Shuu is loud and outgoing. He's best friends with Ishikawa. He likes to play pranks on people and tends to be the one starting the games or activities done by the group. Everyone in the group finds Shuu to be annoying. He's like the human form of a green ball of energy. Seemingly destined never to have a girlfriend, Shuu spends much time bemoaning this fact. However, Shuu doesn't set his sights on any particular girl, so nothing usually comes of this.