Graf Wilhelm Josef Von Herrman is a high level demon, who poses as a descendant of a line of German counts. He is one of the many demons who attacked Negi's village and the one who turned nearly everyone in the village to stone. He is sealed during the attack and released to gauge the threat that Negi and Asuna represent, and to temporarily disable Negi from combat. He is defeated by Negi and Kotaro, though Negi spares his life. He is connected to Fate Averruncus and his group.

In his human form, he looks like an elderly gentleman wearing a suit and a hat. He is a very strong physical fighter, with a fighting style that seems rooted in boxing, who can use magic without chanting. However, his greatest weapon is his petrification spell. He permanently petrified the citizens of Negi's childhood home. This petrification is seemingly incurable; however, it is revealed in the final volume that Konoka is capable of developing her powers sufficiently enough to restore the citizens.

(Source: Wikipedia)

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