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This is the page for the primary four characters of the A Certain Magical Index spinoff A Certain Scientific Railgun.

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    Mikoto Misaka 

Mikoto Misaka

The Railgun/The Ace of Tokiwadai/The Electric Princess
Voiced by: Rina Sato (Japanese) and Brittney Karbowski (English)

Mikoto, also known as "Biri-Biri"/"Bug-Zapper", is the main female Science-oriented protagonist of the Index universe and near-eponymous protagonist of her own spinoff, A Certain Scientific Railgun. Her power is Electromaster, and with it she is the third most powerful Level 5, the highest rank attainable for an Esper. Has a love/hate relationship with Touma.

  • Accidental Misnaming: Is rather annoyed that Touma keeps calling her "Biri-Biri" and kept telling him it's not her name. In the epilogue of the Sisters Arc, after she fails to give him her homemade cookies, she once again insists on him using her real name, to which he finally does indeed say it. Although the audience can't see, Kuroko mentioned that she had never seen that expression on her face before.
  • A-Cup Angst: It does not help that some of Academy City's younger girls are better endowed than she is. And it's hinted that Misuzu (who's well endowed herself, also to her daughter's chagrin) wants to rectify this fast (through food). Considering she's no more than fourteen, one would have to wonder why she's so bothered about it. This is again Played for Laughs during her first meeting with Misaka WORST. Due to WORST being an age-accelerated clone of Mikoto, this should mean that Mikoto will (literally) grow out of this, but WORST trolls her about it, noting that she was grown using different hormones, and thus there's no guarantee that the others will reach her proportions.
  • The Ace: She's known by the public as "The Ace of Tokiwadai", and she backs it up by being one of Academy City's most powerful espers, a straight-A student, and an excellent athlete.
  • Action Girl: She has slightly violent tendencies, and is ranked third among the Level 5 Espers.
  • Alliterative Name: Mikoto Misaka
  • All-Loving Heroine: Sort of becomes one in the anime-exclusive arc in Railgun S.
  • Almighty Idiot: Gensei infects the Misaka Network and forces it into her to start a transformation to Level 6. Mikoto takes on an angelic form and becomes astronomically more powerful, but she's barely aware of what's going on around her or even who she is anymore. According to Gensei, it's because in her current stage of development she cannot become a "stable" Level 6 like Accelerator, and notes that by the time she's little over halfway-there with this forced Shift her human self will all but fade away.
  • Ambiguously Brown: Her skin is notably a slightly darker tone than her friends.
  • Armor-Piercing Slap: Subverted. Try as she might, Mikoto just cannot get a hit in on Touma.
  • Ascend to a Higher Plane of Existence: Gensei co-opts Exterior and the Misaka Network to forcibly induce a level 6 shift on her, which basically means becoming an angel. However, while Accelerator could hit level 6 and retain his mind and body and Kakine has a chance of doing the same, in her current state Mikoto would lose her personality when she was halfway there and would self destruct when reached full power and tried to ascend, since there's no more room in Heaven for any more angels.
  • Ax-Crazy: In Episode 4 of Railgun against Touma.
  • Badass Adorable: She looks cute and innocent, which causes a lot of guys to hit on her. Unfortunately for them, she's also one of the strongest people in the city and has one of the most flexible powers in the entire story.
  • Badass in a Nice Suit: During the Daihaseisai Arc, when she and Misaki team up to raid the compound where Gensei Kihara is she dons the private security force's uniform and sunglasses, as unlike Misaki who can just alter everyone's memories to make it so that she was never there, Misaka needs the change of clothes to help hide her identity.
  • Batman Can Breathe in Space: In the Railgun S season finale, she and Kuroko were launched to the edge of the atmosphere without suits. While seemingly unaffected by the vacuum, they were visibly choking before they made it back to Earth.
  • Belligerent Sexual Tension: Touma is the only one that can bring out her true tsundere side, though Kuroko's attempts to molest her are annoying enough to get similar results. It takes her around 15 novels to even realize and admit the reason for her behavior.
  • Berserk Button: There are only two things that make her angry enough nearby objects start sparking: threats to the Sisters, and Touma.
  • Big Damn Heroes: Twice to Lessar in the second Railgun SS.
  • Big Sister Instinct: Loves the Sisters as though they really are her siblings, and would go to hell and back to protect them. Which is exploited by Gensei Kihara.
  • Blessed with Suck: Her powers allow her to take on entire military factions on her lonesome, but she also has trouble interacting with animals since they can feel the electromagnetic field she gives off and instinctively run away from her.
  • Blood Knight: Though more from her inability to forgive slights than actual bloodlust, because she will forgive you after pounding your ass in.
  • Blush Sticker: At times, especially as a child, if Last Order is any proof.
  • Brainy Brunette: She can think faster than a supercomputer and is definitely a brunette.
  • Breaking the Fourth Wall: Once in New Testament Volume 2.
    "If she let him get away, things would get very bad."
    "To put it in concrete terms, it was possible that she would end up with no scenes for three whole volumes."
    "Wait! Wait just a second!! This is my scene! If you’re going to do this, do it later!! Dammit, the guy-to-girl ratio here is completely out of balance. And is that group of huge breasts specifically targeted at me!? A-at this rate, I’ll be lost in the background…!! Did they create a forest to hide a leaf!?"
  • Breakout Character: She started as just another Girl of the Week, but proved so popular that she began to both appear more frequently, though still had little effect on the plot until World War III. She muscled her way into the story proper during the start of the New Testament novels and even got her own spinoff which has proven at least as popular as the main series.
  • Break the Cutie: During the Sisters Arc, resulting in a Heroic BSoD.
  • Break the Haughty: A lot of Misaka's early hostility towards Touma boils down to him knocking her down a couple of pegs. She starts of the story as something of a Smug Super, but then when she challenges Touma to a fight, not only does he nullify all of her attacks, but she also almost starts crying when he's about to strike. Touma subsequently throwing the fight after only serves to piss Misaka off.
  • Brought Down to Badass: During the Sisters arc, she's been going around trashing facilities for several days without eating or sleeping and is completely exhausted. After using the last of her energy to fight off Frenda, she's pitted into combat with Mugino and manages to use Frenda's explosives, a few passive effects of her electromaster powers and knowledge of the facility to bring Mugino down without enough power to use a single electric attack.
  • Cannot Spit It Out: To Touma.
  • Celestial Body: The final form she reaches of her Level 6 Shift turns her head down to her collarbones pitch-black with glowing lights that resemble a starry-night sky.
  • Character Development: Her primary flaw in the early series is pride; as one of the most powerful espers in the city, it's hard for her to even consider that there might be things she can't do and needs help with. As the series progresses, she evolves into a character more capable of accepting support from others and trusting people (especially Touma) to be able to solve problems on their own.
    • However she starts to backslide harshly later on in New Testament after she gets more involved with the actual ongoing world conflicts. The fact is that despite her great prowess and power, she just is nowhere in the league of outright Magic Gods (To wit, not even No. 1 esper Accelerator comes close to that level). Her sin of pride ends up switching from "not needing any help" to "being absolutely frustrated she cannot truly help Touma" despite his protestations to the latter. This leads her to the Anti-Art Attachment and going down a potentially dark path in order to finally catch up.
  • Chronic Hero Syndrome: Despite Kuroko constantly warning her that since she is a civilian, she should leave the heroics to Judgment or Anti-Skill, she just can't help jumping in and helping. Ironically, Mikoto can't understand why Touma does the same thing.
  • Clingy Jealous Girl: Although it doesn't pop up too often, she's not too fond of how close Index is to Touma. And when he's seen hanging out with one of the Misaka sisters in episode 18 of season 2's A Certain Magical Index, she gets angry with him.
  • Cloning Blues: The Sisters.
  • Code Name: See above.
  • Cool Big Sis: Acts like this, especially in the Railgun series. Less so in the main series, since she hangs out a lot more with Touma who brings out her Tsundere side.
  • Cry Cute: Breaks down crying while she cradles a hideously injured Touma in her lap after brutally electrocuting him, realizing his point about the futility of trying to fight Accelerator to the death, noting how it will ultimately solve nothing.
  • Cunning Linguist: Besides Japanese, she knows other languages like English, French, and Russian. It comes in handy when communicating with the French-speaking Cendrillon.
  • Cuteness Proximity: Frogs, especially a mascot named "Gekota", so much so she thinks she sees a real-life version of it in the form of Heaven Canceller, of all people.
  • Death Seeker: Was planning on doing this, both in hopes that were she to lose to Accelerator on the first move, the calculations made for the experiment will be invalidated, as well as to atone for the suffering she put the Sisters through. Touma points out the flaws to her plan (even to the point of refusing to defend himself when Mikoto tried to zap him out of her way), that she won't be saved, and her death will not give the Sisters happiness, meaning in the end, no one will be saved.
  • Despair Event Horizon: During the Sisters arc, she constantly sacrifices sleep and fights constantly to the point of nearly passing out to stop the project. After seemingly wiping out every facility, more pop up and function in a way that actually benefits them if more shut down and then her last hope of using the Tree Diagram fails when she learns that it was destroyed. Upon learning this, she realizes she just can't stop the experiment and intends to go and commit suicide in a manner that will hopefully invalidate the premises the experiment was built on and end it.
  • Double Standard: Abuse, Female on Male: Frequently throws lightning at Touma whenever he does something to piss her off, and has tried hitting him with attacks that would very well have killed him if he didn't nullify them in time. Justified from her perspective because she thinks that he's just holding back and would just nullify them anyways. In the few times where he doesn't nullify them, she's shocked and realizes just how serious the situation has become.
    Touma: If I had taken a direct hit just now, I would have died!
    Mikoto: It wouldn't work on you anyway!
  • The Dreaded: Once delinquents realize that they are trifling with The Railgun of Tokiwadai, the smart ones will invariably drop their weapons and run in terror.
  • Electric Torture: Played for Laughs as a Running Gag — this is how she usually rebuffs Kuroko's attempts to make out with her.
  • Elegant Classical Musician: Skillfully playing the violin while wearing a lovely dress? Yup.
  • Embarrassing Nickname: Touma used to call her "Biri-Biri" ("Bug-Zapper"), a name she doesn't like.
  • Enmity with an Object: A certain vending machine which once swallowed her 10,000 Yen (about $100) note. She often gets revenge on it by kicking or using her powers on it to induce it into giving free drinks.
  • Erotic Dream: Has one of Touma in the beginning of Season 2 Episode 17.
  • Even the Girls Want Her: Much to her chagrin. During the school festival episode multiple students try to give her gifts.
  • Failure Is the Only Option: All her attempts to stop Level 6 Shift are squashed by Academy City's administration before Touma lent a hand.
  • Feed It with Fire: Not only is she immune to all but possibly the most powerful electrical attacks thanks to her ability, she can piggyback off existing sources of electricity or static charge to perform even stronger and/or otherwise-impractical attacks.
  • Flight: When she's over a body of water, she performs hydrolysis on the water particles so she can propel herself and fly.
  • Full-Contact Magic: When firing off objects larger than her typical coins with her Railgun, Misaka punches them forwards.
  • Goofy Print Underwear: Kuroko finds out, much to her delight, that Mikoto's panties share the same "thumbs-up bunny" logo that the T-shirt she was given as a present has... then she just had to sing that aloud. This is perhaps the reason Mikoto wears Modesty Shorts.
  • Hair Flip: On occasions. With an electric arc between her head and her hand.
  • Hair-Trigger Temper: Is rather quick to anger over the smallest of slights, and has a vengeful streak three-miles-wide towards those who personally wrong her (namely Touma earlier in the franchise, chronologically); that said, she WILL forgive (and even befriend) you after she has exacted vengeance by pounding you into the ground.
  • Hard Work Hardly Works: Subverted, as her quick ascent up Academy City's rankings is often held up as an example of how anyone can succeed with hard work, However, with the revelation that the scientists behind the Sisters experiment obtained her DNA map when she was at a lower level, and the much later revelation of the existence of the parameter list, this becomes a Double Subversion, since these mean that Mikoto had actually been pegged for greatness very early on in her development and was helped along the way much more than the average student.
  • He Is Not My Boyfriend: She gets put into this situation by Index, her friends, in front of Touma and their parents too (cue massive blushing). She keeps denying it, but no one believes her.
  • The Hero: Her own series obviously focuses on the heroic deeds she performs when Touma isn't around.
  • Heroic BSoD: She falls into one when she sees Accelerator killing one of the Sisters, and being unable to do anything to stop it.
  • Hero with Bad Publicity:
    • A plot point during the Shopping Mall Demonstration SS. Using a method of spreading rumors of a possible nuclear attack by her, every rioter in the area targeted her with rifles, axes, and every other weapon they could. This also counts as Mugging the Monster because if she wasn't The Fettered, she could have simply electrocuted them all and been done with it.
    • She is also known in the 7th District as 'that crazy bitch from Tokiwadai' for screwing with people's phones with her power.
  • Hey, You!: She has yet to call Touma by his name, even after she actually learned it. Save the PSP game intro.
  • High-Pressure Emotion: In more comedic scenes, she is prone to sudden puffs of steam to accompany her Luminescent Blushing to emphasize how vulnerable and embarrassed she is about feeling romantic-love towards Touma.
  • Hollywood Hacking: Her ability to control electricity and electromagnetism allows her to hack low-level security with ease and even break into high-level computers like Tree Diagram with enough time.
  • Honor Before Reason: She has a big problem with asking others for help.
  • Hot-Blooded: More so than the comparatively laid-back Touma.
  • Hypocritical Humor
    • She makes fun of Touma for losing a 2000 yen bill to that evil vending machine, but in her first year she lost a 10000 yen bill to it, which is why she feels so justified in kicking and shocking it. 2000 yen bills are quite rare, however, so having to spend it in the first place was bad enough luck on its own.
    • She gets mad at Touma for always calling her Biribiri instead of her name, but she never uses his name either. He's always 'you' or 'that guy' or 'idiot'.
  • I Am Not Left-Handed: First, she can release a lot more electricity than she normally does, it's just that she typically holds back to avoid killing people. Second, she can use metal objects other than coins for her railgun attack, and the larger the object, the farther it can travel (since her range is due to the object vaporizing from air friction). Best shown during her fight with the Doppelganger in the Dream Ranker Arc, where instead of being slack-jawed in shock and horror at the sight of the machine creating a skyscraper-sized Golem out of city debris, Misaka simply smirks and matches it by creating a similarly-sized Golem out of iron sand to fight it in a Behemoth Battle.
  • Identity Amnesia: She forgets who she is in her angel form.
  • Idiot Hair: Had this as a child, a trait that Last Order shares with her. It's still drawn distinctly on her in the present, but it's finally fallen down.
  • Immune to Mind Control: Thanks to her high bioelectricity content, she is immune to mind control and mind reading. But given the fact that her brain operates on the same wavelength as her clones, the Misaka Network, their minds can be hacked to get to Mikoto herself, which is the mechanism for Gensei's attempt to get her to ascend to Level 6.
  • Infinity +1 Sword: Obtains the Anti-Art Attachment in New Testament Volume 13 and immediately leaps up the power ranking tiers...but is noted to be at a potential cost to her own health. Later on, she pairs with Shokuhou Misaki in order to mitigate the risk.
  • Jerk with a Heart of Gold: Short-tempered, vengeful and petty over the most childish-reasons, Mikoto is nevertheless kind-hearted and considerate to a fault, and unfailingly loyal to those who earn her respect/friendship.
  • Kindhearted Cat Lover: Mikoto has a huge soft-spot towards adorable baby animals, kittens in particular. To her disappointment, the ambient electricity generated by her sheer power causes discomfort in the poor little things, driving them away whenever she tries to play with them. This is a trait that the Sisters inherit from her.
  • Last-Name Basis: Virtually everyone refers to her as Misaka. This is inverted in the fandom, where (due to the vast number of characters who can be called "Misaka") she's almost exclusively referred to as Mikoto.
  • Lightning Can Do Anything: Shooting lightning, magnetizing to walls, creating swords from iron sand, firing railguns, hacking electronics, creating a biological radar, stopping mind control, reading minds to a limited truly says something about her versatility that the two Level 5s ranked higher than her possess the powers of literal creation and vector control (as in, one of the basic laws of physics) respectively.
  • Limp and Livid: Accompanied by furious shaking whenever she is about to go ballistic on Kuroko for her latest act of immature stupidity.
  • Little Miss Badass: Don't let her cute appearance fool you; this young lady is regarded as the third-most-dangerous person in Academy City for a very good reason.
  • Locked Out of the Loop: Is constantly left out of Touma's adventures. Even late into the New Testament series, where she actually does start to get involved more into the Magic Side, she doesn't know about Imagine Breaker and thinks Touma can just negate things in general.
  • Love at First Punch: Mikoto became interested in Touma after he first blocked her electricity while she was zapping some delinquents.
  • Magnetism Manipulation: Misaka Mikoto can do this as a side effect of her control over electricity. By modifying the flow of electricity in the air or on objects she can replicate the effect of an electromagnet, allowing for her to create a chainsaw out of iron filings or cling to metal surfaces. Even her signature Railgun is based on generating a powerful electromagnetic field. When she goes all out, she can manipulate enough iron sand and dust particles to create massive Combat Tentacles or form a skyscraper-sized iron sand puppet.
  • The McCoy: Between Touma's Kirk and Accelerator's Spock
  • Megaton Punch: The most common method to stop a clingy Kuroko.
  • Mistaken for Gay: When Kuroko met Mikoto's parents, acting her usual perverted self towards Misuzu (who thinks it's towards Mikoto), with the latter lampshading that her daughter may be lesbian.
    Misuzu: Mikoto, I didn't know you swung that way.
    Mikoto: No I don't!
    • Happens again in New Testament 22R when she and Misaki end up in a comprimising position by accident just as Kuroko walks in. Kuroko doesn't take it well.
  • Modesty Shorts: The trope picture. Much to Kuroko's dismay.
  • Ms. Fanservice: Side by side with Kuroko, she is most often portrayed in shower scenes and situations that show/emphasize her trim-and-firm, athletic figure.
  • Mundane Utility
    • She can use her electrical powers to cook.
    • Uses what she learned from the Power Curriculum, the same training that allows her to make micro-second calculations in order to utilize her ability, to count cards in poker.
    • In one Railgun omake chapter, it's shown that when Mikoto and Kuroko are feeling lazy, they just stay in bed, with Mikoto activating appliances from a distance and Kuroko teleporting things.
  • Names to Run Away from Really Fast: She's called the Railgun and is a Level 5. What did you expect?
  • New Transfer Student: In New Testament 5, she's planning on taking the entrance exam for Touma's school.
  • No Guy Wants to Be Chased: Well, Mikoto is a girl, but the chaser is female. In any case, Kuroko's clingy, perverted and creepy behavior clearly gets on Mikoto's nerves while she's friendly and generous to everyone else not named Touma. And unlike Touma, poor Kuroko isn't getting the tsundere treatment but rather the Vitriolic Best Buds treatment.
  • No Kill Like Overkill: She has powerful electromagnetic abilities that allow her to hotwire and remotely control cars. But when a robber tries to run her over, she simply fires her railgun at the car to send it careening over her head.
  • No-Sell
    • An electric field around her prevents the Queen of Tokiwadai from tampering with her mind. Presumably, this also means that she's immune to other brainwashing and telepathic abilities. In chapter 61 (Railgun T, Episode 10), Gensei Kihara finds a loophole. She's immune to a level 5's mind control, but the MISAKA network is not. So he uses Exterior to take control of them, fuses them to Mikoto, and then controls her indirectly through them.
    • When she attacks the second to last lab in the Sisters arc, she runs into a prepared battlefield absolutely filled with various traps set by Frenda. However, no matter what Frenda throws at her she just defuses it or uses magnetism to avoid the attacks, leaving Frenda increasingly uncomfortable with the power her opponent must have.
    • Tasers and other electrical weapons are also useless against her, since her power output matches or surpasses entire power plants.
  • Oblivious to Love: She's actually oblivious to her own love. It takes her until Volume 16 to realize that she likes Touma.
  • Occult Blue Eyes: Combined with Glowing Eyes of Doom. Her initial state during her forced Level Shift 6 has lightning-blue eyes (literally, because lightning is generating out of them) and she's effectively taking the first step to becoming an actual angel.
  • Offhand Backhand: In her fight with Touma during the School Festival (when she's in her angel form), she doesn't even look at him. She just casually sends ludicrously large bolts of electricity at him while trying to think of a way to destroy the Windowless Building. It doesn't work, because it's Touma, but she still treats him as a persistent fly rather than a serious threat.
  • Oh, Crap!:
    • Gets a pretty intense one when she grabs Touma by his right hand, thinking that doing so would prevent him from blocking her attacks anymore, only to realize she can't use her ability at all now and it looks like she just gave him a free shot for a hook to the face.
    • When fighting Accelerator for the first time and realizing he didn't even move to reflect her Railgun attack, her previous rage just flat-out deflates into a look of broken shock.
    • In Chapter 108, her face twists into shock when she realizes the dragon the criminal esper Kimi just manifested looks like one of the eight in Touma's arm that stopped her Level 6 Shift. She immediately manifests a giant iron sand doll to attack it, but with one attack it completely neutralizes her efforts and tries to smash her.
  • Ojou: Everybody in Tokiwadai treats her as one. While she has the wealth and the status, she prefers to act like a tomboy with childish tastes and is annoyed that everyone expects her to be a Proper Lady.
  • One-Woman Army: She can take on entire Black-Ops battalions armed with automatic weapons with ease. Quite a few low-level mooks will surrender instantly when they realize who they're fighting. Heck, the description of a Level 5's power level literally amounts to being able to take on an entire military force on even ground.
  • One-Winged Angel:
    • Beginning the Level 6 Shift comes with an appearance shift into a demonic form. She undergoes two separate transformations afterwards that make her look and become less human looking as time goes on.
    • To a certain extent: her usage of the Anti-Art Attachment has increased her powers to insane levels, to being potentially able to fight against Magic Gods, but because of its magical nature, it slowly weakens her, and will eventually kill her, if she is not careful.
  • Onee-sama: Kuroko and a legion of admirers address her with great respect and adoration. The former is certainly interested in her romantically.
  • Only Sane Man: She's the only one of the Level 5s that is considered publicly presentable and has become something of a mascot as a result despite her own quirks that keep her from being showcased too much. Accelerator and Kakine are antisocial murderers, Mugino appears normal but only until she gets angry (not to mention the fact that she's totally willing to murder others for her job), Misaki is paranoiac who can't trust anyone she can't mind control and abuses her powers, Gunha is a Cloudcuckoolander who's convinced he's a superhero, and the sixth Level 5 apparently never appears in public. Mikoto, by contrast, is just a tsundere tomboy with childish tastes. This is also only because the higher ups used mass media/rumors to create her ideal image and covered up Mikoto's various incidents.
  • OOC Is Serious Business: Kuroko gets extremely worried whenever Mikoto doesn't zap or reject her.
  • Our Angels Are Different: In chapter 61 of the Railgun manga and episode 10 of Railgun T, she begins to Awaken to her angel form when fused with the MISAKA network. In the next chapter and episode, while she is only two percent of the way to level 6, she calls down the strongest lightning strike ever recorded, and is specifically mentioned to be dozens of times more powerful than normal. She also learned how to teleport by Ride the Lightning.
  • Out of Focus: In the Index series, where, despite often being billed as a main character, she hasn't been very plot relevant since the Sisters Arc, albeit still making some of the biggest recurring appearances as a supporting character.
    • Subverted to an extent, come the New Testament series.
  • Paper-Thin Disguise: Her idea of "disguising" herself consists of wearing short shorts, a T-shirt, a baseball cap and a ponytail. Anyone who knows her can easily recognize her in it, even though she gets mistaken for a boy by security, much to her chargin.
  • Power Armor: She eventually builds her own version of the Anti-Arts Attachment.
  • Rage-Breaking Point: Played for Laughs when Misaki mocks her about the Bust Upper Indian Poker card business and Mikoto, already ticked off by earlier mocking, angrily grabs Misaki's boobs in public and fondles them while shouting about how big breasts don't mean anything, only to immediately have a Heroic BSoD upon realizing how stacked Misaki really is (and how big boobs actually feel) and tuning the now-flustered Level 5 out.
  • Recognition Failure: Despite being the face of Academy City, the average citizen does not recognize her on sight, and many street thugs assume she is just a helpless girl and try to mug or sexually harass her.
  • Required Secondary Powers: She's explicitly noted to be immune to electrical attacks when a girl tries using a taser on her. If she doesn't fry herself, what good is a taser going to do?
  • The Rival: In the Index series her rival is Index for Touma's affections. In the Railgun series her rival is Shokuhou Misaki, the Queen of Tokiwadai, the other level five at Tokiwadai, though it mellows into a Friendly Rivalry eventually.
  • Running Gag: Her love of things considered childish, including Gekota (a Hello Kitty like character), Goofy Print Underwear, childish pajamas and a frilly swimsuit, all of which she denies when asked about.
  • Secret-Keeper: She accidentally finds out about Touma's memory loss in Volume 14, and promises him to keep it a secret.
  • Self-Made Man: Mikoto climbed all the way from Level 1 to Level 5 through hard work, but this is also subverted when it was revealed that Academy City's higher-ups can predict an esper's development.
  • She's Got Legs: The camera loves to focus on this fact as much as Kuroko.
  • Shrinking Violet: Occasionally when around Touma.
  • Shock and Awe: The nature of her abilities. She's called "Railgun" for a reason.
    • Convection Schmonvection: Averted against the AIM Burst - upon it deploying a barrier that nullifies electric shock, Misaka uses the massive amounts of heat generated by her lightning to melt the thing.
    • Cursed with Awesome: Has a constant electrical field around her and cats won't go near her because of it.
    • Extra-ore-dinary: Can use her lightning abilities to control magnetism and therefore control metal. Not only can she use iron sand to make a Whip Chainsaw, she can even create a giant iron sand Golem that towers over skyscrapers.
    • Finishing Move: Her railgun was called as such a few times.
    • Hollywood Hacking: She can use her powers to directly interface with electronics and hack them, though she admits her way is more of a brute-force approach compared to Playful Hacker Uiharu.
    • Kill Sat: She can more or less drop cloud-to-ground lightning on targets. Her maximum output when using her electricity this way is 1 billion volts. For reference, the strongest lightning bolt ever recorded in real life only had a voltage of 25.5 million, meaning that it's about 2.6% of what Mikoto is capable of. And then there's the bolt she drops in Railgun T, Episode 11 on the Windowless Building, which is effectively so huge it resembles a Pillar of Light.
    • Money to Throw Away: Downplayed. Mikoto's usual ammunition for her Railgun are arcade tokens which she can launch at three times the speed of sound using her electricity.
    • Pillar of Light: In her angel form, despite only being 2% of the way to Level 6, she's able to call down a lightning strike so big it visually resembles one of these able to completely encompass the Windowless Building.
    • Power Incontinence: Whenever she gets angry she usually short-circuits an entire block.
    • Ride the Lightning: She create lightning tendrils that she can "ride" on for quick movement, to the point it looks like she performed a Flash Step or Teleportation via electricity. She can teleport herself through her electric attacks when she's in her angel form, though exactly how this works is not examined in depth.
    • Selective Magnetism: An integral part of her railgun.
    • Wall Crawl: By magnetizing herself, she can stick to walls and ceilings. Mugino nicknames her "Spider-Woman" for it.
    • Wave-Motion Gun: Her railgun deals tremendous damage in a straight line, and it gets bigger and more destructive the larger the object she fires is.
  • Shooting Superman: In an early filler episode of the anime, the opponent of the week attempts to use a taser on her.
  • Shown Their Work: Unlike most of the Technobabble in the series, Mikoto's railgun is actually surprisingly plausible. The effects shown fall into Artistic License a bit, but an MIT physics graduate found that the numbers we're given add up realistically. Even the lack of recoil is realistic; since Mikoto forms the rails for the gun out of nothing but electrically charged air, the recoil just produces a Dramatic Wind.
  • Shut Up, Hannibal!: Delivered to Therestina via Railgun.
  • Signature Hair Decs: Her head progressively collects cute hair clips over the course of the series. In the series, she has other hairstyles and accessories like ponytails and headbands
  • Squishy Wizard:
    • She's one of the most powerful characters in the Toaruverse, but when Touma had his hand in hers to shut down her electric powers and had his other hand raised, she closed her eyes in fear and nearly started crying; as he himself lampshades, it's hard to hit someone with a face like that. That being said she does not take kindly to him attempting to throw the fight out of pity for this vulnerability on her part. Or saying out loud the reason why he took pity on her.
    • Subverted later on, as by the Jailbreaker Arc Mikoto shows during her fight with Kimi that she's evidently taken a few levels in physical ability by combining self-defense moves with dirty street-fighting, including stomping her foe's foot to pin them down and kneeing them in the stomach for a follow-up, which legitimately surprises Kimi who figured the most hand-to-hand combat Mikoto knew was some low-level self-defense moves that she herself, who had been brawling for much of her youth, would easily be able to deal with.
  • Stalker Without a Crush: Before she starts to like him (probably), she always chases Touma around whenever she sees him because she wants to fight him. Or rather, she wants to beat him since he always nullifies her power and then gives her the slip. The one time he looks like he might fight back, she cowers away from his raised fist and he just gives up. Pissed at being looked down on as a Level 5 who has never had to really try to beat anyone in a fight, she starts chasing him around even more than usual.
  • Strong Family Resemblance: To her mother.
  • Shorttank: And one who is quite embarrassed to show any sort of girlish behavior at that.
  • Super Mode: In chapter 61 of the Railgun manga and episode 10 of the Railgun T anime, Misaki's Exterior is used to force Mikoto to join with the MISAKA network in another attempt at a Level 6 Shift.
  • Swiss-Army Superpower: Mikoto is an Electromaster, a type of Esper that can manipulate electricity. While it sounds straightforward, it has shown to be one of the most versatile esper powers in the series.
    • She can of course zap people directly, either by shooting electricity herself or by causing lightning bolts to drop from the sky.
    • She can manipulate the weather, causing thunderclouds big enough to engulf an entire city to appear regardless of the actual forecast.
    • Control of electricity by extension means the ability to create and manipulate magnetic fields, which is almost a Swiss Army Superpower unto itself, with applications such as the manipulation of metal objects, the ability to cling to and walk on surfaces which incorporate metals, cause EMPs, generate and counter microwaves, etc.
    • One of two of her most used power applications other than her lightning is her signature move and namesake, the Railgun. Creating what is essentially a virtual railgun in the air, she can impart enough force on whatever she chooses to fire that even small objects, such as the arcade tokens that constitute her normal ammunition, are capable of damage more resembling a rocket launcher.
    • Her other major use of her magnetic manipulation is the creation of constructs formed from iron sand pulled from the ground. She has made chainsaw iron sword-whips, spears, mini-tornadoes, shields, drills, needles and even a giant iron sand puppet.
    • Her ability causes her body to be naturally immune to electric attacks.
    • Mental effects of all kinds are useless against her, as her AIM field passively corrects deviations caused by mental manipulation.
    • Being able to control electricity also makes her a supremely capable and quick hacker, even of Academy City's military grade equipment, which has far better security than the rest of the world.
    • She never does it herself until forced to during an experiment to see if she could become a level 6, but states that through the use of bioelectricity you can form a network of a large number of minds, which is the center of at least two incidents she's involved in.
    • She can redirect attacks that are electron-based, even if they are not explicitly electrical, such as Meltdowner.
    • She can jam enemy signals and disrupt targetting computers, though her method is something of a brute force solution that jams all local frequencies.
    • If her muscles are paralyzed, she can manually control them by mimicking the normal functions of the nervous system. The tradeoff is that her powers by necessity must always be "on" and she's effectively a walking stun gun that a person can't touch without getting shocked.
    • She can use the flash of lightning to temporarily blind people, and even combine it with the roar of thunder to replicate the effects of a stun grenade.
    • She can replicate Junko Hokaze's ability, which is based on manipulating the electrical signals in the body's cells to draw out further strength and surpass human physical limits. However, she doesn't like this application because it reminds her too much of Accelerator's power. Junko also states that Mikoto is likely to be able to manipulate lasers, as light is a type of electromagnetic radiation.
    • She can ionize small objects like metal cans and turn them into plasma. It's also suggested she might be able to do the reverse and return plasma to its original state.
    • Finally, she passively generates electromagnetic waves at all times, which function as a sort of personal radar. It's impossible to launch an attack from her blind spot because she doesn't have a blind spot.
  • Tears of Joy: In the Railgun version of the Sisters arc, Mikoto cries when Touma is willing to help her to save her clones. She cries again when she sees Touma getting up after receiving major injuries from Accelerator.
  • Tomboy and Girly Girl: The tomboy to Kuroko's girly girl given her rough manners and aggression.
  • Tomboy with a Girly Streak: She wears shorts under her skirt, and when allowed seems to prefer to do away with the skirt altogether. She's a bit violent and seems to enjoy a friendly fight. She's also a complete sucker for cute childish Gekota items, and she likes large stuffed animals.
  • Took a Level in Badass: While her forced Level 6 Shift was stopped, it's implied she still kept a general power increase as a side-effect, as the above-mentioned building-sized iron sand Golem and the massive city-spanning thundercloud was only ever seen being used after said events.
  • Trauma Button: Briefly shown in her confrontation with Raifu. At first Mikoto hesitates to attack her after seeing her power in action, as it reminded her of Accelerator's vector control, and has to forcibly stop her shaking hand and remind herself there's no other esper with his ability.
  • Trigger Happy: In the first episode of Railgun S she zaps a bunch of guys that had been chasing Saten (all at once) who were confronting Kuroko and Uiharu. She reminds Kuroko and Uiharu the shop they want to go to will close soon and then she says "By the way, who were those guys?"
    Kuroko Couldn't you have asked that before you shocked them, Onee-sama?
  • Tsundere: Type A towards Touma. Kiyama, of all people, actually lampshaded it.
  • Unknown Rival: Touma met her one day trying to protect her from some thugs, but just pissed her off more than they did, causing her to attack all of them. He blocked her attack effortlessly, after which she kept challenging him to duels. After he loses his memory and keeps it a secret from everyone, they meet again and now she's really an unknown rival because he has no idea who this middle school girl is or why she's both hostile and resigned towards him.
  • Unstoppable Rage: While destroying the facilities involved in Level 6 Shift Project (especially in the case of one she attacked after she found out Tree Diagram had been shot down, ruining her plan of hacking it to save her sisters).
  • Weirdness Censor: She already met several sorcerers and saw spells performed on a few occasions, but each time she either attributes it to esper powers or some other scientific explanation due to Academy City's abundance of espers. The one time someone tried explaining that's not how it works, they gave up before they even got to the point because Misaka asked a question while still trying to frame it from a scientific viewpoint.
  • When She Smiles: In Railgun S when the storyline starts to merge with Index's Sisters arc, after six episodes of running herself extremely ragged, not sleeping or eating, all to try to stop the Level 6 Shift project.
  • Wide-Eyed Idealist: At first, she had an idealistic view about Academy City. However, after the events of the Sister's Arc and experiencing first hand Academy City's dark side, she became more cynical, but avoided showing it in front of her friends.
  • With Great Power Comes Great Insanity: Implied. Gensei Kihara states that once she's 53% of the way to Level 6, she will lose her human personality.
  • Wolverine Publicity: Mikoto appears in many promotions for the Index anime and her appearance in the openings suggest she is part of a trio with Touma and Index and will be involve in the plot. However, she only appears once a while, rarely hangs out with Touma and is only a supporting character at best following the Sisters Arc.
  • Wrestler in All of Us: One of her methods to stop a clingy Kuroko.
  • You Are Not Alone: When she properly reunites with Touma in New Testament Volume 2, she says this to him. The author even states that she's now "entering the fight", meaning she's going to involve herself with Touma's adventures with the Magic Side.

    Kuroko Shirai 

Kuroko Shirai
Voiced by: Satomi Arai (Japanese) and Alison Viktorin (English)

Mikoto's underclassman and roommate in Tokiwadai Middle School, a Level 4 Esper, and member of Judgment. She has an obsessive crush on Mikoto, who she calls "Onee-sama" ("Sissy" in the dub), and is on the constant lookout for a chance to... get close to her (which Mikoto rarely allows, let alone appreciates).

  • Abhorrent Admirer: Mikoto views her as a friend and just a friend, so she gets pissed when Kuroko tries to be, well, Kuroko. If she's lucky, she gets electrocuted. If she's unlucky, she gets ignored in favor of Touma.
  • Amusing Injuries: It seems Ryo Saeba's problem also applies to female perverts.
  • Arbitrary Skepticism: Does not believe things that contradict Academy City's Power Curriculum, like Gemstone espers, Imagine Breaker, or Level Upper. She eventually learns Level Upper is real.
  • Authority Equals Asskicking: One of the most active members of Judgment and one of the most effective.
  • Awesomeness by Analysis: To teleport, she has to make calculations on factors like mass, volume, vector, etc. Also her fight against the thug that could create illusions.
  • Back-to-Back Badasses: With Mikoto and Mitsuko.
  • Badass Adorable: Besides her power, she also knows martial arts like aikido and can easily take down grownup thugs. This extends to when she was in elementary school.
  • Barely-There Swimwear: Her outfit in Railgun Episode 13 shocked everyone by how ridiculously small it was.
  • Batman Can Breathe in Space: In the Railgun S season finale, she and Mikoto were launched to the edge of the atmosphere without suits. While seemingly unaffected by the vacuum, they were visibly choking before they made it back to Earth.
  • Beauty Is Never Tarnished: Averted in that Kuroko's job involves going up against thugs with no qualms about hitting her full on, and whenever they do manage to land a punch the damage stays. During the climax of the Level Upper arc she's too injured to participate in the fight and is shown to be in pain when she moves. She also winds up in a wheelchair for a while after a particularly brutal fight with Awaki.
  • Borrowed Catchphrase: During the last episode of Railgun S, every single member of Judgment uses her Catchphrase.
    Konori: We're gonna do this Shirai's way.
    Kuroko: Hey!
  • Bunny-Ears Lawyer: Yes, she is completely obsessed with Mikoto. But she's also an experienced fighter who is skilled in the detective/law enforcement required for her job.
  • Catchphrase
    "I'm/We're from Judgment(DESU NO)!"
  • Cat Smile: She often has this expression, usually just before planning something perverted. This usually involves her Onee-sama Mikoto.
  • The Cavalry Arrives Late: Whenever she scolds Mikoto for interfering with Judgment business, Mikoto will retort that if she and her Judgment colleagues would show up to a crime scene on time for a change, she wouldn't have to. How ironic that she's almost always late even though she can teleport.
  • Character Exaggeration: In the Railgun manga, Kuroko annoys Mikoto sometimes, acts somewhat perverted and quite clingy, but is often shown to be hard working, professional and rather concerned for her. In the anime, she tries to rape her on occasion and almost every conversation includes attempts at groping her or other forms of sexual harassment.
  • Chewing the Scenery: And Satomi Arai is having a whale of a time playing this lovable psycho!
  • Clingy Jealous Girl: Absolutely hates it when Mikoto is spending time with Touma. She doesn't take it too well either when she learns that Mikoto does in fact like him. She also freaks out when she mistakenly thinks that Mikoto and Mikasa are getting intimate with each other.
  • Cry Cute: Played for Laughs as a Running Gag every time Mikoto gives her either the cold shoulder or the jolt.
  • Cute, but Cacophonic: Her voice runs the whole gamut between cutesy and shrieking.
  • A Day in the Limelight: The Remnant arc in the Index series (Volume 8 in the novels / Season 2 Episodes 6-7 in the anime).
  • Deliberate Injury Gambit: In her fight with Mitori, she intentionally lets herself get stabbed in the hand by the latter's thrown knife rather than teleport like expected, as Mitori gambled on using the restrictions of the sewer space to kill Kuroko with her hidden second knife the instant she reappeared with no way to dodge. Instead, her shock at Kuroko going against expectations leaves her too slow on the draw and lets Kuroko pummel her up close.
  • Demoted to Extra: In the Index series. While she was never that prominent in the first place, Kuroko's role has been reduced to occasional cameos, and once went an entire 15 volumes between appearances.
  • The Determinator: Overlooked a lot, but her actions in the Tree Diagram Remnant arc more or less confirm her as one.
  • Deuteragonist: Kuroko is the second most important character after Mikoto.
  • Does Not Like Men: At first, she refrains from stepping between Touma and Mikoto because she thinks contact with Touma will turn Mikoto off men forever after she realizes how "worthless" they are. When she realizes that's not happening, that's when she starts taking steps herself.
  • Double Knockout: In her fight with Tsurigane, she manages to get her hands on the ninja's paralyzing knife and slice her with it to take her down, but because she was sliced by it earlier she could only stay conscious for a little bit longer thanks to the measures she took to slow its spread through her body.
  • Early Installment Weirdness: When she is first introduced in Index, Kuroko seems to ship Misaka and Touma while still obsessing over the former. Eventually, she stops shipping them and becomes jealous whenever she sees Touma with Misaka. This is best displayed in both versions of the Sister Arc; in Index, she is calm and playful but in Railgun, she is burning with jealousy but hides her anger with a smile on her face.
  • Electric Torture: How Mikoto usually rewards her attempts to make out with her, and always Played for Laughs.
  • Erotic Dream: Often has sexual fantasies about her crush, Mikoto.
  • Everyone Has Standards: She might be obsessive towards Mikoto, but when she's feeling down Kuroko just wants to help her cheer up and knocks off the creepy behavior.
  • Expressive Hair: Her pigtails.
  • Fille Fatale: A bit too sexually aggressive for a thirteen-year-old girl for comfort...
  • Fiery Redhead: Though less violent tempered than most girls of this trope, Kuroko still has the melodramatic and passionate personality that's typical of it.
  • Forgot About Her Powers: Despite her often ingenious uses of her power, she sure gets punched in the face a lot for someone who can teleport instantly. Teleportation does require some very complex mental calculations, though, so it may be difficult to use reflexively.
  • Friend to All Children: Kuroko shows a surprisingly kind and soft-hearted side towards small children; she is a strict yet attentive and loving big-sister to any child under her charge.
  • Girlish Pigtails: Always has her hair in curly pigtails.
  • Hard Head: She would already be a vegetable were it not for this trope, considering how she normally deals with stress and/or frustration.
  • Handicapped Badass: She was confined to a wheelchair for a while. Then she teleports with the wheelchair and uses it as a weapon.
  • Hate at First Sight: She immediately views Touma as her rival for Mikoto's affections.
  • Hidden Depths: Just as Kuroko is lustful, possessive, immature and selfish, she is measure for measure soft-hearted, kind, considerate and selfless. Never judge a book by its present cover.
  • Hypocritical Humor:
    • After Kiyama started undressing in a cafe, Kuroko tries to stop her. When Kiyama explains that there are no men in the cafe, Kuroko retorts that there may be women with "twisted tastes" watching. Guess who she's talking about...
    • She claims she wants to protect Mikoto from Touma because she believes Touma is a perverted stalker. Guess what she normally does to Mikoto. Frankly it’s borderline appalling that she doesn’t see the irony.
  • If It's You, It's Okay: Oddly enough, Kuroko doesn't view herself as a lesbian. When working together with Mikoto to take down an attacker holding hostages, she denies being into girls with complete seriousness.
    • Though she'd had her memories of Mikoto erased at the time, so its also possible Mikoto was her Closet Key.
  • Improbable Weapon User: Needles that she teleports into her opponent's clothes to pin them down or into them to cripple them. Also her wheelchair. When the situation is really serious, she'll use metal rods instead of needles.
  • Incompatible Orientation: She doesn't seem to get that Mikoto is straight.
  • Jerk with a Heart of Gold: She does not seem to understand that "no-means-no" when it comes to her molesting behavior towards the decidedly-straight Mikoto, but when Mikoto is down she's worried enough that she'll even support Mikoto hanging out with Touma despite her usual jealousy. Nothing else seems to cheer her up, so if she has to hand her Onee-sama over to "that troglodyte" so be it.
  • Kawaiiko: She plays this image up for her benefit, but she can be aggressive and very sexually forward at the drop of a hat.
  • Leeroy Jenkins: As a Judgment trainee, she had a habit of charging at the bad guy without thinking. Konori scolded her for it and it nearly got everybody killed when she faced the bank robber who had the ability "Equal Speed". She occasionally reverts to this behavior.
  • Leitmotif: Onee-sama....
  • Locked Out of the Loop: Has no idea about the Sisters, the Magic Side, or Mikoto and Touma's adventures.
  • Logical Weakness: She might be able to teleport nigh-instantaneously, but she still has to rely on making the necessary mental calculations to perform it. As a result, she can't just teleport away on reflex easily if she's caught off-guard by a surprise attack that messes said calculations up.
  • Lovable Sex Maniac: There's something very funny about her attempts to get frisky with Mikoto. In fact, upon seeing Mikoto's mother (who looks just like an older, bustier version of Mikoto), she already got fixated on the latter's assets, complete with glaring red eyes, and probably would have taken a grab real fast were she not bound to a wheelchair after a particularly brutal fight with Awaki.
  • Malicious Misnaming: She hates Touma, so she almost always refers to him as "The Ape" or "The Troglodyte".
  • Meaningful Name:
    • Her full name literally means "Black Girl White Well", highlighting the contrast between her cutesy facade and perverted personality. Mikoto even points this out in Railgun Episode 2 before beating her senseless.
    Mikoto: I'm gonna fry you as black as your name!
    • Besides the feminine suffix on "black", a kuroko can refer to a type of stagehand which dresses in all black to signify they're not part of the scene. This seems like an allusion to her power, that is the ability to move between places without traversing the intermediary distance in the same way kuroko stagehands can move across a stage affecting the scene.
  • Moment Killer: Amazingly, besides the usual examples, Kuroko is this to herself. Many is the occasion where she has a heartwarming moment with Mikoto... only to have her feelings get the better of her and abruptly launch herself at Mikoto, setting herself up for a beatdown. She also has a habit of ruining Mikoto's moments with Touma.
  • Ms. Fanservice: She's the primary one of the Railgun quartet. Mind you, due to her lack of development, this is just as often played for awkward laughs as it is occasionally played erotically straight.
  • Murder the Hypotenuse: Played for Laughs regarding Touma, even after he saved her from Awaki.
  • Never Be a Hero: She constantly scolds Mikoto for stepping in and helping, saying civilians should stay back and leave the heroics to Judgment and Anti-Skill.
  • No Sense of Personal Space: Will take any opportunity to try to kiss or grope Mikoto.
  • Not Quite Flight: Can use her teleportation to move above ground level which becomes useful in the first episode of Railgun S when the bad guys try to flee in a helicopter. She can even do it from the upper atmosphere, allowing Mikoto and herself a safe trip back in Railgun S's finale.
  • The Nudifier: She can teleport someone's clothes off them. See Power Perversion Potential.
  • Ojou: Her highly refined and ladylike speech-pattern fits this trope perfectly. On the other hand, she possesses some decidedly unladylike tropes.
  • One-Woman Army: Due to her very intelligent use of her already flexible power.
  • OOC Is Serious Business: Mikoto gets worried when Kuroko stops acting perverted towards her.
  • Out with a Bang: When asked by Tsurigane how she would most like to die, Kuroko states (while getting a nosebleed) it would be her on her deathbed from an illness with Mikoto finally accepting her love and crawling into the bed with her naked.
  • Panty Thief: Her collection of really kinky panties contains only one normal pair, stolen from her "onee-sama".
  • Petite Pride: Shows no angst whatsoever about being the least endowed amongst her friends, though that doesn't stop her from being stunned with admiration at the sight of Mii in a swimsuit.
  • Power Perversion Potential: She uses her teleportation to spy on Mikoto, steal her stuff, and even steal her clothes while she is wearing them.
  • Psychic Teleportation: Her Esper power, "Teleport". She can teleport herself and things she is touching. She has a weight limit of 130.7 kilograms and a distance limit of 81.5 meters. When she was younger, she could not teleport herself, but learned how to do it after training.
  • Psycho Lesbian: When on duty or doing anything not involving Mikoto, she's hard working and likes to help people. When Mikoto enters the picture, she sexually harasses her constantly.
  • Reasonable Authority Figure: Were it not for her perverted streak, Kuroko is the picture of a responsible, by-the-book cop in Judgment.
  • "The Reason You Suck" Speech: Delivers a beautiful one to Awaki, prompting a breakdown.
  • Shameless Fanservice Girl: If it's for her "onee-sama", she'd be more than happy to be really kinky around her.
  • She's Got Legs: Boy howdy! And the camera loves to remind us of that whenever she's in flight or arming the darts strapped to her thighs!
  • Single-Target Sexuality: She only expressed interest in both Mikoto and later her mother (who is almost the splitting image of her daughter, minus being more well-endowed). When her memory is wiped by the Queen she rejects the idea that she's a lesbian, which makes the situation she's in baffling for her since she can't help fixating over Mikoto. It may be less of a case of being a lesbian and more a case of being a Misakasexual ...
  • Stealth Hi/Bye: Does the bye part then the hi part in the first Index opening.
  • Teen Genius: Can do 11th dimensional vector calculations.
  • Tele-Frag: By teleporting one object over another, she can displace matter occupying the old space. She once tore down a building by teleporting sheets of glass into the support pillars using this feature of her esper power. She also threatens to teleport her needles into people's bodies as a way to make them stand down.
  • Thinks Like a Romance Novel: Is prone to endearingly romantic fantasy-segues, such as her and Mikoto taking the roles of Ingrid Bergman and Humphrey Bogart respectively in the "We'll always have Paris" misty-runway farewell of Casablanca.
  • Third-Person Person: On occasions.
  • Tomboy and Girly Girl: With Mikoto; she's the girly girl given her highly refined and ladylike speech-patterns and romantic fantasies.
  • Too Kinky to Torture: When it occurred she had just (accidentally) taken an aphrodisiac, which was probably responsible for her reaction. It's still not really too out of character for her though.
    Kuroko: Oh, the whip of Onee-sama's love!
  • Unknown Rival: Touma is oblivious to how much she wants to get him out of the way so she can have Mikoto all to herself.
  • Ungrateful Bitch: Despite Touma saving her, she never thanks him and still hates him for being close to Mikoto.
  • Verbal Tic: "Desu no".
  • Vocal Dissonance: There's a good reason Kuroko landed Satomi Arai her best supporting actress trophy, as it showcases her astoundingly flexible vocal range. Kuroko's voice is able to jump from sweet and girly, womanly and sultry to coarse and masculine at the drop of a hat.
  • Wrestler in All of Us: In Chapter 77 of Railgun manga, she uses Camel Clutch to punish Uiharu for calling her a pervert behind her back.
  • Yandere: Played for Laughs, in relation to both Mikoto, whom she admires, and Touma, whom she detests.

    Ruiko Saten 

Ruiko Saten
Voiced by: Kanae Ito (Japanese) and Brina Palencia (English)

Uiharu's friend and classmate, a Level 0 from Sakugawa Middle School, and another member of Mikoto's quartet.

  • Adaptational Curves: In the anime, her cup size tends to go up a couple grades when her shirt comes off.
  • Ascended Extra: While she has a major role in the Level Upper arc of the original manga, she's eventually shifted out of focus once that arc ends. In the anime, she's one of the lead characters, and is even inserted into scenes like Railgun Episode 1, where she was absent in the manga (she didn't even made her debut until the graviton bombings in Chapter 4). She comes back in the Daihaseisai arc in the manga, managing to wander into an area she really shouldn't and meeting Xochitl.
  • Audience Surrogate: The only unambiguously "normal" human in the entire franchise.
  • Batter Up!: Occasionally carries an aluminum baseball bat. Even to the Final Battle in S2.
  • Blow You Away: Normally she's a level 0, but when under the effects of Level Upper, she gains a level 1 version of Aero Hand.
  • Born Lucky: She has a lot of lucky moments, for example being able to track down the bank cards with ease. Then she gives Touma her good luck charm during the Daihaseisai and it gives him luck.
  • Breakout Character: Popular enough by fans to be turned into one of the Railgun anime's main cast members.
  • Canon Immigrant: Finally appeared in the main Index story in The Movie, and is introduced to the light novels in New Testament Volume 9.
  • Chekhov's Gunman:
    • It's because she's a Level 0 that she’s immune to the paralyzing "Capacity Down" sound wave, allowing her to save her friends from Telestina's clutches in Railgun Episode 24.
    • Spends most of Daihaseisai as this, including, perhaps most importantly, lending Touma her charm. If she had never done that, he would never have been close enough to help out when Gensei attempted a Level 6 Shift on Mikoto.
  • Despair Event Horizon: After she uses Level Upper and realizes she'll fall into a coma soon afterwards.
  • Early-Bird Cameo: Appears in both openings of the first season of Index, despite having never appeared in the novels.
  • The Everyman: As above, Saten is a mere mortal amongst gods and angels. Unlike most of the other characters in the series, she possesses no special abilities, and for that reason she is the easiest character in the To Aru-verse to relate to, hence her surprising popularity.
  • Fangirl: Of Teen Idol Hajime Hitotsui.
  • The Gadfly: She likes to have fun by flipping Uiharu's skirt, which she often fails to notice until Saten brings it up later. She also enjoys messing with people like Kuroko or Mikoto herself about the possibility of Mikoto liking Touma.
  • Genki Girl: Young, cheerful, and always seems full of spirit. Except for the time when she fell into depression after Frenda's disappearance.
  • Heroic Bystander:
    • In Railgun Episode 1, she saves a little boy from being kidnapped by a bank robber who has powers. Then, in the finale she smashes the Power Nullifier Telestina is using to incapacitate Mikoto, saving the day.
    • As of the premiere of Railgun S she may be heading for Chronic Hero Syndrome. As of the finale, she clearly is afflicted with it.
  • Irony: She wanted to know who Mikoto was baking cookies for. In chapter 58 of the Railgun manga (Railgun T, Episode 9), she finally meets Touma while her memories of Mikoto had been erased.
  • I Just Want to Be Special: The poor girl just wants an ability, even if it's only Level 1.
  • Laser-Guided Amnesia: Chapter 49 of the Manga (Railgun T, Episode 4).
  • Locked Out of the Loop: Has no idea about the Sisters, the Magic Side, or Mikoto and Touma's adventures.
  • Long Hair Is Feminine: She has long black hair, and in accordance with that, she has a girly personality.
  • Morality Chain: Suprisingly (or maybe not), Saten is this to Uiharu in Jailbreak arc. Saten prevents her best friend from making wrong decision with a pinch on her cheek and a soft scolding despite having her own injury to worry about.
  • My God, What Have I Done?: After she and her friends use Level Upper, one of her friends falls into a coma and she feels awful. Worse, she knows that she's going to follow soon as well.
  • Ms. Fanservice: The shower scene of the PSP game and the beach episode of Season 1 loves to remind us that anime Saten has the best proportions of the Railgun quartet.
  • Muggle Best Friend: Mostly to Uiharu, but also to Kuruko and Mikoto, since she has no esper abilities herself, something she initially hates.
  • Nice Girl: She is very friendly and outgoing. Her greatest joy in life is sharing happiness with her beloved friends.
  • No Sense of Personal Space: Loves to flip Uiharu's skirt just to see her panties, especially if they're in public.
  • Odd Friendship: She seemed to have developed this with Xochitl and later Frenda.
  • Plucky Girl: Brave, optimistic and kind, nothing keeps this girl's spirits down for long!
  • Sailor Fuku: Her school uniform.
  • Seiza Squirm: Does this during the festival episode during a tea ceremony.
  • Shipper on Deck: She decides during the Sisters arc that Mikoto is probably staying out at night because she's gotten a boyfriend. She's wrong, but is apparently never corrected. When she sees Mikoto being tsuntsun around Touma, she faked an injury so that she could get the two to dance together.
  • Shut Up, Hannibal!: Stops Telestina's gloating of humanity's supposed worthlessness by smashing the Capacity Down device paralyzing her esper friends with one mighty swing of her aluminum baseball bat.
  • Signature Headgear: A distinctive white-flower hairclip that is her signature accessory.
  • Stepford Smiler: In Academy City, life is hard for anyone who doesn't "measure up".
  • Too Dumb to Live: She was borderline during the the Railgun SS. She followed Mikoto into what was clearly an off-limits area thinking it was a casino, where she nearly gets killed by Olive, and then there was the issue with Xochitl blackmailing her. She didn't piece together that those attacks were real until later and decided to investigate on her own, gets caught, and was about to be "killed" when Xochitl saved her at the last minute.
  • Urban Legend: She's a particular fan of these, and whenever there's a rumor going around, she's usually the one who introduces them to the gang, and even seek to investigate them.
  • You Leave Him Alone!: Shouts this to Therestina while smashing the Capacity Down device.

    Kazari Uiharu 

Kazari Uiharu

Voiced by: Aki Toyosaki (Japanese) and Cherami Leigh (English)

Kazari is Ruiko's schoolmate at Sakugawa Middle School, and Kuroko's friend and colleague in Judgment as a Level 1 esper, famous for wearing a headband made of flowers on her head (and sometimes a surgical mask in the manga). Usually shy and humble, her personality can quickly change to overly excited, especially if it concerns the life of the upper-class (particularly anything involving Tokiwadai).

  • A-Cup Angst: When Kuroko comments that her body is "underdeveloped", she gets upset.
  • Adaptation Deviation: Prior to the release of Railgun, Uiharu is not acquainted with Misaka and their first meeting takes place in the twelth volume of the Index light novel. The anime adaption of this episode, which aired after the first season of Railgun, changes their dialogue to make them familiar with each other.
  • Ascended Extra:
    • In Index, Uiharu is simply a Judgment co-worker of Kuroko with little relevance to the plot. In Railgun, she is one of the main characters.
    • Much like Saten in Railgun, she's not really all that important outside the first story arc in the original manga. In the anime, her importance is significantly boosted.
  • Badass Bookworm:
    • She’s not a warrior in the least, but her computer expertise makes her just as formidable, if not more so than, a dozen warriors in the right situations. She is in fact so good she can defeat even electrokinetic espers when it comes to hacking, including Mikoto.
    • In the SP volume, she jumped onto a moving truck from an overhead bridge, then deployed a parachute she was wearing as a drag brake in order to slow it down! The deceleration was so extreme that the metal handrails she was holding on to were yanked clean off the truck. Kuroko and Misaka, watching, state that she's in Judgment for a reason.
  • Beyond the Impossible: A little bit of situational usage of AIM Jammers and access to a supercomputer not only lets her change her power, which is something thought to be impossible in the series up to this point, but also dips headfirst into Reality Warper territory when she manages to weaken Kimi's power enough for Mikoto to finally beat her, presumably by shutting off whatever black hole her Dragon was feeding from. That bears repeating: the innocent little Uiharu managed to affect and cripple a Dragon!
  • Cloudcuckoolander: She seems to edge into a state like this whenever she's in front of a computer.
  • Cuteness Proximity: Around Misuko's pet boa constrictor Ekaterina. Amusingly, the snake scared everybody else.
  • Cutting the Knot: When faced with trying to outhack Mikoto, Uiharu doesn't try to do any drawn out battle of the brains or some superhacking - she merely accesses and then deletes all the data before Mikoto can acquire any of it, defeating her in one fell swoop.
  • The Cutie: A small, cuddly and friendly breath of fresh air amongst her zanier friends.
  • Death Glare: When Saten takes a lethal attack for her, Uiharu is overwhelmed with a desire for revenge to the point that she's drawn as nothing but a black blob in the shape of a person. Her boiling rage only subsides when Saten wearily asks her if this is really the path she wants to go down.
  • Delicate and Sickly: In the manga, where she suffers from constant bouts of the flu.
  • Did You Just Flip Off Cthulhu?: In Volume 15 of Index, she taunts the Level 5 Kakine Teitoku, even as he is torturing her, presumably in order to buy time to let Last Order escape. It would have ended very badly for Uiharu if not for Accelerator's subsequent Big Damn Heroes.
  • Early-Bird Cameo: In both openings of the first season of Index.
  • Flowers of Femininity: She wears a headband of artificial flowers on her head, fitting with her girly and soft-spoken personality.
  • Fluffy Tamer: Everyone else took one giant step back upon meeting Mitsuko's snake, Ekaterina. Uiharu stayed behind to coo over it.
  • Get a Hold of Yourself, Man!: In Railgun Episode 23, she suffers a Heroic BSoD when Telestina's true identity is revealed and she takes the children that were experimented on, causing her to break down crying until Kuroko slaps her across the face and asks her...
  • Good with Numbers: In a fit of desperation, she manages to tune AIM Jammers to forcibly mold her Personal Reality into something else, essentially giving her an entirely different ability, something no scientist or supercomputer in Academy City has managed. Given that the Level 5s are all walking supercomputers, this means that her computational skills are at least on par with them.
  • Heart Is an Awesome Power: While initially, her esper power Thermo-Hand doesn't seem very useful besides maintaining the temperature of objects, it's eventually revealed that she can actually outright manipulate temperature, capable of raising or lowering it to whatever level she wants, with the caveat that at Level 1 she only has a normal human-level of resistance to high temperatures. With that in mind, she can also maintain the temperature of one object while altering the temperature of another, such as keeping an ice cube under her shirt to stay decently cool and preventing it from melting while raising the temperature of a room enough to invoke heatstroke on other people.
  • Kawaiiko: Small, cuddly, vulnerable and prone to being the brunt of Saten's off-colored sense of humor and Kuroko's short temper.
  • Laser-Guided Amnesia: In Chapter 49 of the Manga (Railgun T, Episode 4).
  • Little Miss Snarker: Towards Kuroko.
  • Locked Out of the Loop: Has no idea about the Sisters, the Magic Side, or Mikoto and Touma's adventures.
  • Meaningful Name: Her given name Kazari literally means "ornament" or "decoration", while her family name Uiharu means "early spring", referring to the prominent flower headband she wears.
  • Mission Control: Often plays this role due to her mastery of computer work, usually with Kuroko on the other end.
  • Nice Girl: A warm hearted, caring and responsible young lady, with an occasionally cheeky sense of good-natured humor. You still don't want to test her limit, though. Check OOC Is Serious Business trope below.
  • Non-Action Guy: As a trained member of Judgment, she should be an Action Girl with dangerous martial arts training. She... is not. Every time she goes out into the field, she gets hurt, so she stays at the office and plays support. She also can't run very fast or very far.
  • Odd Friendship: With Kuroko. They're close friends and coworkers, but Kuroko goes to an elite school while Uiharu goes to a relatively normal one. Kuroko is also a confident (sometimes to the point of overconfidence) field agent while Uiharu is a Shrinking Violet who usually relies on her extensive hacking skills to act as Mission Control.
  • OOC Is Serious Business:
  • Playful Hacker: She makes hacking into high-security government databases without superpowers look like child's-play, and with a relaxed smile at that!!
  • Red Baron: Known as the "Goalkeeper" among hackers.
  • Sailor Fuku: Her school uniform.
  • Salt the Earth: When she unknowingly caught Mikoto trying to hack into Academy City's main data centre and was unable to stop her, she decided to unleash Omega Secret on the database (or at least made it look like she did), which is an encryption program so complex it would take even Academy City's super computer 200 years to decrypt. In addition, each file is encrypted randomly, meaning each individual file will take another 200 years to decrypt. However, the encryption process is truly completely random, meaning not even Omega Secret itself knows how to decrypt it. So in one fell swoop, Uiharu made the database completely useless not only for Mikoto, but Academy City as well.
  • Selective Obliviousness: When she ran into Last Order, she did not notice her resemblance to Mikoto at all, even though she referred to herself as MISAKA.
  • Shipper on Deck: For Mikoto and Touma. When the two danced, she tried to stop Kuroko from interfering.
  • The Smart Girl: On a technological and technical level, Uiharu is the first and last line of defense our heroes turn to, such is her expertise in the realm of computers.
  • Sweet Tooth: Even more than the others, but circumstances often conspire to prevent her from actually eating them.
  • Utility Magic: Her power is useless in combat, but it's pretty handy for everyday life, such as keeping food warm, as well as advanced scientific purposes.
  • What Kind of Lame Power Is Heart, Anyway?: As the only named Level 1 of the series so far, it's no surprise her ability seems unimpressive. Her power is stabilizing the temperature of everything she touches — in other words, she's a human thermos.