Fan Casting Mamoru Rin in Pokémon Mystery Dungeon (Anime)

Mamoru Rin is a 16 year old highschool student, unsociable because was abused by his uncle and felt abandoned by his mother while she was working overseas. He picks fights with bullies and admired by children, one day while he was walking home, he loses consciousness and he hears a voice that tells him to save the world of Pokemon. And when he wakes up, he discovered not only he wasn't in Tokyo anymore, but also turned into a Riolu.