Percy, son of Poseidon. Percy is the head-counselor of the Poseidon Cabin (because he's the only person in there) Percy has tan skin, disheveled, jet-black hair swept to one side as "if he just took a walk to the beach" and sea-green eyes. Percy inherited Poseidon's "too changeable, unpredictable" nature. Percy is a very kind-hearted, brave-spirited, natural leader, Percy is characterized by his sarcastic, smart sense of humor, and laid-back demeanor. His girlfriend Annabeth mentions that he is actually quite smart, but seems to act dumb. He has the power to control water.

Luke, Son of Hermes. He secretly works with Kronos to take Olympus down brick by brick. Luke is described as a tall, college-aged young man with an athletic, muscular build. He had short-cropped sandy blonde hair, blue eyes, a sharp nose, and the sneaky look like all Hermes demigod children. As a child, Luke was more selfless and moral in his youth, blaming the gods only for what he saw as injustice, such as Hermes abandoning him and not trying to help his sick mother (whose crazy antics terrified him to the point of run away from home), Zeus abandoning Thalia, and Apollo placing a curse on his son Halcyon. He felt so miserable at the gods that "wanted to pull Olympus down stone by stone", to the point Kronos felt his despair. For the sake of resurrecting Kronos, Luke became crueler and callous than ever, harming his friends for the sake of his goals. Luke had an extremely strong will worthy of a hero.