For those who don't remember of know all of the characters, here they are.(for those who havent read to book 3, u prob shouldn't read this)

Percy:Son of Poseidon

Annabeth:Daughter of Athena,Percy's friend

Grover:Satyr,searcher(in 2nd book),Percy's best friend

Tyson:Percy's brother,son(monster?) of Poseidon,Cyclops

Clarisse:Daughter of Ares,Camp half-blood bully

Nico:Son of Hades

Bianca:Daughter of Hades,Nico's sister

Thalia:Daughter of Zeus,Pine boom till end of 2nd book

Poseidon:God of sea,earthshaker,horses(pegasi)

Athena:Godess of wisdom and battle

Ares:God of war

Zeus:God of sky,lightning,King of the Gods

Hera:Godess of Heaven,family

Apollo:God of sun,archery

Artemis:Godess of moon,Archery,Apollo's sis

Dionysus:God of wine,grapes,vines

Hades:God of the Underworld

Aphrodite:Godess of love,beauty