A list of most characters in various mythology series by American author Rick Riordan.

Camp Half-Blood Chronicles

Introduced in Percy Jackson & the Olympians

Percy Jackson

Perseus "Percy" Jackson is a demigod, son of Poseidon and the mortal Sally Jackson. Percy lives on the Upper East Side of Manhattan. 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; create small hurricanes; breathe and see clearly underwater; and talk to horse-like creatures and most aquatic animals. He struggles in his mortal life, having ADHD and dyslexia. This made him at first the subject of bullying from his peers. Percy is the first-person narrator in the Percy Jackson & the Olympians and The Senior Year Adventures.

Percy is a gifted swordsman using his shape-shifting sword pen Riptide (Ancient Greek: "Anaklusmos") for battle. It always appears back in his pocket even if he loses it. He is currently dating Annabeth.

In the films, Percy is portrayed by Logan Lerman. In the musical, he is portrayed by Chris McCarrell. Walker Scobell portrays the role in the TV series, with Azriel Dalman playing a younger Percy in flashbacks.

Grover Underwood Grover Underwood is a satyr and Percy's best friend. He has curly reddish-brown hair and fur, acne, and a wispy goatee. His horns grow larger as the series progresses, and he takes increasingly careful measures to hide them and his goat legs while posing as a human. When he first appears, he walks with crutches, which Percy eventually learns are to hide his goat-like trot. He uses reed pipes to play music and sometimes has a cudgel. In The Battle of the Labyrinth, Grover is bestowed a part of Pan's essence by the Lord of the Wild himself Pan. Grover also begins a relationship with the dryad Juniper.

In The Lightning Thief, he earns 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 empathic link with Percy that he had established a year prior and allows telepathic communication across great distances. 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.

In The Heroes of Olympus, Grover mainly appears as one of Camp Half-Blood's satyr allies reporting on Gaea's rising and participating in negotiations with the Romans to get Reyna to help transport the Athena Parthenos statue across the world.

In The Dark Prophecy, Meg summons Grover after getting a prophecy stating that she and Apollo will need a satyr guide. In The Burning Maze, Grover guides the two through the Labyrinth and, alongside the other nature spirits, aids in their fight against Medea and Caligula. After the death of Medea and Helios fading from existence, ending the California wildfires that he was causing, Grover returns to Camp Half-Blood.

In The Chalice of the Gods, Grover volunteers to join Percy's quests to get recommendation letters from the gods so that he can get into New Rome University. Grover uses his nature spirit connections to help search for Ganymede's chalice of immortality and then to help Percy sneak into Mount Olympus to return it to Ganymede in the midst of Zeus' brunch for his mother Rhea.

In Wrath of the Triple Goddess, Grover drinks a strawberry-flavored potion. He destroys Hecate's mansion and Hecuba and Gale escape the mansion, but later in the book, he helps to fix the mansion and get the pets back.

In the films, he is portrayed by Brandon T. Jackson and Bjorn Yearwood as young Grover in the second film. In the musical, he is portrayed by George Salazar. Aryan Simhadri portrays Grover in the TV series.

Annabeth Chase

Annabeth Chase is a demigod, daughter of Athena and West Point history professor Frederick Chase. She has an extensive paternal family, including Magnus Chase. Annabeth has honey-blonde hair and gray eyes. She has arachnophobia, a fear shared by her siblings due to their mother's relationship with Arachne, whom Athena turned into a spider. She also has dyslexia and ADHD but is good at keeping them in check. She is currently dating Percy; she develops a crush on him over multiple books.

Annabeth ran away from her father and stepfamily when she was seven and encountered Luke and Thalia. They lived as runaways until they were found by Grover and taken to Camp Half-Blood. Her attempts to bring Luke back into the fold are an important theme in the books.

Her main weapon is a short celestial bronze knife given to her by Luke. Annabeth also has an invisibility Yankees cap, a gift from her mother. At the end of The Battle of the Labyrinth, Daedalus gives Annabeth an advanced laptop of his and she studies his works. She loses it and her knife in The Mark of Athena when she and Percy fall into Tartarus.

In the films, she is portrayed by Alexandra Daddario, and Alisha Newton portrays a young Annabeth in the second film. In the American musical, she was portrayed by Kristin Stokes. Leah Jeffries portrays Annabeth in the TV series with her younger cousin Marissa Winans playing a younger Annabeth in flashbacks.

Chiron Chiron is a centaur with a white stallion body and a son of Kronos. He is Percy's mentor and the activities director at Camp Half-Blood. He is the mythological Chiron who was granted immortality by the gods for as long as he is needed to train heroes. In The Lighting Thief, he first appears disguised as a Latin teacher, Mr. Brunner, at Percy's school. He also gives Percy Riptide.

In The Sea of Monsters, when Thalia's tree becomes poisoned, Chiron is blamed due to him being a son of Kronos and he is banished from camp. After Percy tricks Luke into exonerating Chiron, the centaur arrives with the Party Ponies, who are Chiron's cousins, to rescue Percy, Annabeth, Grover, and Tyson from the Princess Andromeda.

In The Battle of Labyrinth, Chiron becomes suspicious of the new sword instructor Quintus, who later turns out to be Daedalus in disguise. He also organizes the quest into the Labyrinth and participates in the battle with a monster army invading from the maze. Although Chiron is badly wounded, he survives the fight.

In The Last Olympian, Chiron leaves Percy to lead the army of Camp Half-Blood while he gathers much-needed reinforcements from the Party Ponies. Chiron directly confronts and is defeated by his father Kronos in battle. After Kronos' eventual defeat, Chiron allows Rachel into Camp Half-Blood to become the new Oracle of Delphi.

In The Lost Hero, Chiron refuses to tell the Greeks about the Romans as he has sworn to keep the secret due to the historic rivalry between the two. He eventually admits the truth about the Greeks and Romans after the quest to rescue Hera and the discovery of Bunker 9, but Chiron does not know where the Roman camp is.

In The Blood of Olympus, Chiron participates in the final battle with Gaea and leads a funeral alongside Nico for the campers who were killed in the battle, Greek and Roman.

In The Hidden Oracle, six months later, Chiron is still in charge of Camp Half-Blood, and he is dealing with missing campers, down communications and the arrival of a now mortal Apollo. He later participates in the battle with Nero's automaton.

In The Tower of Nero, Chiron is away from camp when Apollo and Meg return months later to face Nero. Chiron returns in time to receive a message from Rachel summoning reinforcements from camp which Chiron personally leads, disguising it as a field trip for the youngest campers.

In The Sun and the Star, Chiron is left alone at camp with Dionysus, Nico, and Will when the vast majority of the campers decide to return home for the school year. Along with the wine god, Chiron reluctantly authorizes the two demigods to go on a quest to Tartarus to rescue Bob and greets them upon Nico and Will's successful return with the Titan.

In Wrath of the Triple Goddess, Chiron surprises Percy by becoming his substitute history teacher at Alternative High School, although Chiron explains that it is simply a coincidence. Wanting to simply be a teacher sometimes, Chiron got Paul Blofis to put him on the district's substitute list. Percy then learns that Chiron's wheelchair is not just a disguise; he was previously accidentally shot in the leg by Hercules, causing him to have difficulty walking. Chiron provides Percy with information on Hecuba and is gone a few days later, much to Percy's disappointment.

Chiron is played by Pierce Brosnan in The Lightning Thief film and by Anthony Head in The Sea of Monsters film. In the musical, he is portrayed by Jonathan Raviv. In the TV series, he is portrayed by Glynn Turman, with the character depicted with a leg brace on his left hind leg as the result of the war injury.

Luke Castellan Luke Castellan was a son of Hermes and May Castellan. He is described as handsome, with blonde hair, blue eyes, and a long scar on the side of his face given to him by Ladon. Besides the ability to open locks with his mind, which he inherited from his father, Luke is an excellent swordsman.

Introduced initially as the friendly head counselor of the Hermes cabin, Luke was resentful of his father, who adhered to the gods' policy of non-interference despite Luke's mother May Castellan's mental illness. Luke runs away from home at nine years old and eventually arrived at camp aged fourteen with Annabeth and Thalia. After the loss of Thalia, a failed quest and continued silence from Hermes, Luke's ongoing resentment turned into a strong hatred of his father and the other gods. At the end of The Lightning Thief, he is revealed to serve Kronos and receives a sword named "Backbiter" from Kronos. It is later reforged as Kronos' scythe and has the ability to harm both mortals and immortals. Just before giving himself over completely to host the spirit of Kronos, Luke bathes in the River Styx and obtains the invincibility of Achilles.

At the end of the series, Luke is eventually convinced to fight against Kronos, committing suicide to destroy the Titan, who was using Luke as his host, by stabbing himself in his "Achilles' heel" with a celestial bronze knife he had given to Annabeth when they first met with a promise to always remain her family, which becomes cursed after Luke's defection. When he died, Luke reiterates what Ethan had told Percy before: Unclaimed children and unrecognized gods deserve more respect than they had been given.

In the films, he is portrayed by Jake Abel, with Samuel Braun as a young Luke in the second film. In the musical, he is portrayed by James Hayden Rodriguez. Charlie Bushnell portrays Luke in the TV series.

Thalia Grace

Thalia Grace is the daughter of Zeus and Beryl Grace, a TV starlet. Her brother Jason was seven years younger than her.

Due to her mother's abusive nature, Thalia had considered leaving home since she was little, but stayed to protect Jason. When Jason is sacrificed to Hera by their mother during a visit to Sonoma Valley, Thalia finally runs away and stays on the run with Luke and Annabeth until they met Grover when she was 12. When they reached camp, Hades sent a horde of hellhounds that Thalia held off, sacrificing herself for her friends. Zeus pitied his daughter and turned her into a pine tree; her spirit then provided a magical barrier around the camp, keeping mortals and monsters out. Seven years later, she is separated from the pine tree with the Golden Fleece, which was applied to save it from poisons that were destroying the magical barrier protecting the demigods.