Seiichirou Suzuki

He is a third grade boy who greatly admires Amu Hinamori. His full name is revealed in episode 45 of the anime. In the first episode of the anime Amu rescues him from two rather large boys, and his obsession appears to have developed from this interaction. He is often seen cheering for Amu, admiring her in someway, or proving to Saaya Yamabuki that Amu is a superhero or can save anyone from anything.

(Source: wikia)