Yoru (War Devil)

Yoru (ヨル, Yoru?) is the villainous tritagonist of the Academy Saga. She is the War Devil (戦せん争そうの悪あく魔ま, Sensō no Akuma?) who embodies the fear of war. She is a member of the Four Horsemen, who now occupies Asa Mitaka's body as a Fiend