Yukiko has long blue hair which reaches her waist, but she keeps it tied up into a low ponytai with a pink hair tiel. Her bangs are cut straight and frame her face. Her eyes are teal in color.
Like the other female students at Mizukihana High, she wears a white sailor suit with a dark grey collar, and deep purple pleated skirt. In addition, the uniform also has a deep purple tie, partially hidden under the collar.
Yukiko is a very cold, no-nonsense girl who's quite popular at school for her good looks. She isn't very tolerant towards Mikomi, constantly finding reasons why she doesn't like her even if she likes other people with the same qualities or circumstances. Her parents are rarely home due to work, and has basically raised herself leading to some awkwardness in communicating in a non harsh way.