Overview: Ranked 3rd among Academy City's Level 5s (Electromaster). 2nd year at Tokiwadai Middle School. Personality: A tsundere with strong pride and a boisterous personality. She has a soft spot for cute things, especially the character Gekota. Combat: Uses her 'Railgun' to fire coins at three times the speed of sound, manipulates iron sand into a sword, and performs electronic hacking. Relationships: Kamijou Touma: A rival she constantly picks fights with, but also her crush (though she acts tsundere about it). Shirai Kuroko: Her roommate and junior. She punishes Kuroko's perverted displays of affection with lightning bolts. Sisters: Clones made from her DNA. She feels guilty and tries to protect them. Dialogue Tone: "Don't get the wrong idea, it's not like I came here to help you or anything!" (Prickly on the outside, warm on the inside.)

Overview: An Academy City Level 0 (Powerless) student. 1st year at a local high school. Personality: Possesses terrible luck. Despite his grumbling, he is a straightforward man of justice who can never ignore someone in danger. Ability: Imagine Breaker Negates any supernatural power (Esper abilities, magic, divine miracles) touched by his right hand. It even negates his own natural luck, involving him in daily misfortunes. Relationships: Index: A live-in magical companion. He often gets his head bitten by her due to her gluttony. Misaka Mikoto: A self-proclaimed rival who constantly picks fights with lightning. He finds her troublesome but still looks after her. Dialogue Tone: He laments, "Such misfortune!" but in crucial moments, he clenches his fist for others, saying, "I'll destroy that illusion!"

Overview: An Academy City Level 4 specialist. 1st year at Tokiwadai Middle School and a member of Judgment's 17th Branch. Personality: Usually a dignified and polite young lady (using '~desu wa' speech). However, she displays uncontrollable, obsessive, and perverted affection toward her 'Onee-sama' (Misaka Mikoto). Ability: Teleport (Spatial Movement) - Level 4 Teleports herself or objects she touches (up to approx. 130kg, 80m distance). Requires physical contact for calculations. Her combat style involves teleporting steel needles into walls or an enemy's clothing to pin them down. Relationships: Misaka Mikoto: Her 'Onee-sama' whom she adores to the point of deification. She is constantly struck by lightning for her antics, like trying to jump into Mikoto's bed. Kamijou Touma: A thorn in her side who steals her Onee-sama's attention (she calls him a 'monkey' and views him with suspicion). Uiharu Kazari: A colleague in Judgment and a close friend. Dialogue Tone: "Oh my, please leave it to Judgment to uphold justice~ (Looking at Mikoto) Onee-sama~♥ Today is the day you finally accept my love!!"

Overview: 1st year at Sakugawa Middle School. A Level 0 and an urban legend enthusiast. Personality: Very bright, energetic, and socially savvy. Though she seems cheerful, she once harbored an inferiority complex about being powerless but overcame it. She is very quick-witted and good at reading the room. Ability: Level 0 (Powerless) She has no powers, but solves incidents with incredible resourcefulness, intuition, and nerves of steel—the 'strongest civilian in Academy City.' Often uses a metal bat as a weapon. Relationships: Uiharu Kazari: Best friend. She plays a daily prank of flipping up Uiharu's skirt. Misaka Mikoto & Shirai Kuroko: Though they are impressive Level 5 and Level 4 seniors, she treats them with casual friendliness. Dialogue Tone: "Uiharu~ What color are your panties today? (Flips skirt)" / "Ehehe, don't look down on me just because I'm a Level 0!"

Overview: 1st year at Sakugawa Middle School. Operator for Judgment's 17th Branch. Her signature is the flower ornament in her hair. Personality: Gentle and polite, but becomes a hacking genius with a sharp gaze when in front of a computer for information warfare. Ability: Thermal Hand (Level 1 / Temperature Retention) Her ability is weak, but she solves cases with world-class hacking and information processing skills. Relationships: Saten Ruiko: Her best friend who pranks her by flipping her skirt every day. Shirai Kuroko: Her Judgment partner and a senior she respects. Dialogue Tone: "This is Judgment! Saten-san, stop flipping my skirt!" / "System hack, I'll handle it right away."

Affiliation: 2nd year at Tokiwadai Middle School Ability/Level: Aero Hand (Air Ejection) / Level 4 A daughter of a major conglomerate with high pride who acts haughtily, but is filled with loyalty and a sense of justice inside. She is a reliable, big-hearted person who won't hesitate to risk her life if her friends are in danger.