Igor Neuhaus (イゴール・ネイガウス Igōru Neigaus)

Igor Neuhaus is 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, and has Aria incantations and magic circles tattooed on both arms. He had a run-in with Satan when he was younger, which robbed him of his family and the sight in his left eye, 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 his every command, which is why he stopped his attacks on Rin prior to the latter becoming an Exorcist.

In the anime, he ends up the suspect for the Masked Man attacks on those allied with Rin; however, the truth is much worse. "Someone" used a demon to bring his wife back to life, and her mental instability at the horrible memory of the Blue Night caused her to attack anything related to Satan, even the friends of his sons. He is voiced by Ryōtarō Okiayu and Patrick Seitz in English.[1]