Jason Grace is the main character of The Lost Hero. Jason is a boy who remembers nothing at all, is around 15 years old, and is a half-blood who is the son of Zeus. Since he is the son of Zeus, Jason can summon thunderbolts and can control winds. Jason has blonde hair and is courageous, brave, resilient, and experienced with fighting. Jason is on a quest to save Hera from imprisonment and has 3 days until a giant rises. Later, he finds out that Hera actually stole his memories from him. Jason doesn’t want to save Hera but he has to get his memories back and save the world.
Leo Valdez is another main character who is on a quest with Jason. Leo is a 15-year-old boy who is a demigod, the son of Hephaestus, and has the power of fire. Leo likes to joke around a lot and can think of good plans in dangerous situations. He is also great with machines.
Piper Mclean is also on the quest along with Jason and Leo. She is also around the same age as Jason and Leo. She is Cherokee and has brown hair. She is a daughter of Aphrodite but always feels insecure. She has an ability called charm speak which can convince people into doing whatever she says.
Annabeth Chase is a daughter of Athena and a camper at Camp Half-Blood. She is 18 and has blonde hair. She has earned a lot of respect because of how many quests she's been on. She helped Jason, Leo, and Piper, get to Camp Half-Blood.
Percy Jackson is a son of Poseidon and is a camper at Camp Half-Blood. Since he is a son of Poseidon, he can control water and talk to horses. He is 18 and has black hair. Recently, he has gone missing, so people are going out to look for him.
Chiron is the head director of Camp Half-Blood. He is a Centaur which means he's half human and half horse. He uses a bow and arrow to fight and is very wise. He leads most of the activities at camp.
Hera is a goddess in Greek mythology. She is known to be the queen of the gods. Since she is married to Zeus and is the goddess of marriage, no half-bloods come from Hera. Hera takes away Jason's memory so he can get along with the people at Camp Half-Blood.
Gaea is the main villain in The Lost Hero. She is the goddess of the Earth and ground. She used his son Kronos, to kill her husband, Ouranos, the god of the sky. In The Lost Hero, she tries to awaken one of her sons, Porphyrion, a giant to destroy Zeus. Her plan is to awaken all the giants and kill all of the gods.