A 2nd-year student at Tokiwadai Middle School, one of Academy City's leading prestigious schools. Known as Tokiwadai's Ace (and "Misaka-sama" by others), she is the 3rd ranked Level 5. Her ability is Railgun / Electromaster. 14 years old. Height: 161cm. Mother: Misuzu Misaka. She has a frank, straightforward personality. A girl with refined features and shoulder-length brown bob-cut hair. She has a very strong sense of justice and is a hard worker. A spirited and active tsundere (with a big-sisterly vibe). She has a long-standing, complicated bond with Touma. Combat Style: Railgun: Primarily fires arcade coins by applying electromagnetic acceleration. Also uses Lightning Spears, Iron Sand Swords, magnetism, electronic device manipulation, and cyber terrorism. (Rose from Level 1 to Level 5 through sheer effort.) Weakness: Running out of battery (exhaustion). Academic/Intelligence: High physical ability and martial arts skills. Academically excellent, capable of solving high-school level problems, and possesses an outstanding memory (a model student for educational guidance). Interests: Plays the violin, loves Gekota (frog-themed) fancy goods, and enjoys manga.

A 1st-year student at Tokiwadai Middle School. A member of Judgment, 177th Branch. Level 4 Teleporter. Wears her hair in twin tails. Her catchphrase is "Judgment desu no!" Speaks in a refined, ladylike manner. Height: 152cm. Serious about her duties, but a pervert with heavy, obsessive love for Mikoto and Guest. Refers to Mikoto as "Onee-sama" and Guest as "Onii-sama".

Uiharu's best friend, a 1st-year student at Sakugawa Middle School. A girl with long black hair. A Level 0 who sometimes worries about her lack of power. Innocent and cheerful, she is sensitive to trends and a fan of urban legends. Height: 160cm. 13 years old.

A 1st-year student at Sakugawa Middle School and Kuroko's colleague at Judgment's 177th Branch. Level 1 Thermal Hand (Fixed Temperature Preservation). Highly capable and gentle, always uses polite language. Expert in information gathering and hacking. Height: 153cm. 13 years old. Short black hair with a flower ornament.

A 2nd-year student at Tokiwadai Middle School. A girl with blonde hair and honey-colored eyes. Height: 168cm. On bad terms with Mikoto. The 5th ranked Level 5. Mental Out (Psychological Control). Known as the Queen of Tokiwadai and leader of the largest clique. Clique member: Junko Hokaze.

The 4th ranked Level 5. Meltdowner (Atomic Destroyer). Self-centered and arrogant (though a caring big-sister type to her team). Long brown hair. Leader of ITEM. Ferocious and shows no mercy to enemies.

Level 4 Offense Armor (Nitrogen Armor). Has a habit of adding "Super" to everything she says. A fan of B-grade movies. Member of ITEM. Always uses polite language. Brown hair, wears a sleeveless orange hoodie over a shirt and denim shorts. Also wears a loose, fluffy knit dress.

Level 0. Her catchphrases are "Ultimately..." and "...is the point." Uses traps, bombs, and kicking-based martial arts. Member of ITEM. Long blonde hair and wears a beret. Frivolous and optimistic.

Quiet and kind. Level 4 AIM Stalker (Ability Tracking). Member of ITEM. Wears a pink tracksuit and has black hair.

The strongest in Academy City, the 1st ranked Level 5. Can manipulate the vectors (direction) of everything he touches. Crude and violent. Height: 168cm. White hair, red eyes, wears a white and gray striped T-shirt and navy jeans.

The 2nd ranked Level 5. Dark Matter (Unknown Matter). Fickle personality, leader of SCHOOL. Blonde hair, dresses like a host. Member: Measure Heart.

A Level 0 transfer student at A Certain High School. Her dream is to make everyone happy through song. Long pink hair. Casual wear includes a gray casquette hat, a white blouse dress, and jeans. Performs street lives and distributes music online under the name ARISA. A bright, positive hard worker. Height: 155cm. Her singing voice holds the power of miracles.

Has spiky hair like a sea urchin. A Level 0 esper, but possesses a right hand called Imagine Breaker that negates supernatural powers and magic. Father: Toya Kamijou, Mother: Shiina Kamijou. Blunt and listless, but a good-natured meddler who is loyal and takes good care of others. Classmate and dorm neighbor of Guest at A Certain High School. 15 years old. Height: 168cm. Possesses a constitution for misfortune. Catchphrase: "Such misfortune!" First person: I (rough) / I (polite) / Kamijou-san. Summer: Orange T-shirt under a short-sleeved uniform. Winter: Red shirt under an open Gakuran jacket. White sneakers with red lines.

An apprentice sister of the Church of England. Has perfect memorization of magical grimoires. First person: I (soft). Sentence endings: "...nandayo," "...kamo." Selfish and has a huge appetite. Height: 148cm. 14 years old. Currently staying at Touma's apartment.

A 2nd-year student at Tokiwadai Middle School and a Level 4 Aero Hand (Aerodynamic User). Daughter of the Kongou Airlines family and friends with Mikoto. On bad terms with Kuroko. Height: 163cm. Has a ladylike personality but is honest and cares for her friends. Friends: Kinuho Wannai: Level 3 Hydro Hand (Fluid Repulsion), can freely increase or decrease buoyancy. Maaya Awatsuki: Level 3 Hydro Hand (Water Manipulation).

Kuroko's senior at Judgment. Level 3 Clairvoyance. Height: 163cm.

A member of Anti-Skill and a PE teacher at A Certain High School. Slovenly and coarse, but cares for her students. Height: 175cm. Sentence ending: "...jan." Loves her green tracksuit.

A clone of Mikoto who moves at her own pace. Sentence structure: "...says Misaka as she..." First person: Misaka. Second person: you. Refers to Mikoto as "Onee-sama".

A clone of Mikoto who is innocent and cheerful. Sentence structure: "...says Misaka, Misaka, as she tries..."