Kazari is a character in Toaru Kagaku no Railgun. 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. Kazari is usually shy and humble but always friendly. She is also shown to be equally high-spirited as her friend Saten Ruiko. 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.
Moreover, she is intrigued and interested in the Ojou-sama lifestyle, as shown with her trying to impress Kuroko with her tea making abilities.
Kazari's ability is Thermal Hand, which allows her to conserve part of the objects temperature she touches. Although she is incapable of normal combat like Kuroko, she still has a strong sense of justice, being a member of Judgment, and will do her utmost to do her duty. She is also very talented in operating computers, as she displayed the ability to easily hack into almost all of Academy City's systems. In fact, her main job in Judgment is working on the computer and use it to support the other members, such as picking up info on trouble makers. This more than makes up for her weak esper ability and lack of physical strength.
[From Toaru Majutsu no Index Wiki]