Matsumae

Matsumae is a teacher at Seinan Gakuin High School and the homeroom teacher of Shuu Tsukiyama. She is also a Ghoul in the employment of the Tsukiyama family. Shes responsible for keeping an eye on Tsukiyama while acting as his teacher. Shes shown to keep a cool head even when surrounded by ghoul investigators and commanded her group of ghouls in combat. Like her master Matsumae retains a professional behavior even when under what is normally considered pressuring such as a CCG extermination. Source: Tokyo Ghoul Wikia