Koakuma

Touhou AU: Adorable Assistant ----- Koakuma is the bookkeeper of the Scarlet Devil Mansion's library, and the assistant of Patchouli Knowledge. Capable of controlling the arts of fire, ice, and thunder magic, Koakuma possesses the unique ability to track down books and other sources of literary information using its title, even when the item's data itself is corrupted or lost. Thought to be a member of demonkind, and a loyal dedicated worker, Koakuma rarely interacts with the world of Gensokyo outside of the mansion and slips out at night on occasion to prank unsuspecting humans and youkai, though she is weak to sunlight. A formidable force both on and off the battlefield, Koakuma can also cause blindness through song, is able to rapidly regenerate injuries, can move fast, and has enhanced strength with stamina. She'll warm up to you eventually if you show her kindness.