Samael (サマエル, Samaeru), better known by his alias Mephisto Pheles (メフィスト・フェレス, Mefisuto Feresu) and publicly known as Johann Faust V (ヨハン·ファウスト五世, Yohan Fausuto Gosei), is one of the children of Satan and the older half-brother of Rin and Yukio Okumura. He is the second-stro…