The strategic and intelligent daughter of Athena, she has a strong desire to lead a quest and often clashes with others due to her stubbornness and pride.

A satyr and Percy’s best friend, he is on a mission to find Pan and experiences significant personal growth, gaining confidence and leadership skills.

Percy’s half-brother and a Cyclops, known for his strength and childlike innocence, as well as his skills in machinery and understanding of complex ideas.

An 11-year-old son of Hades, who feels isolated and misunderstood, often grappling with feelings of anger and seeking acceptance.

A mortal girl with the ability to see through the Mist, she plays an important role in guiding the questers through the Labyrinth with her unique skills.

A legendary inventor appearing under the alias Quintus at Camp Half-Blood, with a complex nature and a hidden past influencing his actions.

Luke, a half-blood son of Hermes, is in league with Kronos, the main antagonist who desires to rise against the Olympians, setting a significant conflict in motion.

A vengeful ghost with a personal grudge against Daedalus, he manipulates Nico for his own ends and serves as a minor antagonist.

The Olympian god of the forge, his past betrayals have led him to trust only himself and his craftsmanship skills.

The Queen of Olympus and goddess of marriage and family, she wields her influence with a dual nature, offering both assistance and threats.

The lost god of the wild who represents the struggle to preserve nature, and whose fate impacts Grover's journey and growth.