He is a very tall, muscular man with black hair and brown eyes. He wears a white tank top under a black gakuran, as well as blue tracksuit pants and Getas. He has chains around his neck with a whistle hanging in the middle part and emits a blue electric aura from his eyes. Nekomaru is a vigorous, boisterous, openhearted student who is passionate about supporting athletes, but suffers from dyspepsia.