List of characters in mythology novels by Rick Riordan


This is a list of characters that appear in the Camp Half-Blood Chronicles, The Kane Chronicles, and Magnus Chase and the Gods of Asgard.

Overview


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  • A dark grey cell indicates that the character was not in the property or that the character's presence in the property has yet to be announced.
  • A Main indicates a character had a starring role in the property.
  • A Recurring indicates the character appeared in two or more times within the property.
  • A Guest indicates the character appeared once in the property.

''Camp Half-Blood Chronicles''

Introduced in ''Percy Jackson and the Olympians''

Percy Jackson

Percy Jackson is a demigod, son of mortal Sally Jackson and the Greek God of the sea, Poseidon. Percy lives in the Upper East Side of Manhattan and is a New York Yankees fan, but found his life uprooted upon discovering his true paternity. He has black hair and sea-green eyes. He has inherited special abilities from Poseidon which include the ability to control water, boats, and ships; to create small hurricanes; to breathe and see clearly underwater; and to talk to horse-like creatures and most aquatic animals. He is also a gifted swordsman using his shape-shifting sword pen. Throughout the series, Percy uses a ballpoint pen named Anaklusmos for battle; the pen can change into a celestial bronze sword and if he loses it, it will always appear back in his pocket. His fatal flaw is Loyalty.
His mortal life was not the best. He, like all demigods, was diagnosed with ADHD and Dyslexia. This made him the subject of bullying from his peers. Additionally, His mother was once married to Gabe Ugliano, an abusive, gambling addicted, alcoholic in order to protect Percy. His repugnant mortal odor masked Percy's demigod scent, hiding him from monsters. At the end of The Lightning Thief, Sally turned Gabe into stone using Medusa's head. Later, she married Paul Blofis, for whom she has genuine love. Percy also find love at the end of The Last Olympian with his long time friend Annabeth Chase.
Percy is the first-person narrator in the Percy Jackson & the Olympians series. He appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Son of Neptune, The Mark of Athena, The House of Hades, The Blood of Olympus, The Hidden Oracle and The Son of Sobek. In the films, he is portrayed by Logan Lerman. In the musical, he is portrayed by Chris McCarrell.

Grover Underwood

Grover Underwood is a satyr and Percy's best friend. He appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Son of Neptune, The House of Hades, The Blood of Olympus and The Burning Maze.
He has curly reddish-brown hair and fur, acne, and a wispy goatee. His horns grow larger as the series progresses, and he must take increasingly careful measures to hide them and his goat legs while posing as a human. In The Lightning Thief, Chiron states that Grover is small even for his age: He is twenty-eight then, but because a satyr's lifespan is twice that of a human, he is considered a teenager. Grover is quite sensitive and attached to nature. A vegetarian, he is known to eat tin cans, furniture, and worships cheese enchiladas. Like all satyrs, he can sense emotions and "smell" monsters and demigods. As the series progresses, his concern for his friends and the pursuit of his goals leads him to take on leadership roles and become more confident. Unlike his demigod friends, Grover is not an orthodox fighter. Instead, he uses reed pipes or a cudgel. In The Battle of the Labyrinth, Grover begins a relationship with the dryad Juniper.
In The Lightning Thief, he gets a "searcher's license" after delivering Percy safely, allowing him to search for the lost god Pan. When Polyphemus captures him in The Sea of Monsters, he activates an empathy link, a psychic bond with Percy created a year before, allowing them some telepathic communication across great distances. He uses this to guide Percy to his rescue. At the end of The Last Olympian, he is named a Lord of the Wild and given a seat on the satyrs' ruling council, the Council of Cloven Elders.

Annabeth Chase

Annabeth Chase is the daughter of Athena and history professor Frederick Chase. She has an extensive paternal family including Magnus Chase. In The Last Olympian, she and Percy start a romantic relationship. She appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Lost Hero, The Son of Neptune, The Mark of Athena, The House of Hades and The Blood of Olympus. In the film adaptations, she is portrayed by Alexandra Daddario. In the musical, she is portrayed by Kristin Stokes. She is described by her teacher Chiron as "territorial about her friends", which is manifested in some moments of jealousy and distrust. In The Lightning Thief, it is revealed that she also suffers from arachnophobia, a fear shared by her siblings due to their mother's relationship with Arachne, whom Athena turned into a spider. She has had a crush on Percy Jackson ever since he arrived at camp.
Annabeth ran away from her father and stepfamily at age seven and encountered Luke Castellan and Thalia Grace. They lived as runaways until they were found by Grover Underwood and taken to Camp Half-Blood. Annabeth remains attached to Luke and convinced of his goodness even after his decision to support Kronos. Her attempts to bring Luke back into the fold are an important theme in the books. A crucial character to the series' arc, Annabeth even spends some time in Tartarus with Percy and Bob the Titan during The House of Hades. At the end of the series, she and Percy plan to finish high school in New York and then attend college in New Rome. In The Hidden Oracle, Percy states that Annabeth had gone to Boston for "some family emergency" — searching for her cousin Magnus Chase. Annabeth's appearances in crossover shorts with The Kane Chronicles, and in Magnus Chase and the Gods of Asgard make her the only character besides Percy Jackson to have appeared in all three of the Greco-Roman, Egyptian, and Norse mythology series by author Rick Riordan.
Her main weapon is a short celestial bronze knife given to her by Luke. After losing it in The House of Hades, she uses a drakon-bone sword given to her by the giant Damasen. She also uses Sadie Kane's wand when it turned into a dagger like the one Luke gave her. Annabeth also owns an invisibility Yankees cap, a gift from her mother. At the end of The Battle of the Labyrinth, Daedalus gives Annabeth his incredibly advanced laptop which she loses in Tartarus. In the third book of Magnus Chase series, Annabeth wears a UC Berkeley College of Environmental Design shirt, implying that is where she goes to college. Annabeth has dyslexia, as her brain is hardwired to be able to read Ancient Greek, and has ADHD.

Luke Castellan

Luke Castellan was a 19-year-old son of Hermes and May Castellan. He appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth and The Last Olympian. In the films, he is portrayed by Jake Abel. In the musical, he is portrayed by James Hayden Rodriguez.
Introduced initially as the friendly head counsellor of the Hermes cabin, Luke is soon revealed to serve Kronos. He is resentful of his father, who adhered to the gods' policy of non-interference despite May Castellan's mental illness. He ran away from home at a young age and eventually arrived at camp. After the loss of Thalia, a failed quest and continued silence from Hermes, his ongoing resentment turned into a strong hatred of his father and the other gods. Described as decent and kind before Kronos, he behaved with volatility and violence after his defection. Though Luke originally served Kronos willingly, the horrors he witnesses during the Battle of Manhattan convinced him to fight against his former master, eventually committing suicide to stop the [|Titan]. When he died, Luke reiterates what Ethan Nakamura told Percy earlier: unclaimed children and unrecognized gods deserve more respect than they have been given. Percy later fulfills his request.
Luke is described as handsome with sandy hair, blue eyes, and a long scar on his cheek given to him by Ladon. Besides the ability to open locks with his mind, inherited from his father, he is first and foremost an excellent swordsman. He even receives a sword named "Backbiter" from Kronos at the end of The Lightning Thief. It is later reforged as Kronos's scythe and has the ability to harm both mortals and immortals. From Halcyon Green, he receives a diary he later entrusts to Chiron, and a celestial bronze knife he later gives to Annabeth with a promise to always remain her family. From his father he receives a pair of magic flying shoes, which he later curses and gives to Percy. Just before giving himself over completely to host the spirit of Kronos, Luke bathes in the River Styx and obtains the invincibility of Achilles.

Thalia Grace

Thalia Grace is the daughter of Zeus and Beryl Grace, a TV starlet. She is seven years older than her brother Jason Grace and appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Last Olympian, The Lost Hero,The Blood of Olympus, The Dark Prophecy and The Tyrant’s Tomb. In the films, she is portrayed by Paloma Kwiatkowski.
Due to her mother's abusive nature, Thalia had considered leaving home since she was little, but stayed to protect Jason. When Jason is seemingly killed during a visit to Sonora, Thalia finally ran away and stayed with Luke and Annabeth until they met Grover when she was 12. When they reached camp, Hades sent a horde of hell hounds that Thalia held off, sacrificing herself for her friends. Zeus pitied his daughter and turns her into a pine tree where her spirit then provides a magical barrier around the camp. Seven years later, she is purged from the pine tree with the Golden Fleece, applied to save it from poisons that were weakening and destroying the wards protecting the demigods. At the end of The Titan's Curse, she becomes the lieutenant of the Hunters of Artemis, a band of immortal female archers who serve the goddess Artemis, which freezes her age the night before her 16th birthday.
Thalia has blue eyes, spiky black hair, black eyeliner and punk style clothing. Annabeth and Chiron remark her personality and character traits being very similar to Percy's. She also shares some traits with her father, such as his pride, confidence, and vehement reactions to betrayal or contradiction. An incredibly skilled warrior, she is willing to attack even Luke, who was known as the best swordsman of the last 300 years. Thalia's weapons are the shield Aegis disguised as a silver bracelet, and a spear disguised as a Mace can. After The Titan's Curse, she also uses a bow and hunting knives. Her main power is the ability to summon lightning and generate electric shocks. In The Titan's Curse, it is revealed that she has a rather ironic fear of heights, acrophobia. In The Lost Hero, she embraces Jason for the first time in years, only to learn that he had lost his memory.

Tyson

In The Sea of Monsters, Tyson is introduced as Percy's bullied, childish friend. When Percy is forced to take him to camp, it is revealed that he is a baby Cyclops and thus a son of Poseidon, making him Percy's half brother. He appears in The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Son of Neptune, The Mark of Athena and The Blood of Olympus. In the films, he is portrayed by Douglas Smith.
Tyson is tall with unkempt teeth and fingernails, brown hair and eye. He is mentally about 8 years old, but very intelligent and compassionate. As a son of Poseidon, he shares some of Percy's powers. As a Cyclops, he is immune to fire and has super strength, an uncanny ability to mimic voices, enhanced senses, and understands the "old tongue". Tyson also becomes an excellent smith with help from Charles Beckendorf. In The Last Olympian, he proves himself to be a capable fighter and is named a general of Poseidon's armies. Percy is at first resentful of him as a brother, while Annabeth is openly hostile towards him because she was almost killed by a cyclops, but both accept him after their quest together in the Sea of Monsters. Tyson is close with several characters and magical creatures in the series, including Rainbow the hippocampus, the hellhound Mrs O'Leary and the harpy Ella, who eventually becomes his girlfriend. In The Battle of the Labyrinth, Tyson is revealed to be afraid of satyrs, including Grover, he manages to conquer this fear after a quest and they become friends.

Nico Di Angelo

Nico Di Angelo is first seen in The Titan's Curse, as an unclaimed demigod rescued by Percy, Annabeth, Thalia, and Grover. At the end of the novel, it is revealed that Nico is a son of Hades. He appears in The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Son of Neptune, The Mark of Athena, The House of Hades, The Blood of Olympus and The Hidden Oracle.
The character Nico was named after one of Riordan's former students.
Though he appears to be ten years old, he and his elder sister Bianca were born in the 1930s. After Zeus killed their mother Maria, daughter of an Italian diplomat, whilst trying to kill the children, Hades wiped their memories and placed them in the Lotus Hotel, a place in Las Vegas where time stands still. He is a native of Venice and can speak Italian. Nico is initially depicted as cheerful and childish, with olive skin and dark hair, and enjoys playing Mythomagic. He takes the death of Bianca very hard, becoming moody, secretive, and irritable. He becomes angry at Percy, who swore to protect Bianca, but later forgives him. Afterwards, he lived in the Underworld with Hades, where he becomes pale and shaggy-haired and begins wearing dark clothing. Nico, despite being very powerful, is extremely lonely, much like his father. He makes nearby people uncomfortable, partially due to his unnerving weapon of choice: a sword made of iron cooled in the Styx, capable of absorbing monsters' essences rather than banishing them to Tartarus. Until meeting Cupid in The House of Hades, Nico also struggles hiding his homosexuality. During The Blood of Olympus, Nico, Reyna and Hedge transport the Athena Parthenos to Camp Half-Blood. Between The Blood of Olympus and The Hidden Oracle, he begins a relationship with Will Solace, a child of Apollo, after admitting to Percy that he had a crush on him.
Nico's suggestion that Percy takes on the curse of Achilles and his work to convince Hades to fight in The Last Olympian is crucial to the Olympians' success and earn him a short bout of fame. He is privy to the fact that there were two camps, one Greek and one Roman, before The Lost Hero, making him an important liaison between the two groups in the latter series. He brings his half sister Hazel back from the dead and establishes her at Camp Jupiter. At the end of The Son of Neptune, Nico travels through Tartarus to find the monstrous side of the Doors of Death, an experience which leaves him haunted and weak. In The Blood of Olympus, he nearly dies several times while "shadow-traveling", which involves melting into shadows and teleporting himself to different places. His sister whom he brought back from the dead, who goes by the name Hazel Levesque, is the daughter of Hades' Roman identity Pluto.
In The Hidden Oracle, Will Solace introduces him as his boyfriend to Apollo. Although their attraction for each other is hinted in The Blood of Olympus, they are not seen getting together. After the three-legged death race, he is seen assisting Will treat the injured patients. At the end of the book, he helps Apollo and the others fight after he and Will's canoe capsized.

Rachel Elizabeth Dare

Rachel is a mortal girl who can see through the Mist, the force that obscures gods and monsters from most mortals. Her father, Will Dare, is a rich businessman, a fact which she is rather adverse to. She first meets Percy in The Titan's Curse at the Hoover Dam. In The Battle of the Labyrinth, she guides Annabeth and Percy through the Labyrinth to Daedalus's workshop. It is hinted that she has some romantic feelings for Percy which are noticed by Annabeth who becomes jealous. In The Last Olympian, she has strange visions and becomes the new Oracle of Delphi. Her first act as the Oracle is to deliver the next Great Prophecy, setting the plot of the Heroes of Olympus series. She is contacted by Annabeth in The House of Hades to ask for Reyna's assistance to bring the Athena Parthenos back to Camp Half-Blood.
Following the loss of Delphi to Python, as revealed in The Hidden Oracle, Rachel stops visiting camp and begins a frenzied attempt to regain her foresight, not helped by Apollo's disappearance. Once informed of Apollo's arrival, Rachel returns and learns that not only Delphi is lost, but also three other Oracles, and that only Rhea's Dodonian Oracle is still valid. She becomes upset upon learning of the existence of other Oracles, as Apollo hasn't told her before.
She has red hair and freckles, is skilled at painting and drawing and occasionally shown as a non-ADHD foil for her demigod teammates. Percy remarks on her ability to stand still for a long time at a charity event. Due to her power of foresight, Rachel knows a great deal of knowledge before she learns it herself, during her meeting with Reyna, she states Reyna's full name, something only Reyna's best friends know.

Clarisse La Rue

A daughter of Ares and the former lead counsellor of the Ares cabin at Camp Half-Blood, Clarisse is hot-tempered, courageous, strong, an incredible fighter, usually using an electric spear given to her by Ares, and a good military strategist. She can be stubborn and overconfident, much like her father. Despite their similarities, Clarisse has a fear of her father and his anger at her if she should ever disappoint him. This, along with a strong sense of honor and pride, often motivates her actions. She also fears the Labyrinth because of what happened to her boyfriend Chris Rodriguez before she saved him. She is aggressive towards most demigods, including Percy, though she does respect and make friends with a few, including Percy, Annabeth, and Silena Beauregard.
Clarisse makes frequent appearances throughout the novels. first seen just after Percy arrives at camp. In The Sea of Monsters, Clarisse is given the quest to find the Golden Fleece. She is a main character in the short story "Percy Jackson and the Stolen Chariot". In The Last Olympian, Clarisse initially sits out the war for Olympus due to a personal feud. Enraged after the loss of her friend Silena, she later joins the battle with a fury reminiscent of her father's, slaying a drakon singlehandedly and receiving the blessing of Ares. In The Blood of Olympus, Clarisse leads the Greeks in battle to defend the camp. In The Hidden Oracle, it is stated that Clarisse has gone to attend the University of Arizona and her role as counsellor is taken by her half-brother Sherman Yang.
She appears in The Lightning Thief, The Sea of Monsters, The Battle of the Labyrinth, The Last Olympian, The Mark of Athena, The House of Hades and The Blood of Olympus. In the film adaptations, she is portrayed by Leven Rambin. In the musical, she is portrayed by Sarah Beth Pfeifer.

Calypso

Calypso is the daughter of the titan Atlas who is imprisoned on the island of Ogygia for supporting her father during the first titan war. She first appears in The Battle of the Labyrinth, where she nurses Percy back to health. She falls in love with Percy and is heartbroken when he has to leave. Percy asks the gods to release her at the end of The Last Olympian, but she is still residing there when Leo becomes trapped on Ogygia in The House of Hades, having been released from the curse of being forced to fall in love with all those to fall upon the island rather than the island itself. Leo and Calypso subsequently fall in love legitimately. After Leo escapes, he swears on the River Styx that he will return for Calypso. At the end of The Blood of Olympus, Leo gets back to Ogygia and frees Calypso although nobody can go to Ogygia twice.
In The Hidden Oracle, Calypso comes to Camp Half-Blood with Leo and reveals that, due to her choice to leave Ogygia, she has become a mortal. She accompanies Leo and Apollo in the latter's quest to find the Oracles and stop the Three Emperors from conquering North America. Despite this, the two secretly attempt to find a normalcy for their lives and later announce to Apollo that they are going to settle in Indianapolis, although they will continue to help him anyway they can. At the end of The Dark Prophecy, Calypso stays at the Waystation, while Leo goes to warn Camp Jupiter of an impending invasion and Apollo travels with Meg to search for the Erythaean Sybil.
As a sorceress, Calypso can command wind spirits to do her bidding. She loses most of her control of them when she gives up her immortality; however, she is still capable of summoning them to a degree, though by consuming more power than usual. Also, due to spending a long time at Ogygia, she has mastered sewing and lock-picking, which she uses while finding the gryphons at Indianapolis Zoo. She is Leo’s girlfriend as of “The Blood of Olympus”, “The Hidden Oracle”, “The Dark Prophecy”, and “The Burning Maze”.

Introduced in ''The Heroes of Olympus''

Leo Valdez

Leo Valdez is a son of Hephaestus. He likes to joke around and is very humorous. Though he does this mostly to keep himself happy and not too caught up in his tragic past, as well as so that his friends don't guess how broken he is inside. He is described as having curly brown hair, brown eyes, a cheerful face, a slim build, and a mischievous smile. He is Hispanic-American and speaks Spanish and machine. Leo has the ability to create and manipulate fire, a skill no child of Hephaestus has had for 400 years. He also has severe ADHD even by demigod standards. An excellent mechanic, he repairs a bronze dragon running wild in the camp's woods, naming it Festus. Inspired by a blueprint in Bunker 9, an abandoned bunker in the camp's woods, and a picture he drew in his kindergarten time, he also creates the Argo II, the ship the 7 of the Great Prophecy sail on to reach Greece.
When Leo was eight, Gaia tricked him into burning down his mother Esperanza's machine shop in Houston resulting in her death. Leo's remaining family blamed him for killing her and left him a foster child and runaway. He meets Piper McLean at the Wilderness School in Nevada. Later, In The Lost Hero, he meets Jason Grace, who wakes up on a school bus headed to the Grand Canyon with no memories. However, Leo and Piper have Mist-induced memories of meeting and becoming friends with Jason. Leo uses his sarcasm and wit to hide his feelings, especially in regards of causing his mother's death. He sometimes thinks of himself as a seventh wheel, though he proves no less important or skilled than the others. In The Mark of Athena, Hazel learns her former boyfriend, Sammy Valdez, was Leo's great-grandfather. Until he falls in love with Calypso in The House of Hades, Leo flirts with almost every girl he meets in order to cover up his insecurities about never finding love. In The Blood of Olympus, Leo sacrifices himself to annihilate Gaia and dies in the process, but is brought back to life using the Physician's Cure and returns for Calypso on her island, Ogygia. This is an impressive feat, as nobody has ever found Ogygia twice. He and Calypso then journey back to Camp Half-Blood, sending a magic scroll ahead to let his friends know he's alive. When he does arrive at camp, everyone lines up to slap him for keeping them worried so long. As Leo is included in the prophecy of the Grove of Dodona, he and Calypso accept the task to accompany Apollo on his quests in The Dark Prophecy, at the end of which he announces that he and Calypso will be living at the Waystation and leading an ordinary life. When the prophecy of Trophonius requires that someone must warn Camp Jupiter from an invasion, Leo does the task alone.

Piper McLean

Piper McLean is a daughter of Aphrodite and the famous actor Tristan McLean. She is fifteen in The Lost Hero. Unlike most children of Aphrodite, Piper is not particularly concerned with beauty or fashion. Piper is Cherokee on her father's side. She has tan skin, eyes that change color constantly, and choppy caramel/chocolate-colored hair which she cuts herself. She is slim build and of average height. Her demigod "powers" include "charmspeak" and the ability to speak French. She is also occasionally able to see visions in her magic dagger Katoptris, which once belonged to Helen of Troy. The dagger lost that power after the battle against the giants in Athens.
Piper's relationship with her father is mutually affectionate but strained, in part because of the small amount of attention he spares for her. When she was young, Piper used her persuasive skills to "borrow" things to earn a little of his time. After he is kidnapped by the giant Enceladus in The Lost Hero and subsequently rescued by Piper, Jason, and Leo, Mr McLean's relationship with his daughter begins to improve. Piper is also very close to Jason. Though she later learns it was all a trick of the Mist, she was once his girlfriend while they attended the same school. She works hard to recreate this relationship in real life when she comes to Camp Half-Blood. She is also friends with all of the seven quest members in The Heroes of Olympus, especially Annabeth and Leo.
Piper's main weapon is her dagger Katoptris, though she later acquires a magic cornucopia and uses it as a weapon. After being captured by pirates in The House of Hades, Piper asks Hazel to teach her sword fighting, using a jagged celestial bronze sword taken from one of the Boreads.
In The Hidden Oracle, Nico mentions that Piper is currently attending school in Los Angeles, together with Jason. In The Burning Maze, it's revealed that she broke up with Jason a few months earlier because their relationship was forced, and Piper did not like that. Apollo, as Lester Papadopoulos, was confused because the cloud nymph, Mellie, had seemed angry at Jason. This leads him to believe that Jason had broken up with Piper, but it was actually Piper who had. It is later unveiled that she wanted to discover herself and who she really was without the pressure of being the daughter of Aphrodite. The trick of the Mist that Hera used at the beginning of their relationship also contributed to the breakup as that meant that their relationship was technically "fake". Still, she is heartbroken when he dies by sacrificing himself to save her, Apollo, and Meg from Caligula.

Jason Grace

Jason Grace was a son of Jupiter and the mortal Beryl Grace, a TV star of the 1980s, and the younger brother of Thalia Grace. Jason has few memories of his mother, who was compelled to give him up when he was two, but he remembers enough about Thalia to not be surprised when he sees her again, in The Lost Hero. Thalia reveals that their mother told her that Jason was dead, and that this was what finally drove her to leave home, after she run away from home and found Camp Half-Blood. In The Blood of Olympus, that Beryl Grace had become a mania, or spirit of madness. He grew up at Camp Jupiter, the Roman equivalent of Camp Half-Blood, where demigods born to the Olympians' Roman aspects receive their training. In The Lost Hero, he begins a romantic relationship with Piper McLean.
Jason is described as having blond hair, blue eyes, and a scar above his upper lip. He is of above-average height, with an athletic build and muscular arms. By the age of fifteen, he has earned the rank of praetor and leads the legion with his longtime partner, Reyna. Jason also coordinated the Roman camp's attack on the Titan force. He led an assault against Mount Tamalpais/Othrys, a Titan stronghold near San Francisco, and defeated the Titan Krios in combat, much as Percy Jackson defeated Hyperion and helped to defeat Kronos. Of all the characters in the series, Jason is the one who struggles the most with the differences between the Greek and Roman perspectives. Piper McLean describes Jason as very rule- and duty-oriented, though Terminus describes him as a "rule-flouter." When the Argo II is stuck in North Africa, he must choose one identity or the other. He chooses to consider himself a Greek, despite his parentage, and is later unable to command a legion of Roman ghosts. During The House of Hades it is revealed that Jason has plans to return to Camp Jupiter to improve it with things he learned at Camp Half-Blood, such as giving the fauns more rights and responsibilities. Later, during The Blood of Olympus, Jason decides to consider both the Greek and Roman traditions as part of his heritage. He becomes "Pontifex Maximus", a role which will see him travel between Camp Half-Blood and Camp Jupiter to build shrines for every god and goddess in the pantheon.
Although Jason and Percy immediately realize that it is best to work together, and become friends, their relationship is not without antagonism. As Percy puts it, it is natural for two powerful demigods to wonder which of them is stronger after a fight. Jason is a sword fighter like Percy, though they have different fighting styles. Jason uses an Imperial gold sword, styled as a Roman gladius, which he can extend into a pilum at will. Jason also has power over air currents and can fly. He can sense and control some air spirits and, like Thalia, call down lightning, which he conducts through his Imperial Gold weapons, and emit static shocks. Once, he and Percy together summon a hurricane in Charleston harbor. He is then killed during The Burning Maze, by Emperor Caligula. While other demigods, such as Frank, are rescued in later books, it seems that no such care was applied to Jason.

Hazel Levesque

Hazel Levesque is a thirteen-year-old demigod, a daughter of Pluto and Marie Levesque. She first appears in The Son of Neptune, at Camp Jupiter. It is later revealed that she has returned from the dead, assisted by her half-brother Nico. She grew up in the 1940s in New Orleans, where her mother had a gris-gris shop. When she was born, Pluto offered to grant her mother a wish, but her request for wealth backfired into an ability to control precious metals and gems, which both first view as a curse. Hazel died after Gaea tries to use Hazel's power over earth to resurrect Alcyoneus. When Hazel's mother changes her mind about helping Gaea, Hazel buries herself and her mother under the earth, delaying Alcyoneus's rebirth and killing them both. While Hazel's spirit is being judged, she gives up the chance to go to Elysium to save her mother from punishment, and they are both sent to the Fields of Asphodel instead. At some point before The Lost Hero, Nico finds Hazel in the Underworld while trying to visit Bianca di Angelo, only to find she has tried for rebirth. He helps her escape to the world of the living and arranges for her to join Camp Jupiter. Hazel and Nico are protective of each other, much as true half-siblings.
Hazel is described as African American, having cocoa-colored skin, curly cinnamon-brown hair, and golden eyes. Her legion tattoo is described as looking like a cross with curved arms and a head. She is described as being very pretty, and is a strong female role model. She eventually learns to manipulate her curse, manipulating precious stones and metals and sensing structures underground. She is an accomplished horse-rider and skilled with a spatha. She tames the horse Arion, who eats precious metals. She is unusually knowledgeable about the Underworld because of her time there. During The House of Hades the goddess Hecate insists Hazel learn to manipulate the Mist. Hazel becomes very gifted at this. After the Second Gigantomachy, Hazel is promoted to the rank of centurion of the Fifth Cohort, succeeding her boyfriend Frank Zhang. Though she is much cooler than her boyfriend, she finds his inability to be cool endearing. Also as of The Trials of Apollo The Tyrant's Tomb Hazel is now a praetor of the twelfth legion with her boyfriend Frank Zhang.

Frank Zhang

Frank Zhang, nick-named "Chinese-Canadian baby man", by Hazel's horse, Arion, is a 16-year-old demigod, son of Mars and Emily Zhang, a Chinese-Canadian "legacy" who dies during military service in Afghanistan. He is taken care of by his grandmother after his mother's death, and makes his way to Camp Jupiter upon her insistence. Frank's family descends from Periclymenus, a grandson of Poseidon, who had the power to shapeshift. Periclymenus's descendants were sold into slavery in China, and migrated to Canada many years later. While battling Alcyoneus, Frank taps into his ancestral power and transforms into an elephant. However, his combined power of being a son of Mars and having the ability to shapeshift makes his life very fragile. The Fates tied his life force to a piece of firewood when he was a baby, so if the wood burns up, he will die. The goddess Juno appears to his mother and grandmother while he is a baby to warn them of this fact, as he would be crucial to defeating the Giants. In all his life, Frank has ignited the wood thrice, which he can do simply by thinking about it; the first time is while he is finding his way to Camp Jupiter, in bitter cold. The second time is when he, Percy, and Hazel travel to Alaska to free Thanatos. Eventually, Frank entrusts the firewood to Hazel, and in The House of Hades, Calypso creates a fireproof pouch to contain it.
Frank has a meek disposition and is uncomfortable upon learning his father's identity publicly in front of the whole of Camp Jupiter. He suspected himself a son of Apollo, given his skill with a bow and arrow. On his quest in The Son of Neptune, and later during the series as well, he uses an enchanted spear given to him by Mars. To Frank's surprise, the spear summons a skeleton warrior that defeats the basilisks. Frank calls this skeleton "Gray".
As he has been residing in Camp Jupiter for no more than a year, Frank is initially considered a probatio, or rookie, of the Fifth Cohort. During the Roman War Games, Percy impresses everyone with his battle skills and instincts. Mars then shows up, and informs Frank he is his son, and that Frank is to lead a quest. Since only centurions are allowed to lead a quest, Reyna has to promote him to centurion rank. Later, in The House of Hades, Jason surrenders his praetorship to Frank, who uses its authority and Diocletian's Sceptre to lead an army of Roman skeleton soldiers against the monsters in the Necromanteion.
Frank was described as 'cuddly' and 'fuzzy' and with a chubby, babyish face in The Mark of Athena, but in The House of Hades, after summoning the blessing of Mars to defeat a hoard of enemies, he transforms. He is then described as being taller, more muscular, and without all his childhood fat. Though now built like a professional football player, he is still as sensitive as before, and is embarrassed at his new appearance at first.
Initially, he was wary of the tension between Hazel and Leo, as Leo reminded Hazel of her old boyfriend, Sammy Valdez. After Leo's encounter with Calypso, however, Leo became more relaxed around Hazel and there were no more signs of anything other than friendship, much to Frank's relief. He then pursues a relationship with Hazel.
Frank burns his stick for the final time in The Tyrant's Tomb to kill Caligula. Somehow the stick completely burnt, but Frank survived, freeing him from his curse.

Reyna Avila Ramírez-Arellano

Reyna Avila Ramírez-Arellano is a 16-year-old Puerto Rican demigod. She is a daughter of Bellona, a Roman Goddess of War, and the younger sister of Queen Hylla of the Amazons. She and her sister worked for Circe during the events of The Sea of Monsters. She is described as intimidating and a natural leader; she has glossy black hair and brown eyes so dark they look black. Reyna is generally more used to responsibility than other demigods, as she is a praetor at Camp Jupiter. Reyna's demigod "power" is the ability to lend her energy, skills, and character traits to nearby demigods. Similar to Leo Valdez, she can speak English Latin and Spanish. Reyna is often accompanied by two magical dogs, Aurum and Argentum, or by her pegasus Scipio. The immortal winged horse, Pegasus awards her the title of "Horse Friend", because of her kindness towards Scipio and others of his descendants.
In The Blood of Olympus she, Nico, and Coach Hedge go on a quest to return the Athena Parthenos to Camp Half-Blood. While shadow-travelling to New York, the trio stops in San Juan and visits Reyna's former house, haunted by the ghosts of her relatives. There Reyna reveals that the Ramírez-Arellano family has always been favored by Bellona. Reyna's father deeply loved the goddess, but his PTSD turned this love into an unhealthy paranoia. When Reyna was ten years old, he became a mania, or an evil insane ghost. When the mania attacked Hylla, young Reyna picked up the closest weapon and killed what remained of her father. Reyna is reluctant to discuss the incident because patricide is "unforgivable" in New Rome. She formerly loved Jason Grace and Percy Jackson, but they rejected her.

Coach Gleeson Hedge

Gleeson Hedge is a satyr first mentioned in The Last Olympian, as the author of a distress call sent to Grover Underwood. Like Grover, Hedge is also a demigod Protector; his proudest "recruit" being Clarisse La Rue. He disguises himself as a coach at the Wilderness School to escort Piper McLean and Leo Valdez to Camp Half-Blood. He also serves as the adult chaperone for the Argo II and later accompanies the Athena Parthenos to camp. Despite his often warlike and often overly aggressive attitude, Hedge is kind and understanding to campers in need. He enjoys extreme sports and martial arts movies. In The Lost Hero, Hedge falls in love with Mellie the cloud nymph and marries her; by the time of The House of Hades, Mellie is pregnant with a satyr boy. Chuck, the baby, is born at the end of The Blood of Olympus, with Clarisse as his godmother. In The Hidden Oracle, Hedge, Mellie, Chuck, Piper, and Jason are spending the winter in Los Angeles.

Introduced in ''The Trials of Apollo''

Apollo / Lester Papadopoulos

Apollo, in the mortal form of Lester Papadopoulos, serves as the main protagonist of The Trials of Apollo series.
In The Heroes of Olympus, Apollo's Roman descendant Octavian promises the god many things for blessing his prophetic skills, which leads to the Olympians' distraction from the true threat of Gaia, and to the resurgence of Python. As a result, the Delphic Oracle ceases to function, effectively halting demigod quests, and Zeus punishes Apollo. Zeus's punishment consists of making Apollo mortal, though he retains most of his personality and some more minor powers. This punishment is revealed in The Trials of Apollo. In his mortal form, Apollo's name is Lester Papadopoulos.
Following a meeting with two thugs, Apollo encounters a demigod called Meg McCaffrey who claims him as her servant until he regains his godhood. There, Apollo has to adjust himself to a life of mortality and questing to regain his former powers and lifestyle. Apollo is released by Meg after the revelation of her alliance with his enemy.
As Lester, Apollo is a 16-year-old teenager with curly brown hair, blue eyes, acne, and a flabby torso. He is narcissistic, prideful, and arrogant, but does his best to not be a burden on others. His mortal transformation makes him realize how miserable humans are in facing the gods. In particular, he grows to deeply care for Meg and resolves to be with her despite the difficulties involved.

Meg McCaffrey

Margaret McCaffrey is a 12-year-demigod daughter of Demeter and the main character in The Hidden Oracle. Her father was murdered by "the Beast" and she was subsequently adopted by Emperor Nero, considering them as two separate people. Nero taught her the arts of a demigod and gave her a pair of crescent rings which can transform into sickles made of imperial gold, before giving her a task to lure Apollo into the Grove of Dodona. Meg appears to Apollo at an alley of Hell's Kitchen, Manhattan to defeat the thugs, also sent by Nero, to stage "robbery". Meg demands Apollo's servitude and with his travels to Camp Half-Blood with Percy's assistance. There, Meg displays unusual abilities even before Demeter claims her, and later goes with Apollo to search for missing demigods and the Grove in the nearby woods, having to endure a brief abduction in the process. Her relationship with Nero is revealed at the climax, but her growing doubtfulness regarding Nero's ways, not to mention her already familiar friendship with Apollo, leads her to rob Nero of his chance on burning the Grove. While she helps Apollo bring the Grove alive, she severs their bonding spell and leaves.
In the second book, The Dark Prophecy, she returns to Apollo and helps him fight Commodus.
Meg is described as small and pudgy, with dark hair chopped in a messy pageboy style and black cat-eye glasses with rhinestones glittering and shimmering in the corners. She is Free-spirited and adventurous, inquisitive, and is also confrontational. She poses questions with no subtlety, something that Apollo is annoyed with but later comes to regard as a unique trait. Her abilities as Demeter's daughter allows her to connect better with nature as well as summoning a karpos called Peaches, a power that none of Demeter's other demigod children are known to possess.
Even though she is Demeter's daughter, not Ceres she fights like a Roman, with two swords; one for offense and one for defense. She is also known for her liking of unicorns in the fourth book The Tyrant's Tomb.

Hemithea

, known as "Emmie", is a retired Hunter of Artemis and caretaker of the Waystation. She lives with her partner, Josephine, also an ex-Hunter, and their daughter Georgia at the Waystation in Indianapolis. She and her sister were granted immortality by Apollo after escaping from the wrath of their father, King Staphylus. She then joined the Hunters of Artemis and fell in love with fellow hunter Josephine, so sometime in the 1980s, Josephine and Emmie gave up their immortality in order to grow old together. In The Dark Prophecy, she saves Calypso, Leo and Apollo from the Blemmyae with crossbow turrets and lets the trio stay at the Waystation. She comments on the similarities between Calypso and her half-sister Zoë Nightshade.

Triumvirate Holdings

Triumvirate Holdings is a company that is led by three beings who are said to be the worst Roman Emperors in history. They force other people to worship them. During the Second Titanomachy, Triumvirate Holdings was responsible for giving Luke and his allies the Princess Andromeda, weapons, helicopters, and top human mercenaries. During the Second Gigantomachy, Triumvirate Holdings supplied Octavian with different weapons. Rachel described Triumvirate Holdings to be so rich that they make her father's company "look like a kid's lemonade stand." The trio have divided up North America into three major empires and are hunting for Oracles, which they plan to destroy.
Among the known members of Triumvirate Holdings are:

Twelve Olympians

Though not all the gods who appear in Rick Riordan's novels are truly Olympians, all Greek and Roman gods are generally considered to be a subset of the Twelve Olympians. As such, most characters in the series refer to these immortals generally as the "Olympian gods", to distinguish them from the Greco-Roman [|primordial gods] and Titans.
The primordial deities are the deities that came before the Titans and the Olympians came into existence. Among the known primordial deities are:
The Titans are the children of Gaea and Ouranos. Most of them fought against the Gods during the Titanomachy which ended with the Gods winning. Among the featured Titans are:
The Gigantes are giant-like beings that were made by Gaea and Tartarus to overthrow Olympus. They were previously defeated by the gods and Heracles during the Giantomachy. Each was meant to oppose a specific god. They can only be defeated by a god and a demigod working together. The Giants are described as very tall with dragon-like legs and shaggy hair.
The following demigod characters all have one parent who is a Greek or Roman god, while the other parent is a mortal human. It is common for these "half-bloods," as they are known, to grow up unaware that they are not entirely human. They are frequently referred to by gods and other mythological beings as "mortals," though they are certainly more than human.
In this franchise, different historic people are mentioned to have Greek Gods as their parents or are otherwise involved with the series. Among the known historical demigods are:
The following are mentioned not as direct children of the Olympians, but as grandchildren, great-grandchildren, or the like:
The following characters from Greek mythology appear in this series. Most of them are the direct children of gods or Titans, but a few are mortals with such great power that they are able to influence the realm of the gods.

Greco-Roman humanoids

Many of the beings and creatures of Greco-Roman myths are humanoid—in other words, they possess both the intelligence and some of the physical features of humans. The vast majority of these creatures are friendly, such as nymphs and centaurs. Unlike the majority of Greek creatures, these beings are also unquestionably sentient and tend to have larger roles in the novel series.