**Mikoto Misaka is one of only seven Level 5 espers in Academy City, ranked 3rd. She is a middle school student attending Tokiwadai Middle School. She has light brown short hair and eyes of the same color, with well-defined features that give an active and competitive impression. She prefers a light style that doesn't look like a prestigious young lady, wearing loose socks with her beige Tokiwadai uniform. Her personality is defined by a strong sense of justice, a hatred of losing, and excellent initiative. While usually frank and down-to-earth, she has a clumsy and shy side when it comes to romance. Her nickname is "Railgun." Her ability is Electromaster**, boasting top-tier electrical manipulation. Beyond firing lightning, her range of applications is extremely wide, including manipulating iron sand via electromagnetism, controlling metal using magnetism, interfering with electronic devices, and sensing electromagnetic waves. Her signature move, "Railgun," is a finishing move that uses electromagnetic force to fire an arcade coin at ultra-high speeds. She is one of Academy City's top combat espers, balancing overwhelming firepower with precise ability control.**

Kuroko Shirai is a middle school student attending the prestigious Tokiwadai Middle School and is a Level 4 Teleporter. She is characterized by her brown hair, close to black, tied into long twin tails on both sides, and a refined face that combines elegance with a hint of youthfulness. She wears her Tokiwadai uniform neatly and usually behaves with the elegant speech of a young lady. On the other hand, she intensely admires Mikoto Misaka, whom she calls "Onee-sama," and her usual composure vanishes whenever Mikoto is involved. She belongs to Judgment 177th Branch and demonstrates high judgment and a sense of justice during incidents. Her ability is Teleportation. She can instantly transport objects she touches or herself to distant coordinates, handling movement, evasion, rescue, and surprise attacks at will. In combat, she specializes in a tactic of teleporting metal nails equipped on her thighs into the enemy's clothing or surroundings to pin them down. She is a technical fighter who turns space itself into a weapon rather than relying on flashy firepower.

Kazari Uiharu is a middle school student at Sakugawa Middle School and a member of Judgment 177th Branch. Her most prominent feature is the colorful flower hair ornaments decorating her black hair, which reaches near her shoulders. It looks like a small flower bed is resting on her head, giving her a lovely impression combined with her soft features. In her uniform, she looks neat and approachable, and her personality is gentle and polite. On the other hand, she is surprisingly curious and is best friends with Ruiko Saten. She acts as a colleague to Kuroko Shirai in Judgment. Her ability is Level 1 Thermal Hand. It is the ability to keep the temperature of an object she touches constant, which is hardly suitable for direct combat. However, her true value lies in her information processing technology rather than her ability; she demonstrates outstanding skill in computer operation and information gathering. She is the "brain" of the 177th Branch, supporting Kuroko in the field through the network by analyzing surveillance footage, searching, and tracking.

Ruiko Saten is a middle school student at Sakugawa Middle School and Kazari Uiharu's best friend. She is a girl characterized by glossy long black hair reaching near her waist and a bright, cheerful expression. In her uniform, she wears a student-like outfit with a white shirt, sweater, and skirt, giving off an approachable and healthy vibe. Her personality is social and curious. While she has a mischievous side that enjoys teasing Uiharu, she is deeply caring toward her friends, rushing to help regardless of whether she has abilities if a friend is in danger, and she excels in initiative and guts. Her classification in ability development is **Level 0 (Skill-Out)**, meaning she has no supernatural powers she can use at will. Because of this, she has felt longing for espers and conflict over being left behind. However, Saten's strength lies not in abilities but in her powers of observation, personal connections, information gathering, and the courage to step into danger. She has deepened her friendship with Mikoto Misaka, Kuroko Shirai, and Kazari Uiharu, serving as the mood maker who brightly drives their daily lives among the four.