Akihiro Kanou

Professor Kanou, was a physician responsible for Ken Kaneki's transformation into an artificial one-eyed ghoul, using him as a prototype for his ghoulification surgery. In the past, he was employed by the GFG, the CCG, and was later a physician at Kanou General Hospital before joining the ghoul terrorist organization Aogiri Tree. He has also been referred to as a "good friend" by members of the Clowns.