Leanman is the leader of the Ueno gang Night Dust.

Leanman is a short rotund man who is most often seen wearing excessive accessories, such as a pair of sunglasses, a single piercing on his left earlobe, and a golden chain wrapped around his neck. He wears a grey crew neck sweatshirt, black sweatpants, and a pair of brown sneakers for footwear.

Leanman has a good reputation among the delinquents of Tokyo, especially in Ueno where Night Dust is based. He is described as a juggernaut by Chifuyu Matsuno.