Tsukune Aono

Tsukune is the main character from the anime/manga Rosario + Vampire. He accidentally finds himself in a school full of monsters, and he is the only human. But the other monsters aren't allowed to be in their monster form, so nobody is onto him. He makes many friends (mostly female, it is a harem anime) mainly Moka Akashiya. He at the end of the first season becomes a vampire in order to surive. Before that he was mostly being protected, but he had no problems throwing his life in the way even if he didn't have powers.