Ritsuko has knee-length emerald celesteela green color hair that has spiral curls at the end and blue eyes. Although, after turning into a Shiki, her skin grew paler and her eyes can change into a black and crimson red color when she's hungry.

She is mostly seen in her nurse uniform that consists of a knee length white dress and white stockings and white shoes and she also has to wear a white nurse hat that clips with bobby pins to her hair.