Oomori Yakumo

Japanese name:	大守 八雲 （おおもり やくも）
Nickname:	Yamori, Jason

Yakumo Oomori was an executive of Aogiri Tree. Typically, he was called by his alias Yamori (ヤモリ, lit. "Gecko"). Due to his brutality, he also became known as 13th Ward's Jason.

Yamori is a very bulky man with slicked back blonde hair and sharp lizard eyes, and was every bit as scary as he looked. Normally in a entirely white suit and black dress shirt, he resembled a typical gangster. His face closely resembled a gecko. His mask is a reference to Jason Voorhees, a hockey mask that echoed his violent temperament.

Appearance in Tokyo Ghoul: JackIn Tokyo Ghoul: Jack, Yamori was slimmer than he was in the Tokyo Ghoul manga and had black hair. He wore a black suit with a white shirt in the manga but a black shirt in the OVA.

Tokyo Ghoul Wikia