
As Kronos's son, he is initially under suspicion for poisoning Thalia's tree. The mythological mentor of heroes like Achilles and Hercules, Chiron advises Percy and his friends as they navigate the Sea of Monsters. The original activities director of Camp Half-Blood and a centaur. At the end of the novel, the Golden Fleece brings her back to life.

Thalia GraceĪ daughter of Zeus who died saving Luke, Annabeth, and Grover, Thalia was turned into a tree as she was dying, and this tree now protects Camp Half-Blood from monsters. He feels betrayed by the gods, particularly his father Hermes, and is set on destroying them. Luke CastellanĪ son of Hermes who left Camp Half-Blood to work for Kronos, an evil Titan. A figure of Greek myth whose sin against the gods was so horrible that they sentenced him to constantly being tempted by food but never being able to eat it. The new activities director at Camp Half-Blood after Chiron is fired for allegedly poisoning Thalia's tree. In The Sea of Monsters, he has captured dozens of satyrs that were looking for Pan using the allure of the Golden Fleece. PolyphemusĪ Cyclops most recognizable from his role in the Greek epic, the Odyssey. As the novel continues, we learn that Tyson is in fact, a Cyclops, and Percy's half-brother. Percy's friend from school, who is bullied because he is homeless and because people think he's ugly. Smart and a little cocky, Annabeth accompanies Percy on his quest to find Grover. Percy's other best friend from camp, a daughter of Athena who he met last summer.

While searching for Pan, he is captured by Polyphemus and taken to the Sea of Monsters. One of Percy's two best friends, a satyr who used to guide demigods to Camp Half-Blood.


The narrator and hero of the book, Percy is a thirteen-year-old demigod who is the son of Poseidon.
