Nunotaba Shinobu

Nunotaba Shinobu (布束 砥信) is a third year student in Academy City character that was introduced in the Toaru Kagaku no Railgun sidestory. She is a child prodigy and was the one who supervise the operation of Testament machines for the use of the Sisters Project. She is the first person Mikoto meets that is directly involved with the project, and her discovery set-off a chain reaction of events that consisted the Sisters Arc.

Appearance
She is a girl with an average looking build. Her most prominent feature is her unkempt hair and her wide-eyed expression, which Mikoto class "fish-eyes". She also seems to prefer gothic lolita clothes, when she is not wearing her uniform or lab coat.

In the Toaru Kagaku no Railgun S anime, Shinobu loses her trademark fish-eyes.

Personality
Not much is known, but she seems to exude an air of aloofness. She is calm as shown during during the attack of the Skill-Outs and thinks of things highly objectively, after lecturing Mikoto on how to the scientist in the experiments doesn't see anything wrong with using clones as test subjects. Her aloof nature makes her hard to approach and can be seen as advantage to her to intimidate opponents with along with her appearance.

She however shows cares somewhat for people, during Kinuhata Saiai's attack on her, she refused to hit her vital spots using a gun and even tried her best not to shoot it. This care for people, is shown greatly towards the clones after seeing them as human, she tries in her own way to stop them from being used for experiments any longer.

Background
Not much is known about her past, though it is confirmed that she was already a child prodigy at a very young age in the field of biopsychology. She was hired by the 7th Medical Research Center as the supervisor for inputting intracerebral information on the Mikoto clones using Testament. She left the institute after it was that there was a flaw in the first production plan for the clones as they could not reach the level of Misaka Mikoto. She continued her studies in Nagatenjouki Academy. She was however called back for the 2nd production plan, as the sisters were reused for the Level 6 Shift.

Although, originally thinking of the clones as human guinea pigs, she changed her ways after having a conversation with a clone who who wanted to see the outside, realizing that the clone were not guinea pigs but human all along. She opted to quit and decided to stop the experiments.

Using a large quantity of money, she distributed bank cards in Academy City blind spots like alleyways, were the experiments with the Sisters will probably take place. Though, this only to slightly hinder project until she is able to re-infiltrate the project and integrate emotions to the clones that would make the people involved in the experiments reevaluate the clones' humanity.

Sisters Arc

 * Main article: Sisters Arc

She first appears in the Sisters Arc, where she is seen in her hideout by Mikoto being attacked by Skill-out members who wanted money from her as she was the one who was distributing the cash cards that were distributed in Academy City. However, using her abilities as well as good acting and intimidation, she was able to cause a mental breakdown on them and defeat them. This impressed Mikoto who was watching her. Through Shinobu, Mikoto was able to discover that there is something behind the rumors of her clones. Mikoto tries to squeeze answers from Shinobu, but is repelled and is told that Mikoto cannot do anything with her powers even when she tried. She explains to Mikoto the reason she is distributing cash cards in Academy City's blindspots, so it can be filled by humans and as such the experiments cannot be performed without revealing the experiments to eyewitnesses. Shinobu, now having her hideout compromised, tries to destroy the evidence as well as her hideout (including the Skill-outs that were unconscious) by burning them. She quickly leaves the premises, leaving Mikoto to haul out the Skill-outs.

Shinobu is later seen after Mikoto witnesses the death of Misaka 9982 in the hands of Accelerator, as part of the experiment. She notices Mikoto has witnessed how is the experiment and tells her that a time ago she has stopped thinking of the clones as mere guinea pigs, and believe them to be truly human that deserve to live. Shinobu asks Mikoto what she thinks of the clones, to which she replies that she doesn't see them as humans, and tells her that this is her problem as they are using his DNA Map for the experiments. Shinobu tells Mikoto that she is not really being honest with herself, and tells her that is Mikoto really intends to do it alone, to which Mikoto answers her with a rhetorical question: Just who do you think I am?

She is last seen being invited by the S-Processor Company, during Mikoto's attack on one of its laboratories. Though she seemed to have been well aware of their plans of using her as a scapegoat. Shinobu takes advantage of the relocation of data to another facility during Mikoto's attacks and plans to install an emotion program into the Sisters. Here, she states that she in unsure that the program will be halted because of this, however, her program should at least show the clones that there is another path than death. Here, she hopes that the clones would feel the despair of death, and make the researchers, that they are not simply lab rats but humans, she also hopes though highly unlikely, the clones pleas for the experiments would move the heart of the Accelerator.

Shinobu is then attacked by Kinuhata Saiai and her lackeys, telling her that Mugino Shizuri predicted that Mikoto's attack might be used as a diversion and confirming that the room Shinobu was in was off-limits. During her struggle with Saiai, Shinobu asks herself if the clones could ever hope to live a normal even if her plan works, she however becomes resolute after remembering Mikoto. She successfully installs her program just before Saiai could destroy it. However, her plan fails as the program was not relayed into the entire Misaka Network, unbeknownst to her due to the interference of Misaka 20001, Last Order. Before finally being detained, Shinobu attacks one of the thugs holding her and steals his gun and points it towards Saiai. She asks Saiai to pull back or else she will shoot (which she is reluctant on doing), however, intimidates her into shooting, though only the shoulder. Shinobu soon realizes that Saiai is unharmed by the gunshot.

Shinobu is later detained and carried away by the thugs, where Saiai indicates that Shinobu will not be killed if she is still has any use, however, Saiai states that she'll probably lose everything and may have a terrible future awaiting her. Shinobu's whereabouts are currently unknown.

Abilities
She does not have any powers, but uses good acting to invoke fear into enemies and make them believe she has a deadly one.

In fact, she referred to her 'powers' as Critical (寿命中断(クリティカル)), a power which, according to her, can be used only on opponents she has touched, though this maybe a simple lie by her. This falsehood is driven home in the Toaru Kagaku no Railgun S anime, where instead of defeating the Skill-Out thugs after her through simple terror brought out by her good acting, she uses an anesthetic as well.

Quotes

 * (To Mikoto in Railgun Chapter 25)"You're not being very honest now, huh? There's more than 20 facilities involved in this. Do you intend to do this alone?"
 * (Internal monologue from Railgun Chapter 28)"Amongst the 'Sisters' who accept death as if it was nothing, there might appear those who grieve that cruel fate. Seeing that, there might appear a researcher who begins to acknowledge them as more than lab rats. And the least likely: A plea from them for the fighting to stop... Just might move someone's heart."