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Rumi's Quirk gives her the attributes and abilities of a rabbit. This grants her incredible leg strength, allowing her to jump and kick with extreme force; she can even destroy large chunks of the ground by thumping her foot. She also has excellent hearing thanks to her rabbit-like ears and possesses animal instincts that alert her to nearby danger.
Rumi is a dark-skinned woman of average height. She has red narrow eyes with long, defined eyelashes, and straight white hair reaching her thighs with bangs that part to the left of her face. While slender and curvaceous in frame, she also sports a lean, athletic and well-defined build, especially in her arms and legs. From her Quirk, Rumi has long white rabbit ears pointing upwards above her head, along with a small and white round tail, giving her an overall resemblance to an albino rabbit.
Her hero costume consists of a sleeveless white leotard with dark purple trim around her shoulders and waist, a wide yellow crescent moon design over her chest, and a single thick metal plate wrapped around her midriff. She wears purple thigh-high boots to compliment her leotard, with more plating around the heel and toe areas, making her feet look like those of a rabbit. She also has a pair of thick, white gloves on her hands with long cuffs, sporting small triangular protrusions around their edges.
During the Jaku General Hospital raid, her left forearm was crushed and her right shin was stabbed by a High-End Nomu, while the tip of her right ear got sliced off. In the aftermath of the War, she obtained a prosthetic left forearm and right leg, which are interchangeable in case they get destroyed. She also cut her hair to just below her jaw and adorns a new black belt with her hero costume. During the Final War, her right forearm is bitten off by a mouth on Tomura Shigaraki's arm growth.