Uiharu Kazari

a character in Toaru Kagaku no Railgun. She is voiced by Aki Toyosaki. She is a Level 1 Academy City student and along with her colleague and friend Shirai Kuroko is a member of the student composed law enforcement organization, Judgment.

Background
She attends Sakugawa Middle school along with her friend Saten Ruiko who often tease her by flipping her skirt (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.

She joined Judgment when she was in still in elementary school along with Kuroko as trainees, they were caught in a post-office robbery attempt where there senpai Konori Mii has gotten injured and Uiharu was taken hostage. After being teleported out of harm's way and subduing the culprits (with the secret help of Misaka Mikoto) by Kuroko, she and Kuroko vowed to mature and become better members of Judgment.

Personality
She is usually shy and humble though she is also 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, as shown during Tokiwadai Dormitory's Festival.

Uiharu also displays a deep sense of friendship to those who are close to her, especially Saten Ruiko and, later on, Haruue Erii, to the point that she will disregard her responsibilities as a member of Judgment.

The Level Upper Incidents
As a member of Judgment and friend of Kuroko she introduces her friend Saten Ruiko to her and Misaka Mikoto.

Although her esper abilities never come into use and despite her weak physical attributes, her skill in computers makes her a great asset for Judgment and is very reliable. This was shown during the Level-Upper arc, she realizes that her friend, Saten, had use Level-upper and had become comatose as a result, which makes Uiharu exhert more effort in trying to discover the culprit, because of this she is the first one to discover Kiyama Harumi's intentions and is intrumental in helping Misaka defeat the AIM Burst creature and revive the comatose users of the Level-Upper. In the end she tearfully reunites with a now conscious Saten.

The POLTERGEIST Incidents
During the second arc, she becomes friends with Haruue Erii and is responsible for her, so much so that she quickly disregarded any suspicion towards her by Kuroko as the culprit of the POLTERGEIST events despite overwhelming evidence, during the previous arc she bonded with Kiyama and trust her more as such she convinces her to hand out all her research to Telestina, she later breaks down when she discovers Telestina's intentions of using the Haruue and the rest of the Child Error students of Kiyama Harumi, during the retrieval operation she aids Kiyama in navigating the highways of Academy City and pinpointed the location where children are kept, finally during the final confrontation between their group and Telestina, she becomes incapacitated by Capacity Down but not before making Telestina talk where the machine to operate Capacity Down is located which allows Saten to find and destroy it.

She is last seen with Saten, Misaka and Kuroko being late for the special event held by Haruee Erii for Kiyama Harumi.

SISTERS Arc (Toaru Kagaku no Railgun manga only)
Kazari is briefly scene busy doing all her summer homework as she was busy with Judgment work all-summer, Mikoto suddenly calls her and asks her about the password she heard from Misaka 9982. She was successful in breaking the code and allowed Mikoto access to the Level 6 Shift Experiment details. It is unknown if Kazari herself have read the files.

Ability
Her yet unnamed ability is temperature regulation of objects she touches. It is revealed in Episode 22 of Toaru Kagaku no Railgun anime. 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.
 * She and Saten Ruiko both have cameos in both openings of Toaru Majutsu no Index anime.
 * 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. The mystery of Uiharu's flower headband is solved Chapter 9 of the Light Novel, as it was described as "artificial flowers".