Despite her childish appearance, Kei is a mature person, who is often thought of by others as someone to rely on, or as a "big sister" of sorts. Dispite this, Kei isn't actually that happy about taking on everyone's troubles, but instead is simply the type of person who cannot say no to others, causing her to shoulder many people's unnecessary troubles. Even though she took the role of President of the Discipline Committee, she isn't particularly invested in the position, only attending meetings as a formality, and overlooking many of her friends who break the school's rules. She previously confessed her feelings to Keiji Takeda, but was rejected, as the boy was instead in love with Touka Miyashita. Even so, Kei demonstrated her maturity when she got over the situation quickly and continued to speak to her two schoolmates.
Despite her high-school age, Kei looks much younger than any of the other students. She is short, with short, wavy brown hair tied in two pigtails, and large brown eyes. She is shown wearing the white Shinyo Academy female sailor uniform, with the addition of the yellow Discipline Committee armband, which she holds around her left arm.
In the anime, Kei has longer black hair, still tied in pigtails, and wears the female Shinyo Academy uniform, consisting of a blue blazer over a white shirt with a red ribbon tied around the collar, and a pale blue skirt, with the addition of the Disciplinary Committee armband, green this time, around her left arm.
Kei is a normal high-school student. She once confessed her love to Keiji Takeda, but was rejected.
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- Kei's last name, Niitoki, is written with the characters for "new" and "time".
- Kei's first name means "respect", perhaps referencing her respectable position as Discipline Committee President.