Ruri has brown, waist-length hair that she keeps in a pony tail most of the time, and bangs cut in a hime-style, leaving long fringes to frame her face at both sides. Her ivy green eyes are usually framed in her square, rimless spectacles. Ruri is very short for age and is almost a head shoulder than Kosaki. She tends to look rather poker-faced and gloomy most of the time, and always speaks in an emotionless monotone unless confronted by certain situations.