After feeling depressed over killing Akira Fudo, Satan created the Slum King to punish himself. He keeps Ryo Asuka and Miki Makimura, who's arms/legs have been sliced off, as his pets. He is about the same height as Violence Jack and has no skin, but instead wears samurai armor. He is the ruler of earthquake-devastated Kanto and has two children, Zubaban and Jannu. He clashes with Jack multiple times and finally loses to Jack due to interference from Ryo Asuka and Miki Makimura. 