Riruka is a young, slender girl with magenta eyes and long hair of the same color, which she keeps styled into two pigtails, between which she wears a light-colored hat that has two extensions in the back. A strand of hair hangs down the right side of her face and she has a fringe over her forehead. She also wears a dark dress with white fabric over her breasts with a dark ribbon just above it. She completes her outfit with a pair of thigh-length boots.
Confident and somewhat playful, Riruka appears to be an impatient, hot-tempered young girl, that unleashes her rage even towards her comrades if they disagree with her. She claims to be with her group only for her own agenda and not out of any loyalty to Kūgo. She is extremely talkative and likes having an ongoing one-sided conversation about irrelevant topics. She suffers from extreme myopia but avoids wearing glasses out of her vanity and claims contact lenses make her large eyes go dry too fast.