reinhard heydrich (dies irae)
Reinhard Tristan Eugen Heydrich (ラインハルト・トリスタン・オイゲン・ハイドリヒ), also called by his Demon Name, Mephistopheles, is the leader of the Longinus Dreizehn Orden and the main antagonist in Dies Irae. He occupies the seat I in the Obsidian Round Table.
He is named after the Nazi officer Reinhard Tristan Eugen Heydrich.
He has long blonde hair and yellow eyes. His signature outfit consists of a white coat, white collared shirt, necktie, Sam Browne belt, and a stole with Runic text.