Uiharu Kazari

a character in Toaru Kagaku no Railgun. She is voiced by Aki Toyosaki.

Kuroko Shirai's friend and colleague in Judgment. She attends Sakugawa Middle school along with her friend Saten Ruiko. She is usually shy and humble, and is a constant victim of Saten's skirt-flipping antics (which she does to Uiharu only), She is also known for wearing a headband (and in the Railgun manga, a surgical mask, as she constantly suffers from flu). She has a sweet tooth but is always called for Judgment duties before she can enjoy her sweets. She displays various skills with the use of computers, such as repelling hackers and gathering information.

In Railgun, she is shown as an equally high-spirited girl as her friend Ruiko Saten. She admits that she is composed most of the time because of a "limit" she places on herself most of the time. Without that limit, she is very energetic and can be airheaded at times as well.

Uiharu also displays a deep sense of friendship to those who are close to her, especially Saten Ruiko and, later on, Haruue Erii. Also, it is shown that she and Kuroko have met before the start of Railgun as fellow trainees of Judgment.

Ability
Her yet unnamed ability is temperature regulation of objects she touches. It is revealed in Episode 22 of Toaru Kagaku no Railgun. She is registered as a Level 1 Power User.

Trivia

 * Uiharu's vulnerability to flu is not shown in the anime version of Railgun. Also, the running gag on Uiharu not managing to eat her sweets ended in the Railgun anime as well.
 * In several omake chapters, it is hinted her ability is to control plants. It might be supported by the quality of the flowers on her head, which is very realistically rendered in the anime and it's "growth" from her flashback as a Judgment trainee to the present. This is debunked in Episode 22 of Railgun, which displays a completely unrelated ability. So far, the importance of the flowers on her head remains unexplained, it is often theorised that she may just like wearing them.