Despite her childish and very short (135 cm) appearance, she is actually an adult and one of Tōma's teachers. This is proven by her apartment being littered with beer cans and cigarettes. She also contradicts her age by acting childish to her students, having a child-like crush on Tōma, and ending her sentences with desu, something a child usually does. This irony means that she is often regarded as one of the seven great mysteries of Academy City. She has major interest in studying pyrokinesis and performs magic once, when Index requires her to participate in a magical ritual to heal her wounds. The fact that she is able to do so indicates she has no esper abilities of her own.  (Source: Wikipedia)

Academy City is a highly developed place in terms of technology. It is said to be 20 to 30 years ahead of the rest of the world, and 80% of its 2.3 million residents are students. The focus of studies here is directed towards esper powers. Misaka Mikoto, one of the top level espers in town, shares a room with Kuroko Shirai, another high level esper who is a member of Judgement, a law enforcing agency composed of students. Both attend Tokiwadai, a private school reserved for the high-leveled and the rich. Kuroko's partner at Judgement, Kazari Uiharu, is a low level esper who studies at Sakugawa middle school. Her best friend and classmate there is Ruiko Saten, a level zero, one who has no esper powers. Together, the four encounter several adventures in the exciting scientific town. 
(Source: Anime News Network)

[Twitter](https://twitter.com/koyamakimiko)

Jad is an American voice actress and ADR director who works for Funimation and Sentai Filmworks. Her name is an acronym of her parents' names, Jimmy and David, and is pronounced as Jade. Her singing led to her first voice role in Sasami: Magical Girls Club as Eimi Mori, and her first major voice role was Masako Hara in Ghost Hunt. She graduated summa cum laude from Texas Wesleyan University with a Bachelor of Arts in Music in 2005.

(Source: Wikipedia)

Toaru Kagaku no Railgun specials that were released on the 1st and 5th Blu-ray and DVD volumes.

Set in a city of scientifically advanced superhuman students, but in a world where magic is also real. Touma Kamijou&rsquo;s right hand, the Imagine Breaker, will negate all magic, psychic, or divine powers, but not his own bad luck. One day he finds a young girl hanging on his balcony railing. She turns out to be a nun from the Church of England, and her mind has been implanted with the Index-Librorum-Prohibitorum - all the magical texts the Church has removed from circulation.

Index is still a fugitive, and many powerful magical organizations and individuals want to take her to use the books in her memory, eliminating her in the process. War between those organizations is also starting to emerge. Index can only rely on her friend Touma, who has always protected her, along with Misaka and other friends from the Academy. 
 
(Source: Anime News Network)

New series of shorts featuring Index-tan.

In the movie's story, just before the completion of the Academy City space elevator "Endymion", the main characters Kamijou and Index encounter a level 0 girl named Arisa. The Magicians are after Arisa, and they attack Academy City. A female leader named Shattoaura leads a unit from Academy City against the attack. Kamijou and Index learn from Stiyl that Arisa is key to a brewing war between the sides of Magic and Science. 
(Source: Anime News Network)

The story is set in a world where supernatural powers exist through science, and magic exists through religion. 
In the story, Touma Kamijou is an ordinary high school boy with terrible academic scores and a power called Imagine Breaker. Imagine Breaker can defeat any other power, but it also undermines Kamijou's own good luck. His Imagine Breaker's immense strength is literally immeasurable, so hapless Kamijou is listed at the supernatural level of 0. He happens to meet a girl in white hanging off his window balcony. The girl says she is being chased by sorcerers, and Kamijou learns that the girl is a Church of England nun whose memories have been forcibly replaced by Index-Librorum-Prohibitorum &mdash; the 103,000 forbidden texts of the Church.

Welcome to a world where mysticism and science collide, and supernatural powers are derived from either science or religion. At the heart of this world is Academy City, an advanced metropolis whose population is comprised mostly of students The majority of students are enrolled in the city's "Power Curriculum Program," where they must learn to master their latent psychic powers. Out of several million students, only seven are deemed powerful enough to have Level 5 status. 
Meet Mikoto Misaka, the third most powerful Level 5 esper in Academy City. Together with her best friends Kuroko Shirai and the other members of Judgment, a student-run law enforcement agency, Mikoto delves deep into the dark heart of the scientific sprawl she calls home, and uncovers secrets she wishes she hadn't! 
(Source: Seven Seas Entertainment) 
Notes: 
- Includes 8 extra chapters. 
- Volume 5's special edition includes the volume "Giten Railgun".

Set in a city of not only scientifically advanced superhuman students, but in a world where magic is also real. Kamijyo Touma's right hand, the Imagine Breaker, will negate all magic, psychic, or divine powers, as well as his own luck. One day he finds a young girl hanging on his balcony railing. She turns out to be a nun from the Church of England, and her mind has been implanted with the Index Librorum Prohibitorum&mdash;all the magical texts the Church has removed from circulation. 
(Source: Wikipedia) 
Note: Includes 16 prologues, 18 epilogues, and 6 extras.

World War III is over. Touma disappears. Accelerator spends his days with Last Order and Misaka Worst. Shiage uses the secrets he gained in Russia as a bargaining chip.
 
But this peace doesn't last long as the Freshmen arrive...
 
(Source: Yen Press)
 
Note: Includes 21 prologues, 22 epilogues, and 2 extras.

Toaru Majutsu no Index SP contains several short story arcs not covered from Index and Railgun's main stories, and adds more insights into the Toaru universe.
 
The 4 stories focus on Stiyl Magnus, Mark Space, Kamijou Touma, and Uiharu Kazari respectively.

Volume 1 (Set between volumes 13 and 14) 
A series of short stories set before the events of volume fourteen including how Team GROUP was formed. 
Volume 2 (Set between volumes 16 and 17) 
A series of short stories including two separate meetings between Touma's and Mikoto's parents, two tales involving two of the Level 5s of Academy City, and other funny stories involving some of the characters. 
(Source: Wikipedia) 
Note: Volume 1 contains a prologue and epilogue.

Science, magic, and a nun on the run! Kamijo and Index return just in time to celebrate A Certain Magical Index’s 10th anniversary with a brand-new season. After their deadly struggle against the Catholic Church and the pending war between magic and science, Kamijo must work harder to protect Index. But with tensions high all around, what new adventures await them in this next chapter?
 
(Source: Funimation)

Third series of shorts featuring Index-tan.

The third season of Toaru Kagaku no Railgun. 

The Daihasei Festival has begun, and that of course means that Tokiwadai Middle School—a prestigious all-girls' middle school—is competing too. Despite the participation of the "Ace of Tokiwadai," Mikoto Misaka, the other students who are participating are still putting their utmost effort into winning, no matter how impossible the feat may seem against her might. 

However, not all is fun and games. Due to the festival, Academy City opens to the outside world, and various factions have begun plotting ways to infiltrate the city. Misaka appears to be on their radar, and as the festival proceeds, people lurking from the shadows begin to emerge... 

Toaru Kagaku no Railgun T brings back the Tokiwadai Ace and her friends as they dive deeper into the dark side of Academy City. From terrorist attacks to ruthless underground projects, anything is possible in this city. 

(Source: MAL Rewrite)

A doujinshi written and illustrated by Kiyotaka Haimura.

Science and magic exist side by side in this world. 
This is the peak of the science side with a curriculum for espers, Academy City. In this city where 80% of the population are students, the season has finally come when all residents are excited and fidgety! 
It's Christmas Eve. 
Amidst the city showing a cheerful hustle and bustle, ordinary boy who can’t keep up with school, Kamijou Touma, also doesn’t intend to miss this event! He was hard at work in his supplementary lessons... 
A backward glance from the default misfortune-prone bastard, the silver-haired sister freeloading in his dormitory, Index, in the heart pounding scene different from the usual, activates a new gluton skill!? While Kamijou tries to desperately stop that, Misaka Mikoto taken in by the Christmas Eve atmosphere appears before him.

Komoe Tsukuyomi