|Japanese name:||夜刈 十牙|
He lost his right eye trying to save Zero long ago when Zero's old school nurse turned out to be a Level E Vampire and tried to attack both Zero and Ichiru. Yagari told them to leave but in an attempt to help his teacher, Zero refuses and stays. It is during this time that the nurse goes for Zero, that Yagari stands in front of him and gets a blow to his face, losing his right eye. He appears at Cross Academy in the guise of being a Night Class substitute teacher of Ethics, there to follow a , and to assess if Zero is dangerous.
Yagari is shocked to learn the Council of Ancients' decision to punish Zero for the death of Shizuka Hio and later reappears to arrest Zero. Yagari subsequently joins the Headmaster to protect Cross Academy from the Hunter Association.
Voiced by: Hiroki Yasumoto (Japanese), Travis Willingham (English)