Michael Wittman, known within the narrative as Göetz von Berlichingen, Machina, or Nigredo the Black Knight, is a member of the Longinus Dreizehn Orden, occupying Seat VII. His origin is rooted in the historical figure of Michael Wittmann, a German Waffen-SS tank commander during World War II. Within the supernatural order, he is one of the three commanding knights, serving directly under Reinhard Heydrich. He is physically imposing, standing notably tall with black hair and eyes, and bears the moniker Iron Hand, referencing limbs that have been replaced or enhanced with prosthetic metal components. His personality is described as calm, dark, and enigmatic, often presenting a composed and taciturn demeanor. His primary motivation lies in his unwavering loyalty to Heydrich and the order's objectives, acting as a formidable instrument of destruction. In the story, he plays a major antagonistic role, confronting Ren Fujii in decisive battles, where his immense destructive power and status as an Einherjar—an immortal warrior—make him a critical threat. His key relationships include a friendship with fellow LDO member Lotus Reichhart, with whom he shares a history from their time as tank crewmen, and his role as a trusted commander under Heydrich. Throughout the series, his development centers on his steadfast adherence to his duty and his eventual confrontation with Ren, which tests his identity and purpose. His notable abilities include superhuman strength, durability, and devastating combat capabilities, often channeled through his iron limbs, solidifying his reputation as one of the order's most dangerous members.