Sōichirō Kiryūin

Sōichirō Kiryūin (鬼龍院 総一郎) is the father of Satsuki Kiryūin and Ryūko Matoi. He worked alongside Ragyō Kiryūin in the research of Life Fibers, but turned against her after she disposed of Ryūko for her apparent incompatibility with having Fibers implanted into her organism.