Ruri-chan is the main protagonist of an anime called "The Magical Ruri Hanai: Demon Girl", which is one of Leviathan's favorite animes.
She's a demon who moves to the human world in order to learn more about it. However, in doing so, she loses some of her magical powers and turns into a young girl, only regaining her original form when she returns to the Devildom.
- Ruri-chan has a companion called Azuki-tan, who's an imagawayaki (pancake filled with red bean paste).
- Leviathan admires how she's given up her true form just to learn more about humans, and states that he'd support her regardless of which form she's in. 
- Asmodeus prefers Ruri-chan in her true, grown-up form.
- Her fandom seems quite small in the Devildom as in the Devilgram Offline Ruri-Chan Meetup! neither Asmo, Mammon, or Satan managed to find even one person interested in the fandom meetup.