This is the page for the primary four characters of the ''LightNovel/ACertainMagicalIndex'' spinoff ''Manga/ACertainScientificRailgun''.

To return to the main ''Index'' character page, go [[Characters/ACertainMagicalIndex here]].

[[folder:Mikoto Misaka]]
!!![[MagneticWeapon The Railgun]]''/''[[TheAce The Ace of Tokiwadai]]''/''[[ShockAndAwe The Electric Princess]]
[[caption-width-right:300:'''[[LittleMissBadass CAUTION]]''' ''':''' '''[[ShockAndAwe HIGH VOLTAGE]]''']]
->'''Voiced by:''' Creator/RinaSato (Japanese) and Creator/BrittneyKarbowski (English)

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

!!Provides examples of:

* AccidentalMisnaming: 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.
* ACupAngst: 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 PlayedForLaughs 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.
* TheAce: 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.
* ActionGirl: She has slightly violent tendencies, and is ranked third among the Level 5 Espers.
* AlliterativeName: '''Mi'''koto '''Mi'''saka
* AllLovingHero: Sort of becomes one in the anime-exclusive arc in ''Railgun S''.
* ArmorPiercingSlap: Subverted. Try as she might, Mikoto just cannot get a hit in on Touma.
* AscendToAHigherPlaneOfExistence: [[spoiler: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.]]
* AxCrazy: In Episode 4 of ''Railgun'' against Touma.
* BadassAdorable: 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.
* BatmanCanBreatheInSpace: 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.
* BelligerentSexualTension: 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.
* BerserkButton: There are only two things that make her angry enough nearby objects start sparking: threats to the Sisters, and Touma.
* BigDamnHeroes: [[spoiler:Twice to Lessar in the second ''Railgun SS''.]]
* BigSisterInstinct: Loves the Sisters as though they really ''are'' her siblings, and would go to hell and back to protect them. [[spoiler:Which is exploited by Gensei Kihara.]]
* BloodKnight: Though more from her inability to forgive slights than actual bloodlust, because she will forgive you ''after'' pounding your ass in.
* BlushSticker: At times, especially as a child, if Last Order is any proof.
* BreakingTheFourthWall: 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!?"
* BreakoutCharacter: She started as just another GirlOfTheWeek, 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.
* BreakTheCutie: During the Sisters Arc, resulting in a HeroicBSOD.
* BroughtDownToBadass: 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 [[spoiler: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.]]
* CannotSpitItOut: To Touma.
* CharacterDevelopment: 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.
* ChronicHeroSyndrome: 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.
* ClingyJealousGirl: 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 ''LightNovel/ACertainMagicalIndex'', she gets angry with him.
* CloningBlues: [[Characters/ACertainMagicalIndexSisters The Sisters]].
* CodeName: See above.
* CoolBigSis: 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.
* CryCute: Breaks down crying while she cradles a hideously injured Touma in her lap after brutally electrocuting him, realizing his point about the futility of [[spoiler:trying to fight Accelerator to the death, noting how it will ultimately solve nothing.]]
* CunningLinguist: Besides Japanese, she knows other languages like English, French, and Russian. [[spoiler: It comes in handy when communicating with the French-speaking Cendrillon.]]
* CutenessProximity: 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.
* DeathSeeker: [[spoiler: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 [[YouShallNotPass 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.]]
* DespairEventHorizon: During the Sisters arc, she constantly sacrifices sleep and fights constantly to the point of nearly passing out to stop the project. [[spoiler: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.]]
* DoubleStandardAbuseFemaleOnMale: 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 [[AntiMagic on you anyway!]]
* TheDreaded: Once delinquents realize that they are trifling with ''The Railgun of Tokiwadai'', the smart ones will ''invariably'' [[OhCrap drop their weapons]] and [[ScrewThisImOutOfHere run in terror.]]
* ElectricTorture: PlayedForLaughs as a RunningGag -- this is how she usually rebuffs [[PsychoLesbian Kuroko's]] attempts to [[LovableSexManiac make out with her]].
* ElegantClassicalMusician: [[ Yup.]]
* EmbarrassingNickname: Touma used to call her "Biri-Biri" ("Bug-Zapper"), a name she doesn't like.
* EnmityWithAnObject: 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.
* EroticDream: Has one of Touma in the beginning of Season 2 Episode 17.
* EvenTheGirlsWantHer: Much to her chagrin. During the school festival episode multiple students try to give her gifts.
* FailureIsTheOnlyOption: [[spoiler:All her attempts to stop Level 6 Shift are squashed by Academy City's administration before Touma lent a hand.]]
* {{Flight}}: When she's over a body of water, she performs hydrolysis on the water particles so she can propel herself and fly.
* GlassCannon: 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 [[LampshadeHanging lampshades]] that it´s hard to hit someone with a face like that.
* GoofyPrintUnderwear: 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... [[TooDumbToLive then she just had to sing that aloud]]. This is perhaps the reason Mikoto wears ModestyShorts.
* HairDecorations: 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.
* HairFlip: On occasions.
* HairTriggerTemper: 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, chronologicaly); that said, she WILL forgive (and even befriend) you ''after'' she has exacted vengeance by pounding you into the ground.
* HardWorkHardlyWorks: 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, [[spoiler: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 DoubleSubversion, 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.]]
* HeIsNotMyBoyfriend: She gets put into this situation by Index, her friends, in front of Touma and their parents too (cue [[LuminescentBlush massive blushing]]). She keeps denying it, but [[EveryoneCanSeeIt no one believes her.]]
* TheHero: Shares this trope with Touma in her own series.
* HeroicBSOD: After seeing one of her sisters die and being unable to do anything to stop it.
* HeroWithBadPublicity:
** A plot point during the Shopping Mall Demonstration SS. [[spoiler: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 MuggingTheMonster because [[spoiler:if she wasn't TheFettered, 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.
* HeyYou: She has yet to call Touma by his name. [[spoiler:Save the PSP game intro]]
* HighPressureEmotion: In more comedic scenes, she is prone to sudden puffs of steam to accompany her {{Luminescent Blush}}ing to emphasize how vulnerable and embarrassed she is about feeling romantic-love towards Touma.
* HonorBeforeReason: She has a big problem with asking others for help.
* HotBlooded: More so than the comparatively laid-back Touma.
* HypocriticalHumor
** 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'.
* IAmNotLeftHanded: 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).
* IdentityAmnesia: [[spoiler:She forgets who she is in her angel form]].
* IdiotHair: 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.
* ImmuneToMindControl: Thanks to her high bioelectricity content, she is immune to mind control and mind reading.
* JerkWithAHeartOfGold: 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.
* KindheartedCatLover: 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.
* LastNameBasis: 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") [[FirstNameBasis she's almost exclusively referred to as Mikoto]].
* LimpAndLivid: Accompanied by furious shaking whenever she is about to go ballistic on Kuroko for her latest act of immature stupidity.
* LittleMissBadass: 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.
* LockedOutOfTheLoop: Is constantly left out of Touma's adventures. Even late into the New Testament series, she doesn't know about Imagine Breaker and thinks Touma can just negate things in general.
* LoveAtFirstPunch: Mikoto became interested in Touma after he first blocked her electricity while she was zapping some delinquents.
* MagnetismManipulation: 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 [[ChainsawGood chainsaw]] out of [[ImprovisedWeapon iron filings]] or cling to metal surfaces. Even her signature Railgun is based on generating a powerful electromagnetic field.
* TheMcCoy: Between Touma's [[TheKirk Kirk]] and Accelerator's [[TheSpock Spock]]
* MegatonPunch: The most common method to stop a clingy Kuroko.
* MistakenForGay: 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!''
* ModestyShorts: The trope picture. Much to [[PsychoLesbian Kuroko's]] dismay.
* MsFanservice: Side by side with Kuroko, she is most often portrayed in shower scenes and situations that show/emphasize her trim-and-firm, athletic figure.
* MundaneUtility
** 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.
* NamesToRunAwayFromReallyFast: She's called the Railgun and is a Level 5. What did you expect?
* NewTransferStudent: [[spoiler:In New Testament 5, she's planning on taking the entrance exam for Touma's school.]]
* NoGuyWantsToBeChased: 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 VitriolicBestBuds treatment.
* NoSell
** 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, [[spoiler: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.
* ObliviousToLove: She's actually oblivious to her ''own'' love. It takes her until [[spoiler:Volume 16]] to realize that she likes Touma.
* OffhandBackhand: In her fight with Touma during the SportsFestival (when [[spoiler: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 [[spoiler:the Windowless Building]]. It doesn't work, because it's [[AntiMagic Touma]], but she still treats him as a persistent fly rather than a serious threat.
* {{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 habits and is annoyed that everyone expects her to be a proper lady.
* OneManArmy: 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.
* OneWingedAngel: [[spoiler:Beginning the Level 6 Shift comes with an appearance shift into a demonic form. She becomes less human looking as time goes on.]]
* OneeSama: To Kuroko and a legion of admirers.
* OnlySaneMan: 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, Misaki is paranoid and abuses her powers, Gunha is 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.
* OOCIsSeriousBusiness: Kuroko gets extremely worried whenever Mikoto ''doesn't'' zap or reject her.
* OurAngelsAreDifferent: [[spoiler:In chapter 61 of the ''Railgun'' manga, she begins to Awaken to her angel form when fused with the MISAKA network]]. In the next chapter, while she is only [[spoiler: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.]]
* OutOfFocus: In the ''Index'' series, where, despite often being billed as a main character, she hasn't been very plot relevant since the Sisters Arc.
* RecognitionFailure: Despite being the face of Academy City, the average citizen does not recognize her on sight, and many street thugs [[MuggingTheMonster assume she is just a helpless girl and try to mug or sexually harass her]].
* RedOniBlueOni: The Red to Touma's Blue.
* RequiredSecondaryPowers: 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?
* TheRival: 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.
* RunningGag: Her love of things considered childish, including Gekota (a Franchise/HelloKitty like character) GoofyPrintUnderwear, childish pajamas and a ruffly swimsuit, all of which she denies when asked about.
* SelfMadeMan: Mikoto climbed all the way from Level 1 to Level 5 through hard work, but [[spoiler:this is also subverted when it was revealed that Academy City's higher-ups can predict an esper's development.]]
* ShesGotLegs: The camera loves to focus on this fact as much as Kuroko.
* ShrinkingViolet: Occasionally when around Touma.
* ShockAndAwe: The nature of her abilities. She's called "Railgun" for a reason.
** ConvectionSchmonvection: Averted in ''Railgun'' Episode 12 where, against an opponent deploying a barrier that nullifies electric shock, Misaka uses the massive amounts of heat generated by her lightning to ''melt the thing''.
** CursedWithAwesome: Has a constant electrical field around her and cats won't go near her because of it.
** ExtraOreDinary: Can use her lightning abilities to control magnetism and therefore control metal. She can even use iron sand to make a [[WhipSword Whip]] [[ChainsawGood Chainsaw]]!
** FinishingMove: Her railgun was called as such a few times.
** HollywoodHacking: She can use her powers to directly interface with electronics and hack them.
** KillSat: She can more or less drop cloud-to-ground lightning on targets. [[spoiler:And there's the bolt she drops in chapter 62.]]
** MoneyToThrowAway: Her Railgun uses coins which she can launch at three times the speed of sound using her electricity.
** PowerIncontinence: Whenever she gets angry she usually short-circuits an entire block.
** SelectiveMagnetism: An integral part of her railgun.
** {{Teleportation}}: [[spoiler:She can teleport herself when she's in her angel form, though exactly how this works is not examined in depth.]]
** WallCrawl: By magnetizing herself, she can stick to walls and ceilings. Mugino nicknames her "Spider-Woman" for it.
** WaveMotionGun: Her railgun, full stop.
* ShootingSuperman: In an early episode, the opponent of the week attempts to use a taser on her.
* ShownTheirWork: Unlike most of the {{Technobabble}} in the series, Mikoto's railgun is actually surprisingly plausible. The effects shown fall into ArtisticLicense 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 DramaticWind.
* ShutUpHannibal: Delivered to [[spoiler:Therestina]] via railgun.
* StalkerWithoutACrush: 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 be beat him since he always nulls her power and then apparently leaves. The one time he looks like he might fight back, she cowers away from his raised fist and he just gives up. [[DontYouDarePityMe Pissed at being looked down]] as a level five who has never had to really try to beat anyone in a fight, she starts chasing him around even more than usual.
* StrongFamilyResemblance: To her mother.
* {{Shorttank}}: And one who is quite embarrassed to show any sort of girlish behavior at that.
* SuperMode: In chapter 61 of the Railgun manga, [[spoiler:Misaki's Exterior is used to force Mikoto to join with the MISAKA network in another attempt at a [[PowerLevels Level 6 Shift]].]]
* SwissArmySuperpower: Normally, you'd consider generating electricity to be a fairly limited power. However, it's proven quite flexible.
** She can of course zap you directly.
** If someone attempts to employ a resistor, then just like in real life that energy has to go ''somewhere'', so it just heats up instead.
** She can manipulate current in order to create a railgun in the air and fire small objects with it, coins being her favorite. This is the source of her nickname.
** Electric current running through her body makes her immune to electrical attacks and external mind reading or mind control effects that tamper with the brains bioelectricity. Strong attempts to control her do cause a degree of pain, however.
** Control of electricity equals control of electro''magnetism'' apparently, so she can can control metal to make weapons and shields or walk on surfaces that have metal in them. This could be an iron reinforced concrete wall, or it could just as easily be something that's magnetic but moving far too quickly for a normal person to stand on [[spoiler:like a plane wing.]]
** Being able to control electricity also makes her a supremely capable and quick hacker, even of military grade equipment with far more security than our own.
** She never does it herself [[spoiler: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 put out jamming frequencies, though apparently it's 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.
** Finally, she passively generates electricity at all times, which functions 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.
* TearsofJoy: 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.
* TomboyAndGirlyGirl: The tomboy to Kuroko's girly girl.
* TomboyWithAGirlyStreak: 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 gekko items, and she likes large stuffed animals.
* TriggerHappy: 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, OneeSama?
* {{Tsundere}}: Type A towards Touma. [[{{Cloudcuckoolander}} Kiyama]], of all people, actually lampshaded it.
* UnknownRival: 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.
* UnstoppableRage: [[spoiler: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).]]
* WeirdnessCensor: 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.
* WhenSheSmiles: In Railgun S when the storyline starts to merge with [[ForegoneConclusion Index's Sisters arc]], after [[spoiler: six episodes of running herself extremely ragged, not sleeping or eating, all to try to stop the Level 6 Shift project.]]
* WideEyedIdealist: At first, she had an idealistic view about Academy City. However, after the events of the [[spoiler: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.
* WithGreatPowerComesGreatInsanity: [[spoiler:Implied. Gensei Kihara states that once she's 53% of the way to Level 6, she will lose her human personality.]]
* WorldOfCardboardSpeech: In ''New Testament'' Volume 6, when she explains why she's helping Touma [[spoiler:to her opponent, the Valkyrie Brunhild Eiktobel.]]
--> [[spoiler:You don't need a good reason to save a friend. If you want to save them, then save them. …I know someone who kept saying those stupid things even when he was driven to the brink of death, and he really did save over 10,000 people in the end. And that idiot that saved so many people is trying to save someone today like always. I know I can't stop him. No matter how much I don’t want him to do anything dangerous, seeing him off with a push to the back is the sign of a good woman!!]]
* WrestlerInAllOfUs: One of her methods to stop a clingy [[PsychoLesbian Kuroko]].
* YouAreNotAlone: [[spoiler:When she properly reunites with Touma in ''New Testament'' Volume 2, she says this to him. WordOfGod states that she's now "entering the fight", meaning she's going to involve herself with Touma's adventures with the Magic Side. Sadly, she got dumped in the very end of ''New Testament'' Volume 3. Of course it didn't stop her from helping him in ''New Testament'' Volume 6.]]

[[folder:Kuroko Shirai]]
!!Kuroko Shirai
->'''Voiced by:''' Creator/SatomiArai (Japanese) and Creator/AlisonViktorin (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 "OneeSama" ("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).

!!Provides examples of:

* AbhorrentAdmirer: 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.
* AlphaBitch: Her attitude at times.
* AmusingInjuries: It seems [[Manga/CityHunter Ryo Saeba's]] problem also applies to ''female'' perverts.
* ArbitrarySkepticism: 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.
* AuthorityEqualsAsskicking: One of the most active members of Judgment and one of the most effective.
* AwesomenessByAnalysis: To teleport, she has to make calculations on factors like mass, volume, vector, etc. Also her fight against the thug that could create illusions.
* BackToBackBadasses: With Mikoto ''and'' [[spoiler:[[RivalsTeamUp Mitsuko]].]]
* BadassAdorable: 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''.
* BarelyThereSwimwear: Her outfit in ''Railgun'' Episode 13 shocked everyone by how ridiculously small it was.
* BatmanCanBreatheInSpace: 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.
* BeautyIsNeverTarnished: 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.
* BorrowedCatchphrase: During the last episode of ''Railgun S'', [[spoiler:every single member of Judgment]] uses her CatchPhrase.
-->'''Konori:''' [[LampshadeHanging We're gonna do this Shirai's way]].\\
'''Everyone:''' WE'RE FROM JUDGMENT (DESU NO)!\\
'''Kuroko:''' ''Hey!''
* BunnyEarsLawyer: 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)!"
* CatSmile: She often has this expression, usually just before planning something perverted. This usually involves her OneeSama Mikoto.
* TheCavalryArrivesLate: 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.
* CharacterExaggeration: 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.
* ChewingTheScenery: And Creator/SatomiArai is having a ''whale'' of a time playing this lovable psycho!
* ClingyJealousGirl: 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.
* CryCute: PlayedForLaughs as a RunningGag every time Mikoto gives her either the cold shoulder or the jolt.
* ADayInTheLimelight: The Remnant arc in the ''Index'' series (Volume 8 in the novels / Season 2 Episodes 6-7 in the anime).
* DemotedToExtra: 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.
* TheDeterminator: Overlooked a lot, but her actions in the Tree Diagram Remnant arc more or less confirm her as one.
* ElectricTorture: How Mikoto usually rewards her attempts to make out with her, and always PlayedForLaughs.
* EroticDream: Often gets them of Mikoto.
* EveryoneHasStandards: 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.
* ExpressiveHair: Her pigtails.
* FilleFatale: A bit too sexually aggressive for a ''thirteen-year-old'' girl for comfort...
* FieryRedhead: Though less violent tempered than most girls of this trope, Kuroko still has the melodramatic and passionate personality that's typical of it.
* ForgotAboutHisPowers: 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.
* FriendToAllChildren: 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.
* GirlishPigtails: Always does her hair like this.
* HardHead: She would already be a vegetable were it not for this trope, considering how she ''normally'' [[ deals with]] [[ stress and/or]] [[ frustration]].
* HandicappedBadass: She was confined to a wheelchair for a while. Then she teleports ''with the wheelchair'' and uses it '''as a weapon'''.
* HateAtFirstSight: She immediately views Touma as her rival for Mikoto's affections.
* HiddenDepths: 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.
* HypocriticalHumor:
** After Kiyama [[InnocentFanserviceGirl 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.
* IfItsYouItsOkay: 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 ClosetKey.
* ImprobableWeaponUser: 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.
* IncompatibleOrientation: She doesn't seem to get that Mikoto is straight.
* JapanesePronouns: Uses "watakushi", the more formal form of "watashi", as a first-person pronoun, which is linked to her being an {{Ojou}}.
* JerkWithAHeartOfGold: 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 OneeSama 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.
* TheLancer: To Misaka Mikoto.
* LargeHam: One gets the feeling that Kuroko is a graduate of the Creator/KennethBranagh school of acting, replete with flowery speeches and constantly MilkingTheGiantCow.
* LaserGuidedAmnesia: Chapter 49 of the manga.
* LeeroyJenkins: 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....]]
* LockedOutOfTheLoop: Has no idea of the Sisters or Mikoto and Touma's adventures.
* LovableSexManiac: 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 [[BuxomIsBetter already got fixated on the latter's assets]], complete with [[RedEyesTakeWarning glaring red eyes]], and probably would have [[ThanksForTheMammaries taken a grab]] real fast were she not bound to a wheelchair after a particularly brutal fight with [[spoiler:Awaki.]]
* MaliciousMisnaming: She hates Touma, so she almost always refers to him as "The Ape" or "The Troglodyte".
* MeaningfulName: Her name literally means "Black Girl White Well", highlighting the contrast between her cutesy facade and perverted personality. Mikoto even [[LampshadeHanging 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", 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.
** 'Kuroko' is also the Japanese rendition of Schwarzschild, as "-ko" can also be translated into the kanji for 'child', 子, and Schwarzchild the name of an astrophysicist famous for his work on General Relativity and black holes. The link should be obvious.
* MomentKiller: 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.
* MsFanservice: 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.
* MurderTheHypotenuse: PlayedForLaughs regarding Touma, even after he saved her from [[spoiler:Awaki.]]
* NeverBeAHero: She constantly scolds Mikoto for stepping in and helping, saying civilians should stay back and leave the heroics to Judgment and Anti-Skill.
* NoSenseOfPersonalSpace: Will take any opportunity to try to kiss or grope Mikoto.
* NotQuiteFlight: 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. [[spoiler:She can even do it from the upper atmosphere, allowing Mikoto and herself a safe trip back in ''Railgun S[='=]s'' finale.]]
* TheNudifier: She can teleport someone's clothes off them. See PowerPerversionPotential.
* {{Ojou}}: Her ''highly'' refined and ladylike speech-pattern fits this trope perfectly. On the other hand, she possesses some decidedly '''un'''ladylike tropes.
* OneManArmy: Due to her ''very'' intelligent use of her already flexible power.
* OOCIsSeriousBusiness: Mikoto gets worried when Kuroko ''stops'' acting perverted towards her.
* PantyThief: Her collection of really kinky panties contains only one normal pair, stolen from her "[[OneeSama onee-sama]]".
* PetitePride: Shows no angst whatsoever about being the least endowed amongst her friends, though that doesn't stop her from being [[HelloNurse stunned with admiration]] at the sight of [[StupidSexyFlanders Mii in a swimsuit.]]
* PowerPerversionPotential: Which she uses to her full advantage.
* PsychoLesbian: 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.
* ReasonableAuthorityFigure: Were it not for her perverted streak, Kuroko is ''the'' picture of a responsible, by-the-book cop in Judgment.
* TheReasonYouSuckSpeech: Delivers a beautiful one to [[spoiler:Awaki, prompting a VillainousBreakdown.]]
* SchoolgirlLesbians: Although it plays a minor part in ''Index'', it's cranked up a notch in ''Railgun''.
* ShamelessFanserviceGirl: If it's for her "onee-sama", she'd be more than happy to be ''really'' kinky around her.
* ShesGotLegs: Boy howdy! And the camera ''loves'' to remind us of that whenever she's in flight or arming the darts strapped to her thighs!
* SingleTargetSexuality: 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 [[spoiler: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.
* StealthHiBye: Does the bye part then the hi part in the first ''Index'' opening.
* TeenGenius: Can do 11th dimensional vector calculations.
* {{Teleportation}}: Her Esper power, "Teleport".
* TeleFrag: 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.
* ThinksLikeARomanceNovel: Is prone to endearingly romantic fantasy-segues, such as her and Mikoto taking the roles of Creator/IngridBergman and Creator/HumphreyBogart respectively in the "We'll always have Paris" misty-runway farewell of ''Film/{{Casablanca}}''.
* ThirdPersonPerson: On occasions.
* TomboyAndGirlyGirl: With Mikoto; she's the girly girl.
* TooKinkyToTorture: 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 [[ElectricTorture whip]] of OneeSama's love!
* UnknownRival: Touma is oblivious to how much she wants to get him out of the way so she can have Mikoto all to herself.
* VerbalTic: "Desu no".
* VocalDissonance: 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.
* {{Yandere}}: PlayedForLaughs, in relation to both Mikoto, whom she admires, and Touma, whom she detests.

[[folder:Ruiko Saten]]
!!Ruiko Saten
->'''Voiced by:''' Creator/KanaeIto (Japanese) and Creator/BrinaPalencia (English)

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

!!Provides examples of:
* AdaptationalCurves: In the anime, her cup size tends to go up a couple grades when her shirt comes off.
* AscendedExtra: 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). [[spoiler:She comes back in the Daihaseisai arc in the manga, managing to wander into an area she really shouldn't and meeting Xochitl.]]
* AudienceSurrogate: The only unambiguously "normal" human in the entire franchise.
* BatterUp: Occasionally carries an aluminum baseball bat. ''Even to the FinalBattle in S2''.
* BlowYouAway: Normally she's a level 0, but when under the effects of Level Upper she seems to gain some sort of wind ability.
* BornLucky: She has a lot of lucky moments, for example being able to track down the bank cards with ease. [[spoiler:Then she gives [[BornUnlucky Touma]] her good luck charm during the Daihaseisai and it '''[[BeyondTheImpossible gives him luck]]'''.]]
* CanonImmigrant: Finally appeared in the main ''Index'' story in TheMovie, and is introduced to the light novels in ''New Testament'' volume nine.
* ChekhovsGunman:
** [[spoiler:It's ''because'' she's a Level 0 that she’s immune to the paralyzing [[BrownNote "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, [[spoiler: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.]]
* DespairEventHorizon: [[spoiler:After she uses Level Upper and realizes she'll fall into a coma soon afterwards.]]
* EarlyBirdCameo: Appears in both openings of the first season of ''Index,'' despite having never appeared in the novels.
* TheEveryman: As above, Saten is a mere mortal amongst gods and angels, and the easiest character in the ''To Aru''-verse to relate to, hence her surprising popularity.
* {{Fangirl}}: Of TeenIdol Hajime Hitotsui.
* FlowerInHerHair: A distinctive white-flower hairclip that is her signature accessory.
* TheGadfly: 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.
%%* GenkiGirl:
* HeroicBystander:
** In ''Railgun'' Episode 1, she saves a little boy from being kidnapped by a bank robber who has powers. [[spoiler:Then, in the finale she smashes the PowerNullifier Telestina is using to incapacitate Mikoto, saving the day.]]
** As of the premiere of ''Railgun S'' she may be heading for ChronicHeroSyndrome. 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, she finally meets Touma [[spoiler: while her memories of Mikoto had been erased]].
* IJustWantToBeSpecial: The poor girl just wants an ability, even if it's only Level 1.
* LaserGuidedAmnesia: Chapter 49 of the Manga.
* LockedOutOfTheLoop: Has no idea of the Sisters or Mikoto and Touma's adventures.
* LongHairIsFeminine: The normal, down to earth girl of the quartet of heroines.
* MyGodWhatHaveIDone: 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.
* MsFanservice: 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.
* MuggleBestFriend: Mostly to Uiharu, but also to Kuruko and Mikoto, since she has no esper abilities herself, something she [[IJustWantToBeSpecial initially hates.]]
* NiceGirl: A romantic dreamer whose greatest joy in life is sharing happiness with her beloved friends.
* NoSenseOfPersonalSpace: Loves to flip Uiharu's skirt just to see her panties, especially if they're in public.
* OddFriendship: She seemed to have developed this with [[spoiler:Xochitl and later Frenda.]]
* PluckyGirl: Brave, optimistic and kind, nothing keeps this girl's spirits down for long!
* RapunzelHair: Not counting Kuroko (who has hers tied up in twin-tails as a rule), Saten's luscious long-black hair falls to her waist.
* SailorFuku: Her school uniform.
* SeizaSquirm: Does this during the festival episode during a tea ceremony.
* ShipperOnDeck: 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.
* ShutUpHannibal: [[spoiler:Stops Telestina's gloating of humanity's supposed worthlessness by smashing the [[BrownNote Capacity Down device]] paralyzing her esper friends with one mighty swing of her aluminum baseball bat.]]
* StepfordSmiler: In Academy City, life is ''hard'' for anyone who doesn't [[PowerLevels "measure up"]].
* TooDumbToLive: She was borderline during the the Railgun SS. [[spoiler: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 [[MakeItLookLikeAnAccident killed]] when Xochitl saved her at the last minute.]]
* YouLeaveHimAlone: [[spoiler:Shouts this to Therestina while smashing the Capacity Down device.]]

[[folder:Kazari Uiharu]]
!!Kazari Uiharu
->'''Voiced by:''' Creator/AkiToyosaki (Japanese) and Creator/CheramiLeigh (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).

!!Provides examples of:
* ACupAngst: When Kuroko comments that her body is "underdeveloped", she gets upset.
%%* {{Adorkable}}
* AscendedExtra: Much like Saten, she's not really all that important outside the first story arc in the original manga. In the anime, her importance is significantly boosted.
* BadassBookworm: 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 [[spoiler: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''.
* {{Cloudcuckoolander}}: She seems to edge into a state like this whenever she's in front of a computer.
* CutenessProximity: Around Misuko's pet boa constrictor Ekaterina. Amusingly, the snake scared everybody else.
* TheCutie: A small, cuddly and friendly breath of fresh air amongst her zanier friends.
* DidYouJustFlipOffCthulhu: In Volume 15 of ''Index'', [[spoiler: she taunts the Level 5 [[Characters/ACertainMagicalIndexDarkSide Kakine Teitoku]], even as he is torturing her, presumably in order to buy time to let Last Order escape. It would have [[KillTheCutie ended very badly]] for Uiharu if not for Accelerator's subsequent BigDamnHeroes.]]
* EarlyBirdCameo: In both openings of the first season of ''Index''.
* FlowerInHerHair: Whenever people ask about the flowers, she'll say she doesn't know what they are talking about. They are a headband of artificial flowers, and she wears it so often that she forgets about it.
* FluffyTamer: Everyone else took one giant step back upon meeting Mitsuko's snake, Ekaterina. Uiharu stayed behind ''to coo over it''.
* GetAHoldOfYourselfMan: In ''Railgun'' Episode 23, she suffers a HeroicBSOD when [[spoiler: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...
-->'''Kuroko:''' [[ArmorPiercingQuestion When are you gonna stop crying?!]]
* IllGirl: In the manga, where she suffers from constant bouts of the flu.
* {{Kawaiiko}}: Small, cuddly, vulnerable and prone to being the brunt of Saten's off-colored sense of humor and Kuroko's short temper.
* LaserGuidedAmnesia: In Chapter 49 of the Manga.
* LittleMissSnarker: Towards Kuroko.
* LockedOutOfTheLoop: Has no idea of the Sisters or Mikoto and Touma's adventures.
* MissionControl: Often plays this role, usually with Kuroko on the other end.
* NiceGirl: A warm hearted, caring and responsible young lady, with an occsaionally cheeky sense of good natured humor.
* NonActionGuy: As a trained member of Judgment, she ''should'' be an ActionGirl with dangerous martial arts training. 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.
* OOCIsSeriousBusiness: Ruiko knows something is wrong when Uiharu ''doesn't'' react with embarassment to her skirt getting flipped up.
* PlayfulHacker: She makes hacking into high-security government databases ''without'' superpowers look like child's-play, and with a relaxed smile at that!!
%%* PluckyGirl
* RedBaron: Known as the "Goalkeeper" among hackers.
* SailorFuku: Her school uniform.
* SaltTheEarth: 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 to 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.
* SelectiveObliviousness: When she ran into Last Order, she did not notice her resemblance to Mikoto at all.
* ShipperOnDeck: For Mikoto and Touma. When the two danced, she tried to stop Kuroko from interfering.
* TheSmartGirl: 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.
* SweetTooth: Even more than the others, but [[RunningGag circumstances often conspire]] to prevent her from actually eating them.
* UtilityMagic: 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.
* WhatKindOfLamePowerIsHeartAnyway: 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.