Toma Kamijo (上条 当麻, Kamijō Tōma) is a first-year high school student and a Level 0 esper, yet has an ability called "Imagine Breaker" (幻想殺し, Imajin Bureikā, lit.
"Super Electromagnetic Cannon") which allows her to produce one billion volts of electricity, making her the most powerful Electromaster in Academy City.
"Automatic Writing") which allows her to cast high-class magic attacks such as St. George's Sanctuary (聖ジョージの聖域, Seinto Jōji no Seīki) and Dragon's Breath (竜王の殺息, Doragon Buresu, lit.
Her vast knowledge of the Index Librorum Prohibitorum within her mind makes her one of the most powerful characters so far and becomes helpful to her friends in various situations like using Spell Intercept (強制詠唱 (スペルインターセプト), Superu Intāseputo, lit.
When she returns to England, Index is sought out by Fiamma of the Right, who wants her knowledge, and is reactivated in her John's Pen mode by her remote control magical item.
She later joins Toma, Accelerator, Shiage Hamazura, Rikō Takitsubo, and Aleister Crowley during the latter's invasion of London, where she learns another grimoire for a total of 103,001.
"Spatial Movement") which allows her to teleport herself or objects she touches under a total weight of around 130–137 kilograms (287–302 lb) to anywhere within a radius of around 81–85 metres (266–279 ft), but her ability it requires an amount of concentration for successful execution.
Kuroko has an obsessive and perverted crush on Mikoto, whom she addresses as "Onē-sama" (おねえさま, revered big sister) or "Sissy" in the anime series' English dub.
Kuroko officially debuts in the eighth volume of A Certain Magical Index when she investigates a robbery of the remnants of the Tree Diagram and discovers Mikoto's involvement in the incident.
Accelerator's unique ability makes him the subject of an experiment attempting to create the first Level 6 esper, in which according to the city's best supercomputer known as the Tree Diagram (which is destroyed by Index's Dragon Breath), this feat can only be achieved by killing Misaka Mikoto 128 times without a single failure.
The fifth volume reveals his past where he is taken to Academy City at a young age after his ability was first discovered but because of the lack of understanding, people fear him and in some cases attempt to kill him.
In the aftermath of the incident, Accelerator is shot in the head by Ao Amai and acquires aphasia due to brain damage.
After Accelerator is defeated again, Toma uses his Imagine Breaker to stabilize Last Order and leaves a note informing him of Index's true whereabouts.
He is a former member of Skill-Out, a group of Level 0s who use various means to counter esper abilities, who accidentally gets caught up with the Dark Side of Academy City.
Humiliated, he left the gang to his friend Hattori Hanzo and became a chauffeur and informant for Team ITEM where he fell in love with one of their members, Rikō Takitsubo.
During the 15th novel, Team ITEM is involved in a war between the various underground organization where Shiage helps them by providing transport by stealing cars around the city.
Seeing him as an unpredictable anomaly that will disrupt his future plans, Aleister puts a bounty on Shiage and orders the forces of Academy City's dark side to kill him.
Ironically, he is saved by Shizuri, who survived their battle and now has a sense of twisted love for him (declaring she will castrate him as her sign of affection).
In order to protect a document called the Kremlin Report, Shiage and Rikō head towards the same nuclear military base that Mikoto went to while they were being chased by Academy City forces and later Shizuri.
He is Academy City's second most powerful Level 5 esper with an ability called "Dark Matter" (未元物質, Dāku Mat, lit.
He later sparks a revolution by orchestrating an assassination attempt on Monaka Oyafune to disrupt the security in Elementary Particle Engineering Laboratory that houses the Tweezers.
Teitoku plans on using it to grab a minuscule machine called "UNDER_LINE" that serves as Aleister's sole method of collecting information while inside the Windowless Building, helping him contact the Board Chairman.
Misaki Shokuhō (食蜂 操祈) is a second-year student who led the largest clique in the school, earning her the title "The Queen of Tokiwadai".
Misaki is involved in the Exterior Project that would greatly boost her power by cultivating a cut portion of her brain's cerebral cortex.
Misaki's backstory makes a debut in the eleventh volume of New Testament: A Certain Magical Index light novel series when she bumped into Tōma for the first time at an intersection road during her early days as a first-year student.
Their meeting is short-lived when Misaki was targeted by an organization called "Deadlock", causing Tōma to get badly injured after he protected her from their attacks using his body.
In the Ichihanaran Festival story arc, Misaki prevents Mikoto Misaka from taking a trial enrollment in Tōma's high school by making mind-controlled individuals chase after her.
Misaki is last seen in a hospital where she was confined because of the injuries she sustained from her fight against Anna Sprengel to acquire the vaccine for a dying Tōma.