Aiko is a notably small and short girl with short, wavy, brown hair and a noticeable blush on her cheeks. She has heterochromia; her left eye is green, while her right eye is blue. She also wears a yellow bunny hoodie over the standard Hope's Peak Academy's uniform. The ears seem to mimic her expressions—when she is frightened, the ears droop. She also wears black socks and white slippers that have a bow on the instep. She appears to have a childish and naive personality.