Phobos

Part in TNSO
Phobos is the youngest male child born to Aphrodite and Ares, and the older brother of Demitra. He is the most violent, yet most mature of his siblings. Though he is the youngest, he is also the strongest and one that hates the Haden twins more than anyone else. He is introduced in the third book by Toya, who's in Vamperine.