Giichi Onizuka (鬼塚 義一 Onizuka Giichi) is the scientist assigned to be the partner of Daimon Kazamatsuri, during what he believed to be an experiment capable of curing disease. While the true nature of the experiment was to create new super soldiers for the syndicate, Onizuka himself harbored his own hidden agenda, to create a new breed of warrior, a fusion of grasshopper and man, and be their ruler. In following this pursuit, he deceptively sabotages both ends of the experiment, altering the DNA of both Shin Kazamatsuri and himself.