Igor Neuhaus

Exorcism Academy Instructor (responsible for magic circles and seal techniques). Upper first-class exorcist. Titles held include Knight of the Hand, Engineer Knight, and Chanting Knight. 39 years old. In the anime, he is from Poland.

A man wearing an eyepatch over his left eye. He commands numerous corpse-type demons and has tattoos of magic circles on both arms. He is considered a leading authority in the field of corpse and zombie research. His weapon of choice is a giant compass. Before the "Blue Night," he was a Doctor of Demon Ecology and a Senior Researcher of Corpses and Zombies, but on the day of the incident, he was possessed by Satan, which spared his life but cost him his left eye and his family. He harbors a deep hatred for demons, including Satan, and was ordered by Mephisto to attack Rin, but failed.

Since then, he has been suspended from teaching and is considered missing. For the 15 years following the Blue Night, under Mephisto's secret orders, he worked on the production of "anti-demon special substances" as Triangulum's assistant, and continued his research by unauthorized entry into the Asylum, which Mephisto had isolated in a different dimension. After Triangulum's death, he completed the Devil⭐︎Banisher alone and saved the Four Knights who were attacked by artificial zombies at the K.R.C. Research Institute.