TV-Series
Description
Igor Neuhaus is a character from the Blue Exorcist anime who serves as an instructor at the True Cross Academy, where he teaches magic circles and seal techniques. He is a 39-year-old man, born on November 13, and according to the anime, he is from Poland. Standing 182 cm tall, he is a pale-skinned man with long brown hair and blue eyes, but his most distinctive feature is the eyepatch he always wears over his left eye. He keeps bandages wrapped around his fingers and arms, which conceal summoning tattoos. His weapon of choice is a giant compass, and he is known to keep multiple identical spare eyepatches.

In terms of his professional standing, Neuhaus is an Upper First Class Exorcist who holds the titles of Tamer, Doctor, Aria, and likely Knight. He is considered a leading authority in the field of corpse and zombie research, commanding numerous corpse-type demons, including the powerful Naberius. Before the Blue Night, he was a Doctor of Demon Ecology and a senior researcher specializing in corpses and zombies.

Neuhaus's entire life and personality have been shaped by the traumatic events of the Blue Night. During this catastrophic incident, he was momentarily possessed by Satan and forced to kill his own family, including his beloved wife, Michelle Neuhaus. He survived the possession, but his left eye was burned out by Satan's blue flames. This tragedy instilled in him an immense and unyielding hatred for Satan and all demons related to him. He is determined, severe, and tenacious, with an obsessive and meticulous nature when it comes to his research. He suffers from chronic insomnia, sleeping an average of only three hours per night, and has nightmares about the Blue Night. Despite his hatred for demons, he shows a paradoxical and absolute loyalty to Mephisto Pheles, who is secretly Samael, the King of Time and another son of Satan, willingly executing any command given to him. He also remains deeply devoted to the memory of his deceased wife, stating that his ideal type of woman is "my wife".

Neuhaus's role in the story is initially as an antagonist driven by his hatred. He believes that as Satan's son, Rin Okumura is inherently evil and must be destroyed. Acting on secret orders from Mephisto to act as an accelerator for Rin's power, Neuhaus attempts to assassinate Rin while he sleeps and later attacks him directly, summoning a high-class Naberius demon. However, his plot fails when Rin and his brother Yukio work together to subdue him. After this incident, Neuhaus is suspended from his teaching position and his whereabouts become unknown.

Following his suspension, Neuhaus continues his work in secret. For the fifteen years after the Blue Night, under Mephisto's clandestine orders, he worked as an assistant, using the name Triangulum, on the production of anti-demon special substances. He continued his research by illegally entering an asylum that Mephisto had isolated in a different dimension. Even after his assistant died, he persevered alone and eventually completed the project, creating a device called the Devil Banisher. He later used this to save the Four Knights from an attack by artificial zombies at the K.R.C. Research Institute, demonstrating his enduring skill and complex motives.

Neuhaus possesses several notable abilities that make him a formidable exorcist. As a high-level Tamer, he has the willpower and spiritual fortitude to summon and control powerful demons, and he can shed large volumes of blood to summon masses of lesser demons to distract opponents. He is also a capable melee combatant, displaying considerable skill with his giant compass used as a sword. His expertise in magic circles allows him to draw complex summoning circles in seconds, and he uses the aria incantations tattooed on his arms for summoning. As an exorcist, he has also undergone the Mashō Rite, granting him spectral awareness and the ability to see demons.