Igor Neuhaus イゴール・ネイガウス

An Upper First Class Exorcist as well as lecturer in the Academy, who obtained the titles of Tamer, Doctor and Aria. He wears an eyepatch over his left eye, while he has Aria incantations tattooed on both arms. He had a run-in with Satan when he was younger, which robbed him of his family and his left eye's sight, which is why he holds immense hatred for Satan and demons that are related to Satan. Yet ironically, he is extremely loyal to Mephisto, willing to listen to any command of his, which is why he stopped his attacks on Rin prior to the latter becoming an Exorcist.