This is a list of characters that appear in the Camp Half-Blood chronicles (which consists of the Percy Jackson & the Olympians series, The Heroes of Olympus series, and The Trials of Apollo series), The Kane Chronicles, and Magnus Chase and the Gods of Asgard.
Perseus "Percy"Jackson is a demigod son of the mortal Sally Jackson and the Greek god Poseidon. He is the main protagonist and first-person narrator in the Percy Jackson & the Olympians series and appears in every book of the Camp Half-Blood chronicles except The Lost Hero and The Dark Prophecy. In his most recent appearance in The Hidden Oracle, the seventeen-year-old Percy states that he and his girlfriend Annabeth Chase plan to finish senior year in New York before heading to the college in New Rome.
Percy is described as having a "Mediterranean" complexion, with black hair and his father's sea green eyes. The powers he inherited from his father include controlling water, making hurricanes, breathing underwater, and talking to horse-like animals and sea creatures. He is also a notably good swordsman. Throughout the series, Percy fights by using a ballpoint pen named Anaklusmos (Ancient Greek for "riptide") that changes into a "celestial bronze" sword. Percy's fatal flaw is excessive personal loyalty, which he does not at first see as a danger.
Annabeth Chase is one of protagonist Percy Jackson's closest friends and later his girlfriend, first appearing as a twelve–year-old who helps nurse him back to health after he fights the Minotaur. She is the daughter of the goddess Athena and mortal history professor Frederick Chase, from whom she has an extensive paternal family. Annabeth has blond hair, stormy gray eyes, and tan skin. As a daughter of Athena, she is naturally intelligent, with a particular gift for strategy and architecture. At the end of The Last Olympian, she is even assigned to redesign the damaged Mount Olympus. Her fatal flaw is hubris, which is excessive pride. She is also described by her teacher Chiron as "territorial about her friends", which is manifested in several moments of jealousy and distrust. In The Lightning Thief, it is revealed that she is terrified of spiders, because of the old myth of Athena and Arachne.
Annabeth runs away from her father and stepfamily at age seven and encounters Luke Castellan and Thalia Grace. They live as runaways until they are found by Grover Underwood and taken to camp. 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. Annabeth is crucial to the plot of each book in the Camp Half-Blood Chronicles, in various ways. She leads quests in The Battle of the Labyrinth and The Mark of Athena. She also 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 who has 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 Mark of Athena, 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 uses an invisibility Yankees cap from her mother and a magic shield. At the end of The Battle of the Labyrinth, Daedalus gives Annabeth his incredibly advanced laptop computer which she loses on the depths of Tartarus.
In the film adaptations, she is portrayed by Alexandra Daddario. In the musical, she is portrayed by Kristin Stokes.
Grover Underwood is a satyr who is Percy's best friend. In the books, he has curly brown hair and fur, acne, a wispy beard. 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 human. He is a vegetarian but also eats tin cans, furniture, and enchiladas. Grover is twenty-eight in the first novel, but because a satyr's lifespan is twice that of a human, he is still physically a teenager. Grover is a very sensitive and nature-conscious person. Like all satyrs, he can sense emotions and "smell" monsters and demigods. As the series progresses, his concern for his friends and pursuit of his goals lead him to take on leadership roles and become more sure of himself. 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.
He is first seen in The Lightning Thief, where he is disguised as a human student at Percy's school, serving as his "protector". Grover later reveals that if he completes a protector mission, he will receive his "searcher's license", and leave to look for the missing god Pan, his life's ambition. When Polyphemus captures him in The Sea of Monsters, he forms a psychic bond with Percy, called an empathy link, allowing them a limited degree of telepathic communication across great distances. He uses this ability to guide Percy to his rescue. He eventually finds Pan in The Battle of the Labyrinth, and receives the wild god's spirit. At the end of The Last Olympian, he is named a Lord of the Wild and given a seat on the satyrs' ruling council.
Luke Castellan is a 19-year-old demigod (in The Lightning Thief), the son of Hermes and May Castellan. Introduced as the friendly head counselor of the Hermes cabin, he is soon revealed to be a servant of Kronos. Luke is resentful of his father, who adhered to the gods' policy of non-interference despite May Castellan's mental illness. Luke runs away from home young and eventually arrives at Camp Half Blood. After the loss of Thalia, a failed quest, and continued silence from his father; his ongoing resentment turns into a strong hatred of not only Hermes, but all the gods. Though described by those who knew him before he joined with Kronos as a nice guy, he later becomes moody and violent.
Luke is described as handsome with sandy hair, blue eyes, and a long scar on his cheek given to him by Ladon. He is first and foremost an excellent swordsman. He even receives a sword named "Backbiter" from his master Kronos at the end of The Lightning Thief. This sword, which is later reforged as Kronos's scythe, has the ability to harm both mortals and monsters. From the demigod Halcyon Green, he receives a celestial bronze knife and diary. Luke later gives this knife to Annabeth with a promise to always remain her family and entrusts the diary to Chiron. From his father he receives a pair of magic flying shoes, which he later curses and gives to Percy. He has also inherited an ability to open locks with his mind, along with a cunning nature, from his father. Just before giving himself over completely to host the spirit of Kronos, Luke bathes in the River Styx and obtains the invincibility of Achilles.
Though Luke originally serves Kronos willingly, the horrors he witnesses during the Battle of Manhattan convince him to fight against his former master, eventually committing suicide to stop the Titan. By doing this, Luke proves himself to be the "hero" of the Great Prophecy. As he dies, Luke reiterates what Ethan Nakamura tells Percy earlier: that unclaimed children and unrecognized gods deserve more respect than they have been given.
In the film adaptations, he is portrayed by Jake Abel. In this version, Luke is also incredibly skilled in unarmed combat, easily overpowering Percy when the latter was carrying his sword.
In the musical, he is portrayed by James Hayden Rodriguez.
Thalia Grace is the daughter of Zeus and Beryl Grace, a TV starlet the god met in the 1980s. She was born on December 22, 1987, 7 years earlier than her brother Jason. In The Lost Hero she is revealed to be the older sister of Jason Grace. Due to her mother's abusive nature, Thalia has considered leaving home since she was little, but stays to protect Jason from her mother's antics. However, when Jason is apparently killed during a visit to Sonoma (in actuality, he is merely presented to Hera), Thalia finally runs away at age 10 and stays with Luke and Annabeth until they meet Grover Underwood when she is 12. When the party reaches Camp Half-Blood, Thalia gives her life to hold off pursuing monsters on top of what would later be called Half-Blood Hill. To save Thalia's life, her father transforms her into a pine tree. Her spirit then provides a magical barrier that protects the camp until seven years later when it is purged from the pine tree by the Golden Fleece.
Thalia is pursued so fiercely by monsters because she is a violation of the "Big Three Oath", which was a promise between the three eldest male Olympians to have no more children, for fear of "The Great Prophecy" coming true. At the end of The Titan's Curse, she joins the Hunters of Artemis, a band of immortal female archers in service to the goddess Artemis. This freezes her age the night before her sixteenth birthday, taking her out of the running for the prophecy.
Thalia has electric-blue eyes and spiky black hair, black eyeliner and punk style clothing. Annabeth remarks that Thalia's personality and character traits (such as her bravery and loyalty) are very similar to Percy's, and the centaur Chiron later says much the same. She also shares some traits with her father Zeus, including sometimes over-the-top pride, confidence, and reactions to betrayal or contradiction. She is also an incredibly skilled warrior, willing to attack even Luke, recognized as the best swordsman Camp Half-Blood has ever known. Thalia's weapons of choice are at first a shield named Aegis disguised as a silver bracelet (this gift from her father causes paralyzing fear in those who see it because the head of Medusa is pictured on the shield), and a spear disguised as a Mace canister. After The Titan's Curse, she uses a bow and hunting knives, but still uses Aegis. 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 fear of heights. In The Lost Hero, she makes a minor appearance and embraces her brother Jason for the first time in years, only to learn that he had lost his memory.
In the film Percy Jackson: Sea of Monsters, she is portrayed by Canadian actress Paloma Kwiatkowski. It was shown that the Cyclopes were the ones who attacked her, Annabeth, and Luke outside of Camp Half-Blood.
Tyson is Percy's younger brother. In The Sea of Monsters, he is introduced as Percy's bullied, childish friend. When Percy is forced to take him to Camp Half Blood, it is revealed that he is a baby Cyclops and a son of Poseidon making him Percy's half-brother. Percy is at first resentful of him as a brother, while Annabeth is openly hostile towards him because her friend (Thalia Grace) was killed by one, but both accept him after they get to know him better during a quest to the Sea of Monsters.
Tyson is described as tall with unkempt teeth and fingernails, and brown hair and eye. He is mentally about 8 years old, but fairly intelligent and extremely compassionate. As a son of Poseidon, Tyson has some limited powers over sea creatures and water. As a Cyclops, he is immune to fire and super-strong; has an uncanny ability to mimic voices; has enhanced senses; and can understand the "old tongue" (the language spoken by Gaea to her first children). Tyson also becomes an excellent smith with help from Beckendorf. In The Last Olympian, he proves himself also to be a capable fighter and is named a general of Poseidon's armies. He leads his fellow Cyclopes into the fight with battle cry of "Peanut Butter!"
Tyson is close with several characters and magical creatures in the series. The first is Rainbow the hippocampus. He also befriends the hellhound Mrs. O'Leary. In The Battle of the Labyrinth, Tyson is revealed to be afraid of satyrs, including Percy's friend Grover; he manages to conquer this fear after a quest with Grover, and befriends the satyr. In the Heroes of Olympus series, Tyson also begins a romantic relationship with the harpy Ella.
In the Percy Jackson: Sea of Monsters movie, he is portrayed by Douglas Smith.
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. Though he appears to be ten or eleven years old and therefore a violation of the "Big Three Oath", in reality he and his elder sister Bianca were born sometime in the 1930s, before Hades took the oath; and, after having their memories wiped, stayed in the Lotus Hotel and Casino until the present day. Their mother was Maria di Angelo, daughter of an Italian diplomat. He is a native of Venice, Italy and can speak Italian.
Nico is initially depicted as cheerful and childish, with olive skin and dark hair, and enjoys playing Mythomagic (a Greek-mythology-themed card game similar to Magic: The Gathering). After Nico learns of Bianca's death, he becomes moody and secretive. Afterwards, 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 many other characters uncomfortable, in part due to his powers over darkness and death and his unnerving weapon of choice: a sword made of iron cooled in the Styx ("Stygian iron") capable of absorbing monsters' essences, rather than simply banishing them to Tartarus. Nico initially blames Percy for Bianca's death, but forgives him after learning that holding grudges is likely his fatal flaw. From this point on until meeting Cupid in The House of Hades, Nico struggles to hide his homosexuality, something he was raised to believe was completely inappropriate. During 'The Blood of Olympus', Nico's task was to transport the Athena Parthenos to Camp Half-Blood along with Reyna and Coach Hedge, to bring peace between the Camp Half-Blood and Camp Jupiter. Sometime after the end of The Blood of Olympus, he begins a relationship with Will Solace.
Nico's suggestion that Percy take on the curse of Achilles and his work to convince Hades to fight in The Last Olympian are crucial to the Olympians' success, and earn him a short bout of fame. He was also privy to the fact that there were two camps, one Greek and one Roman, before The Lost Hero, which makes him an important liaison between the two groups in the latter series. He brings Hazel Levesque, daughter of Pluto and his half-sister, back from the dead and established her at Camp Jupiter. Between The Son of Neptune and The Mark of Athena, 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 transporting himself to different places.
The character Nico was named after one of Riordan's former students.