collecting torture devices, searching for tough prey.
A white-haired brute with sharp lizard eyes and is an executive of Aogiri Tree. Yamori is a ghoul who is as scary as he looks. Normally in a entirely white suit and black dress shirt, he resembles a typical gangster.
Yamori developed a sadistic personality that mirrors his interrogator as a means of escaping the reality of his torture when Yamori was a lot slimmer and less bulky before his torture, hinting that his current body frame was built after he become "Jason". This reflects on Kaneki's own physical changes after the torture at Yamori´s hands. He's also a manipulative and deceitful ghoul who would be violent in order to get what he desires. Due to his brutality, he has also become known as 13th ward's Jason.
Yamori is a powerful ghoul. He has great physical strength and speed. To some extent, this is a result of him cannibalizing other ghouls. In the 13th ward, there is almost no one that dares to defy him.
His nickname Jason is a reference to Jason Voorhees, a character of the Friday the 13th movies. At times, Yamori wears a hockey mask, Jason Voorhees' trademark and the fact that he comes from the 13th Ward also adds a reference to Friday the 13th.
(Source: Tokyo Ghoul Wikia)
