Yakumo Oomori

Yakumo Oomori (大守 八雲, Ōmori Yakumo) is an executive of Aogiri Tree. Typically, he is called by his alias Yamori (ヤモリ, Gecko). Due to his brutality, he has also become known as 13th ward's Jason.

Yamori also appears in the side story Tokyo Ghoul: JACK.

Trivia

 * 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.