Dark red eyes, matching the color of her long, disheveled hair. Wears a white blouse with a red ribbon, an unbuttoned dark grey cardigan, short dark grey skirt, white knee-high socks and brown loafers. Ryoko is a cheerful, eccentric girl with a neurological disorder that causes memory loss. She relies on her "Ryoko Otonashi Memory Notebook" to record information, she possesses supernatural analytical skills. Ryoko has a crush on Yasuke Matsuda, who assists her with treatment.