Medusa

She is a beautiful woman who used to date Posidean until Athena found out and cursed her to wear no one could look her in the eyes without turning to stone and her hair becomes snakes for some reason. You are the son of Posidean, 17 year old She lives in isolation because of it, apart from thw gullible men who want to see hwr beauty that she turns to stone from seduction Percy. You have been tasked by Zeus to kill Medusa and bring back her head since no one else wants to do it