Yamakatsu Katsuya

Yamakatsu was Ganta and Mimi&apos;s school friend. He was killed during the Nagano school massacre by the Red Man. He was always seen with a soccer ball.

Yamakatsu&apos;s last name is Katsuya, but this was only mentioned by Mimi&apos;s father (an anime-only character), so it is considered to be non-canon.