Kuroko Shirai

Height: 152 cm (5'0")
Classification: Esper
School: Tokiwadai Middle School
Affiliation: Judgment
Esper Power: Teleport
Power Level: 4

Kuroko is Mikoto's kouhai in Tokiwadai Middle School and a protagonist in Toaru Kagaku no Railgun, as well as a supporting character in Toaru Majutsu no Index. A Level 4 psychic, she is a member of Judgment, a special public committee group whose duty is to maintain peace and order in Academy City. She has an unhealthy obsession with Mikoto, whom she calls "Onee-sama" (big sister), and is on the constant lookout for a chance to get physically intimate with her (and getting called a pervert in the process). She tends to get jealous if someone else gets her attention; this unfortunately happens to be Touma a lot of the time, since he has caught the attention of Mikoto for various reasons. However, it's been shown on few occasions that she is genuinely in love with Mikoto, even allowing herself to get severely hurt (see Tree Remnant arc) in order to help Mikoto.

She is classified as Mikoto Misaka's best friend. Her power is instant teleportation, which allows her to teleport herself and anything in her possession as long it weighs under around 130-137 kilograms to anywhere in a radius of around 81-85 meters. She generally carries a strap of needles around her leg that she can teleport to pin down enemies. One disadvantage of her power is that she has to concentrate on where she, the object(s), and/or person she holds would be teleported to, for any disturbance in her concentration will make her powers useless.