Percy Jackson is a teenager who discovers that he is the son of the Greek god Poseidon. He goes on adventures with his friends and faces monsters, gods, and other dangerous challenges.

Annabeth Chase is a smart and brave demigod who is the daughter of Athena, the goddess of wisdom. She is one of Percy’s closest friends and uses her intelligence and fighting skills to help them on their adventures.

Luke Castellan is a skilled demigod and the son of Hermes. He starts as a friend and mentor to Percy and Annabeth, but later turns against the gods because of his anger and beliefs. He works for Kronos now and his army.

Clarisse La Rue is a strong and tough demigod who is the daughter of Ares, the god of war. She can be aggressive and competitive, but she is also brave and loyal to her friends when it matters.

Nico di Angelo is a powerful demigod who is the son of Hades, the god of the Underworld. He can be quiet and mysterious, but he cares deeply about the people he loves and becomes an important friend to Percy.

Kronos is the powerful Titan god of time and the father of many of the Greek gods. He lured in Luke to his army.

Grover Underwood is a kind and loyal satyr who is Percy’s best friend and protector. He is brave and caring, and he helps Percy and Annabeth on their adventures.