赤髪碧童子
Wafuu Fantajii na Utsu Eroge no Nanashi Sentou-in ni Tensei Shitandaga Shuui no On'na ga Yabe Yatsu Nakari de Iyanayokan Shikashinai Kudan character.
An ancient blue oni from hundreds of years ago. She now seeks nothing more than a good death. Yandere.