Satoru Suteguma is a member of Kakerou who faces off against Madarame Baku during the Tower of Karma Arc. Being born a heihaizi in China caused him to have a very rough childhood. He grew up on a human farm where he was forced to do manual labor. He moved to Japan some time after he shot and killed the owner of the human farm.

Spoiler

Satoru was a member of Ideal before joining Kurama-gumi.