Daughter of Athena and aspiring architect, who assists Percy with both strategic planning and combat throughout the novel.

A reserved 12-year-old demigod son of Hades who plays a significant role in supporting the Olympians through his unique abilities.

A satyr and Percy’s best friend, who is deeply connected to nature and aids in the war efforts.

A mortal who can see through the Mist and has prophetic abilities, eventually assuming a significant role related to prophecy.

A Titan god of time orchestrating an assault on the gods, using the body of a demigod to carry out his plans.

Son of Hermes and a key figure with a complicated allegiance, whose actions are crucial to the unfolding events.

A centaur serving as the assistant director of Camp Half-Blood and mentor to Percy, providing guidance to the demigods.

Son of the lesser god Nemesis who finds himself torn between conflicting loyalties in the battle against Titans.

Luke’s mortal mother who possesses the gift of sight, with a backstory involving attempts to connect with divinity.

Daughter of Ares and an initially reluctant warrior who later takes decisive action in the conflict.

Daughter of Aphrodite with a hidden past, who shows bravery and commitment during the war.

An immortal daughter of Zeus who leads the Hunters of Artemis and assists in the demigods' battle against Kronos.

Son of Hephaestus and a senior camp counselor, known for his sacrifice early in the story's events.

The god of the Underworld who initially opposes Percy but eventually supports the Olympian cause with his son's persuasion.

The messenger god and father of Luke, playing a background role related to prophecy and family connections.

The god of the sea and Percy's father who supports the Olympian battle efforts from his underwater domain.