Raku's best friend he has known ever since kindergarten. Shuu is approachable, silly, mischevious, brightly cheerful, and almost always smiling or grinning. His antics label him as the class jokester and, often times, a source of regular comic relief. He expresses an obsession with cute girls and has been described as a skirt-chaser on multiple occasions; because of this, some girls (such as Ruri and Tsugumi) regard him as a low-life pervert. Even though perverted, Shuu is actually popular among the girls in his school.