Kuroko Shirai is a Level 4 teleportation esper in Academy City, able to relocate herself or objects within an 81.5-meter radius under a 130.7-kilogram weight limit. Her power demands meticulous focus, failing under distraction. Combat-ready, she wields metal spikes strapped to her thighs, teleporting them precisely to disable foes. Initially unable to teleport herself before joining Tokiwadai Middle School, she later mastered self-teleportation through rigorous training. As a Judgment member, she upholds order alongside colleagues like Uiharu Kazari. Her family oversees White Spring Holdings, a convenience store chain reflecting the "white" in her surname Shirai (白井), while her given name Kuroko (黒子) alludes to "black" and the unseen stagehands of traditional theater—a duality echoed in her character song *Desu no! White & Black* and narrative nods like a shadowy doppelgänger in *Toaru Majutsu no Index-tan*. Raised in Academy City’s tech-driven society, Kuroko balances modern pragmatism with fierce loyalty. She finds traditional customs like the "love umbrella" baffling and distrusts external technology. Bluntly vocal, she often clashes with peers yet prioritizes civilian safety above all. Her comedic infatuation with Misaka Mikoto—addressed as "Onee-sama"—masks genuine devotion, enduring Mikoto’s electric rebuffs while covertly shielding her. This resolve is tested in the Tree Diagram Remnant Arc, where she confronts teleporter Musujime Awaki, sustaining injuries that leave her temporarily wheelchair-bound but deepening her determination to strengthen her abilities. Her growth unfolds across key events: aiding Mikoto during the Daihasei Festival while recovering, then collaborating with Anti-Skill in *Genesis Testament*’s Operation Handcuffs to dismantle criminal networks. She allies with figures like Touma Kamijo to address city-wide threats, balancing stern Judgment duties with unexpected nurturing instincts toward children. Kuroko’s speech is marked by the distinctive suffix "desu no," replacing standard sentence endings, and her trademark "Judgment desu no!" declaration. Visually, she sports tawny twin-tails with red ribbons, the Tokiwadai uniform, and a Judgment armband—a design requiring minimal adjustments in manga adaptations per illustrator notes. Beyond her core narrative, she appears as a bride candidate in *Ookami-san and Her Seven Companions*, voiced by her original actress, and battles in *Dengeki Bunko Fighting Climax: Ignition*, blending teleportation and martial arts in gameplay.