Demigods: Main Characters (Percy Jackson) | Camp Half-Blood | Camp Jupiter
Gods: Major Gods | Minor Gods | Other Servants
Villains: Forces of Kronos | Forces of Gaia | Forces of Triumvirate Holdings
Others: Nature Spirits | Mortals | Monsters | Other | Demigods & Magicians
The forces of Kronos of the Percy Jackson and the Olympians series and companions like The Demigod Files and The Demigod Diaries. For the full list of characters, click here.
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Kronos/Saturn
Played by: Robert Knepper (films), Nick Boraine (Disney+ series)
The King of the Titans and suitably the most powerful. He has domain over time and harvest. He is also Percy Jackson's malevolent grandfather and arch nemesis.
- Abusive Parents: He literally ate his children as soon as they were born because it was foretold that he was destined to be overcome by his own sons.
- Adaptational Badass: Chiron warns that if Kronos manages to get back to full power, he will be so strong that Typhon would be akin to a school yard bully by comparison. While the mythological Kronos was certainly formidable, Typhon is usually considered a greater threat.
- Adaptational Villainy:
- His Roman aspect Saturn. While the historical Romans had a very positive view of him, believing him to be a wise ruler who brought mankind a golden age, Camp Jupiter indicates that he isn't viewed much better than his Greek counterpart here.
- In general; Greek myths described him ruling benevolently over humanity in a golden age, and who only turned evil later in his life. In these books, however, the whole "golden age" was just Kronos' propaganda and he really used humans as food and entertainment.
- Ancient Evil: Thousands of years old, in fact.
- And I Must Scream: He literally cannot die. The first time, he was chopped into bits and pitched into Tartarus. The second time, his consciousness exploded and was spread so thinly across the world that there's little hope of it reassembling.
- Arch-Enemy: The leader of the Titans and the overarching threat of the entire series as a whole, tearing apart the lives of multiple demigods in the grand scheme of things. Through he's the nemesis of far too many to list, he takes a particular interest in Percy Jackson, his descendant from Poseidon's side.
- Archnemesis Dad: To all of the 12 Olympians, particularly the Big Three themselves; Zeus, Poseidon, and Hades.
- Asskicking Leads to Leadership: Became King of the Titans through being the most powerful, being the one who killed his father in the original mythology.
- Batman Gambit: Allowing the Fleece to be returned to Camp Half-Blood so Thalia could be brought back to life, and he could count on her Fatal Flaw to sway her to his side so he could have a chance to control the Great Prophecy. It fails.
- Big Bad: Of the Percy Jackson and the Olympians series. His goal is to be resurrected, and the demigods and gods have to stop him because it would mean the fall of civilization.
- Big "NO!": Lets one lose when he's finally defeated.
- The Chessmaster: Manipulates people and events to further his goal of reforming and taking over the world.
- Complete Immortality: Like most divine beings in the series, Kronos simply cannot die. Period. Not even cutting him into numerous pieces will truly do the trick. That said, after his essence gets scattered across the world, other characters theorize that he might never regain consciousness, let alone physcial body.
- Composite Character: The book series makes the common mistake of morphing the Titan Cronus with the primordial god of time, Chronos. In the myths, they were two separate beings who did not share the same powers.
This is at least forgivable, since there is evidence that the Cronus and Chronos were often conflated even by the ancient Greeks. - Demonic Possession: Because Kronos never fully recovers from being mutilated, he can come into being only by possessing someone.
- Eldritch Abomination: Described as such.
- Expy: The book version of Kronos is an expy of Sauron from The Lord of the Rings. Both characters are ancient evils defeated thousands of years before the main Myth Arc in a manner that left them severely weakened to the point that they could barely manifest in a physical form again. The main plot revolves around their return and the disastrous consequences of their potential victory, and when they are finally defeated they are left in a state beyond And I Must Scream.
- Fate Worse than Death: Chopped into tiny pieces and spends millennia in agony in Tartarus while remaining very much alive. His second defeat is possibly even worse, with his consciousness spread so thin he has next to zero chance of becoming a sentient being again.
- Gruesome Grandparent: As the father of Poseidon, Kronos is Percy's grandfather. An evil Titan that wants to destroy Western civilization is, understandably, not someone you'd want to have as a grandpa.
- Jumped at the Call: Percy Jackson's Greek Gods says he was eager indeed when Gaea asked the Titans who will kill Ouranos.
- Karmic Death: The first time around. Given that this mythology version where Kronos chopped Ouranos into pieces rather than merely castrating him, Kronos suffers the exact same fate done with the exact same weapon he used.
- Lean and Mean: His original body is described as being far less impressive physically than his fellow Titans, but even back then he had an evil gleam in his eyes and was the only Titan who willing stepped up to the task of killing Ouranos.
- Our Titans Are Different: Percy Jackson's Greek Gods describes him as being nine feet tall in ancient times (apparently short for a titan). While trapped in Tartarus after his overthrow by Zeus, Kronos was able to speak to people in visions and dreams, tempting them to evil. This is how he was able to recruit Luke. He shows that in his imprisoned form he can take over people's bodies (but this is not an easy task for Kronos). Even while posessing a mortal's body he shows himself very capable in combat.
- Sadistic Choice: In the fifth book, Kronos frequently threatens to kill Percy's friends unless he surrenders to him.
- Satanic Archetype: Kronos sits imprisoned in Hellnote by the gods, but was still able to influence the world above by tempting people via dreams and visions. He has command over Hell's demonsnote and is able to possess people as he does in the attack on Olympus.
- Sealed Evil in a Can: Initially, his remains are just in a particularly creepy sarcophagus that gets stronger every time a demigod forsakes the Olympians and joins his side. Later, Luke graduates to being his Soul Jar.
- Sinister Scythe: His signature weapon. It spends most of the series reforged into Luke's sword Backbiter before getting reforged back into its old scythe form. As The Last Olympian shows, what makes it so dangerous is that the scythe is a Soul-Cutting Blade as Percy felt immense pain and deliriousness when merely grazed by the scythe. One hit from the scythe can "sever their soul from their body" with a single touch, according to the Telekhines.
- Stronger Sibling: Despite the Giants being hyped off as being stronger than the Titans as a whole, Kronos is easily Gaea's most dangerous, cunning and capable child.
- Time Master: Kronos seems particularly fond of slowing time around his opponents to a near stop. Percy Jackson's Greek Gods has Percy state that back when he was king of the titans, he liked to use his powers to speed up time for his victims, causing them to crumble to dust due to aging. (Notably, his powers do not, in fact, include Time Travel, despite being the Titan (and thus personification) of Time.)
- We Can Rule Together: Offers this a bunch of times. Most of them are insincere.
- Xanatos Gambit: A big one in the second book. He gets Luke to poison Thalia's tree, which protects Camp Half-Blood and can only be cured by the Golden Fleece. There are three possible outcomes for this plan, and all of them help Kronos in some way:
- The heroes fail to find the Fleece. Then the barrier is gone and Kronos' forces are free to raid Camp Half-Blood, killing many of his enemies.
- The heroes find the Fleece and then Luke steals it. Then he can use it to bring back Kronos, allowing him to destroy the Olympus and Western civilization.
- The heroes find the Fleece and Luke fails to steal it, so they bring it to Camp Half-Blood and cure the tree. Then they also accidentally resurrect Thalia, daughter of Zeus and another possible subject of the prophecy and so a possible pawn for Kronos other than Percy, making Kronos' win more likely.
- Thankfully, the last intended outcome doesn't work out as Kronos had hoped for when Thalia willingly joins the Hunters of Artemis the day before her 16th birthday, essentially removing herself from the Great Prophecy. He apparently never comprehended the notion since he's known of her past distaste for the Hunters.
- Yellow Eyes of Sneakiness: All the more identifiable considering that he possesses people to function. When he possesses Luke, for example, the latter's eyes turn from blue to gold.
- You Have Failed Me: Kronos decides to let Atlas rot due to his repeated failures.
Demigods
Luke Castellan
Played by: Jake Abel (films), Samuel Braun (young; films), Charlie Bushnell (TV series)
Son of Hermes and May Castellan. When he was an infant, his mother tried to become the new host for the Oracle of Delphi. It went horribly wrong. May went crazy from visions of her son's eventual future and became The Ophelia, and spent Luke's childhood babbling at him about his horrible fate. He ran away and met up with Thalia and Annabeth; they eventually made it to Camp Half-Blood, but not before Thalia died. Luke went on a failed quest and came back with a scar. He is a major villain in the first series, second only to Kronos, attempting to destroy the gods for their manipulation and abuse towards him.
- The Ace: Good looking, charismatic, a good fighter, and his cabin's counselor.
- Adaptational Dye-Job: He's blond in the books and films, but has black hair in the Disney+ series owing to Rick Riordan's preference of
Ability over Appearance. - Adaptational Villainy: In the books, Luke is an Anti-Villain who's committed several questionable actions against his former friends, but genuinely wanted to make things better for demigods who're unclaimed and related to minor gods (no cabin of their own parentage and/or ignored by them). As time went on, he began to question his loyalties with Kronos and ultimately redeems himself in his last minutes. In the films, however, he's a sadistic, power-hungry Jerkass who doesn't care for the well-being of demigods (not even his own comrades); just wanting to overthrow the gods and rule the world all because he's never seen his father and is willing to revive Kronos as a way to get back at him.
- Always Someone Better: To Percy.
- Anti-Villain: Gradually revealed to be this as the series goes on and his more redeeming qualities and tragic backstory come to the surface.
- Arch-Enemy: Luke is one of Percy's two arch enemies, alongside Kronos. After his defection, he and Percy are firmly embittered toward one another and Percy despises him for endangering so many and hurting Annabeth. It's then subverted as the animosity gradually abates once Kronos takes center stage and the circumstances that led to Luke turning come to light. Following his Heroic Sacrifice to stop the Crooked One, Percy decides to remember Luke for his good qualities while acknowledging he made terrible choices, and his death gives him the gumption to call out the gods for their terrible disregard for their children.
- Broken Ace: He was a handsome fighter and the cabin counselor, and by the time we meet him, he's jaded, unhappy, and desperately craves affection from his aloof father.
- Broken Bird: Rare Male Example. His hatred of the gods stems from his own bitterness after being basically abandoned by his father his entire life.
- Broken Pedestal: Percy looked up to Luke as a Big Brother Mentor, until he reveals his true nature and tries to kill him. In the last book, Percy regains some respect for Luke and honored his wishes to the gods to pay more attention to their children, especially children of the minor gods and giving them cabins of their own. However, Percy acknowledges that Luke still made bad choices that got his friends hurt and acted out no better than the gods themselves.
- Big Bad: He's effectively this for the first two books, as Kronos is at that point Sealed Evil in a Can and none of the higher-ranking Titans show up until the third. He's back to this for The Battle of the Labyrinth with the absence of any other higher-ranking villains, until he gets possessed by Kronos.
- Big Brother Mentor: To Percy in book one. Implied to have been one to Annabeth too.
- Big Man on Campus: Seemed to be this before betraying the camp — he was counselor of the Hermes cabin, attractive, relatively popular, and a Big Brother Mentor to Percy.
- Calling the Old Man Out: He's pretty pissed at Hermes for being absent from his life, to put it mildly.
- The Chosen One: Luke is "the hero" described in the Great Prophecy whose soul would be reaped, not Percy as everyone initially believed.
- Chronic Backstabbing Disorder: No matter how he claims otherwise, he keeps hurting Annabeth, the only camper he has protected up until his Face–Heel Turn. Including the time where he poisoned Thalia's tree, tricked Annabeth into taking the sky, and literally wounded her at the end of book five. He doesn't realize it until the last part.
- Cool Sword: Backbiter. Doubly deadly due being fashioned out of both Celestial Bronze and steel, meaning it can kill both mortals and gods.
- Crossing the Burnt Bridge: If you trick the kid that saw you as a big brother into risking her life for you multiple times, and used her as a hostage against her soon-to-be boyfriend, then the smart thing would be to apologize and make amends if you need her help. Except Luke doesn't, having the gall to go to Annabeth's house and merely beg her to run away with him before the final battle starts. Annabeth still has a white streak in her hair from holding up the sky, and told him to bug off.
- Crying Wolf: Before Kronos possessed him, he ran to Annabeth, begging her to run away with him... And this was after he tricked her into taking the sky, took her hostage and used her as bait to lure her friends into a trap. She obviously turned him down and it was probably the right decision at the time, because the boy cannot be trusted.
- Dark Messiah: Definitely twisted and evil as well as basically Kronos's champion, but eventually saves the world.
- Demonic Possession: Luke reluctantly allows Kronos to possess him as the last resort for Kronos's resurrection.
- Devious Daggers: Luke - the traitor to Camp Half-Blood and son of the God of Thieves - owned a dagger that he gifted to Annabeth years before. Ironically for the usual uses of this trope, Luke's use of this dagger in The Last Olympian was to defeat Kronos.
- The Dragon: Kronos' right-hand demigod and primary agent. He also serves this role to Atlas during The Titan's Curse.
- Driven to Suicide: For a good cause. See Heroic Sacrifice below.
- Driven to Villainy: His bitterness at his father and the treatment of those in the Hermes cabin drive him to betray the camp.
- Dying as Yourself: Luke ultimately ends the series going out as himself, not as Kronos' vessel.
- Face–Heel Turn: Goes from friendly, if somewhat aloof, mentor character to Percy to one of the major antagonists in the series. And back again, if only for a few moments.
- Fallen Hero: One of Camp Half-Blood's greatest demigods ends up throwing his lot in with Kronos out of hatred for the gods.
- Fantastic Racism: Shows great disdain for Cyclopes because getting kidnapped by one was the reason his best friend, Thalia, got killed. He even bashes at Annabeth for "dishonoring Thalia's memory" just for befriending Tyson. And there's not a single mention of a Cyclops ever recruited in Luke's Titan Army, likely due to this reason.
- Fatal Flaw: Excessive wrath. Luke was unable to forgive Hermes for what he'd been through, from having to run away from his mentally unstable mother at just nine-years-old to failing a pointless quest. Luke's anger blinded him so much that he turned against his closest friends, including Thalia and Annabeth. By the time he realized how much harm he's brought upon his friends, it was too late and Luke ended up sacrificing himself to stop Kronos.
- According to Thalia, Luke was also extremely reckless that only worsened after his first meeting with Hermes, which left him moody and desperate to prove himself. Thalia admits that the real reason why they had a lot of trouble getting to camp was because Luke kept wanting to pick a fight with every monster they crossed, which is also an indirect contribution to Thalia's death.
- Forgiven, but Not Forgotten: How the demigods treat Luke after his death. While Percy relishes that Luke died a hero's death by making the right choice in the end (and understood that his anger towards the gods were justified), Percy and everyone else acknowledges that Luke still made bad choices regardless and willingly hurt the ones who cared about him, especially his closest friends, Annabeth and Thalia, by breaking his promise he made them.
- Freudian Excuse: Once you find out his backstory in The Last Olympian, it's not hard to understand why he turned out the way her did. His mother suffered from insanity and his father is distant, driving him to run away from home when he was only nine.
- Freudian Excuse Is No Excuse: Percy calls Luke out for this in The Last Olympian. With Luke's backstory, any kid would be traumatized by their mother developing a bad mental illness to the point where they remain mired in delusion. But that was no excuse for what he did to the campers who trusted him, including Thalia, Percy and Annabeth. Luke made himself become as bad as the gods he opposed.
- From Nobody to Nightmare: Downplayed as he was a senior camper and the head counselor of his cabin, but Luke didn't have a glamorous life as far as half-bloods go. He ran away from his mentally insane mother at age 9, lived homeless for a while, and ended up counselor of the cabin for kids with unknown parentage. He even failed his first quest. But then Kronos started speaking to him in his dreams, and the rest is history.
- Good Scars, Evil Scars: He has a scar on the right side on his face that he got from the dragon guardian of the Garden of the Hesperides and as the series progresses, it becomes more prominent. Percy states it looks fresh by the last book, though it's never explained why.
- Half-Human Hybrid: His mother was mortal while Hermes is a god.
- The Heavy: For the first four books in the series until Kronos breaks free from his can and takes possession of Luke's body.
- He Who Fights Monsters: Started out on the good guys' side, but eventually his resentment against the Olympians drove him to Kronos's side. Percy eventually calls him out for how he may be right about how the gods treat their children, but Luke is only making their situation worse.
- Heroic Sacrifice: Stabs himself in the side to save Olympus.
- Heroic Willpower: Throws off Kronos' possession long enough to apologize to Annabeth and complete the above sacrifice.
- Honey Trap: For Silena; he seduced her and set her up as The Mole, a decision she later comes to regret.
- Hypocrite:
- Accuses the Olympians of their horrendous crimes, yet he sides with the Titans who are no different. Percy calls him out for hurting the campers as badly as the gods hurt or ignored them.
- Percy outright calls Luke a hypocrite for showing worry that Annabeth is fading from holding the sky, even though he was the one who baited Annabeth into taking in the first place.
- I Cannot Self-Terminate: A special case, in that he can self-terminate, he just needs Percy to give him a knife.
- Icy Blue Eyes: Percy describes them as "piercing."
- "I Know You Are in There Somewhere" Fight: With Annabeth during The Last Olympian.
- In Spite of a Nail: He and Percy are this to each other. They're both sweet, compassionate fighters who become highly admired by their colleagues. Both are proficient swordsmen, handsome, and both consider Annabeth to be one of the most important people in their lives. They even have similar narrative voices, as demonstrated by his first-person short story in The Demigod Diaries. The divergence hits with their mothers. Luke's mother was tragically driven insane when she attempted to channel the spirit of the Oracle of Delphi and spent most of his childhood babbling at him about his awful fate, leaving him scared, resentful, and starved for affection. His anger towards the gods was only increased by a quest that left him scarred and mostly ignored by the gods, including his father. He lashes out towards the manipulation by trying to unseat them and almost brings about the end of the world. By contrast, Percy is closer to his mother than anyone, and it's heavily implied she taught him everything he knows about kindness, morality, and love. Percy, too, was scared of his fate about the Great Prophecy, but learns to trust his friends and willingly accepts his fate until the time came to pass.
- Luke is a prime example of who Percy would've become if he had chose to give into resentment and despair over love and loyalty to his friends and family.
- Karmic Death: He chooses it, however; Luke is fighting an injured Percy and Annabeth in the climax, while Kronos is possessing him. As Annabeth falls, she reverts to her previous childish demeanor and reminded Luke he promised to never hurt her. Luke pauses, stunned, and gets a Heel Realization. He then stabs himself with Percy's knife, in his weak spot, before Kronos can stop him. As he's dying, Luke promises Annabeth that he'll reincarnate and try to be a better person.
- Kick the Dog: He framed Percy for stealing Zeus' Master Bolt and Hades' Helm of Darkness, even though Percy wasn't even aware he was a demigod at the time, and made the boy into his Unwitting Pawn. Even though Percy looked up to Luke as a Big Brother Mentor, he still tried to kill him with Pit Scorpion venom (only being lucky to have survived). Needless to say, Percy takes Luke's actions very personally, considering that his loved ones all nearly got killed because of him.
- Kick the Morality Pet: Tricking Annabeth – the closest thing he had to a sister – into taking the sky and then using her as bait was not one of his finest moments. Both Percy and Thalia were rightfully appalled by this.
- Knight Templar: Luke wants to take down the gods of Olympus for their unjust treatment of their children... and to do so, he's teamed up with someone far worse then them.
- Like Brother and Sister: With Annabeth, and Thalia to a degree. They're a little family for sure, but sometimes he and Thalia come off more as parent substitutes to their little girl. The fact that Luke forgets this and has hurt Annabeth multiple times, to the point where she gives up on him at two different points in The Last Olympian, is an important plot point.
- Living Bodysuit: To Kronos after the latter possesses him.
- Love Redeems: In the end, his love for Annabeth drove him to perform his Heroic Sacrifice.
- Luckily, My Shield Will Protect Me: Luke having a shield to defend himself with is a major factor in his victory against Percy in ''The Sea of Monsters".
- The Man Behind the Monsters: After joining Kronos, countless nasties from the depths of Tartarus started working for the twenty-something demigod Luke as the Titan King's top earthly servant.
- Meaningful Name: A castellan is the noble tasked with defending a castle. So who's the one who ultimately protects Olympus? And as noted on the main page, his name means "light" or "light-bringer". Which sounds pretty nice until you realize it means that because it's derived from Lucifer.
- Memorial for the Antagonist: When he dies, the first thing Percy does is request a proper burial, and Hermes even gives him a final blessing.
- Moral Myopia: He's angry about how the gods ignore their children and let them suffer. Then he starts causing some of the suffering, using campers as pawns the ways the gods do, and Luke justifies it. It's not the first or second time of nearly killing Annabeth, tricking her into "saving" him or using her as a hostage that made him realize he was too far gone. No, it was when he injured her while Kronos was possessing him that spurred his Heel Realization.
- My God, What Have I Done?: In The Last Olympian, when he realizes he's hurt Annabeth again and broken his promise to her. It's the last straw in a larger revelation about exactly how much damage his spitefulness has caused.
- Oxymoronic Being: His sword Backbiter, a specially made half-steel, half-celestial bronze blade that can kill both mortals and monsters. Percy describes it fighting against itself, like two opposing magnets stuck together. It's actually the "beta" form of Kronos' scythe, and has to be bathed in blood in order to fuse the metals together.
- Promotion to Parent: For Annabeth when they were on the run.
- Rage Against the Heavens: He wants to resurrect Kronos in order to destroy the gods.
- Redemption Equals Death: Kills himself in order to defeat Kronos, who his body has been jacked by, and save the world.
- Ship Tease: With Thalia in The Titan's Curse and The Diary of Luke Castellan.
- Soul Jar: For Kronos.
- Start of Darkness: The fight on Half-Blood Hill, when Thalia was killed as part of Hades' revenge for the death of Maria di Angelo, and Zeus "saved" her by turning her spirit into a tree. Luke didn't take the gods' version of mercy well.
- Supernatural Gold Eyes: When possessed by Kronos.
- Tragic Hero: He Used to Be a Sweet Kid, but his bitterness from being abandoned by his father Hermes drove him to betray his friends at Camp Half-Blood and plan to destroy the gods.
- Unreliable Illustrator: Luke's scar has been consistently described as being on the right side of his face, but in the first piece of official art we ever got for him
◊, it's inexplicably on his left. - The Unreveal: Given how long reincarnation takes, along with the sheer number of trials required to earn a spot in Elysium, Percy and Annabeth are unlikely to find out where Luke will be reborn when he says he'll choose that over the Underworld. Hades is also a grudgeholder, so he's not likely to give Luke an easy next life given Luke endangered his children, Bianca and Nico, and even stole his helm.
- Used to Be a Sweet Kid : Evident in his diary. He sounds a lot like Percy.
- The Vamp: Rare Male Example. Silena's confession in Olympian features Rick trying as hard as he can to play this trope without his editors coming down on him. She's the only person who explicitly accuses him of it, but given his penchant for straightforward manipulation, it's not out of the question that it was a regular strategy for him.
- Villain Has a Point: Luke despises the Olympians for being a bunch of psychopaths who use their children as slaves and sometimes outright neglecting them of their true heritage, and not even allowing children of minor gods to have their own cabins in camp. Given how cramping the Hermes Cabin was, Luke wasn't entirely wrong there. On the other hand, he believes that the gods must be exterminated, and that is where he's dead wrong; Dionysus explained near the end of The Last Olympian that the world needs the gods as much as the gods need help from their demigod children, whether they admit it or not.
- "Well Done, Son" Guy: "You said they cared about me!"
- Well-Intentioned Extremist: At the end of the day, his main motivation is a desire for the half-blood population to be acknowledged by their parents, instead of used as pawns and then pushed aside. Problem is, he thought resurrecting an Obviously Evil primordial entity was a valid social justice movement. By Heroes of Olympus, Percy fully understands and accepts why Luke went down the path he did and had a valid point that most of the gods tend to neglecte their children. And if Ethan Nakamura, a son of Nemesis, being crammed in the Hermes cabin is anything to go by, his godly parent had no cabin in camp, even if he was claimed.
- We Used to Be Friends: He was popular and well-liked in the camp before his turn to evil, and this dynamic is especially pronounced in his interactions with Thalia and Annabeth (with whom he shares history) and Percy (who saw him as a Big Brother Mentor).
- Willing Channeler: Kronos coerces him into submitting to possession.
- Woobie, Destroyer of Worlds: To the point when even the victims of his nefarious acts (Silena, Thalia, Annabeth) show compassion for him and want to help him. Even Percy, who outright yet justifiably resents him for endangering his life, feels bad for the guy in the end.
- Worthy Opponent: To Percy. It's mentioned that Luke is the only one who could match Percy's swordsmanship.
- Would Hurt a Child: Despite being seven years older than Percy and Annabeth, he had no qualms poisoning a twelve-year-old Percy with deadly Pit Scorpion venom (only being lucky to have survived). Then, he allowed his monsters to devour Annabeth alive twice while she was thirteen at the time, and then left her to bear the Titan's Curse alone in order to blackmail Artemis.
- You Can't Fight Fate: His parents have known since he was an infant what would happen to him. His mother's mad ravings about it and Hermes' refusal to elaborate were what drove Luke away from them.
Ethan Nakamura
Played by: Danny Le Boyer
Son of Nemesis, the goddess of revenge and balance, Ethan was one of the many residents of Cabin Eleven who went unclaimed or had no cabin of their own because their parents were minor gods. He promised his mother he would make a place on Olympus for the minor gods, and in exchange she took his eye.
- Anti-Villain: He doesn't desire anything for himself. Instead, he wants to elevate his mother and other minor gods to be on the same level as the Olympians, after being sick of seeing them getting sidelined all the time and receiving no respect from everyone. This is a very, very honorable goal, yet the heroes (including Percy), who are mostly children of the Olympians, are very slow to empathize or catch this up. The only thing that stops him from becoming a Designated Villain is that the side he currently works for, the Titans, are Always Chaotic Evil.
- Co-Dragons: He and Prometheus become this for Kronos after Hyperion's defeat.
- Disney Villain Death: After Ethan is mortally wounded in his failed attempt to kill Kronos, the titan opens a fissure in Olympus that his body falls into.
- Eyepatch of Power: Wears one to cover his missing eye.
- Eye Scream: His mother took his eye part of the promise that he would change Olympus for the better.
- Fallen Hero: As a former camper.
- Handicapped Badass: When he fights Percy in Battle of the Labyrinth, Percy attempts to take advantage of his lack of an eye by aiming more attacks at his left side. Presumably, Ethan has trained himself to compensate for this flaw since the tactic doesn't work.
- Heel–Face Revolving Door: Starts out as a hero, then turns to Kronos's side, then turns back to being a hero again at the last second in The Last Olympian, resulting in his death.
- Hoist by His Own Petard: When he tries to kill Kronos, Ethan's blade shatters and one of the pieces spears him.
- Ineffectual Sympathetic Villain: Every attempt he makes to oppose Percy end with him trounced and Kronos treats him like an annoyance half the time.
- I Just Want to Be Special: During a peace talk, he explains he turned against the gods and joined Kronos because he was tired of being considered a nobody at Camp Half-Blood for being the son of a minor goddess.Ethan: All I want is respect, Jackson. The gods never gave me that. You wanted me to go to your stupid camp, spend my time crammed into the Hermes cabin because I'm not important? Not even recognized?
- Jerkass Has a Point: He was an Ungrateful Bastard to Percy for saving his life, but Ethan points out that his mother, Nemesis, has no cabin at Camp Half-Blood because she's a minor goddess and "not important enough". Even if he had wanted to go back, claimed and all, he'd be forced to bunk in the extremely crammed Hermes cabin. This is one of the major factors that motivated Percy into calling the major gods out for not only neglecting their kids, but also disrespecting children of the minor gods and that they deserve their own cabins at camp.
- Master Swordsman: While he eventually loses, he fights evenly with Percy in The Battle of the Labyrinth and duels Annabeth in The Last Olympian.
- Mook Lieutenant: Kronos/Luke's main demigod subordinate during The Last Olympian.
- Pride Before a Fall: His mother is the goddess that causes the "fall" part of this trope. Ethan himself follows in her footsteps.
- Redemption Equals Death: In The Last Olympian, he changes sides at the last second when he realizes that Kronos doesn't build, only destroys, and tries to kill Kronos. Kronos, in turn, kills him for turning against him.
- Scales of Justice: Ethan Nakamura's burial shroud has a set of scales on it. This is because Nemesis is his mother.
- Small Role, Big Impact: While there are several other factors, Ethan's desperate goal to elevate his mother is basically what pushed Percy to campaign for the rights of the minor gods at the end of the The Last Olympian, something that is duly granted, thus granting 10 and more cabins to be constructed in Camp Half-Blood for The Heroes of Olympus series and beyond.
- Stealth Pun: He is blind in one eye. His goal is to bring justice for the minor gods. You could say... justice is blind. (Or, in this case, half blind.)
- Tarot Motifs: 8th/11th, Justice. The card shows a blindfolded woman holding a sword and scales. Ethan has one eye missing and his burial shroud is embroidered with crossed swords and a set of scales.
- Ungrateful Bastard: Despite Percy saving his life, Ethan pledges his loyalty to Kronos. This is the last demigod needed to resurrect Kronos.
Chris Rodriguez
One of Luke's allies and a fellow son of Hermes. For related tropes, see here.
Luke's Spy
Luke's spy among the ranks of Camp Half-Blood. For related tropes, see here.
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.
- Anti-Hero: An unrepentant soldier of Kronos and exile from Camp Half-Blood is a rather unlikely hero for one of Riordan's stories.
- Anti-Villain: In the first series, he was one of the demigods working for Kronos. His reasoning (much like the other demigods) was that he was mistreated just for being unclaimed (which he was).
- Armor-Piercing Question: After Claymore asks what happens when we die, Alabaster asks him why after all his research he doesn't know.
- BFS: According to Claymore, his sword must weigh a hundred pounds.
- Cain and Abel: The Abel to Lamia's Cain.
- Half-Human Hybrid: He's a demigod and his mother is the goddess of magic.
- Heel–Face Turn: In his debut story at least, he works with Claymore to defend against his murderous sister Lamia. Alabaster acknowledges that he made a bad choice in supporting Kronos's forces, and is working to make up for that.
- Never My Fault: His banishment was because he urged his mother to keep fighting against the Olympians and made it clear he wasn't going to submit, but he just blames Olympus along with Percy who had really nothing to do with it.
- Remember the New Guy?: Is stated to have been the leader of the demigods on Kronos' side, but was never mentioned in the original series. Admittedly only handful of the demigods with Kronos were actually named so there is some wiggle room, but Luke was the only one shown calling the shots.
- The Remnant: One of the few demigods on Luke's/Kronos' side who both survived and doesn't regret his service. Safe to say he's not a fan of the Olympians or Percy.
- Sore Loser: Still holds a major grudge against the Olympians for winning. Deconstructed as this resulted in his banishment.
- Unknown Rival: Hates Percy while Percy likely has no idea who he is.
- Unreliable Narrator: Downplayed. His account of the Titan War is generally accurate if colored by his personal biases.
- Welcome Back, Traitor: Averted, as he can't go back to Camp Half-Blood.
Titans
Atlas
- And I Must Scream: Has been holding up the sky for a very, very long time.
- Archnemesis Dad: To Zoë.
- Arc Villain: Of The Titan's Curse.
- The Brute: Is the most physically strong of the Titans.
- The Dragon: Kronos' right-hand Titan and greatest warrior. He gets demoted and replaced by Hyperion after his failure in the third book.
- Evil Sounds Deep: His voice is described as being very, very deep.
- Genius Bruiser: Despite being the Brute, he also is shown to be quite intelligent and a fairly good manipulator.
- Humans Are the Real Monsters: The reason he likes to recruit mortals; he feels like they are easy to corrupt, and as such make for good minions.
- Knight of Cerebus: The fight with him is the first one in the series where a questmate dies.
- Large and in Charge: The General of Kronos' troops, and described as incredibly tall and large.
- Offing the Offspring: Does this to Zoë.
- Sealed Evil in a Can: The sky itself is a fairly potent prison.
- You Have Failed Me: On the receiving end of this. For his failure, Kronos opts not to free him from having to hold up the sky again.
Hyperion
- Buried Alive: How he is defeated in The Last Olympian.
- Cessation of Existence: Tartarus absorbs his and Krios' essences in The House of Hades.
- The Dragon: Second-in-command to Kronos, is the only one fighting in the Battle of Manhattan with him, and is the second most powerful.
- Elemental Powers: He has fire and light powers.
- God of Light: Well, Titan of Light, but still.
- Light Is Not Good: The Titan of Light (and uses light and fire-based powers), but very evil.
- The Power of the Sun: As the Titan of Light.
Krios
The Titan of Stars and Constellations.
- Butt-Monkey: He thinks of himself this way.
- Cessation of Existence: Absorbed by Tartarus in The House of Hades.
- Horns of Villainy: His helmet has a set of ram horns. He thinks they look stupid and privately grumbles about it.
- The Resenter: To the other Titans.
- Star Power: Though the extent of his power is not known, since his battles are never described.
- Villain of Another Story: The Lost Hero reveals he was off defending Mount Othrys from the Romans.
- What Happened to the Mouse?: Before The Heroes of Olympus series is released, his fate is left hanging, as he is the only Titan to be introduced but not be faced by the heroes. The Lost Hero clears this up right away by Jason claiming that he personally defeated Krios while the Romans were attacking Mount Othrys.
Oceanus
The Titan of Oceans.
- Adaptational Villainy: In the original myths, he one of the few Titans (other than Prometheus and his brother) explicitly stated not to take part in the Titanomachy. Poseidon takes notice of this and states this only proves how bad things really are, as Oceanus wouldn't have joined forces with Kronos if he didn't feel confident in him winning.
- Horned Humanoid: Has bull horns.
- Know When to Fold 'Em: Retreats after Kronos' defeat. He has nothing left to gain but trouble if he keeps fighting Poseidon at that point.
- Making a Splash: Part of his domain. He was the supreme ruler of the sea before Poseidon was born.
- Our Mermaids Are Different: Mainly takes shape of a merman, though he does able to change into humanoid form.
- Screw This, I'm Outta Here: After Kronos' defeat, Oceanus escapes back to the ocean. Why Poseidon doesn't pursue him is unknown, but they may rule different parts of the sea.
- The Siege: Launches a siege against Atlantis in The Last Olympian. He manages to conquer it after Poseidon leaves to assist the battle against Typhon, but he releases it once Kronos is defeated.
Prometheus
- Adaptational Villainy: Again, like Oceanus, a Titan who's on the gods' side in the first war is turning their back in favor of the Titans. Although it's pointed out he's at least partially doing it out of revenge for Zeus chaining him to a rock and having a vulture eat his liver every day for centuries. For some reason, he's also totally cool with Kronos' plan to kick humanity back to the stone age, when in the original myths his defining trait was caring for humanity so much that he defied Zeus to give them fire.
- Affably Evil: If one can call him evil.
- Anti-Villain: His main motivation is getting back at what Zeus did to him - which, when you keep in mind what Zeus did to him, isn't entirely unjustified.
- I Fight for the Strongest Side!: He's foreseen that the Titan's will win the war and this is why he's on their side.
- If My Calculations Are Correct: Implied that part of his foreknowledge is his ability to calculate probability to predict the most likely outcome.
- Know When to Fold 'Em: After Kronos's defeat, he went into hiding and sent a list of excuses to Zeus explaining his actions. According to Hermes, Zeus probably won't punish him, as long as he keeps his head down for the next few centuries or so.
- Revenge Before Reason: One possible interpretation of his defection. He himself doesn't even deny he wants revenge when Percy brings it up.
- Scars Are Forever: Thousands of years after Hercules freed him he still has the scars from the vulture that tortured him every day during his punishment. Percy compares their appearance on his human-sized form like he was attacked by a very angry hamster.
- The Smart Guy: Among the Titans who appear, he's the most intelligent and predicts the Olympians' loss this time.
- Villain Has a Point: He is right that the Gods tend to be jerks a lot like when they unfairly punished him and the other neutral Titans.
Koios
Titan of the North and forethought. He was said to take part in the war but never appeared, so his tropes can be found here.
Gods
Hecate/Trivia
Goddess (technically Titaness) of magic. For related tropes see here.
Janus
Roman god of choices.
- Foreshadowing: Janus is a Roman god, among a world that's been so far established to be Greek through and through. This would end up foreshadowing the existence of the Greek Gods's Roman counterparts in The Heroes of Olympus.
- Multiple Head Case: He has two faces, each of which has its own mind.
- Sadistic Choice: His favorite kind.
- Sadly Mythtaken: Janus is treated in the novels as a minor, secondary god of lesser importance. In truth, Janus was one of the most important and revered Roman gods, considered as an equal power to the twelve Olympians.
- Two-Faced: He has a face on the left and right sides of his head.
Keto
Goddess of sea monsters.
- Brother–Sister Incest: Her husband is her brother, Phorcys.
- Monster Progenitor: She gave birth to Ladon, the skolopendra, the gorgons, and the Grey Sisters. Her most notable child is Echidna, herself an infamous Monster Progenitor, making Keto the proud grandmother to a whole host of nasties.
Melinoe
Goddess of ghosts.
- Dead Person Impersonation: As the goddess of ghosts, she can take on the appearance of anyone who has died.
- Sadist: She sided with Kronos because Hades won't allow her to torment mortals during the day.
- Two-Faced: All the way down her body. One side is pale and bloodless, the other black and mummified.
Morpheus/Somnia
God of dreams.
- Convenient Coma: He can put people to sleep for months at a time if it suits him.
- The Faceless: He has a face, but it's blurry and constantly shifting so no one can actually remember it.
- Forced Sleep: If he doesn't want you awake, you won't be.
- Psychic Dreams for Everyone: He's the one responsible.
Nemesis
Goddess of balance and vengeance. For related tropes, see here.
Phorcys
God of the dangers of the sea.
- Brother–Sister Incest: With Keto.
- Monster Progenitor: He's the father of Keto's various children.
- Silly Walk: He moves much like a crab.
Pomona
Roman goddess of plenty.
- Edible Ammunition: Throws food at Percy when he only weakly responds to her rant.
- Living Statue: Only appears as an angry living statue.
Monsters
The Minotaur
- Back for the Finale: He returns in The Last Olympian.
- Battle Trophy: His horn is left behind after Percy kills him with it. Once he regenerates, he returns the favor by collecting the camp necklaces of the half-bloods he kills.
- Foe-Tossing Charge: His favored tactic.
- Half-Human Hybrid: Half human, half bull.
- Impaled with Extreme Prejudice: How Percy kills him. Both times.
- Starter Villain: He's the first supernatural being Percy encounters.
- Villain Forgot to Level Grind: Percy's taken several levels in badass by the time they fight again. As a result, the Minotaur is quickly reduced to dust.
- Walking Shirtless Scene: In his first appearance.
Agrius and Oreius
A pair of twins born from a union of human and bear. They serve as Luke's bodyguards.
- Bears Are Bad News: Two half bears adds up to one full bear's worth of danger.
- Bodyguarding a Badass: They're actually less dangerous than the person they're supposed to guard.
- Dumb Muscle: Neither of them are particularly intelligent, though Oreius is far dumber than his brother.
- Half-Human Hybrid: Half human, half bear.
Dr. Thorn
- Adaptational Wimp: In most myths, the manticore's venom is instantly fatal; by Thorn's own admission, his venom causes pain and paralysis, but won't kill.
- Beware My Stinger Tail: A scorpion tail that shoots spikes.
- Cruel and Unusual Death: Mr. D crushes him to death with grapevines.
- The Heavy: To Atlas for most of The Titan's Curse.
- Mix-and-Match Critters: Part lion, part human, part scorpion.
- Near-Villain Victory: He comes very close to killing Percy and his friends.
- Our Manticores Are Spinier: A manticore in disguise.
- Poisoned Weapons: The spikes fired from his tail are poisonous.
- Sanity Slippage: The stress caused by his role in Atlas's army combined with constant failures takes a tole on his mental health. He is calculating and puts on an air of sophistication at the start of the story but behaves nearly as bestially as his appearance by the end.
The Nemean Lion
A lion with invulnerable skin first killed by Heracles.
- Attack Its Weak Point: Only its skin is invulnerable, not the inside of its mouth. For its part, it's entire aware of this trope and tries to open its mouth and eyes as little as possible while fighting.
- Battle Trophy: Its pelt is left behind after its death.
- Nigh-Invulnerability: Its skin is completely impervious to harm.
Kelli
An empousai who first served in Kronos's army, but later revealed to have actually been serving Gaea. Her tropes can be found here. For more on empousai go here.
Tammi
An empousai that posed as a cheerleader in Goode High School. She is Kelli's trainee. For more on empousia go here.
- All Guys Want Cheerleaders: Unfortunately it's implied to be how she gets her food.
- Chuck Cunningham Syndrome: Her sister Kelli reappears in The House of Hades, but she doesn't. Her essence is most likely still down in Tartarus, reforming.
- Gibberish of Love: Her charm causes this."I said something really intelligent like, 'Uhhh?'"
- Icy Blue Eyes: Only in her human form though.
- Kiss of Death: Tries and fails to entice Percy into one of these.
- Obfuscating Stupidity: She puts on a Valley Girl accent to try and appear harmless.
- Pom-Pom Girl: As part of her cheerleader disguise.
Kampê
Ancient jailer of the cyclopses and hundred-handed ones.
- The Dreaded: Briares is absolutely terrified of her.
- Dual Wielding: She dual wields scimitars.
- Hybrid Monster: She's some combination of gorgon, dragon, and centaur.
- Laser-Guided Karma: She's killed by one of her own former prisoners.
- Poisoned Weapons: One touch from her blades will make you shrivel into dust.
- Wardens Are Evil: Just ask any of her prisoners.
Karkinos
A giant crab first sent by Hera against Heracles during his battle with the hydra.
- Attack Its Weak Point: Its armor is nearly impenetrable, but like all crab it has a weak spot on its underbelly.
- Giant Enemy Crab: Natch.
Clazmonian Sow
A giant flying sow sent against the defenders of Long Island.
- Airborne Mook: It's the flying equivalent of the Erymathian Boar.
- Pink Means Feminine: It's female and bright pink.
Lydian Drakon
A giant drakon, fated to be killed by a child of Ares, that was sent against the defending forces of Long Island.
- Alien Blood: It bleeds green.
- Attack of the 50-Foot Whatever: It's a two hundred foot long snake.
- Battle Trophy: Its skin is left behind after it dies.
- Death Glare: Potent enough to paralyze anyone who makes eye contact.
- Eye Scream: Percy stabs out one of its eyes.
- Glass-Shattering Sound: Its roar shatters every window on the block.
- Nigh-Invulnerability: Not a magical variety, it just has really thick armor.
- Plot Armor: A justified in-universe version. It's so dangerous because only a child of Ares can kill it, making any other attempt futile.
- Snakes Are Sinister: It's a giant snake and a key part of one of Kronos's schemes.
- Super Spit: It spits acidic poison.
Queen Sess
Queen of the Scythian Dracanae.
- King Mook: Queen actually.
Hellhounds
Monstrous hounds from the Underworld that serve many masters. For related tropes, see here.
Spartoi
Spartoi (singular spartus) are skeletal warriors created by planting the teeth of dragons and watering them with blood.
- Armies Are Evil: Their Mist disguises look like soldiers, fitting with Atlas's military motif.
- Battle Baton: Their preferred melee weapons.
- Blood Magic: Part of the ritual that creates them.
- Color Motifs: Grey.
- Elite Mooks: They're much more threatening than any of the other monster groups the heroes face.
- Glowing Eyes of Doom: The only patches of color on them are their glowing yellow eyes.
- Let's Split Up, Gang!: They split up to cover more ground.
- Muggles Do It Better: Most of Kronos's warriors use weapons from the era of their birth. The spartoi use guns.
- Nigh-Invulnerability: They're immune to the usual methods of monster killing and can only be destroyed by a child of Hades.
- The Nose Knows: Once they have a scent they can track their prey across a continent.
- Our Zombies Are Different: Unlike the skeletal warriors used by Hades they're their own species rather than animated remains, albeit one with strong ties to the underworld.
- Perpetual-Motion Monster: They never tire in combat or on the hunt.
- Pulling Themselves Together: If you smash them apart they'll just pull themselves together and keep coming.
- Super-Persistent Predator: They never give up once they have a target. The prey can put distance between them through a variety of mundane and magical means, but the spartoi will march after them until the gap is closed. The prey can hide behind magical barriers, but the spartoi will find a way through. In short, the hunt doesn't end without the death of the hunted of the hunters.
- True Sight: They can't be fooled by illusions or invisibility.
Telekhines
The former blacksmiths of the gods, creators of Posiedon's trident and Kronos's scythe.
- Aquatic Mook: They have the best maneuverability in the water out of any of Kronos's forces.
- The Blacksmith: For Kronos's army.
- The Dog Bites Back: They're bitter about being used and discarded by the gods so they sided with Kronos to overthrow them.
- Kill It with Fire: They're fireproof, so a favored tactic of theirs is to throw lumps of molten metal at foes.
- Monstrous Seal: They look like a combination of seals, dogs, and humans.
- Mooks: Some of them show up as warriors during Kronos's assault on Long Island.
Keres
Battlefield spirits of plague and famine.
- Poisoned Weapons: Their claws inflict plagues with but a scratch.
- Winged Humanoid: Their general appearance.
Other
Mortal Mercenaries
Ordinary humans enticed to serve those who would destroy them.
- Black Helicopter: Their primary form of transport.
- Blood Knight: Atlas appreciates their violent tendencies.
- Driven to Madness: Some of them are temporarily driven mad by Mr. D.
- Mooks: For Atlas.
- Muggles: Just humans who were hired by the Titan Army.
- Only in It for the Money: They get paid and they follow orders. Justified, as they don't exactly know about the centuries long mythical conflict and as such can't really choose a cause.
- Private Military Contractors: Their line of work.
- The Unfought: They mainly appear in support roles, while any that actually threaten the heroes are dealt with by others. Justified, as the heroes are all carrying weapons that couldn't harm mortals if they tried.
- Weak-Willed: The Mist and other forms of magical mind control do away with petty moral concerns.
Typhon
Child of Gaia and Tartarus, one of the most dangerous beings to every walk the earth. While he served a tremendous role in Kronos's war plan he was not truly part of his army, so his tropes can be found here.
