Percy, a delinquent, a kid always in trouble and... a demigod? As a son of one of the big three gods or Poseidon, god of the seas, Percy is very powerful and very dangerous demigod. Now he has to use his powers to save the greek gods when there greatest enemy Kronos comes to power.
Annabeth, daughter of Athena god of wisdom and battle strategy. As one of Percy's companions and friends she follows him on very dangerous quests almost dieing day after day. Annabeth was raised by a father and a step-mother who she has had a lot of trouble with.
Percy's best friend, protector and Satyr? Half man, half goat Grover is forced to wear fake feet in public to cover his goat half. As a satyr Grover has looked after Percy even when he didn't know he was a demigod. Because of his animal instincts he can sniff out any monster or threat close to them.