Ashitare (尾宿, Ashitare) is a werewolf from Hokkan whom Nakago found in a circus tent; until then, Ashitare apparently was a circus side-show. Because of his werewolf nature, Ashitare was shunned and unwelcome wherever he went. Hardened and angry, he developed a hatred of humans and would devour human flesh after killing them. Because of Ashitare’s brute strength, he is seemingly unstoppable.

When Soi fails to kill Miaka and the Suzaku warriors, Nakago sends Ashitare to obtain the Shinzaho of the Priestess of Genbu. He kills Nuriko during the fight to acquire the Shinzaho, but his neck is broken and he is left in a transformative near death experience. Though Nuriko has killed Ashitare’s human side, Ashitare’s beast half takes over his body and successfully steals the Shinzaho and delivers it to Nakago. With his usefulness to Nakago exhausted, Nakago kills Ashitare.

Source: Wikipedia