion

Titan of Light and Lord of the East. Recurring character from Percy Jackson and the Olympians.

  • And I Must Scream: Gets his essence sucked into Tartarus' maw along with Krios when the the latter speaks ill of him.

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 The Doors of Death with Hyperion.

  • And I Must Scream: For his careless (though accurate) description of Tartarus, the Dark God shreds him and Hyperion with an energy blast and consumes their essence.

Koios

Titan of Foresight and Lord of the North.

  • BFS: His sword is the size of a surfboard.

    Other Servants 

Medea

Princess of Colchis, department store manager.

Midas and Lit

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

Khione

See the "Wind Gods" folder above.

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.

Eidolons

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

  • And I Must Scream: The three we see in The Mark of Athena end up forever fused to the remains of several completely trashed Automatons. Yeah, payback's a...
  • Demonic Possession: Duh.

Chrysaor

The Golden Warrior. Son of Posiden and Medusa, brother of Pegasus and half-brother of Percy.
  • Attention Whore: He became a pirate for the attention since his brother got all the attention.
  • Badass: He beat Percy in a sword fight, who compared him to Ares.
  • Irony: He wants a bigger legend but the lack of information about him is what makes him so dangerous.
  • Screw This, I'm Outta Here!: His crew when Percy bluffed Mr. D was coming.
  • Wake-Up Call Boss: 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.

  • All Webbed Up: As a giant spider, this is part of her powers.
  • Arch-Enemy: She hates Athena.
  • Back for the Dead: 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.
  • Enigmatic Minion: 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.
  • Fatal Flaw: Like Annabeth, hers is Pride.
  • Final Boss: Of The Mark of Athena.
  • Pride: Her defining character trait.

Pasiphaë

Wife of Minos and mother of the Minotaur.

  • Nice Job Fixing It, Villain: Resurrecting the Labyrinth.
  • Small Role, Big Impact: Resurrects Daedalus's Labyrinth in her twenty-odd page appearance, inadverently providing the heroes with a way to get the Arthena Parthenos back to Camp Half-Blood.

Sciron

Son of Poseidon and bandit extraordinaire.

  • Fearsome Foot/Smelly Feet: 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.

Others

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

    Other Mythological Creatures 

Echo

A nymph who fell in love with Narcissus, and is doomed to always echo what she previously hears.
  • Hopeless Suitor: For Narcissus. She loves him, but he only loves himself.
  • Ironic Echo: Literally. She's been cursed by Hera for gossiping a lot to echo whatever she hears last.
  • Love Hurts: She's spending her second chance at life still trying to help Narcissus break from his curse. He pays no attention to her, and because of her curse she's almost invisible to everyone else.
  • Love Redeems: She's trying to do this for Narcissuss.

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. 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.

  • Bitch in Sheep's Clothing: 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. Comes to fruition when she shows her true nature as a monster who works for Gaea.
  • Cain and Abel: The Cain to Alabaster's Abel.
  • Even Evil Has Loved Ones: 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.
  • Freudian Excuse: 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.
  • Genki Girl: An elderly version, but she's quite enthusiastic and full of praise for Claymore after he's finished with the event. Subverted, however, when she's revealed to be a monster.
  • Mama Bear: 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.
  • Small Role, Big Impact: She only appears in a short story in The Demigod Diaries, but what she did before both Percy Jackson and the Olympians and The Heroes of Olympus even started — namely, giving monsters the power to sense demigods and track them down by their scent — is a big factor in the story.

     Mortals 

Rachel Elizabeth Dare

"We have to work together to defeat Gaea."

The Oracle of Delphi. Returning character from Percy Jackson and the Olympians.

Ms. Grace

Jason and Thalia's mother.

  • '80s Hair: Her description in the previous series includes that she had a "poofy hairdo".
  • Abusive Parents: 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 offering her son as a peace offering for an angry goddess, either.
  • The Alcoholic: She turned to drink later in life, which caused her rift with her daughter.
  • Missing Mom: To Thalia and Jason.
  • No Name Given/Unnamed Parent: The only one of the Seven's mortal parents to not be named.
  • Posthumous Character: She's dead by the story proper.
  • White-Dwarf Starlet: 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.

  • Distressed Dude/Parents in Distress: He's held hostage in The Lost Hero to blackmail his daughter.
  • Fake Nationality: In-universe, he never plays a Native American in any movie he's in, despite being Cherokee.
  • Hostage Situation/I Have Your Wife: Gaea kidnaps him so that Piper will do what she wants. It doesn't work.
  • Mind Wipe: Piper gives him a drink that erases his memory of the whole ordeal, even if it helped the two of them grow closer.
  • Parental Neglect: 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.
  • Parents as People: His difficulties juggling his job and his daughter, as well as his relative weak will compared to other characters, are given extensive focus.
  • Window Love: With Piper, after he loses his memory.
  • Weak-Willed: 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.

  • Abusive Parents: Became this when possessed by Gaea.
  • Be Careful What You Wish For: 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.
  • Demonic Possession: She often gets possessed by Gaea.
  • Dying as Yourself/Redemption Equals Death: Only came back to her normal self before dying with Hazel on the sinking island.
  • Fortune Teller: She was a con artist, although Hecate says she had magic of her own.
  • Missing Mom: To Hazel.
  • My God, What Have I Done?: 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.
  • Posthumous Character

Grandmother Zhang

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

  • Animorphism: Turns into a vulture after the family mansion burns down.

Emily Zhang

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

  • Action Mom: Not only did she serve on the front lines in Afghanistan, she could also turn into animals!
  • Animorphism: The Zhang gift.
  • Deceased Parents Are the Best: Frank remembers her fondly.
  • Doting Parent: When she was alive.
  • Heroic Sacrifice: She died in the war to save her fellow soldiers.
  • Lady of War: Described as being very calm and graceful, but an excellent fighter.
  • Love Will Lead You Back: 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.
  • Mama Bear: Figuratively and literally. She turned into a bear to protect her son from one.
  • Missing Mom: To Frank.
  • Posthumous Character: Deceased by the story proper.
  • The Squadette: Was one of the first female Canadians to serve on the frontlines during the war.

Esperanza Valdez

Leo's deceased mother.

  • Deceased Parents Are the Best: When Leo's not angsting about killing her with his fire powers, he remembers her fondly.
  • Doting Parent: As much as she could, when she was alive.
  • Meaningful Name: Her name means "hope".
  • Missing Mom: To Leo.
  • Plucky Girl: 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.
  • Posthumous Character: Deceased by the story proper.
  • Spicy Latina: Averted. She was described as being very warm and friendly, as well as satisfied with her living conditions as long as she had Leo.
  • Wrench Wench: Very talented with machines, which, perhaps unsurprisingly, attracted the attention of Hephaestus.
  • The Unfair Sex: Despite having a college degree in engineering, she was never able to get a serious job as a mechanic because she was a woman.

Jane

Tristan McLean's secretary, and the one who minds Piper when he's busy.

Sammy

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

  • The One That Got Away: To Hazel. According to Gaea, had she lived Hazel would have grown up to marry him.
  • Only Friend: To Hazel.
  • Only One Name: He's only known as Sammy, nothing more. Until The Mark of Athena, where it turns out his surname is "Valdez", same as Leo's.
  • Satellite Love Interest: Not much is known about him as a character other than being Hazel's First Love and Leo's great-grandfather.
  • Twofer Token Minority: Mexican-American, so he jokes that the St. Agnes School for Colored Children and Indians should have given him a double scholarship.
  • What Could Have Been: In-Universe: If Hazel had stayed in New Orleans, she would have grown up to marry Sammy.

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.

  • Awesomeness by Analysis: 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, or seems to. See Unwitting Pawn.
  • Badass Normal: Fights Lamia with just a 9mm pistol and Good Old Fisticuffs.
  • 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.
  • Heroic Sacrifice: Attacks Lamia one final time to give Alabaster time to escape.
  • Properly Paranoid: 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.
  • Spirit Advisor: After his death, Hecate makes him one for Alabaster.
  • Unfazed Everyman: 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.
  • Unwitting Pawn: After defeating Lamia, he goes off to find Alabaster, unaware that Lamia let him win and then followed him to the demigod's safe house.
  • Would Hit a Girl: Holds his own against Lamia and shows no qualms about beating her up while she keeps trying to regenerate.
  • You Remind Me of X: Hecate tells him that he reminds her and Alabaster of Alabaster's father.
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