Slum King

Slum King is Violence Jack's main antagonist.

History
After feeling depressed about killing Akira Fudo, Satan creates Favel King to punish himself. Slum King holds both Ryo Asuka and Miki Makimura that their arms and legs were severed as sex slaves. He is the ruler of Kanto who was devastated by earthquake, he also has two sons named Zubaban and Jannu who are so cruel both their father. He fights Jack several times and due to interference from Ryo Asuka and Miki Makimura. He still alive even after his brutal death, and even kills is son Zubaban by beheading him, but he was killed by Satan and Zubaban's head is Zenon's head, his face is not revealed until Jack takes off his mask.