Rumia

Race: Night Youkai

Ability: Darkness Manipulation

Age: Unknown

Occupation: Attacking Humans

Location: Nomaden




Rumia is a youkai that can manipulate the darkness, but judging from her Embodiment of Scarlet Devil appearance, 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.
In the events of Embodiment of Scarlet Devil, she's attacked by the heroines for no reason (probably just as a general warmup), and has nothing to do with the main story.
According to comments about her in the Bunbunmaru health insurance Newspaper and in Perfect Memento it seems that she's constantly surrounded by a mass/blob of darkness at all times except during the new moon, and so is rarely actually seen in person. Despite her innocent appearance, she eats humans.

She is of no importance to the story, and isn't up to anything in particular in her life. The ribbon tied to her hair is actually a charm; she can't touch it even though there have been times when she wanted to take it off.
There is no evidence of her ability in the game, but in truth, places around her are always as dark as night.