Rei is a middle-aged woman with an average height and build. She has straight shoulder-length white hair with rather long bangs over her face. Her face has round features, having mellow expressions in casual situations. Her tired-looking eyes are brown-gray with reasonably long eyelashes. Rei was shown to have shorter hair and lighter eyes in the past. Wearing various civilian clothes, Rei favors plain colors and patterns, such as a yellow jumper and orange t-shirt.