Mizuchi "Jailbreak King, Eternal Criminal, Rebel King of Hell" Miyadeguchi

About

A vengeful spirit that escapes from former hell, prompting Satori Komeiji to search for her. She's capable of possessing both humans and youkai, taking complete control of their body and even their abilities. Her victims have no memories of anything that happened while they were possessed. Using this possession ability on youkai will also drain all of their magical energy, resulting in them falling into a coma. This is not the case for humans, as unlike youkai, they are not composed of magic energy.

(Source: Touhou Wiki)