Rumia is a youkai from Touhou Project that can manipulate the darkness; but judging from what she says about her in her first appearance, Embodiment of Scarlet Devil, she is only powerful enough to make it seem like late evening. Apparently she is quite simple-minded, but isn't featured in enough conversations for details about her personality to be revealed. Rumia's hair ribbon is actually an amulet. She can't touch it, so she can't take it off.