Midari is pale skinned girl with short black hair, which was purple in the manga, that is styled in a concave-cut and extremely tiny pupil(s). In the anime, close-up shots of her eye indicate her eye color to be yellow-green (she has purple eyes in the manga).

She wears a rarely seen variation of the Hyakkaou Private Academy uniform; a sweater vest in the same colors as the school's black and red blazer, a white button-up dress shirt with the sleeves rolled up to her elbows, a dark pleated skirt, purple underwear with a floral pattern, and black socks. She wears the academy's footwear, brown-colored loafers with black soles. She also sports purple lipstick and has purple painted fingernails. She forgoes the black tie and has on accessories such as a purple hairband with a heart-patterned bow attached, and purple wrist cuffs with stripes on either one. She has bandages wrapped on either forearm and wears a white medical eyepatch over her left eye. She is also shown to have two piercings under her mouth, on the left side, one piercing on either ear and a tongue piercing.