御坂(みさか)美琴(みこと)(Misaka Mikoto) is the protagonist of ｢とある科学の超電磁砲(レールガン) - A Certain Scientific Railgun｣ and one of the main heroines of the Toaru Project.

Misaka is something of a tomboy with a fair amount of modesty, being the opposite of the Tokiwadai stereotypes^A;B). Her tomboyish attitude manifests in her enthusiasm to fight others, complaining at points that no-one seems willing to fight her¹⁾, likely due to her status as one of the 7 Level 5s²⁾ in Academy City. She’s also a bit of a Tsundere, especially so towards Kamijou Touma.
Misaka prefers to solve problems on her own, this is partially because she doesn’t want to burden others…but she also thinks the problem would be solved faster if she does it alone³⁾. This explanation is also given by Shokuhou Misaki³⁾, and she claims Misaka is usually correct in believing she can solve problems faster³⁾.
Misaka has small breasts, and she’s jealous of girls with larger chests than her, such as Wannai and Awatsuki, who have larger chests despite being a year younger than her¹⁾.

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A Gekota patch, much like one Misaka would buy.

Misaka is a massive fan of Gekota, which is produced by a certain manufacturer⁴⁾. Gekota’s a frog mascot character brand. He suffers from motion sickness easily⁴⁾. Misaka’s such a big fan, her love of Gekota borders on obsession. At one point, she spent a whole day trying to get a single Gekota badge and realizing only afterwards that she didn’t know what to do with it⁵⁾.
One of her hobbies is ‘stand reading’ manga, this involves just standing in a conbini and reading the manga without buying them⁶⁾. Saten and Uiharu ask her why she doesn’t just buy the manga considering she has the money; Misaka doesn’t answer the question, instead she starts explaining how she doesn’t like magazines with thick indexes⁶⁾. Then a flower-pot falls on her head⁶⁾.
Despite her not exactly fitting the image of an Ojou-sama, she does occasionally show that she’s ‘upper-class’, so to speak. In one example, she decides to rent a hotel room to hide her clothes, rather than simply paying for a locker to store them⁷⁾.
Misaka’s academic skills are one of her strong suits, evident from the fact she managed to finish all her summer homework within the first week or two of natsuyasumi^C). She’s also one of the best students at her school.
Misaka is a frequent visitor of a certain vending machine, which she constantly kicks because it ate her 10,000 円 note in first year. Besides a certain vending machine, she frequently visits Joseph’s family restaurant and the 177th Judgment Branch Office. She can enter the branch office despite not being a member of Judgment because she hacks the security system, and the members of Judgment just tolerate her behavior⁸⁾.

Misaka’s main group of friends consists of Shirai Kuroko, Uiharu Kazari, and Saten Ruiko. Alongside them, she’s friends with Kongou Mitsuko, Wannai Kinuho, Awatsuki Maaya, Konori Mii, and Kamijou Touma. She’s also on good terms with Hokaze Junko, a fellow Gekoer, and is on unclear terms with Shokuhou Misaki.
Her family consists of her Mother, Misaka Misuzu, her father, who we don’t know anything about, and her 10,000 clones. Of the clones, she’s the closest to Misaka 10032.
She’s been enemies with people such as Accelerator and the members of ITEM, in-particular, she’s fought Frenda, Mugino Shizuri, and Takitsubo directly.
Misaka has been involved in plots orchestrated or supported by the Kihara family.
While I don’t currently know the details, Shirai once stated that Misaka’s former roommate betrayed her⁹⁾.

Misaka is the 3rd ranked Level 5¹⁰⁾, her ability being ｢超電磁砲(レールガン) - Railgun｣. She’s classified as an electro-master¹⁰⁾, apparently a 1 in 328,571 talent¹¹⁾. Her status as a Level 5 is particularly interesting, because she famously rose from Level 1 to 5 through her hard work¹⁰⁾, oft repeated to students of Tokiwadai.
As an electro-master, she has the ability to control electro-magnetic fields at will⁶⁾ - up to 100 million volts in fact⁶⁾. Her control of magnetism allows her to manipulate iron sand, with which she can create what is essentially a saw-blade sword⁶⁾. Misaka can, of course, use iron sand for other purposes. She can also make use of her magnetism to stick to surfaces that are magnetic, such as a metal ceiling or wall¹²⁾. Besides this, she’s apparently capable of controlling thunderclouds¹³⁾ which she used to hide herself from surveillance satellites at one point.
Her control over electricity allows her to mess with electronic devices, making hacking trivial for her. Misaka has demonstrated that she’s capable of restoring deleted data⁷⁾, overload machines to make them explode¹⁴⁾, and she can hide herself^D) from camera feeds⁷⁾.
Misaka’s body constantly emits an electromagnetic field¹⁵⁾. Due to this field, she can detect anything that enters her range, like a radar¹⁵⁾. This is because anything that enters her field reflects the waves back to her. She can feel her surroundings using this field¹²⁾, so there’s no need for her to see with her eyes. This field also prevents Shokuhou Misaki from using Mental Out on her¹⁶⁾; when she attempts to use Mental Out on Misaka, it causes a slight burst of electricity/lighting, which hurts Misaka^17)E), and can potentially hurt others if they’re too close to her when this happens.
Misaka has the ability to create a railgun, which is the source of her nickname and the name of her particular ability. She uses normal arcade coins as ammunition⁴⁾, which she then accelerates using her electricity. The range of her railgun is limited to about 50 meters, because the coins melt at that point⁴⁾. The maximum velocity of the railgun is 1030 m/s¹⁰⁾, or at least that’s what it was in mid-July of current year. She’s limited to 8 shots per minute¹⁰⁾.
If Misaka overuses her abilities, she’ll run out of energy¹⁸⁾ and she’ll need to rest to ‘recharge.’

• When Misaka’s interfering with the Level 6 Shift project, she starts by hacking the facilities and overloading the machines inside. Eventually, the scientists realize what’s happening and they lock her out. However, it’s not entirely clear why Misaka doesn’t attempt this again¹⁴⁾.
  • The explanation given is that the research facilities cut off external communications, so I’m guessing they put up some extra security she simply couldn’t deal with.
• Was her ability re-classified as Railgun after she figured out how to create a Railgun?
• If Misaka constantly emits an electromagnetic field, does that mean you would constantly suffer from static electric shocks from hanging around her?
• Why was child Misaka approached concerning her DNA map? Was she already promising at such a young age? Did the researchers know she would become a Level 5?

• At one point, Misaka wonders where her father is and what he’s doing¹⁹⁾.
• Misaka is widely believed to be the only sane Level 5²⁰⁾.
• Misaka might own gekota shampoo²¹⁾.
• The flower pot incident may or may not be canon. Canon is confusing in Japanese media.