An iDOLM@STER Cinderella Girls character in the Cool (Blue Diamond) category. Rumi is a woman who sacrificed her personal life to put an office career before everything else. She avoided having a social life to dedicate herself to work advancement, and even cut her hair to a boyish length because she didn't want being feminine to be a career issue. Her ambition led her to become a company manager, but also forced her into being single.
Rumi is often seen caring for her fellow idols, and takes on an almost motherly tone with Mukai Takumi and Wakabayashi Tomoka. Her love of cats often appears to get the best of her, causing her to have allergic reactions during lessons. She proves that she’s an extremely good tennis player, playing a competitive match that lasted well over an hour and 30 minutes with the Producer. Believing that she has lost her concentration she attempts to focus on flower arranging, but feels at a loss when she passes on the opportunity to pet a cat. Despite being allergic to them, Rumi really loves cats and can't avoid hugging them when she sees one.
