Residence: Scarlet Devil Mansion
Stage 4 mid-boss. Similar to Daiyousei, she received no character profile in the game and was named Koakuma (lit. "Little Devil") by fans. However, she is quite popular considering her status, more so than some of the lesser liked stage bosses. ZUN later described her to be like Daiyousei — whimsical, enjoys pranks, and doesn't think before doing. He also added that while devils are powerful as vampires and magicians, Koakuma is a rather weak one, therefore, she is a Koakuma (Little Devil).