Koakuma is a minor character from the Touhou Project series, appearing as a librarian-like demon maid associated with the Scarlet Devil Mansion. She is commonly depicted in fan works and official appearances as a quiet, bookish helper who works in the mansion’s library alongside Patchouli Knowledge. Koakuma is not one of the main cast, but she is recognizable for her small red horns, bat-like traits, and mischievous yet subdued personality. Her role is usually that of an attendant or assistant rather than a combat-focused character.