Zanmu Nippaku

Zanmu Nippaku is a Human-Oni, or a human who became an oni, who rules over Hell after relocating from the Former Hell to the current Hell. Zanmu Nippaku was formerly a human monk during the Sengoku Jidai period before she started absorbing beast-youkai spirits. Sensing her imminent fall to Hell, Zanmu ventured there prematurely then transformed into an oni who ruled (Former) Hell being admired for her strength, intelligence and charisma.