Due to language and adaptation barriers, nearly all popular anime is subject to {{fanon}} levels proportional to their age; ''Franchise/SailorMoon'' and ''Manga/RanmaOneHalf'' are two notable examples. The advent of the Internet has made fact-checking much easier. It has not, however, stopped flame wars about favored characters or plot lines based solely on fanon. Some tropes, such as Akane Tendo's (of ''Ranma ½'') supposed psychotic tendencies, have been so over-elaborated-upon by fans that they become psychotically defensive of their incorrect beliefs. On the other hand, cultural and literary differences on the very notion of what's "canon" means that there's considerable room for fanon to grow. A notable example would be ''Franchise/{{Gundam}}''.

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* ''Manga/MyHeroAcademia'': It's usually believed that Todoroki no longer has sensibility in his burnt scars, or has very little, not enough to feel anything but slight touches. This is usually brought up in slash fics between him and Midoriya.
* ''Manga/DeathNote''
** Similar to [[VideoGame/MetalGearSolid Decoy Octopus]], Matt from ''Manga/DeathNote'' received almost no characterization in canon apart from that he loved video games, chain-smoked, and that he was extremely [[DeadpanSnarker snarky]] and pretty [[BrilliantButLazy lazy]] and [[TrashOfTheTitans messy]]; despite this, he is almost universally portrayed in fanworks as the OnlySaneMan to L, Near and Mello.
** Depending on the writer Mello might be German, Russian, Prussian, or Slovenian and he almost always was born with ties to the mafia.
** Most fanfic has Matt calling Mello "Mells", while Mello calls him "Matty". [[SlashFic I think you can guess what kind of fanfic this originated in]]...
** Not to mention Matt's hair. He's never shown in any color pages of the original manga, so a hair color was never defined for him. Fanon decided his hair was a lovely maroon color or cherry red depending on what you like. When the anime came along, he was given a hair color of brown with natural highlights somewhere between navy and dark green, depending on the lighting. Guess which hair color he is still usually drawn with. Also, the fandom decided his eyes were any one of several shades of green. His canon eye color is a deep blue...but the green eyes are as entrenched in the fandom as the red hair.
*** Which miiight be because pretty much everyone else's hair is a normal color... Misa, as a pop star, probably dyed hers, and Light's could be bleached. Not that brown isn't a normal color...
** Also, at the end of ''Manga/DeathNote: Relight'', we see a {{Shinigami}} that is [[GogglesDoNothing wearing goggles]] and torn up school clothes, during the scene where [[spoiler:Ryuk looks at Light's name in his Death Note]]. People assume that [[spoiler:the Shinigami is Light himself after dying. It was stated in the series that Light was more devious than a Shinigami by Rem, so people think Light got reincarnated because of how he used the Death Note]].
*** This fanon has also sparked the overall idea that {{Shinigami}} used to be normal humans and that any human who uses a Death Note will become a {{Shinigami}} themselves after they die.
** The vast majority of fanfics involving Near say that he's albino despite this never being officially confirmed.
** Many fics also have Near and/or L described as having Asperger's Syndrome, which is also never confirmed.
** Beyond Birthday of ''Manga/DeathNote'': ''LightNovel/AnotherNote'' always calls L "Lawli" in fic as a TermsOfEndangerment. Sometimes, they are depicted as twins, or as ex-lovers ([[BreadEggsBreadedEggs and sometimes]] [[{{Twincest}} both]]); we don't know precisely ''what'' their mysterious shared past involved.
** Beyond Birthday being "born with the Shinigami eyes" is often explained that he is either a Shinigami cursed into human form, [[HalfHumanHybrid part-Shinigami]], some kind of Death Note owner who just prefers to kill with knives, or the son of female Death Note owner who made the eye deal.
** He is also frequently depicted as a cannibal and/or a rapist, despite there being no indications of him consuming blood and/or flesh from ''any'' of his victims in the novel. As for the part about being a rapist, he didn't rape any of them, either; the closest we get to that is his description of himself as an "[[BastardBoyfriend aggressive]] [[{{Seme}} top]]." (Which, yes, ''could'' mean that he's a rapist, but it could also mean that he's just into some really kinky stuff or rough sex, or that he's a player.) He never really explains what he meant by that.
** [[WordOfDante The author]] of ''FanFic/ZeroVsKira'' did the math and gives a conservative estimate that if Light did nothing but write names (taking a ten minute break to rest his hand) [[PersonOfMassDestruction Kira's kill-rate would be around 1,000 dead per hour.]]
** In many fics, Mello is said to be a practicing Catholic, because he is (particularly in the manga) seen with Catholic paraphernalia in his home and wears a rosary necklace, and also the aforementioned note on his (possible) heritage.(Notably, although Misa owns some Catholic paraphernalia, she is generally thought to just have it because it looks cool.) It certainly also would be [[AgainstMyReligion a plausible motivation to fight against Kira and his regime]], beyond merely besting Near (who he [[spoiler: technically ''gave'' the role of L's successor to in the series.]] Also, Mello refers to [[{{God}} The Almighty]] in his introduction to ''LightNovel/AnotherNote''.
** In almost every fanfic where the topic of Mello's burn scar comes up, the one who treated the burns was Matt, who almost invariably has no medical knowledge, or only some ''very'' basic medical knowledge. In the series, we don't know ''who'' did, only that the doctors (legitimate and [[BackAlleyDoctor otherwise]]) that Kira et. al. talked to did not recognize anyone resembling Linda's drawing of Mello. It would have been ''very'' difficult (though not necessarily impossible) for a non-medical person like Matt to treat burns that severe [[note]] Or, indeed, for an actual medical professional ''outside'' of a hospital or clinic setting [[/note]], and not have them get infected or anything.
** The general consensus among the fandom is that Mello left Wammy's on his own, and Matt did not join up with him until after the explosion. However, it's just as possible that they left together. Or that they ''were'' separated, but not for the entire 5-year TimeSkip. (Maybe only a few weeks or months.) It is also generally believed that they did not have any contact until Mello got burned and called Matt for help, but it's just as possible that they actually ''did'' have contact of some kind. (In fact, it would make more sense if they did have contact, since Matt is willing to give Mello the time of day and treat his wounds, but it means less {{Angst}} and drama, and [[TrueArtIsAngsty we can't have that, now can we?]]) Also, it isn't known for certain whether they actually ''were'' friends (or more) at Wammy's, or if the friendship came later, though the general consensus is that they were very close while there.
*** Another popular fan theory is that Matt wears long sleeves and gloves to hide evidence of SelfHarm and/or [[DrugsAreBad needle-drug use]] brought on by being separated from Mello. Although he had the sleeves and gloves while ''both'' he and Mello were back at Wammy's, as evidenced in Near's flashback in the manga to the Q&A session with L. [[OccamsRazor The simple (albeit boring) explanation for Matt's choice of attire is most likely just that he likes them.]]
** [[IdenticalTwinIDTag To distinguish Beyond Birthday from L]], BB is often depicted with a black shirt (with or without blood splatters), or a white shirt [[BloodIsTheNewBlack splattered in blood]]. In actuality, he dressed exactly the same as L, and is ''way'' too clean (and too smart) to run around in bloodstained clothes.
* Manga/AttackOnTitan has a grand JigsawPuzzlePlot involving the nature of the last human stronghold on earth, a country-sized landmass surrounded by fifty-foot walls meant to keep the man-eating giants outside and the humans safe inside, only for everything to go horribly wrong when a titan tall enough to kick in the outermost door appears. As expected, several conspiracies are gradually being unveiled, [[spoiler: groups of humans capable of turning into titans amongst them]], but over thirty chapters in and the readers are still lacking in definitive answers. The manga goes as far as to hide major plot points in easter eggs for promotional materials at times, and chooses to drop subtle hints about things rather than solidly confirming facts unless necessary or the sort of thing that the readers can't figure out based on subtle hints. Naturally, a lot of Fanon is the result. As such, the WMG tab contains an entire section for things that are known for sure, and things that the readers are pretty sure about but are not yet definitively confirmed.
* ''Manga/FullmetalAlchemist'':
** The idea that Amestris tricked the Ishvalans into attacking them, so that Amestris could invade and conquer them. Actually Ishval was just an area of Amestris that the government tricked into rebelling so that they could crush and massacre them. This is made clear in the manga when several scenes from the Ishval Massacre contradict this such as the fact that the Amestrian army still had Ishvalan soldiers up until the 7th year of the rebellion, they only killed the pure blood Ishvalans (and possibly the half blood Ishvalans) when they needed souls for a Philosopher's stone. Scar's brother also tells Scar that Amestris allows the Ishvalans to worship Ishvala. In addition, the Amestrian government is currently at war with 4 other nations, and is a military dictatorship, like they would need a BatmanGambit just to invade a 5th.
** Also it is generally accepted that Edward's pants are leather, despite the fact that they would be, as Vic Mignogna points out, [[http://www.youtube.com/watch?v=NXU5zhF3-HA "hard to fight in. Ed's gotta be smarter than that."]] Conversely, as Vic does not write or draw for the series, it is hard to determine the exact material of Ed's pants unless Arakawa-sensei decides to enlighten us for herself.
** There was a generally accepted theory that Roy Mustang, because of his more East Asian looks and the fact that he was adopted, was an orphan from Xing. However, this theory has been altered slightly with the reveal that [[spoiler:Madame Christmas is not only Roy's adoptive mother but also his paternal aunt]]. More fans now lean toward the idea that he is of ''partial'' Xingese ancestry.
** In fanfics depicting an adult Elicia, she will inevitably follow Hughes' footsteps and join the military.
** In the [[Anime/FullmetalAlchemist 2003-verse]], some of the most common names for [[spoiler:our-world Winry and Riza]] are "Wendy" and "Elizabeth".
** [[spoiler:Envy's]] original name is always "William [[spoiler:Elric]]" in fanfics. A lot of fans think it's official but it isn't.
** It's never stated how many soldiers raped [[spoiler:Rose]] but fans insist it was more than one, often a gang-rape.
** DeadGuyJunior is very common in fanworks. Rose's son is usually named after Edward. If Edward [[spoiler:stays on our side of the Gate]] his son will often be named "Roy" and his daughter either "Trisha" or "Winry" (the name "Trisha" is also often used for the manga with his and [[spoiler:Winry's]] daughter).
** The alter counterparts to Sheska and to a lesser extent Winry are often depicted as Jewish in post-[[Anime/FullmetalAlchemistTheConquerorOfShamballa COS]] fanfics.
** It's unlikely in canon but several fans depict Alfons and [[spoiler:alter!Ed]] as siblings.
** There is a prevalent piece of fanon which states that Roy, when [[SmartPeoplePlayChess playing chess]], will go to great lengths to avoid losing his queen piece, as that's the piece associated with [[SubordinateExcuse Riza]] in the canon.
* There are several of these orbiting ''Anime/NeonGenesisEvangelion,'' including Misato's hair color and driving style (though that's probably more NeverLiveItDown), the name of Touji's IllGirl little sister, the personalities of Hikari's sisters, Shinji being a skilled chef and even some things that directly contradict canon -- like claims that Rei is emotionless, or that Shinji's wardrobe consists entirely of school uniforms, ignoring several occurrences of him in other outfits (excluding the dance outfit and plugsuits).
** The notion that Misato killed Kaji remains popular despite an [[WordOfGod explicit statement from the show's creator]] to the contrary. The idea that Naoko Akagi's soul resides in Unit 00 also persists despite it not making any sense whatsoever.
** Kaji ''never'' cheated on Misato. It's revealed in episode 15 that Misato pretended to have another boyfriend to break up with Kaji because she was scared of how much Kaji reminded her of her father. The idea of Kaji cheating seems to be popular because it helps clear the way to pair Shinji with Misato or to just make Kaji look worse.
** The fanon name for Touji's little sister, "Mari", now has an uncertain future with a new pilot character in the ''Rebuild'' Evangelion movie series [[OneSteveLimit being named Mari]].
*** In the second ''Rebuild'' movie, she is briefly shown leaving the hospital with Touji, whereas in the original series she never leaves and is only mentioned.
*** In fact, by the third ''Rebuild'' movie, Touji's sister becomes a significant character, and is shown as a young adult named ''Sakura'', which also happened to be the second most common fanon name for Touji's sister.
** Also, Shinji being a skilled chef actually made it into canon in the second ''Rebuild'' movie.
* The [[BigScrewedUpFamily Zabi family]] from ''Anime/MobileSuitGundam'' are a veritable fanon magnet, as they get very little characterization in the series proper. Popular theories include:
** Degwin being of Italian descent and making his fortune mining raw materials for the space colonies on the Moon (though it is canon that Degwin lived on the Moon before Side 3 (the future Zeon) was completed);
** Gihren's estranged wife being a member of Danish royalty (though the thing about him cheating on her with his assistant Cecilia is canon, at least according to the novel) and being fond of cats;
** Saslo (the guy who was blown up with a carbomb by Ramba Ral's dad a few years before the series takes place) being homosexual;
** Dozle's love of sports & dogs;
** Kycilia having a sexual relationship with Char sometime in the past (though she does have some kind of relationship with his lookalike Johnny Ridden in at least one {{Gaiden}} manga);
** Garma's various health problems, drug use, musical talent & his mother dying in childbirth ([[AllThereInTheManual canon sources]] mention her dying shortly after he was born, but never specify how).
** Another very common fanon theory is the illness MadScientist Ginius Sakhalin from ''08th MS Team'' suffers from is [[http://en.wikipedia.org/wiki/Hepatolenticular_degeneration Wilson's Disease]]. Though its name is never mentioned, the symptoms do seem to fit.
** ''Anime/MobileSuitGundamWing'' has The Great Trowa Barton Rape Debate, where some fans try to explain Trowa's {{Stoic}} nature by saying that the mercenary group who took him in in the prequel manga ''Episode Zero'' also used him [[SituationalSexuality to vent their pent-up "frustrations"]]. The manga doesn't really hint at this at all; in fact, Trowa was shown to be emotionally stunted ''before'' he met the mercs, since [[WildChild he spent the first few years of his life without human contact]].
** ''Anime/MobileSuitZetaGundam'' has fans speculating that Paptimus has hypnotic powers over women to explain how he convinced [[spoiler: Reccoa to not only switch sides but be willing to take part in genocide]]. While it's far less misogynistic than what Paptimus suggests (that being that [[spoiler: Reccoa was just tired of not being seen as a woman by Char]]) it's never stated or even really hinted at.
** A very popular interpretation from ''Anime/MobileSuitGundamZZ'' is that [[spoiler: Glemmy wasn't Gihren's clone like he claimed to be, but his ''[[BastardBastard illegitimate son]]'']], and [[spoiler: the clone thing]] was just a cover story to help deal with his traumatic life.
* Due to its many disparate continuities, ''Franchise/{{Zoids}}'' has a fair bit of fanon.
** Bit Cloud and Vega Obscura from ''New Century'' are descended from Van Flyheight and Joyce "Raven" Chen from ''Chaotic Century/Guardian Force'' respectively.
*** In fact, just about any NC character is claimed to be descended from any ''CC/GF'' character. Given that there is a thousand years between the series, this is possible.
** Similarly, it is believed that the "Organoid Systems" inside the Liger Zero and Beserk Fury (stated in canon to simply be self-sufficient artificial intelligence programs) are literal organoids; more to the point, they are generally believed to be Zeke and Shadow, respectively. Often tied into this theory is the idea that the Liger Zero and Berserk Fury evolved from Van's Blade Liger and Raven's Geno Breaker.
*** Likewise, it has often been claimed that Leon's red Blade Liger was created by the Organoid Ambient
** Lieutenant/Captain O'Connell from the ''Chaotic Century'' and ''Guardian Force'' has no given first name, but a slash fanficcer dubbed him Jake and now many fans believe that to be his official name.
** Any attempt to explain Hiltz' IdiotPlot master plan from ''Guardian Force'' will inevitably involve fanon speculation, given both the nonsense plan and Hiltz' acute lack of personality.
* Half of the ''Anime/CodeGeass'' fandom believes that Lelouch became the now-immortal Code-and-Geass-wielding RR (Japanese R = L) who lives happily ever with CC ala Spice and Wolf's Lawrence and Horo (Lelouch and Lawrence do have the same seiyuu after all), as allegedly shown in the "Cart-End" final episode. This mainly due to the fact during and after Lelouch's attack, C.C.'s mark is always covered by her hair, and thus unknown if it is gone or not.
** As it turns out in the [[http://www.youtube.com/watch?v=MC9NEzvvbsQ CodeGeass picture drama]] set after the end of R2 [[spoiler: he's dead]].
** Fans also love to justify Kallen's SpellMyNameWithAnS by claiming she goes by "Karen" some of the time, usually using one name in public and one when she's doing Black Knight stuff.
** The origin of Lelouch and Nunnally's false surname, Lamperouge; more often than not, it's believed to be their mother Marianne's maiden name, but there's been precious little information about Marianne before she married Emperor Charles[[note]]There was a short LightNovel detailing an attempted coup in the 1990s, but it only ever refers to Marianne by her first name[[/note]].
** It's also common among fans to assume that Marianne has french ancestry.
** Many fans assume that Milly Asford was more aware of events going on then shown. They generally suggest that she was at least aware that Lelouch was Zero, or suspect he was connected to him somehow, due to knowing him for so long.
** Due to material from the Light Novels, his appearance (and death) at Narita, and the presence of Code R in the same location, many fans believe Joseph Fenette was connected to Code R. Shirley is rarely, if ever, told this.....[[BreakTheCutie for her own good]].
* In the ''Anime/HaibaneRenmei'' fandom, ''[[http://cff.ssw.net/forum/viewtopic.php?t=1025 Mado of Stone Mill]]'' fills in many side-plots that make Glie seem all the more multifaceted and interesting, and is so well-written in OriginalFlavor that many people consider it up there with the canon.
* Even fluff anime isn't immune. ''Manga/AzumangaDaioh'' has all sorts, ranging from ungiven names (surname for Kaori, given name for Sakaki and Kagura, and background extras such as Rachel Handlebars) up to unrequited crushes (remember, only ''one'' is actually shown). Add generous desire for LesYay and stir:
** Two of the fanon names are Kaori '''Aida''' and Chihiro '''Inoue'''. This is based off a panel of the manga, where characters we see the back of the heads of are called these surnames and the backs of their heads ''kinda'' look like Kaori's and Chihiro's. Sakaki or Kagura don't have any commonly agreed-upon names, though.
** A very common belief is that Osaka has forgotten her real name is Ayumu Kasuga. This was never actually seen in either manga or anime, instead being taken from the ''Tsunami Channel'' webcomic. In fact, Osaka was very distraught that she had apparently been kicked out of Miss Yukari's homeroom, as she couldn't find her name on the classroom chart. Turns out, she was looking for her ''birth'' name, not ''Osaka,'' as she was listed down as.
** Another common one is the Nyamo/Yukari pairing. Or, rather, that there WAS one. This appears to have most basis in the fact that [[HeterosexualLifePartners they are still single]] and that Nyamo still puts up with [[{{Jerkass}} Yukari]]. Quite a bit of fanon also revolves around the content of the [[NoodleIncident "love letter" and Nyamo's drunken lecture in episode 14,]] mostly dealing with the aforementioned relationship. See the WMG page and the Headscratchers page for more information.
* ''Franchise/YuGiOh'' has a ''very'' vast fanon. The biggest one is the usage of the terms "yami" and "hikari". They refer to the three characters who share their bodies with other beings. Mutou Yuugi is the hikari, the Pharaoh is the yami. Bakura Ryou is the hikari, the spirit of the Ring is the yami. Malik Ishtar is the hikari, his dangerous separate personality is the yami.
** Another one is the name of the spirit in the Ring. His form in Ancient Egypt is never given a name besides "Bakura", but somehow, people have christened him, "Afekia". This misnomer is easily explainable, as it appears to have come from a fan who misheard one of Bakura's lines in the English dub (when Yami asks who 'Bakura' really is in episode 79 of the Duel Monsters arc, and he replies "I am a thief, and a stealer of souls.") and took it as "I am 'Akefia', stealer of souls." But to many other ''Franchise/YuGiOh'' fanfiction writers, Akefia just sounds awesome and Eygptian-y.
** Also, for fanfics in the past, many people tend to turn Yuugi into a character in Ancient Egypt, then give him the name "Heba" or "Haba", which is apparently Arabic for "game".
** The relationship between the spirit of the Ring and his host body, Bakura Ryou (in fanon the spirit takes the name Bakura or Yami Bakura and the host takes the name Ryou), is grossly exaggerated in many ways, the most prominent of which is the spirit being heavily abusive and Bakura being weak and frightful of him. First off, Bakura is hardly even aware of the fact that the spirit is there, considering him as more of a voice in his head. Secondly, the spirit can't form his own solid body, so if he were to abuse Bakura, he would have to damage his own host body, which doesn't serve him in any way, so he'd never do it.
*** The spirit ''does'' injure Bakura's body in the manga, but only to stop Bakura from interfering with the spirit's attempt to gain the Millennium Puzzle.
** In the fandom, Jonouchi and Shizuka's father will always be portrayed as abusive. This is hinted at in the manga, but never confirmed. [[note]]To be fair, he ''does'' [[GrievousBottleyHarm throw a beer bottle at Yugi, Honda, and Anzu]] while mistaking them for Jonouchi after they arrive at his house in one chapter of the manga, so it's rather hard to interpret the man as not abusive.[[/note]]
* Like ''Manga/{{Naruto}}'' and the Kyuubi, Kurama from ''Manga/YuYuHakusho'' is believed to be in constant telepathic communication with "Youko", his demon self. Futhermore, "Youko" is very bored with being stuck inside a 15-year-old virgin and would very much like it to be sexy tiems nao. This one you can blame on the dub: the very first time Kurama transforms back, Youko Kurama's voice tells him "it's up to you now", and calls him Suichi, his dub human name; he answers back in his normal voice. In the Japanese version, Youko Kurama's voice begins the line, and normal-Kurama's voice finishes it as he transforms, implying one consciousness. Also, "Jaganshi" and "Youko" are thought to be Hiei and Kurama's names -- they're technically titles, referring to what type of {{youkai}} they are, and the word "Jaganshi" ("Evil Eye Master") is only used in one episode title.
* ''Manga/InuYasha''
** Sesshoumaru is believed to have inherited the title "Lord of the Western Lands", complete with lands, armies, servants and castles. In {{canon}}, no such inheritance exists. Sesshoumaru is a rootless wanderer with a single servant who never met his father, and Inuyasha lives in a human peasant village with his father's only confirmed servant, Myouga. The fanon comes from a single, vague reference to the father, when alive, being a {{youkai}} "who prowled the west". Sesshoumaru's mother does live in a palace that travels through the sky, but even Sesshoumaru is only an occasional visitor who struggles to locate it, and she was introduced years after the fanon became established.
** Another popular belief is that youkai "mark" their mates with some sort of bite on the neck or breastbone and that they go through animal-based mating seasons (and yes it's almost always the ''[[CriticalResearchFailure male]]'' [[CriticalResearchFailure dog or wolf youkai that "go into heat"]]).
** Mostly prevalent in AlternateUniverse stories, youkai have access to enchanted charms (almost always rings) that cause them to appear human when worn, thereby explaining why in the canon Kagome almost never meets any youkai in the present era.
** Jaken is universally believed to be serving Sesshoumaru as a result of a life-debt he owes him. The source of this belief comes from a random stand-alone {{filler}} episode the {{anime}} did that attempted to pad out Jaken's background. The original manga doesn't explore Jaken's background at all and never explains why he serves Sesshoumaru.
** Inuyasha's parents are never named in the anime or manga, but the third movie specifically names his mother "Izayoi," and this is almost universally accepted. His father is often called "Inutaisho," a corruption of "inu-no-taisho" which is his title, not his name, and translates roughly as "The Dog General." Less accepted but still present is the idea that his father is named "Toga." This comes from the third movie too and was a name that the production team gave to him just for the sake of referring to him by name while the movie was being made. In the finished film he's never addressed by name.
** Inuyasha is popularly cited as being 200 years old. This comes from the third film adaptation and not from the original manga.
* In the ''Manga/{{Guyver}}'' fandom, it's generally accepted that Edward Caerleon, late of the [[TheOmniscientCouncilOfVagueness Zoalord Council]], is Welsh.
* As several details in the ''Anime/MagicalGirlLyricalNanoha'' franchise can only be found in [[AllThereInTheManual supplementary materials]] like the [[AudioAdaptation Sound Stages]] and [[ComicBookAdaptation manga]] which the english speaking fanbase wasn't aware of for sometime, western fans took some 'facts' as a matter of course, such as Nanoha copying Fate's Bind spell (she didn't, Yuuno taught her how to do a Bind in the very first Sound Stage, which took place between Episodes 2 and 3) and Reinforce Zwei being the [[SleepModeSize weakened form of the first Reinforce]] (she's not, she's a completely new Unison Device Hayate designed with the help of Mariel and Yuuno as mentioned in the last Sound Stage of ''A's''). Most of these have died down ever since English-speaking fans learned about the supplementary materials and [[FanTranslation began translating them]].
** Also, Nanoha and Fate are generally considered to be romantically involved. While they are HeterosexualLifePartners with a lot of LesYay, it's never made canon. Which can lead to some confusion when people go into the series having heard them described as "girlfriends".
*** There's also that bit where Vivio considers both Nanoha and Fate her mothers muddying the waters.
*** On the other hand, they're never actually confirmed ''not'' to be a couple, either. Their relationship is [[HideYourLesbians just ambiguous enough]] that they could either be lovers or very close friends.
*** For that matter, despite what people may claim, none of the other possible pairings are ever actually confirmed either. Some of the characters have expressed interest, but none of them ever get a RelationshipUpgrade, except for Chrono and Amy (which happened off-screen).
** There are a few other persistent bits of fanon, such as the belief that Graham gave Hayate the Book of Darkness (on the basis that he said that if someone like her, with no friends or family, were sealed away with it, no one would have to mourn her), which is not true. The Book transported itself to Hayate, and Graham tracked it down.
** Also, a lot of people seem to think that Subaru and Ginga were created by Scaglietti. They weren't. It was done partly using his research, but Scaglietti was not directly involved.
** And then there's the theory that the Wolkenritter were originally humans (or in Zafira's case, a familiar/guardian beast) who were absorbed by the Book of Darkness. Nothing of the sort has ever been stated in canon.
*** An extension to this is that Agito was originally created to be Signum's Unison Device.
** Another misconception about the Wolkenritter is that they had all their memories erased every time the Book of Darkness chose a new master. This is directly contradicted in the show, as they make references to how Hayate is different from their previous masters. It is stated that they lost some of their memories; but that only refers to their memories of the Book of Darkness going rampant. They also do not remember anything from before it became corrupted. Their memories of the intervals in between, however, are intact. This is stated outright [[AllThereInTheManual in the commentary to the second movie.]]
** Vivio often calls Hayate, a close friend of both of her mothers, "[[HonoraryUncle Aunt Hayate]]" in fan fiction. So far, in canon, she hasn't called her anything other than "Commander [[LastNameBasis Yagami]]", just like Hayate's subordinates, and even Nanoha and Fate themselves do while on duty.
** There are a number of misconceptions about how [[RankInflation mage rank]] works. It is ''not'' simply a measurement of magical strength; as seen when Subaru and Teana take the exam for advancement, going up a rank involves passing what is essentially an obstacle course requiring the use of tactics, so a WeakButSkilled mage can still qualify for a fairly high rank. However, Hayate's SS rank ''does'' denote her raw power, because she has a "Synthesis" rank, not a combat ranking like what most of the other characters have.
** Another misconception is that Hayate had no linker core before Reinforce merged with her. This is patently untrue, as Signum flat out says that the reason the Book harmed Hayate was because her linker core wasn't fully mature, and it's actually shown on screen for a couple seconds.
** It's commonly accepted that Graham is responsible for Lindy's habit of [[FeeFiFauxPas drinking her Japanese green tea British-style]].
* ''LightNovel/HaruhiSuzumiya'':
** Fans of the anime tend too easily to accept Koizumi's theory that [[spoiler:Haruhi is God]]. Koizumi himself doesn't present it as certain fact; he labels it as a theory and a "worst case scenario" that his Organization is acting on.
** Ironically Koizumi is the one source we ''know'' is unreliable. The acceptance of his version comes from the alternatives being {{Technobabble}} and the other so heavily redacted as to be meaningless.
** Also often accepted as true is the idea of Koizumi being gay, despite the fact that this has never been confirmed in canon. In fact, there is some evidence that contradicts it.
*** In one of the novels, Koizumi says that he only acts the way he does because Haruhi expects it and would ''make'' him that way if he didn't, which fans have interpreted as referring to the HoYay between him and Kyon, but it's more probable that he was talking about his YesMan behavior towards Haruhi.
** Another example is the Fanon {{OTP}} of Kyon and Haruhi. This is likely due to three factors. 1. The rather popular anime is missing a lot of narration that counters the Kyon/Haruhi pairing, 2. The first novel and some of the second tend to focus on that pairing, but we haven't received the later novels here in America, which tend to not, and 3. Since the first novel is ''very'' Kyon/Haruhi oriented, much of the evidence in the later novels contrary to this pairing tends to be {{hand wave}}d or used as confirmation bias. It's rather shocking how insistent people are that ''this'' is the official couple.
*** It should be mentioned that this is no mere [[ShippingTropes ship]]. Many Kyon/X and Haruhi/X fans tend to claim that Kyon/Haruhi is actually the official couple.
** Many fans are also convinced that Mikuru is actually a manipulative girl sent to the past specifically to appeal to Kyon. This is never confirmed in any way (or even mentioned after Koizumi throws the idea out there) and in fact what little character development Mikuru has gotten so far seems to suggest that she is actually not very confident in her abilities.
*** Well, that's true of the present Mikuru. Future Mikuru, on the other hand, is a bit manipulative.
** Although not universally accepted, a popular fan theory is that Kyon is the real [[spoiler:RealityWarper]], not Haruhi. This is supported by many things, including the statements in the first episode/first chapter that he was once as eager to find supernatural beings as Haruhi.
* ''Manga/{{Bleach}}'':
** The fandom splits the Arrancar Arc into five arcs: the "Arrancar Invasion Arc", "Hueco Mundo Arc", "Turn Back the Pendulum Arc", "Fake Karakura Town Arc" and "Deicide Arc", even organising its TVTropes entries accordingly. This is despite WordOfGod calling it a single, long Arrancar Arc in interviews. The manga itself backs up the interviews; the beginning of the Arrancar Arc (Chapter 182) is given a rare subtitle, called "Trigger for a New Concerto" to kick it off, and Volume 48 confirms at the end of Chapter 423 that the Arrancar Arc has ended and that the next volume will kick off a new arc, the Lost Agent Arc. The Arrancar Arc is therefore a single continuous arc spanning Chapters 182-423 (Volumes 21-48) and not five separate arcs as the fandom tends to think.
** There is a wide-spread belief that Ukitake's eyes are green in the manga and that his eyes being brown in the anime is a case of AdaptationDyeJob. In fact, the anime is right. His eyes are brown in the manga, as shown in Chapter 116 and at least two [[AllThereInTheManual supplemental databooks]]. The reason fans think his eyes are green in the manga is because of a special colour picture in Chapter 335 which had a "green on white" theme. Kubo changed Ukitake's eyes to green for that picture to match the theme and fans have believed his eyes are green ever since.
** A lot of the fandom is convinced that Byakuya's power is pink when released with the exception of his final technique which is white. In fact, this belief stems from the anime where Byakuya's power in shikai and bankai are coloured pink with the exception of his final bankai technique. In the manga, however, his power is white in all forms, as revealed in the colour chapters of his fight with Ichigo (which also reveals Ichigo's reiatsu is, in fact, yellow in the manga).
** It is almost universally accepted that Ichigo's father Isshin is or was a member of the shinigami [[PraetorianGuard Royal Guard]]. [[spoiler:The manga eventually reveals he was the Tenth Division captain and introduces the five Royal Guard members. That should have killed this belief, but the theory continues to exist that he could have been the Tenth Division captain and now is secretly Royal Guard.]]
** There's a wide-spread view that the manga has proven that Orihime is a Fullbringer because Fullbring is activated on a physical object with a mystical light and Orihime's powers also activate via a physical object with a mystical light. Not only are many different kinds of powers activated with a light of some kind, including certain non-Fullbring human powers, but the manga doesn't make any conscious attempt to connect Orihime's abilities to Fullbring. This is in contrast to Chad who has been explicitly associated with Fullbring by the manga. That making a connection between Orihime and Fullbring is an example of {{fanon}} and not {{canon}} seems to have escaped much of the fandom's notice.
** The Hogyoku is often believed to be able to make any wish come true. Aizen explicitly stated, however, that the Hougyoku is only capable of affecting desires ''that are possible to achieve without it''.
** Large parts of the fandom believe Aizen is immortal because he has the Hougyoku inside him. However, the manga didn't actually claim that. The person who knew the most, Urahara, says Aizen is "almost impossible" to kill but never claims he's completely impossible to kill. It's the panicky, judgemental Central 46 who interpret Aizen's state as "immortal". However, Urahara's words suggest that interpretation is inaccurate, something a large part of the fandom tend to ignore.
** Arrancars' holes are...sensitive around the edges, at least according to fans.
** There's a persistent belief within the fandom that a person loses their memories when they move on to the afterlife, reinforced by the first movie which claims the same thing. However, the canon does not support this belief. When Ichigo's group first arrives in Soul Society, they meet Shibata whose soul they saved when he was trapped in the cockatiel. He completely remembers everything that happened while he was alive, and while he was being protected by Sado. Shibata's adopted brother has been in Soul Society much longer and remembers exactly when and where he died (1947). Hisana and Rukia died together in the World of the Living and Hisana never, ever forgot they were sisters. Renji once comments that the driving goal of all people who die and come to Soul Society is to search through Soul Society to try and find the blood relatives they had in life. When Mayuri talks about all the dead Quincies he experimented on, it's clear they all have memories from when they were alive and their beliefs remain intact; certainly Souken's memories never faded after his death, as Mayuri uses them to taunt Uryuu.
* ''Franchise/{{Digimon}}'''s CanonImmigrant Ryo Akiyama's Wonderswan games were never released in English and only one saw a fan translation. However, one fan extrapolated from his and Ken Ichijouji's friendship in the games that Ryo also knew Ken's older brother. Over the years this extrapolation and its getting picked up by other fans has quietly snowballed into the odd ''Anime/DigimonAdventure02'' fan with an interest in pre-series Ken believing the three of them are friends is canon.
** Also the name "Masaharu" was used by fans for Yamato and Takeru's father for a long while. Later on, it was revealed that his real name is "Hiroaki", which is an example of TheDanza. A lot of people still like "Masaharu" better.
** In ''Anime/DigimonTamers'', the young pair of twins, Ai and Mako, were never given a last name in the series. Several fanfictions tend to give them the name "Terada."
*** That they're twins at all is also fanon. Ai and Mako aren't actually the same age.
** Related to the Ryo example above, it is generally believed by many that Ryo's nemesis (and actual digimon partner, but that's a long story) is the GreaterScopeVillain of the entire ''Anime/DigimonAdventure'' universe, and that he is responsible for unleashing Apocalymon and setting the events of the series in motion. There's just one problem with that: this is '''never actually stated''' in the games in which Millenniumon appears. Millenniumon is responsible for a lot of bad things that happened, but he's far from the "puppet master" he's believed to be by a large percentage of the fanbase - including some on this very wiki.
*** Continuing the Ryo thing, that he supposedly has the powers to access other universes and timelines under his power, due to holding the status of "Legendary Tamer". While it has occurred in the games proper, it's mainly been due to outside influence, like Moon=Millenniumon deciding to blow both of them to Kingdom Come, or ENIAC opening portals for him.
** The quadrants; officially, they refer to different regions of the DW, with each parallel Digiworld having its own four. A section of the fandom regard Adventure's entire DW as being in the Eastern Quadrant and the Tamers one in the Southern.
** An infrequently-cited theory is that Gatomon's Mega form hinges of the absence (Magnadramon) or presence (Ophanimon) of her [[AmplifierArtifact Holy/tail ring]]. Officially it's jossed, as various media depict Gatomon with said object evolving into Magnadramon.
* Francine is one of the few main characters in the English dub of ''Anime/SamuraiPizzaCats'' who is not explicitly given a surname. Daniel Kary, webmaster of one of the [[BigNameFan better-known]] SPC fan sites, began referring to her as "Francine Manx" sometime in the 1990s, apparently on a whim; the name stuck, and now appears on virtually every web site associated with the series, including the Internet Movie Database.
* Thanks to an EyeCatch from the third season of ''{{LightNovel/Slayers}}'', just about every fanfic writer believes that Luna Inverse and The Beast Master, one of the five Dark Lords under Ruby Eyed Shabranigdo, are best friends. This seems to stem mostly from a mixture of the manga (which revealed that the werewolf/troll crossbreed Dilgear did, indeed, heal from his fatal wounds and ended up becoming Luna's pet) not being very available and Luna's willingness to [[GoodIsNotNice pass off saving the world and claim she was too busy being a part-time waitress]], instead insisting that they approach her... [[ChaoticNeutral "unpredictable"]] little sister instead. This is despite Luna being known to carry the soul of the chief ''god'' of their world within her, essentially making her a Paladin of such power she can kill a dragon with a kitchen knife and a natural enemy to all Mazoku.
* In the ''Manga/KatekyoHitmanReborn'' fandom, everyone seems to think that Reborn and the other Arcobaleno will age and deage as time passes by. This probably stemmed from Lal Mirch who, after ten years, had become an adult once again. But that only happened because she possessed a corrupted pacifier and isn't really an Arcobaleno since Colonnello took her place. There is no real evidence that the other Arcobaleno will age and de-age over time.
** This may have also stemmed form Luce, Aria, and Uni who looked incredibly alike. They were thought to be the same person (Luce) but it was eventually revealed that Luce is Aria's mother and Uni's grandmother.
** Also, the--now-confirmed--theory that Reborn was actually a full-grown man in the form of a baby was generally accepted by many fans as being true.
* ''Manga/MahouSenseiNegima'' has several bits of Fanon. One piece that eventually was confirmed as canon is the idea that Asuna is BookDumb because a LaserGuidedAmnesia spell that was used on her in the past interferes with her ability to learn.
* It's a commonly known fact that the protagonists of ''VisualNovel/{{Tsukihime}}'' and ''LightNovel/KaraNoKyoukai'', Tohno Shiki and Ryougi Shiki respectively, both of whom can see the "predetermined death of all things" can only see the deaths of those with a "Gaian concept of death". Except this isn't fact; it's a theory created by English-speaking fans based off something written in the side materials: Specifically, that neither of the Shikis can kill ORT, the Ultimate One from the planet Mercury (otherwise known as TYPE-MERCURY). The reason that neither of the Shikis can kill ORT is because it literally does not have a "death", at least not one that either of the Shikis can recognize. According to Word of God, TYPES like ORT cannot be killed, even if you eliminate their physical bodies, as they don't have a concept of life or death to begin with. Fandom has run away with this, claiming that the reason neither of the Shikis can kill ORT is because it is not from Earth.
** It seems more like Ultimate Ones [[YouCannotGraspTheTrueForm exist in a manner humans are incapable of understanding]], which is why the Mystic Eyes of Death Perception don't work; you can't perceive their death if their death is by nature impossible for humans to perceive. Of course, this suggests that ''any'' being with a concept of death that humans can't understand would be immune to the Mystic Eyes of Death Perception.
** Loosely related to this is the "fact" that neither Shikis are capable of killing Servants, mainly for the same reasons. Because they are "already dead", they cannot be killed again. Much of this is also based off of Word of God; according to the creator Nasu Kinoko, neither Shikis would be a match against Servants. However, Nasu has explicitly failed to comment specifically on whether the Shikis would actually be able to KILL Servants, resulting in massive migraine-inducing power-level arguments.
* On a great many fansites for Manga/ElfenLied, Silpelit Number 3, who infected Kurama causing him to sire Mariko as a Diclonius, is supposed to be the older sister of Nana. I personally have scoured the manga and the anime up and down, and can say there is no evidence for this. It appears to be a mistake one person made that was then lifted literally verbatim on each successive site.
* ''Manga/FushigiYuugi'' has a couple of typical Fanon elements that came up much more often in the high days of the fandom, but persist in the fanfic that still exists, despite most of it being Jossed by the addition of ''Genbu Kaiden'' and the novels published after the anime ended.
** Ashitare (if he's not dismissed entirely) is written as having a full human form that is as {{Bishonen}} as any other guy in the manga, but this doesn't happen often because Ashitare is mostly undeveloped as a character.
** Tomo and Soi are assumed to hate each other and are love rivals over Nakago; they're not, and they don't. They actually work very well together the one time they're shown doing so. If they aren't written as hating each other, they're usually friends instead, having bonded over having been sexually abused as children (canon in her case, fanon in his). In the same vein, Tomo's real name is usually given as Ruo or Ryo Chuin; the novels name him Ragun.
** Before ''Genbu Kaiden'', Uruki of the Genbu Seishi was usually written as a woman in fanfic because of the star Uruki is represented by. Hilariously, Uruki is a man... who [[GenderBender must change into a woman]] to use his wind powers.
** Whether Nuriko was in love with Miaka romantically or loved her platonically was a subject of fierce debate; the answer depends on whether you're a YaoiFangirl or not.
** Mitsukake (if he's mentioned at all) is sometimes written as having been a military doctor, usually leading to him [[TakeALevelInBadAss getting a power upgrade]]. The rest of the time he's a pacifist with [[WhatKindOfLamePowerIsHeartAnyway lame healey-bubbleys]], which conveniently forgets that his healing powers also exorcise demons.
** Hikitsu and Tomite were often written as brothers.
** Tasuki doesn't like women because of his four older sisters always giving him a hard time, fanfics usually write him as being gay, even if they're not yaoi fics.
*** Not helped by Creator/YuuWatase giving a WordOfGay in regards to him. [[TeasingCreator LOL]].
* There is no Dr. Hikari in ''Manga/LoveHina''. The character was created by a fairly popular fanfic writer and has led some to believe that such a character actually exists in canon.
* The ''Anime/TigerAndBunny'' fandom has concluded that [[ShowWithinAShow HeroTV]] has a forum filled with dirty fanfic... that some of the heroes (mostly [[{{Otaku}} Ivan/Origami Cyclone]]) participate in writing.
* The ''Literature/ArashiNoYoruNi'' fandom strictly believes the film is romance based. The characters however never refer to each other as anything other then friends, though other series have used that term as a substitute for romantic ones. It helps that in the origin books Mei is gender neutral (though WordOfGod is he saw him as male).
* Though ''Anime/GunXSword'' fans are divided as to which member of his harem would have been best for Van, most of the existing romantic fanfics pair him off with Wendy [[spoiler: especially the continuation fics that are set after the show's MaybeEverAfter ending, when a Van X Wendy relationship wouldn't be lolicon]]. Interestingly, several different pieces of continuation fic also assume that [[spoiler: Wendy]] works in a hotel or restaurant after the end of the series, despite there being no direct evidence of this in DistantFinale.
* ''Anime/PaniPoniDash'' may not have one big fanbase like other examples, but if [[http://www.twitter.com/KurumiMomose Kurumi Momose]] and [[http://www.twitter.com.6SayakaSuzuki Sayaka "#6" Suzuki]] are married to each other accourding to their Twitter pages, some people definately must have been quite dedicated on this. It hasn't spreaded through many more fans yet, but it's likely they might get quite some attention.
* For whatever reason the general consensus amongst ''Manga/FairyTail'' fans is that Sting, who is himself blond, would refer to Lucy as blondie. Since he has yet to have a single line of dialogue directed towards her, there is no basis for this.
** Another piece of {{Fanon}} in the fandom is that Dragon Slayers are all {{Yandere}}. There's also the terms of "mates" as if they were.
* ''Manga/MagicKnightRayearth'':
** Fuu is often described as being a ShrinkingViolet or a wallflower because she's TheSmartGirl, [[{{Meganekko}} wears glasses]], and is an avid fan of [=RPGs=]. This despite the fact that she ''never demonstrates any kind of shyness or timidity''. The closest thing to it is her excessive politeness, but she's never afraid to, for example, go up to a stranger with a small gift[[note]]how she met Hikaru in the first place[[/note]] or politely-yet-firmly tell a bratty princess that she won their contest and she's going to escape now, thanks.
** Hikaru's family is assumed to be much less affluent than Umi's and Fuu's, as they both attend elite private schools and Hikaru goes to a public school. However, while the Hououjis and Ryuuzakis both live in ''huge'' houses, the Shidou residence is a very sizable and well-respected kendo school, so they're clearly not poor.
*** Some fans from Latin America think that the Pillar of Cephiro can [[AlwaysFemale only be a woman]] as Eagle is depicted as female in the Spanish dub.
* In most ''Manga/SoulEater'' fan fiction, the 'X' on Ragnarok's face comes from an X-shaped scar he had as a human.
** In canon, Crona speaks clearly most of the time, and only starts to stammer when zhe gets nervous. To read any fic featuring Crona, though, you'd think zhe stammers out every word zhe says.
** It's generally accepted among fans that White Star was the leader of the Star Clan, despite nothing ever being said about his rank.
** Due to a misinterpretation of Spirit's use of a Japanese term for wife ("kamisan"), most English-speaking fans believe that Maka's mother was named Kami. Her name was never actually revealed.
** Many fans like to think that the pillow Crona is seen holding to themself in several episodes was given to them by Maka.
** In fanfics featuring Stein and Marie's children, they usually have ''Literature/{{Frankenstein}}''- themed names like Victor or Shelley.
* It's not drastically unknown for fans of ''LightNovel/MariaSamaGaMiteru'' to give Yumi and Suguru a relationship similar to Yuki and Sachiko, be it romantic or really close and platonic.
* Mashiro from ''LightNovel/ThePetGirlOfSakurasou'' is never stated to have any sort of neurological or mental disorders but amongst western fans at least she's considered to be on the autism spectrum.
* ''Anime/GirlsUndPanzer'':
** The supplementary material stating that men were forbidden from entering Tankery has been interpreted by many fans to mean that men were forbidden to pilot tanks at all, even in war. This has led to lengthy debates about how to reconcile it with the fact that male tankers are depicted in canon and historically male tank commanders (with unequivocally male names) are explicitly mentioned.
** Darjeeling and Orange Pekoe are sometimes assumed to be sisters, and Assam is sometimes assumed to be their sister as well, even though Orange Pekoe refers to them as "Darjeeling-sama" and "Assam-sama" rather than using JapaneseSiblingTerminology.
** Another common piece of fanon is that Shiho Nishizumi is not only head of the Nishizumi school, but also headmistress of Kuromorimine, the school where her elder daughter commands, and where her younger daughter used to attend, despite this not being said at any point.
* Fans of ''Manga/NoMatterHowILookAtItItsYouGuysFaultImNotPopular'' typically view Tomoko as having some sort of mental issue such as Social Anxiety Disorder, Avoidant Personality Disorder, or Depression. There's also a consensus she might be on the autism spectrum as well.
* In canon, [[Manga/DetectiveConan Conan]] occasionally orders iced coffee from restaurants. In fanon however, he's interpreted to be addicted to coffee, usually drinking it black.
* In ''Anime/MaiOtome'' fanfiction, the Aries Republic government building is commonly called "the Hexagon", as its design is a clear reference to the real-life Pentagon that houses the US Department of Defense, but with six sides.
* ''Anime/SmilePrettyCure'' had a popular theory early on as the characters were introduced: someone mistook a certain set of katakana within Akane Hino's character description to read "{{ballet}}", and the theory took hold for a while before someone discovered the correct translation was "volleyball", the katakana for which looks remarkably similar.
* ''Manga/HunterXHunter'': Many fans of the 1999 anime insist Kurapika is female, usually DisguisedInDrag, despite the manga having him as [[DudeLooksLikeALady an androgynous boy]]. The 1999 version differs from the manga so fanon goes with this being another adaptation change.
* Suna as an (often aromantic) {{asexual}} is a frequent headcanon in the ''Manga/MyLoveStory'' fandom.