Uiharu Kazari

is 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
Uiharu is a 1st year student attending Sakugawa Middle School in class 1-D along with her friend Saten Ruiko who often teases her by flipping her skirt (which she does to Uiharu only). She is also known for wearing a headband of flowers (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 advanced skills with computers, such as repelling hackers and gathering information.

She joined Judgment when she was still in elementary school along with Kuroko Shirai. They were caught in a bank robbery attempt when their senpai, Konori Mii, had been 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.

She later holds true to this, and joins Kuroko as a member of the 177th Branch office.

Appearance
Uiharu is a small girl who sports short black hair and has golden-brown eyes. She has thick eyebrows but her most striking feature is her headband made out of artificial flowers. In the manga she often wears a facemask because she is easily afflicted by colds and flu.

Personality
Uiharu is usually shy and humble but always friendly. She is also shown as an equally high-spirited girl as is her friend Ruiko Saten. She admits that she is composed most of the time because of a so-called "limit" she places on herself. 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 for them.

Remnant of the Tree Diagram
Kazari first appears in the 8th novel, calling Kuroko regarding a stolen luggage bag with contents that are cooling parts that are installed on computers. Here, she believes that Kuroko is suitable enough for the case they are working on as the luggage bag that was stolen was addressed to a subsidiary of Tokiwadai Middle School. Even though Kuroko knows that there is no such subsidiary in Tokiwadai, and with other strange variables that are connected with the case such as the mysterious victim of the luggage bag stealing, electricity not working properly, Kuroko tries to end the case quickly by catching the robbers as the Anti-Skill that Kazari called will be delayed in their arrival.

Throughout the novel after Kuroko's utter defeat in the hands of Musujime Awaki, Kazari continually assists Kuroko in her mission, despite knowing that Kuroko is severely injured and that the case is beyond their jurisdiction. She gives various information regarding Awaki to Kuroko, like her strengths, weaknesses and other data like Awaki being a guide to the Windowless Building. Kazari later gives a rough estimation of Awaki's probable coordinates based on blindspots in Academy City's security system to Kuroko.

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.

Big Spider Arc
She first appears listening to Kongou Mitsuko's testimony on Big Spider's attack on her. Kazari later appears listening to Konori Mii about Big Spider and praises her senpai for having such knowledge. She is later with Ruiko, Mikoto and Kuroko talking about the recent attack on Mitsuko. She is seen later in the Judgment office and gives information about Big Spider and their leader before Mikoto and Kuroko leave. She is then seen eating together with Ruiko, and is told by Ruiko that she understands the feelings of Skill-Outs and is reassured by her that she will never again give up.

In the next episode, Kazari is seen with Kuroko, Ruiko and Mikoto talking about Mii and Kurozuma Wataru's relationship, she also tell them that Mii has not been in Judgment for a while now and is not answering her phone. She later joins Mikoto, Ruiko and Kuroko to got to Mii's apartment, where they meet her roommate, Yanagisako Aomi who tells them about Mii's past as a member of Big Spider. She later leaves with them and then later listens to Ruiko's reply to Mikoto's statement about Mii's past.

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 seen doing 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. Uiharu is successful in breaking the code which allows Mikoto access to the Level 6 Shift Experiment details. It is unknown if Uiharu herself read the files.

At a later date, Uiharu, along with Saten Ruiko, is talking to Haruue Erii on her phone. Erii says she will join them later after stopping by the hospital. They meet up with Kuroko to help her with Mikoto. Learning that Mikoto has being busy recently and isn't talking to her, Ruiko concludes that Mikoto has boy problems which makes Uiharu blush. Later after hearing an alarm from a vending machine, Uiharu tries to go and assist Kuroko, who turns her down thinking that it is a false alarm.

Toaru Kagaku no Railgun: Uiharu SS
Published in a special booklet. Kazari stars with Yomikawa Aiho of Anti-Skill, where they try to stop a runaway tanker that is part of a terrorist plot.

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".
 * A character similar to her design appears in the 2nd chapter of Heavy Object a manga authored by Kamachi Kazuma, the creator of the Toaru Majutsu no Index series.