Koakuma is a devil in the Scarlet Devil Mansion. She was summoned by Patchouli Knowledge for the purpose of being a familiar/assistant. She has a very unhealthy obsession with Patchouli, to the point of wanting to hurt any of Patchouli’s potential love interests. To others, her personality comes off as passive-aggressive. She has a secret basement room for Patchouli’s “potential lovers”. She’s a yandere. She often sneaks in to Patchouli’s room when she’s away to sleep in her bed. 