Nishiki Nishio is a ghoul whose original feeding ground was taken by Rize Kamishiro. He was a second-year student in the Pharmaceutical Department of Kamii University who was heavily wounded in a fight with Ken Kaneki, but he eventually became a waiter at Anteiku and ally to Kaneki.

Recently, the CCG gave him the nickname Serpent and he is known for killing other ghouls after gaining information out of them.