Characters who appear in The Camp Half-Blood Series (Percy Jackson and the Olympians, The Heroes of Olympus and The Trials of Apollo) and companions like The Demigod Files and The Demigod Diaries. For characters from the TV series, see Percy Jackson and the Olympians (2023)
Demigods
- Main Characters: The SevenIncluding Annabeth Chase, Frank Zhang, Hazel Levesque, Jason Grace, Leo Valdez, and Piper McLean, Nico di Angelo, Reyna Avila Ramírez-Arellano, Apollo, and Howard Claymore.
- Camp Half-Blood: Chiron, Rachel Elizabeth Dare, Will Solace, Meg McCaffrey, Clarisse La Rue, Festus, Calypso, Etc. Argus, Oracle of Delphi, Quintus, Cleaning Harpies, Butch, Clovis, Connor & Travis Stoll, Lou Ellen, Sherman Yang, Billie Ng, Miranda Gardiner, Ellis Wakefield, Mark, Austin Lake, Kayla Knowles, Jerry, Gracie, and Yan, Charles Beckendorf, Harley, Jake Mason, Nyssa Barrera, Drew Tanaka, Lacy, Mitchell, Silena Beauregard, Valentina Diaz, Cecil Markowitz, Chris Rodriguez, Ben, Chiara Benvenuti, Damien White, Paolo Montes, Grove of Dodona, Myrmekes, Pete and Paulie, Blackjack, Mrs. O'Leary, and Peleus.
- Camp Jupiter: Octavian, Etc. Michael Kahale, Larry, Hank, Leilia, Dakota, Gwendolyn, Lavinia Asimov, Pranjal, Bryce Lawrence, Shen Lun, Aurum & Argentum, Scipio, Hannibal, and Terminus.
Gods
- Major Gods: Mr. D, Hera, Poseidon, Zeus, Hades, Etc. Artemis/Diana, Aphrodite/Venus, Athena/Minerva, Ares/Mars, Demeter/Ceres, Hephaestus/Vulcan, Hermes/Mercury, Hestia/Vesta, Akhlys, Chaos, Nyx/Nox, and Ouranos.
- Minor Gods: Pan, Etc. Asclepius, Britomartis, Eros/Cupid, Hecate/Trivia, Heracles/Hercules, Iris/Arcus, Kymopoleia, Nemesis, Nike/Victoria, Persephone/Proserpine, Rhea, Thanatos/Letus, Triptolemus, Aeolus, Boreas/Aquilon, Eurus/Vulturnus, Notus/Auster, Zephyros/Favionus, Achelous, East River, Hudson River, Tiberinus and Rhea Silvia.
- Servants of the Gods: Bianca di Angelo, Thalia Grace, Tyson, Ella, Etc. Phoebe, Zoe Nightshade, Iapetus/Bob, Cerberus, The Furies, Judges of the Dead, Zombies, George and Martha, Cyclopses, The Erymanthian Boar, Ladon, Nikai, Leucrotae, Maenads, Talos Prototype, Hank and Chuck, The Waystation, Emmie, Josephine, Agamethus, Chyrseae Celedons, The Fates, The Boreads, and The Amazons.
Villains
- Forces of Kronos: Kronos, Luke Castellan, Etc. Ethan Nakamura, Chris Rodriguez, Luke's Spy, Alabaster C. Torrington, Atlas, Hyperion, Krios, Prometheus, Janus, Keto, Melinoe, Morpheus/Somnia, Phorcys, Pomona, The Minotaur, Agrius and Oreius, Dr. Thorn, The Nemean Lion, Tammi, Kampê, Karkinos, Clazmonian Sow, Lydian Drakon, Queen Sess, Scythian Dracnae, Spartoi, Telekhines, Keres, and Mortal Mercenaries
- Forces of Gaia: Gaia, Tartarus, Etc. Porphyrion, Polybotes, Alcyoneus, Enceladus, Otis & Ephialtes, Clytius, Orion, Mimas, Periboia, Thoon, Khione, Hippolytus, Midas, Lityerses, Medea, Phineas, Otrera, Sciron, Koios, Lycaon, Euryale and Stheno, Ma Gasket, Sump and Torque, Michael Varus, Eidolons, Kelli, Arachne, Antinous, Eurymachus, Python, King Kekrops, Lamia, Cacus, Venti, Gegeines, Karpoi, Basilisks, Ghouls, Ghosts, Gemini, Cynocephali, the Ourae/Numina Montanum, Chrysaor, and Pasiphaë.
- Triumvirate Holdings: The Beast, The New Hercules, Neos Helios, Python Etc. The Beast's Spy, Cassius, Medea, Germani, Nosoi, Blemmyae, and the Colossus Neronis
Others
- Nature Spirits: Grover Underwood, Coach Hedge, Etc. Ferdinand, Don, Nymphs, Echo, Juniper, Mellie, and Daphne
- Mortals: Sally Jackson, Etc. Beryl Grace, Esperanza Valdez, Frederick Chase, Gabe Ugliano, Hyacinthus, Jane, Marie Levesque, May Castellan, Paul Blofis, Sally Jackson, Sammy, Tristan McLean, Luguselwa, and Shel
- Monsters: Etc. Damasen, Cyclopes, Polyphemus, Gorgons, Medusa, Automatons, Empousai, Serephone, Hellhounds, Tauri Sylvestres, Troglodytes, and Typhon.
- Other: Etc. Arion, Circe, Chrysaor, Halcyon Green, Other Titans, Lupa, the Labyrinth, and Sssssarah.
- "Demigods And Magicians" Relevant Characters: Ptolemy, Serapis, and Serapis's staff.