Nino is a cute and cold-looking girl with waist-length or hip-length straight hair (but it is later cut to shoulder-length in Vol. 4 Ch. 46 and shown in Vol. 5 Ch. 47) that has square bangs hanging over her eyebrows. She has reddish-pink hair, ranging from light pink to telemagenta in Volume 1 and antique pink to red-violet in Volume 4.

Her notable accessories are twin butterfly-shaped ribbons on both sides of her head. Like her sisters, she has dark blue eyes, an average height, a well-endowed figure and large breasts. She wears a long-sleeved sweater that covers her uniform and a pair of white thigh-high socks. Both her and Ichika Nakano use a handbag.

She is noted to be the more fashionable girl among the sisters, as she has various cute accessories and takes care of her nails. Her ears have yet to be pierced, but she plans to have them at least before marriage.