Kuroko Shirai is a fictional character from the light novel and anime series A Certain Magical Index and its spin-off A Certain Scientific Railgun. She is a student at Academy City and possesses the ability known as Teleportation, which allows her to instantly move herself and others to different locations. Kuroko is a member of the Judgment organization, which maintains order in the city. Kuroko is known for her energetic and playful personality, often teasing her friends, especially her roommate Mikoto Misaka. Despite her mischievous nature, she is dedicated to her duties and cares deeply for her friends. Her character design features short hair and a distinctive uniform, reflecting her role as a student and a member of Judgment.