Zuma Unji

He is a student at Renjaku High School and the leader of a gang of outcasts from other high schools. A user of Yokai powers, he gets ahold of one of Okarun's balls to attempt to beat the diorama board game Danmanra.

Backstory: His brother and father died. His mom jumped in front of a train trying to kill him too. Than he was sent to an orphanage, later started to became a delinquent. He fought against police and got arested. Police officer that arested him Bega, Masamichi, took him in and took care of him.

(Source: Dandadan Wiki)