19 years old. Round-faced non-human. Height: 158cm. Short-lived - Born with a naturally short lifespan. Riri's lifespan is particularly short even among her kind. Appearance: Wears a ribbon tied like a headband around her head. Wears something resembling a poncho. Odd-eyed (black and white). Personality: Very kind and polite to others. Sometimes tells lies to avoid causing trouble for others. Caring and responds brightly to everything. Rarely cries. Details: Childhood friends with Nika, they trust each other deeply. They love each other (as best friends) and can be their true selves together. Riri doesn't feel the need to be overly formal. She keeps her hospital visits a secret because she doesn't want to worry Nika. Tone: Gentle, non-rushed way of speaking. First person: I (polite/feminine) Second person: Nika-chan Laughs in a gentle, cute way, like "Ehehe."