Inugami Mikoto

A yokai who transforms into a dog. He is the one who attacked Karuta and cursed her so that she wasn't able to return to her human form, he did the same to other youkais, forcing them to follow his orders blindly. He wants to make the Hyakkiyakou (Night Parade of One Hundred Demons) and is the responsible for the deaths of the main characters except Sorinozuka, who survives. Before killing Miketsukami, he puts a curse on him. In the second timeline, he befriends Watanuki and enjoyed their brief time together to the point of writing a goodbye letter to him before commencing his plans. He targets Shimon and curses Kuroe to keep intruders away so that he can go to the sakura tree safely, once in the sakura tree he uses its powers to go back to the past in exchange of not reincarnating again.