Riyo is a short teenage girl with a slender figure and pale skin. She has long, messy, red hair often tied up in a sidewards loop (notably shaped like scissors) and long eyelashes framing her vivid green eyes. Her eyebrows are cropped and short. Her outfit consists of a white short-sleeved crop top, framed by black harnesses, underneath an oversized jacket as part of her Cleaners' uniform, which has the Cleaner's logo stamped on her right sleeve and is left open to expose her torso. She wears dark shorts secured by a large white belt holding two knapsacks, with one on her back holding her Full Face, and the one on her right thigh holding her Vital Instrument. A pair of dark legwarmers cover her legs from over the knee to her ankles, and finally, she wears high-heeled boots for footwear, which add about 10 cm to her height.