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  • Adorkable: Harumi Kiyama: Super-Deformed mode, after being scolded by Kuroko and Saten for taking off her stained skirt: "But no man would take interest in my flat and unattractive body anyway." Aww...
  • Alternative Character Interpretation:
    • Accelerator: A young man who's trying to redeem himself for the terrible things he has done while trying to avoid turning back to his past self or a sadistic heartless monster who hasn't changed his ways and enjoys being a powerful killer?
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    • Aleister: Is he nothing more than a giant jerkass who loves nothing more than piling up one evil scheme after another? Or a Well-Intentioned Extremist with ulterior motives? His actions would suggest the former, while his backstory leans in the direction of the latter. Revelations in the later light novels suggest that he is indeed a Well-Intentioned Extremist, though one who doesn't deny his own selfish motives.
  • Awesome Music: Has its own page.
  • Base-Breaking Character:
    • Whether Touma is the hero all other heroes should aspire to be, or a horribly preachy Marty Stu. Not helped by how he's perceived by particular detractors as sticking his nose where it doesn't belong, on top of not actually suffering actual bad luck from the Imagine Breaker. Defenders of his Chronic Hero Syndrome points out that he does have flaws, while detractors call his attitude narratively broken.
      • Another (albeit related) point of contention about Touma is just how much of a character he is, or whether he is a character at all and not just a plot device. Some people have noted that even though he always saves the day, he rarely if ever has actually any personal relation to the problem at hand, and that the conflict could have been handily solved by any other sufficiently strong character that just happened to come along, and have argued that this makes him something of a Satellite Character in his own series. Said people are also somewhat divided whether this makes him a Black Hole Sue or not.
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    • There are three separate camps for viewing Accelerator. One, the people who focus on his lethal methods who makes of him a bloody monster. Two, the people who focus on him trying hard to redeem himself even if that means throwing away his life. Three, people who liked him from the start, and don't have to forgive him for anything.
    • Not to be left out, the third main character Shiage Hamazura. There are those who like him for being a true Level 0 unlike Touma who still kicks ass with nothing but wits, guns, and luck (even defeating his own Level 5 Mugino in an epic fashion), which makes him something of an Audience Surrogate like Saten, and they think his relationship with Rikou is very sweet while being amused by his Butt-Monkey status in ITEM before (slowly) gaining more respect from them. There's also the fact he's the first person to truly inconvenience Aleister. On the other hand, there are those who dislike him because he's not that attractive compared to Touma or Accelerator, he's a Level 0 with no cool powers unlike the rest of the male characters of the series yet manages to pull out wins against incredibly dangerous foes, finding his servant boy and Butt-Monkey status for Team ITEM annoying rather than funny, and he defeated fan favorite villain Mugino and scarred her, which brought him a lot of hate from her fans!
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    • The titular Index has her fans who find her and some of her interactions with Touma adorable, but she also receives a fair bit of flak for also displaying rather abusive behavior towards Touma (much of which is provoked by actions beyond Touma's control), exaggerated Big Eater tendencies showing little regard for Touma’s low finances, and seemingly having no purpose than just being in the background, with virtually zero stories focused around her.
  • Big-Lipped Alligator Moment: Index-tan Episode 1 for the second season: Each of Saten's appearances are this.
  • The Chris Carter Effect: A frequent phenomenon among fans. The series has by now introduced so many plot-relevant characters with even more potent powers with their own storylines that many people have trouble keeping up even with character charts. Combine this with the fact that the revelations about Imagine Breaker and the way Espers work have been minimal so far (and many other less important questions haven't been answered either, but rather just raise new questions) and that Character Development has been all but non-existent for the majority of characters as of late (including main character Touma), and that the staff seems to be more interested in working on the spin-offs rather than the main story, and you have a giant chaos that has little potential of eventually wrapping itself up completely.
  • Complete Monster: Terra of the Left is the most violent, self-righteous member of God's Right Seat. Using an ancient magical artifact to manipulate the people of a French town, Terra sends them after Touma Kamijou and cares nothing when the riot causes the brainwashed citizens to be attacked by an Academy City attack force. Revealing his intent to launch a full-scale attack on Japan, Terra shows disdain for all non-Catholic lives and shamelessly admits to murdering "heathen" men, women and children to perfect his magic.
  • Critical Research Failure: The reason why Stiyl looks so old despite supposedly only 14 was because of a miscommunication between the artist and author: Touma and Stiyl's first confrontation was supposed be something of an Old vs New (which the artist took literally to mean "old man vs. young boy"), completely missing the note that said Stiyl was only 14.
  • Ensemble Dark Horse: Mikoto, Kaori, Kuroko and Itsuwa are very popular with the fans, ultimately spawning a franchise of their own.
    • Team ITEM and New Light are very popular among fans despite both groups being the antagonists.
      • Kazuma Kamachi noted in the afterward of NT 12 that to him, Frenda Seivelun was just a one-shot character to be unceremoniously killed, and did not anticipate that she would be so popular to the fans. This led to her getting a big role in Railgun and to her becoming a major plot point in NT 6 and 12 despite being long dead.
    • Now with the second season of Index, Fukiyose Seiri has become very popular with fans on her debut in Episode 8.
    • Accelerator has a huge fanbase due to how Ax-Crazy awesome he is, to the point that a large amount of fans claim HE should be the main character, not Touma.
  • Fandom-Enraging Misconception: Neither the name of Touma Kamijou's ability "Imagine Breaker" nor the Invisible Thing/the Dragon is inspired by the American band Imagine Dragons. A Certain Magical Index first volume came out in 2004, while Imagine Dragons band was formed in 2008.
  • Fanfic Fuel: The sheer size of Academy City, the number of unresolved plot threads, and the nature of Esper and Magic powers involving practically every area of physical science and fairy tale imaginable provides ample room for creating Original Characters and new storylines by eager fans.
  • Fanon: Fans have speculated that the Amakusa Catholic girl that Touma fought and saved from a fall in Volume 7 may be Itsuwa, the Amakusa warrior who was first introduced in Volume 11 which may explain why she has a crush on Touma in the first place. However, the 2nd season anime had it Jossed as it wasn't Itsuwa that Touma saved but another girl.
    • It's also fairly common fanon that Lola Stuart is Index's mother, especially since the two are specifically drawn to resemble each other. This also adds an extra Kick the Dog element to Lola's treatment of Index if you buy that theory.This is disproven by the revelation that Lola is Aleister Crowley's daughter.
    • Fans have theorized for years that Aogami Pierce is the 6th Level 5, by this point they would be furious if it turned out it wasn't him.
    • As a way of hand-waving the aforementioned Critical Research Failure, a somewhat popular interpretation is that Stiyl uses magic to appear older.
    • It is fairly common for the fans to assume the region/district where Touma lives and places Mikoto and her friends visit on regular basis (such as Seventh Mist shopping mall) as the "Light Side" of Academy City. While the term "Dark Side" of Academy City exists in canon, no one actually mention the term "Light Side" in canon storyline either in the main series "Index" or the spinoff "Railgun" and "Accelerator".
  • Fan-Preferred Couple: Majority of the fans who don't ship every and all girls with Touma (which is a significant portion in and of itself) ship him with Misaka. Though after NT 9, a big but lesser part of the fanbase has started shipping Touma with Othinus.
  • Foe Yay Shipping:
    • Touma and pretty much all of his female opponents, be they the ones who actually do grow feelings for him (such as Kanzaki, Agnese, Lessar, and Othinus), the ones who have flirty moments vague or overt (such as Oriana or Carissa), or even those who don't have any such feelings (such as Shelly or Vento). And then there's whatever Thor's got going on...
    • Kakine Teitoku a.k.a. Dark Matter and Uiharu Kazari. Yes. That Uiharu. Despite their first interaction with each other is a bone-chilling one, that didn't stop certain amount of fans from wearing their Shipping Goggles.
  • Franchise Original Sin:
    • Many were livid at JC Staff for not properly adapting Index III, instead making it a Compressed Adaptation, locking out a lot of information. The thing is, JC Staff did the same thing to both Index I and Index 2.note  The difference is, while the first two seasons cut out plenty of information, it was mostly restricted to worldbuilding and extra characterization, and the plot was perfectly understandable otherwise. However, Index III cut out actual plot-relevant action, dialogue, and characters completely. By the time Index III had begun airing (seven years after Index II), plenty of fans had read the light novels and caught up to the series by that point, so now the changes that were made were much more noticable.
    • The Kudzu Plot and Myth Stall is often cited as a reason why the light novels are hard to get into for potential new fans, but at the beginning of the series the sheer amount of characters, factions, and moving parts was what was considered to make the books worth reading in the first place; Kamachi's skill with worldbuilding created a setting where everything felt alive and dynamic and there were plenty of interesting plot threads to explore. But when instead of resolving those plot threads, more and more characters and factions were introduced of increasingly higher power, cutting out any chance at prior characters being fleshed out, that it started to become a problem. Combined with the fact that the novels have reached over 30 volumes with no resolution in sight and it's easy to see why potential new fans would instead be turned away.
    • Touma is one of the most divisive protagonists among most of the fanbase, with many detractors considering him to be a flat, generic Invincible Hero, but most of the reasons cited for that are character traits that were always there but became more apparent the longer the series went on. Touma always was supernaturally durable, possessed a completely overpowered ability, and preached at villains constantly from the beginning, but had quite a few noticeable flaws: his fighting skills only worked against Squishy Wizards and he was easily beaten by those who were skilled at hand-to-hand combat, he took absolutely hellacious punishment even from the fights he won, and the Imagine Breaker had the side effect of making his daily life miserable. All these flaws begin to go away until by the time of New Testament he's convincing a Reality Warper villain to switch sides solely by preaching at her and being the major force behind stopping World War III. This leads to more fans finding him to be genuinely dull and uninteresting, since (as mentioned above) the Kudzu Plot prevented Touma from going through any meaningful Character Development.
    • One of the major criticisms of Shiage is how he wins his fights less by being smart and more through groups of villains passing around the Idiot Ball. This sort of Ass Pull actually occurs fairly early on with Accelerator seemingly forgetting he can just throw cars and rubble at Touma to crush him, but it's easily explainable as Accelerator is Ax-Crazy and might have either legitimately forgotten or wanted to kill Touma in a more humiliating way. In contrast, Shiage's victories are far more contrived and particularly infuriating when they occur because villains who are supposed to be competent grab ahold of the Idiot Ball.
  • Friendly Fandoms: The fandom is on relatively good terms with some other fandoms.
  • "Funny Aneurysm" Moment:
    • Index-tan Episode 2: Himegami is asked what her wish for the second season is. Her response? "Um, I won't ask for my episode, but I just want to be treated more-". Guess what happens in her first lengthy appearance in Season 2? She gets filleted by Oriana Thomson because she thought that Himegami was an agent of Necessarius due to the Celtic cross around her neck.
    • Aogami's perverted tendencies seem less funny when his English voice actor, Scott Freeman, was arrested and convicted of possession of child pornography.
  • Harsher in Hindsight:
    • Academy City's Power Curriculum Program. In theory anyone undergoing this program can become an Esper yet there are still people who have yet to gain powers and even those who did never go a higher level which suggest the program has some problems. However Vol. 22 reveals the program is secretly being undermined by the Higher Ups of Academy City who decide who can and cannot gain Esper powers and/or go a higher level based on the type of the powers that person has. This revelation makes it much worse once you realize Level 0's like Saten, the Skill Out gang members who are actually nice people such as Wataru and low level espers like the Level Upper users, who work hard to gain powers/higher levels but never can because their training is being sabotaged as the Higher Ups see no point of helping anyone who doesn't have the powers they want. That's right, the city is responsible of destroying the dreams of many students and leading them into path of cynicism and crime. Particularly harsh since the Program prevents anyone who goes through it form learning magic, even if they don't get anything out of it.
    • All intentional; while Mikoto claims in SS: Liberal Arts City that Academy City has no intentions of taking the world via military force, the revelation via Chapter 22 suggests otherwise. Why else would you try to make an army of level 5s or an "interceptor" aircraft that has the ability to fly halfway around the world and level a city single-handedly? Basically, the reason why the corporate crooks of AC haven't bothered leveling the level zeros of their population isn't just because they don't want to, its because they need cannon fodder; they needed a group of disgruntled individuals who they knew would resort to violence in order to defend themselves against those termed and rewarded for being genetically superior, so that they might label that group as people on whom it is okay to use your powers, people whom it is okay to murder, because no one will care about them due to their collective reputation.
    • The Russia arc has a storyline where Shiage helps a village from being taken over by hostile militia forces without any visible uniforms is one if you think about how the Crimea occupation started in 2014.
  • Hilarious in Hindsight:
    • This AMV shows Accelerator as a singer of rock band. Then in 2015, came a new spin-off manga titled "To Aru Idol no Accelerator-sama" staring Accelerator as an Idol singer.
    • A big reason for Princess Carissa's coup d'etat against her mother in Volumes 17 & 18 is that she believes the United Kingdom has become too stifled by the European Union and having its rights infringed upon with impunity by a corrupt alliance deep in the Roman Catholic Church's pockets, and wants to break free of it by force. In June 2016, the real United Kingdom voted by referendum to leave the European Union peacefully, and by the end of January 2020 actually did leave.
  • Iron Woobie: Touma gets his ass kicked on a regular basis, and even the fights he wins tend to end with him in the hospital. There's no real explanation for why he puts himself through such misery, especially considering he has his own inherent bad luck to deal with. And yet he claims to be happy with way he lived his life...
    • The novels explain all of this in detail... eventually. Volume 22 summarizes it quite nicely, though NT volume 9 best outlines his "real motivations." NT volume 9 partially trolls and explains that Touma doesn't really believe half of the "hero speeches" that he gives to villains. He just does this to briefly get through to people who have temporarily gone crazy as a result of experiencing severe loss/tragedy in their lives. As of NT volume 9, he has a higher moral ground and it is actually justified because of what he went through...
  • Launcher of a Thousand Ships:
  • Les Yay: Mikoto and Kuroko, though mostly on Kuroko's end. Mikoto's more annoyed at it than anything, but on occasion (when Kuroko isn't being obsessive about it), she does return it.
    • Misaka WORST and Umidori.
    • Kuroko admits that she would love to have both Misaka and at least 1,000 of the clones to herself.
    • Kanzaki Kaori and Index, more so in the first arc and in their past.
    • Index and Kazakiri Hyouka. Hyouka notes that Index acting Tsundere for Touma is a sign that she loves him. Then, much to Hyouka's surprise, Index acts the exact same way towards her.
    • Kanzaki and Orsola.
    • With some Foe Yay Shipping, Oriana towards Himegami and Fukiyose.
    • New Light, particularly Bayloupe and Lessar, though Floris and Lancis aren't exactly innocent either. The group seems the be well aware of their apparently abnormal closeness too.
      Floris: "Hey, you two lesbians who look like you’re from some erotic novel or something." note 
      Lessar: "Floris! Lancis!! Quit awakening strange new tendencies and wake up! We need to use this room!!" note 
    • Mikoto and Misaki, carrying over from the spin-off it got started in.
    • At this point, To Aru needs its own page.
  • Memetic Mutation:
    • George R. R. Martin is helping write the series. Explanation 
    • OTP Explanation 
    • Maid spin, maid spin, maid spin...note 
    • Hothinus note 
    • To Aru Majutsu NO Index due to Index being Out of Focus and Touma taking the main character role despite Index being the title character.
    • Normal high school boy/normal magician.note 
  • Moe: Several characters count.
    • Special mention goes to Komoe-sensei, which is even in her name. She's also not above invoking this trope in order to guilt her students into doing things.
    • Quite a few of the Sisters, but 19090 stands out. She's a minor side character, but in her first appearance (when the four Sisters still in Academy City were getting sized for their winter uniforms), the others discovered that she wasn't quite as identical as she was supposed to be, due to reading girly magazines and dieting. She runs away tearfully, while her Sisters hunt her down ruthlessly in an attempt to measure her more precisely and force her to fix her eating habits.
  • Moral Event Horizon:
  • Most Wonderful Sound:
    • The noise Imagine Breaker makes when it negates something.
    • The sound effect of Accelerator's Attack Reflector.
  • Narm:
    • Apparently, Accelerator can state-change air into plasma by making ridiculous noises with his mouth, another form of his evil laugh. This is also a case of Formulaic Magic; those noises he was making were Accelerator performing the calculations necessary to use his Vector powers at high speeds... which does nothing to make them less ridiculous. Things get even more hilariously confusing when it is later revealed that those sounds are in fact a very basic form of the language spoken by Holy beings such as angels, which is why he's able to harness so much extra power whenever he makes them.
    • Every feeling of suspense or mystery when Kazakiri's Artificial Angel form appears is destroyed when they show her face, with her tongue hanging out and her eyes rolled back up. It doesn't help that it looks exactly like the so-called "ahegao face", a common and rather memetic phenomenon in Hentai, which just makes it look even more silly and out of place. Admittedly, it does get more awesome when she actually has control of it and starts chucking around attacks powerful enough to stand up to Archangel Gabriel.
  • Never Live It Down: No matter how much good he does or how many heroic acts he does, some fans still hate and can never forgive Accelerator for the terrible things that he's done, especially what he did to the Sister Clones before his Heel–Face Turn.
  • Seasonal Rot: Fans of the series had been clamoring for a third season of the anime for almost a decade, and in 2018, it finally premiered, then became an instant example of Be Careful What You Wish For among the fandom, since it was an extremely Compressed Adaptation that at some points didn't even make any sense to those who hadn't already read the novels.
  • "Seinfeld" Is Unfunny: Index provides one of the earliest examples, and one of the major Trope Codifiers, of the Stock Light-Novel Hero archetype. Because of this, many people trying to get into the series now (after the genre has become one of the most saturated in the medium) find it hard to see past its generic over-powered hero, the bevy of beautiful girls vying for his attention, or its Extranormal Institute setting. However, being from a time before those formulas became standardized, it also has many elements of a Shōnen series, as well as a greater emphasis on World Building and extremely entertaining fight scenes, which people who dismiss it at-a-glance may miss out on.
  • Ships That Pass in the Night:
    • It's rather surprising how many fans pair up Fiamma and Carissa, considering their single canon interaction was an I Shall Taunt You on Fiamma's part followed by him trying to finish her off.
    • Some of Touma's ships can be like this, since the most you can say of some of their interactions is that Touma punched them while giving them a dressing down (such as Vento x Touma). Heck, some of them haven't even had an embarrassing perverted moment with him in canon yet!
      • Touma and Saten get paired in a surprising amount of fanfics, despite the fact that they've only met face-to-face when he borrowed her good luck charm for the Daihasei Borrowing Race. Probably because they're both normal (mostly) and that Saten's protection charm actually managed to negate Touma's bad luck for once.
  • Ship-to-Ship Combat: Which girl should be with Touma? Don't ask! because the moment you say so, you will get yourself in a nasty Ship-to-Ship Combat between other fans over their favorite girl!
  • Squick:
    • How does the Roman Catholic Church counter Sheol Fear, a sound-based spell? Whipping out fountain pens and gouging out their ears.
    • Numerous panty shots, nude scenes and skimpy dresses from characters who either are or at least appear to be early teenage girls.
  • Visual Effects of Awesome: The first opening video for Index anime adaptation features Staggered Zoom of various scenes:


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