She is a Misaka Mikoto clone that appears in both Toaru Majutsu no Index and Toaru Kagaku no Railgun. Originally having a small role in Toaru Majutsu no Index, her character was later expanded in Toaru Kagaku no Railgun. She is the 10031st clone to be produced and killed by Accelerator for the Level 6 Shift experiment, she is also the first clone Kamijou Touma meets.   She looks the same as Mikoto, although for emphasis her eyes are drawn in a different way. Goggles and blue-striped panties are common to all Misaka clones and Misaka 10031 is no exception to this.   She has the same personality as most clones, with emotions that have been surpressed as they weren't beneficial to the experiment. Despite this, she still feels pain and is hurt when Mikoto drove her away when she tried to cheer her up, because of this she was a little saddened.  Another slight hint of personality is shown when behaves seriously when confronting Mikoto and Touma about having "robbed" a vending machine, she seriously recited every legal article that the couple ignored while committing the "felony", expressing dissappointment on them for engaging in such activities. Unfortunately 10031's nagging was cut short by Mikoto's aggressive personality which dragged her out of the scene to question her about the situation.   She is killed by Accelerator, and her remains are cleaned up by MISAKA 10032.

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.

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Birth name: Nozomi (望) Sasaki (佐々木)     About:  Changed her name to all-hiragana form because the kanji of her birth name was exactly the same as voice actor Nozomu Sasaki's (望 can be pronounced either as "Nozomu" or "Nozomi").

The second season of Toaru Kagaku no Railgun. 
 
Something sinister is going on in Academy City. The shadows are filled with whispers of an organization cloning super-powered students known as espers. High-ranking master of electricity, Mikoto Misaka, laughs off these stories until she comes face to face with a copy of herself. After learning that these clones - her sisters - are being systematically murdered in a series of experiments designed to turn a sadistic killer into the strongest esper in history, Misaka vows to save her copies and destroy the organization responsible for the project. 
 
As Misaka prepares to face off against the organization’s power-hungry esper, she discovers that she wasn’t the only victim of the scientific forces conspiring within the city - and that’s something Misaka and the girls of Judgement simply won’t stand for. 
 
(Source: Funimation)

Brittney Marie Karbowski is an American voice actress who has voiced in a number of English-language versions of Japanese anime series for ADV Films, Funimation and Sentai Filmworks, most notably, Black Star in Soul Eater. She also voices as Wendy Marvell in Fairy Tail, Mikoto Misaka in A Certain Magical Index and its spinoff, A Certain Scientific Railgun, and Yuri Nakamura in Angel Beats!.

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.

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".

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.

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

MISAKA 10031