Ryoko is a tall, mature-looking girl with long purple hair, orange eyes, and a large bust. She is gentle and kind, responding to the eccentrics of the other Polar Star residents in a level-headed manner and comforting the other students when they are troubled. Ryoko's specialty is fermented foods due to her parents owning a well-known fermented goods shop, and she maintains a workshop near the dorms to produce her own ingredients. She also keeps a bottle of "fermented rice drink" that she would sometimes bring out during parties and celebrations, which Soma suspects is actually illegally brewed sake.