Yousuke Otoha (乙羽 / 鴉)
Background
Suffering from post-traumatic amnesia, Otoha has accepted the role of protector of Tokyo, the role of Karas, to to defend its inhabitants and the youkai from Eko and his Mikura. With his pocket-watch device (no explanations on that through the series), Otoha can transform into different forms. He can take on the form of "Hishokaku" to fly, or a ninja-like form to fight. As Karas, Otoha is the last bastion of defense against Eko. In his free time, Otoha helping to run a hospital for youkai.