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->''"Do to them what you do to us at times like that. [...] Tell them ''what'' you're doing but not ''why''. Then let them speculate. Listen to them as they speculate. When they come up with an idea you really, really like, tell them 'You finally guessed right. That was my reasoning all along."'''
-->--'''Hobbie Klivian''', ''ComicBook/XWingSeries''

When {{Fanon}} is "promoted" to {{Canon}}. Whether it's officially shown in a canon work is another matter, and may "only" reach the status of WordOfGod, but most of the time the author sees some minutiae they hadn't thought too much of themselves as a decent enough explanation that they don't mind and don't want to [[{{Jossed}} joss it]] into oblivion. This mainly happens when the theme or subject of the fanon had not been planned out by the author beforehand, and is much more common in works, such as {{fanfic}} and {{webcomics}}, which often aren't planned from the start. Small [[{{Doujinshi}} Doujin]] companies are infamous for this sort of thing, as their characters are designed and occasionally modified accordingly to appeal to their fanbase.

Compare with IKnewIt (where the fan explanation happens to match the one the author had planned all along), AscendedMeme (where this happens to memes), WordOfDante, CanonImmigrant (when elements of an officially licensed non-canon source find their way into official canon), OfficialFanSubmittedContent, ApprovalOfGod (where a creator likes a fan work but doesn't make it into canon). When it's built into the story, it's SchrodingersGun. You could argue this is the creators' decision to ThrowItIn.

Contrast {{Jossed}} (when popular fan theories are explicitly sunk by WordOfGod or onscreen events), BeamMeUpScotty (where the phrase that's well known was never uttered in canon). Inverse of ShrugOfGod.

When this happens between fictional characters, it's a SureLetsGoWithThat. If a particular work has a long and continuous run, fanon may be promoted to canon because a PromotedFanboy is now [[RunningTheAsylum calling all the shots]].

[[Administrivia/RenamedTropes Originally named]] "Sure, Why Not?"

----

!!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* Despite ''Anime/PuellaMagiMadokaMagica'' only having the witch Charlotte appear for one episode as a MonsterOfTheWeek, onscreen for perhaps a minute tops to [[spoiler:kill a main character before being killed herself]], she is [[EnsembleDarkhorse hugely popular]] amongst the fanon. She's often depicted in fanart alongside Mami Tomoe, [[spoiler:the one she killed]], and acted as a sort of TeamPet in many cases. The writers apparently took heed: cue ''Anime/PuellaMagiMadokaMagicaTheMovieRebellion'', and Charlotte, or [[spoiler:Bebe as she was called in-movie]], filled just that role.
* ''Manga/OnePiece'':
** The author has a question and answer column, but half of the time when someone asks about a fact he'll agree with any reasonable guess the writer makes (for instance several of the main characters' birthdays).
-->'''Fan''': Chopper's birthday should be December 24th!
-->'''Oda''': Okay.
** At one point, a fan noted that one of the villains of the show, Rob Lucci, had a name that that could be interpreted as "To rob the light" based on the (inaccurate) fact that Lucci is the Italian word for light. Oda's response was to the general effect of:
--> "You know me. I'm the guy who comes up with the deep meaningful names. Yep. In fact, "Rob Lucci" even means "steal the light," or SO I HEAR (had no idea)."
* The authors of ''Manga/{{Kinnikuman}}'' routinely adapted fan suggested characters into the story, both minor and major.
* Same goes for ''Manga/KongohBancho'', where several fan-characters have gone on to become both minor and major antagonists.
* ''[[Manga/{{Gunnm}} Battle Angel Alita Last Order]]'' accepted a few fan-submitted characters into the [[TournamentArc ZOTT tournament.]]
* ''Anime/CodeGeass'''':
** During the first season, fans joked that Lelouch's maid Sayoko was secretly a [[NinjaMaid ninja]], explaining the occasional flashes of competence seen behind her quiet exterior. Between seasons the staff acknowledged the joke, and in ''R2'' it's revealed that she is in fact the heiress to the Shinozaki ninja clan.
** Somebody made a gag comic in which the Emperor delivers a speech about breasts[[note]]A parody rewrite of his funeral speech for Clovis from episode 4[[/note]]. Creator/NorioWakamoto, the Emperor's voice actor, made a GagDub of said speech word for word.
* The author of ''Manga/{{Saiyuki}}'', previous to the AnimatedAdaptation, wrote down in [[StepfordSmiler Cho]] [[BewareTheNiceOnes Hakkai's]] character profile "voiced by AkiraIshida" as a joke, not expecting to be taken seriously, and was pleasantly surprised that her casting suggestion was accepted.
* ''Anime/DragonBallZ'':
** Some of the Super Saiyan forms and names of the villains were fan nicknames.
** Fanfiction gives Vegeta enough [[SailorEarth long-lost siblings]] to populate a galaxy (and then some). The 2008 special went ahead and ran with that premise.
** From ''WebVideo/DragonBallZAbridged'' (a fan parody, therefore counts as fanon, in fact the most well known of its kind) to ''Anime/DragonBallKai'': Nappa hates the media.
* The [[ActionPrologue opening scene]] of ''Anime/TengenToppaGurrenLagann'' was what the last story arc was originally planned to be like, but re-writes ended up making it [[MindScrew a total mystery]]. When the staff was asked the fan-theory that the opening was an AlternateContinuity where [[spoiler:Simon ignores the Anti-Spiral's plea to stop overusing spiral power and the scene is right before he causes [[TheEndOfTheWorldAsWeKnowIt the Spiral Nemesis]]]] their response was, reportedly, "Sure, why not?"
* In ''Anime/DigimonTamers'', fans mentioned to the writer ChiakiKonaka, that clearly the character of Alice was a ghost. Konaka ''originally didn't intend this when he wrote it'' but when he looked back; admits that's a very possible theory on his webpage.
* ''Manga/KatekyoHitmanReborn'': "Hibird" was the fan nickname for Hibari's unnamed pet bird. Upon hearing this, Akira Amano just made it canon, finding the nickname cute.
* This is actually the case for L's UsefulNotes/{{capoeira}} skills in ''Manga/DeathNote''. The artist said that he wasn't trying to emulate capoeira, he was just trying to think of the best way for L to counterattack in the relevant scene. Nonetheless, he was happy that he had added a little bit to L's character, even without meaning to.
* ''Manga/AxisPowersHetalia'':
** The grouping of [[AnythingThatMoves France]], [[{{Shotacon}} Spain]] and [[ChivalrousPervert Prussia]], called the Bad Touch/Friends Trio, started as fanon based on their appearance together in The War of Austrian Succession. It eventually ended up approved by the author, with them appearing in sketches together, in an omake of Prussia's cleaning game and even getting an ImageSong together.
** The Magic Trio is a fanon grouping of England, Romania, and Norway based on them being the only characters capable of magic. As of Season 5 Episode 2, the Magic Club is shown to consist of two of these three, England and Romania.
* ''Franchise/LyricalNanoha'':
** Fans of ''Anime/MagicalGirlLyricalNanohaAs'' called the first Reinforce "Eins" to distinguish from the other one called Zwei. Then ''Innocent'' [[http://i.imgur.com/8CnfzR5.jpg canonised it.]]
** Arisa's fire-wielding avatar started out as a fan depiction of what she would look like as a MagicalGirl.
* In ''Anime/{{Pokemon}}'', it was always a fan theory that Pikachu's PowerLevel restarted whenever Ash started a new journey. The producers noticed, and finally pulled an actual plot device in the ''Best Wishes'' series by having Zekrom zap Pikachu of all its electricity right as Ash gets off the plane that brought him to Unova.
* ''Anime/NeonGenesisEvangelion'':
** Many fans speculated that the members of SEELE had uploaded their minds into computers once they started to appear as black monoliths instead of human holograms. There was nothing in the series to support this, and ''End of Evangelion'' proved the theory false by showing Keel Lorenz still quite human. However, this was made canon in the ''Anime/RebuildOfEvangelion'' remake movies, as proven in the third movie.
** A lot of fans assumed that Shinji was a SupremeChef, which ''2.0'' wholeheartedly endorsed.
[[/folder]]

[[folder:Comic Books]]
* MarvelComics would often get reader mail that would try to explain away some of the continuity or logical fallacies in the stories. A sufficiently clever explanation would win the fan a "No Prize". When some apparently-not-so-clever fans started writing in asking when they would receive ''their'' No Prize, Marvel responded to them by mailing them... an empty envelope. Sadly, this practice has fallen to the wayside, though oddly, the empty "No Prize" envelope is considered of some value by the more hardcore fans.
** It was a fan theory that the Marvel Universe is called Earth-616 because ''FantasticFour #1'' (the first Marvel Universe comic) came out in 1961 in month 6. Neither the explanation nor the date of FF 1 is actually true, but in the OfficialHandbookOfTheMarvelUniverse other universes were numbered based on their first appearances and using this scheme.
* The [[DeathIsCheap return]] of Stephanie Brown to the Franchise/{{Batman}} universe used the {{retcon}} that Leslie Thompkins had not basically killed Steph as we were led to believe, but rather faked her death and dragged her off to hide out in Africa with her where she'd be safe from psychos in costumes. Decide for yourself whether this was simply the most obvious fix, or whether the legion of forum threads and fix-it fanfics using this exact scenario during the intervening years of her death inspired DC.
** There was a lot of controversy and in-fighting (some of it racial in nature) in the Batgirl fandom when Cassandra Cain (an Asian-American) was replaced by Stephanie Brown ([[MonochromeCasting a white blonde]]), and again when Steph was replaced herself when the original Batgirl, Barbara Gordon, returned. A common compromise in fan works was to feature all three Batgirls in a sort of "Batgirl Inc." or "Team Batgirl" grouping, and DC eventually instituted a similar idea with the League of Batgirls in the ''Future's End'' tie-in to GailSimone's ''[[Comicbook/{{Batgirl 2011}} Batgirl]]'' run.
* Ravage in ''TransformersShatteredGlass'' was originally invented by Dave Willis to star in a couple of ''Webcomic/{{Shortpacked}}'' strips, and later got {{Facebook}} and {{Twitter}} pages as a joke. He ended up so popular that the writers incorporated him into the real comic. He's also basically become the mascot for the ''[[Wiki/TFWikiDotNet Transformers Wiki]]'' fansite.
* The Disney/Boom Comics ''Comicbook/DarkwingDuck'' series reveals that DW had been receiving a stipend from the S.H.U.S.H. agency--one of the more popular theories as to how he could be Darkwing and lead a family life as Drake Mallard with no apparent job.
* The FanNickname "Clor" for the clone of [[TheMightyThor Thor]] from ''Comicbook/CivilWar'' got used in the recap page of ''ComicBook/AntMan and TheWasp'', which was from Eric O'Grady's perspective. Officially though, the character's name is Ragnarok.
* When ''Comicbook/AnimalMan'' meets his writer, ''Creator/GrantMorrison'', the latter expressed regret that he didn't have time to use a few ideas some of the fans suggested (it was his last issue), namely to have Buddy fight animal-themed villains and his [[{{Foil}} polar opposite]], who finds pleasure in animal cruelty. To make up for that Morrison makes them both materialize out of thin air and attack Animal Man, while he is thanking everybody he worked with on the series. He also mentioned that Buddy is what writers wants him to be, so if they'll decide to make him eat meat, he will. Next writer on the series decided to play with that and wrote a story where Buddy copies the abilities of a lion, its overcome by its instincts and tries to eat a gazelle.
* For a long time, HarleyQuinn and Poison Ivy were speculated to be [[DepravedBisexual bisexual lovers]] by some Franchise/{{Batman}} fans, with many pointing to their LesYay moments from ''WesternAnimation/BatmanTheAnimatedSeries'' as evidence. The final arc of ''ComicBook/GothamCitySirens'' finally acknowledged this, with Harley accusing Ivy of being in love with her, and Ivy subsequently admitting to it in a later issue.
* Likewise, there was fan speculation for ''years'' that Element Lad from the ''Comicbook/LegionOfSuperheroes'' was gay, mostly due to his pink costume. It wasn't until 1992 that he was confirmed to be [[BiTheWay bisexual]].
* This was the exact reason we have the explanation for the origin of CaptainAmerica's legendary shield. A fan by the name of "Fred Janssen" wrote in to the 60's-era Captain America comic with a theory involving Dr. Myron [=McClain=] and his work with Adamantium and Vibranium, the fictional super alloys in the Marvel Universe. Marvel liked the idea so much that, with a bit of altering, they took it and ran with it!
* The controversial SpiderMan story ''Sins Past'' revealed that in the past, Gwen Stacy slept with Norman Osborn, without revealing when or why. BigNameFan J.R. "Madgoblin" Fettinger pored through his back issues and found a time when it could have happened and a reason why she might have done so at that point in time; namely, that Osborn had saved her father from the Kingpin, she had gone to see him to thank him, and one thing led to another. After posting this theory on his website, [[http://www.spideykicksbutt.com/GreenwithEvil/DeFloweringGwen.html here]], some of Marvel's writers found it and decided it worked, so they canonized it.
* In ''ComicBook/RedHoodAndTheOutlaws'' Arsenal calls Red Hood by his FanNickname "Jaybird." Red Hood is not pleased.
* The 9th issue of ''ComicBook/MyLittlePonyFriendshipIsMagicIDW'' used a FunnyBackgroundEvent to make canon the popular fanon about Time Turner being actually the Doctor (by making him open his fob watch and recover his memories) plus making his relationship with Derpy Hooves canon, even if she doesn't knows him yet.
* While covers for the IDW comics had often put the spotlight on popular background characters and fan-characterizations, the pages of the ''ComicBook/MyLittlePonyMicroSeries'' gave Derpy Hooves a letter carrier uniform and a mail bag.
* In actual continuity, the character Midnighter from ''ComicBook/TheAuthority'' very, very rarely removed his mask, which covered his hair. Due to this, the few times he did take it off, his hair color kept changing because the colorists didn't know what color it actually was, it ranged from blond to black and everything in between, except red. Fanfic writers decided that he dyed his hair, which was naturally red, to explain away the constantly changing hair colors. This was later made actual canon in an issue of Stormwatch: Team Achilles.
* The five Life Foundation symbiotes that appeared in the various ''Comicbook/{{Venom}}'' miniseries in [[TheNineties the '90s]] were never actually given names in the comics. Most were referred to simply by their host names while one, Donna Diego, was simply called [[ExactlyWhatItSaysOnTheTin the Female Symbiote]]. The Female Symbiote and another one got the names Scream and Lasher for a toy line while another symbiote in the line (though not from the comics) was called Riot; the other two had no names but were referred to by fans as Agony and Phage. Scream became canon during a handbook released around the time of the Back in Black storyline in the mid-2000s while it wouldn't be until 2011's ''Carnage USA'' miniseries that officially gave the fan names to the other ones as well.
** Speaking of Venom, when Flash Thompson gained a hold of the Venom symbiote, the fact that he was acting in a spy-like manner and a soldier would lead fans to call him "Agent Venom". When Flash joined the ComicBook/SecretAvengers, the name became canon.
* After ''Film/TheAvengers'' came out, fans coined the term "Science Bros." to describe the friendship between [[Comicbook/IronMan Tony Stark]] and [[Comicbook/TheIncredibleHulk Bruce Banner]]. The term was later used in solicitations for the ''Avengers Assemble'' comic book before officially making its way into canon in ''Comicbook/OriginalSin: Hulk vs. Iron Man'' #1.
[[/folder]]

[[folder:Fan Works]]
* ''Fanfic/NobodyDies'' is particularly notable for going meta, with multiple [[ExpandedUniverse fan fictions]] of it. A few of them, like [[http://www.fanfiction.net/s/5881723/1/NGE_Nobody_Dies_The_Kei_Files The Kei Files]] and [[http://www.fanfiction.net/s/6061370/1/Nobody_Dies_The_Story_of_NERVAlaska The Story of Nerv-Alaska]], were canonized and referenced in the main material. Sometimes it also happens just from the discussion threads:
-->'''Poster:''' Also, Colbert in a high ranked American government office would SO explain Go-kun's original AI.
-->'''[[WordOfGod Gregg:]]''' It's canon in my book! (President Colbert later makes an appearance in the story.)
* "[[Wiki/{{Uncyclopedia}} Uncycylopedia]] (which is online encyclopedia like [[{{Wikipedia}} wikiped]]) said [[Creator/PeterChimaera I]] was writing story called [[Fanfic/QuarterLifeHalfwayToDestruction Quarter-Life: Halfway to Destruction]] and dontn't know where come but [[{{Defictionalization}} I decide to write anyway]]."
* Several small aspects of the ''FanFic/HarryPotterAndTheMethodsOfRationality'' revised canon were proposed by posters to the author's blog; for instance, the distribution of StableTimeLoop-inducing {{Time Machine}}s to students in order to deal with their class schedules is, canonically, due to wizards looking at the hard problem of writing a conflict-minimizing schedule given classes and requesting students and brute-forcing it with magic. Yudkowsky establishes early on wizarding math basically stops at trigonometry. Presumably, you have a lot less incentive to learning how to work within the laws of the causality when you can just ignore them.
* A fanfiction author wrote how [[WesternAnimation/TheGrimAdventuresOfBillyAndMandy Grim and Mandy]] ended up getting married in ''FanFic/GrimTalesFromDownBelow'', and Bleedman added the whole thing in. Both this and the ''Webcomic/PowerpuffGirlsDoujinshi'' feature quite a lot of this, with one of the most notable early instances being [[http://www.snafu-comics.com/forum/viewtopic.php?f=2&t=23378 the addition of the Rowdyruff Boys]].
* Two of Jakayrta's stories in the ''FanFic/PokeWars'' universe are regarded as canon by Cornova himself.
* In ''Fanfic/KyonBigDamnHero'', Kyon's {{Morph Weapon}}s were named [[StellarName Altair and Vega]] after it was proposed on its [[WMG/KyonBigDamnHero WMG page]].
* A reviewer proposed during the St. Galleria arc of FanFic/TheTaintedGrimoire to have Luso get Parivir clothing when he actually becomes a Parivir. The author worked this into the story in Chapter 65.
* ''FanFic/PonyPOVSeries'':
** Some reviewers took to calling the [[BadFuture Dark World]] version of Applebloom "Saint Applebloom" due to her [[TooGoodForThisSinfulEarth characterization]] in that timeline. Eventually, this is shown to be how the Apple/Pie family refer to her.
** One piece of RecursiveFanfiction gave [[BigBad Discord]] the full name of Discordance Apophis Typhon. This was eventually made canon, with Typhon becoming the surname for all the draconnequi.
** Numerous recursive fanfics have declared part of the established multiverse.
** [[http://dalekolt.deviantart.com/gallery/#/d5b4hks This]] piece of fanart (a sequel to a certain scene in Dark World) was eventually inserted into the fic.
** Alexwarlorn noted that despite describing Pandora with a fox's tail, fanart kept showing her with a lion's tail instead. Eventually, he had Discord comment that Pandora went through a phase where she replaced her lion tail with a fox's for a while before going back.
** [[spoiler:[[TheVoice The Nameless Passenger]]]] in Dark World is eventually revealed to be an evolution of [[spoiler:Nightmare Purgatory]] from the "Fading Futures" RecursiveFanfiction.
* Downplayed: the name of Fanfic/TheCalvinverse was originally derived from its trope page (when asked about it, [[Creator/{{garfieldodie}} one of the authors]] responded with a ShrugOfGod). The same person acknowledged it near the end of the author's notes for the final chapter of ''Fanfic/CalvinAndHobbesTheSeries''.
* The ''Fanfic/{{Pokeumans}}'' fan series then developed fan series of its own following its particular idea, which had plenty of scope in it. Certain concepts and terms used in the spin-offs made it into the original ''Pokeumans'', from simple things like the term 'Extinctionists' to The Board of Dream Messengers, in the wake of the ridiculously number of protagonists with a SpiritAdvisor which is now a community-wide concept.
[[/folder]]

[[folder:Film]]
* The ending of ''Film/{{Saw}}: The Final Chapter'' in which [[spoiler:Dr. Gordon is revealed to have been acting as an accomplice to Jigsaw ever since escaping his trap at the end of ''Saw'' 1]] was a long standing fan-theory before finally being written into canon.
* ''Franchise/PiratesOfTheCaribbean'':
** ''At World's End'' featured one of these when Keith Richards was written into the film as Captain Teague, Keeper of the Code [[spoiler:and Jack Sparrow's father]] after, as Terry Rossio put it, "the world collectively woke up one day and decided that Keith Richards was going to be in these films." This was likely due to Creator/JohnnyDepp discussing it in interviews, since he was an influence of Depp's portrayal of Jack Sparrow.
** In the same film Barbossa's first name is "Hector", an idea that was worked out privately with Depp and Rush while filming ''Curse of the Black Pearl'', and caught on with fans after Depp mentioned it in the [=DVDs=] commentary.
** Lt. Theodore Groves, played by Greg Ellis, was just "Groves" in the first movie, but fans took a shine to him and gave him a first name and a backstory, much to the actor's surprise and delight, and the creators were [[{{Pun}} onboard.]]
* ''Franchise/TransformersFilmSeries'':
** In ''Film/{{Transformers}}'', a very common fan theory was that [[spoiler:[[TheStarscream Starscream]] was among the F-22s that fire on Megatron in the climax.]] The producers haven't said definitely that it's canon, but their stance so far has been "Sure, why not?" The tie-in comic ''The Reign of Starscream'' acknowledged this by having Starscream consider it, but decide not to.
** When one of the writers was answering fans' questions in a forum topic on the movie's website, he was asked how Bumblebee was suddenly able to speak at the end of the movie. His answer was that the healing laser Ratchet used earlier in the movie had repaired Bumblebee's vocal processor. When another fan suggested that Bumblebee was healed by the [[MacGuffin Allspark]], which was clearly shown to heal another damaged Transformer earlier in the movie, the writer admitted that that explanation did make more sense than his answer.
* ''Franchise/StarTrek'':
** ''Film/StarTrek'' canonizes Uhura's first name of Nyota, which was invented by fan William Rotsler and endorsed by Nichelle Nichols, and had been generally adopted for years. (Though, technically it's only ''known'' to be her name in the alternate timeline of the movie, not the original one.) The same movie canonized the names George and Winona for James T. Kirk's parents, coined in a novel by Vonda [=McIntyre=].
** ''Film/{{Star Trek VI|The Undiscovered Country}}'' finally made official Sulu's personal name of Hikaru, which was the most popular one used since Vonda [=McIntyre=] gave it to him in another novel a decade earlier.
** Kirk being from Iowa was fanon before ''Film/{{Star Trek IV|The Voyage Home}}''. Someone told Nicholas Meyer, who was one of the film's writers, that Kirk was from Iowa. Consequently, it ended up in the film and became canon.
* [[AscendedExtra Boba]] [[EnsembleDarkhorse Fett]] from ''Franchise/StarWars'' has maybe 20 minutes total screen time in the original trilogy, gets knocked into a pit by a blind guy, but has been written about so much in the [[Franchise/StarWarsExpandedUniverse Expanded Universe]] that Creator/GeorgeLucas [[WordOfGod himself]] has promoted him clawing his way out of the Sarlacc to canon with little more than "sure, why not?" It had reached the level of fanon that Boba Fett's armor was the type worn by the predecessors of the Imperial Stormtroopers during the Clone Wars (this was based on a statement in the novelizations, which said the armor dated back to the Clone Wars). This ended up being excruciatingly close to the truth (the Clone Troopers original armor was a mass-produced version of Jango Fett's armor without most of his cool gizmos.)
* ''Film/TheLordOfTheRings: The Fellowship of the Ring'' features an elf in the Council of Elrond scene who is literally onscreen for 3 seconds, says nothing, and indeed is barely noticeable standing behind Legolas. But fans, being fans, [[MemeticBystander latched on to this character]] (played by Bret [=MacKenzie=] of ''FlightOfTheConchords'' fame) and formed stories and relationships around him, bestowing upon him the name "Figwit" (an acronym for "Frodo is great... [[HeyItsThatGuy who is that?!]]"). So big was his fanbase that he was brought back for ''Return of the King'', actually given a couple of lines, and--though officially credited as "Elf Escort"--is called "Figwit" in the filmmakers' DVD commentary. Canonization was complete when [=MacKenzie's=] character appeared in ''Film/TheHobbit'', this time named on-screen as Lindir ("the singer").
* The ''Film/{{Phantasm}}'' "phandom" has long used term "Sentinel Spheres" to refer to the silver spheres. They are occasionally referred to as such by Don Coscarelli during the DVD commentaries as well, suggesting that he's adopted this term for them.
* When an aficionado asked the creator of the Na'vi language from ''Film/{{Avatar}}'' if the word for 'star' (tanhě; pl. sanhě) also was used for the Na'vi bioluminescent freckles, he said sure, why not.
* The very last scene of ''TheGrifters'' is a distant shot of Creator/AnjelicaHuston's character driving away down a dark street. Just before the FadeToBlack, a man dressed similarly to Creator/JohnCusack's character runs across the street. When someone asked the producer, Creator/MartinScorsese, if it ''was'' Cusack's character, he reportedly replied, "Sure, Why Not?" In actuality, it was just some random civilian who wasn't supposed to be in the shot.
* ''WesternAnimation/TheLEGOMovie'' features several characters referring to LEGO pieces by their {{Fan Nickname}}s, such as a 3063 Brick, Round Corner 2x2 being called a "macaroni brick".
[[/folder]]

[[folder:Literature]]
* ''Literature/HarryPotter'':
** In later books, after TheFilmOfTheBook made "I shouldn't 'ave said that!" into Hagrid's CatchPhrase, it became one in the books as well.
** When it was brought to Rowling's attention that Marcus Flint seemed to have repeated a year, [[http://www.jkrowling.com/textonly/en/faq_view.cfm?id=16 her response]] was "Either I made a mistake or he failed his exams and repeated a year. I think I prefer Marcus making the mistake."
** Near the end of ''[[Literature/HarryPotterAndTheDeathlyHallows Deathly Hallows]]'', a singing Peeves uses the name "Voldy" to refer to Voldemort. The fandom invented this dismissive name: Rowling said on her official site that she "thought it was very amusing when [she] found a chat room full of people calling him 'Voldy'."
** Lupin's facial scars, which are never described in the books, have supposedly been appearing in fanart before his appearance in the third movie.
** Big time fan John Noe is a huge fan of the Auror Dawlish, who despite [[InformedAbility getting O's in all his O.W.L.s]] [[TheWorfEffect can be bewitched and hexed by everyone including Neville's grandmother]]. Dawlish doesn't have a first name, and when Noe interviewed J.K. Rowling, she decided to give him the first name John, being named after John Noe.
** An interesting shipping example: About the time ''[[Literature/HarryPotterAndTheDeathlyHallows Deathly Hallows]]'' (the book) came out, WordOfGod confirmed that [[spoiler:Neville Longbottom marries Hufflepuff and future landlady of the Leaky Calderon Hannah Abbott, while Luna goes on to marry Rolf Scamander, grandson of ''Fantastic Beasts and Where to Find Them'' author Newt Scamander]]. But in the [[Film/HarryPotter Film Of the Book]], [[spoiler:Neville runs off to confess his love to Luna in the middle of the battle, and in their last shot, they're [[MaybeEverAfter sitting next to each other smiling]]]]. When asked about this pairing by fans, JK said that she honestly never considered pairing them off.
** It's unknown whether it's this trope or IKnewIt, but ''Fanfic/TheDracoTrilogy'' popularized "Malfoy Manor" as the name of Draco Malfoy's family home. Seven years later, the name was used in ''Deathly Hallows''.
** It's possible that James Potter, Sirius Black, Remus Lupin and Peter Pettigrew referring to themselves as "The Marauders" is this, as the nickname first appeared in the third book on the map as the "Marauder's map" rather than the "Marauders' map."
** There's a push in the fandom for a black actor to be cast to play Newt Scamander (author of ''Fantastic Beasts and Where to Find Them''). The description of Scamander's grandson as "swarthy" in a WhereAreTheyNow sequel short story [[http://allerasphinx.tumblr.com/post/91171494567/inkyopinions-last-of-the-ringleaders-of can taken as supporting this]].
* Philip Pullman was once asked why certain minor characters in ''HisDarkMaterials'' have daemons who are the same gender as they are (most people have daemons of opposite gender and the narrative says so). When his questioner asked if it meant that those characters were gay, he basically said "sure, why not" -- he had never actually been able to come up with a reason for it.
* Peter Goldworthy's ''Maestro'' features a piano teacher/virtuoso living in Darwin, Australia, having fled the Nazis from his native Vienna. As Maestro is a high-school study favorite in Australia, it spawned a classroom theory that this was intentional on the part of the author: Having fled from Der Wien in Austria to Darwin in Australia was a metaphor showing that the maestro had never really come to terms emotionally with his forced migration. On part of a speaking tour, one high school student finally got to put this theory to the author, and ask if it was true. Peter Goldworthy's memorable response: "It is now." (Which is slightly odd, considering that Wien is a city's name and has no pronoun. You would never, ever catch a German speaker saying "der Wien", just like no English speaker would ever say "the London". Also cities are grammatically neuter in gender in German, so if anything it should be "das Wien". And let's not get into that a dative should have been used here, "aus dem Wien".)
* The Trakata lightsaber combat, ''Franchise/StarWars'' fanon made canon by ''Roleplaying Game: Saga Edition Core Rulebook''.
* Armistead Maupin had already named his ''TalesOfTheCity'' secretly transsexual character Anna Madrigal when a fan pointed out that this name was an anagram for “a man and a girl”. He later had Anna claim that she had chosen her post-op new name specifically to give this "clue".
* ''Literature/WarriorCats'':
** Someone suggested on the facebook of the author that there should be a [[{{Doorstopper}} Super]] [[ExpandedUniverse Edition]] about Yellowfang. A few months later, she announced that the next Super Edition would be called Yellowfang's Secret.
** ''[[Literature/WarriorCatsDawnOfTheClans Dawn of the Clans]]'', the FanNickname for [[{{Prequel}} the fifth arc]], became the series' official title.
** When Smokepaw fell off a cliff during the Great Journey, one fan wrote a fanfiction in which he survives the fall and returns to his clan. A few books later, he is listed in the Shadowclan allegiances as Smokefoot, a warrior.
* ''Literature/{{Xanth}}'':
** Prince Dolph (who is still a child) manages to find himself engaged to two different women, both of whom have to marry him BecauseDestinySaysSo; one, Nada Naga, because of a prophecy, and the other, Electra, because she's under a curse that will kill her if Dolph doesn't go through with the marriage. Obviously, he can't marry them both (though Dolph doesn't understand why not), and to make matters worse, although Dolph prefers Nada, she would much rather be JustFriends, while Electra really does love him (even if it's magically compelled). Piers Anthony's originally planned resolution, to occur in a later book in the series, was to have him marry Electra, divorce her one day later, and then marry Nada, who will get around the whole "not in love" thing by voluntarily drinking a LovePotion. However, a ''reader'' spotted a [[ProphecyTwist loophole in the prophecy]] -- to "marry" someone can also mean to ''perform their wedding ceremony''. After reading this fan's letter, Piers Anthony quickly rewrote the ending, and Dolph and Electra lived HappilyEverAfter.
** Anthony has openly allowed the fandom to [[RunningTheAsylum run the asylum]] through write-in submissions for years, so there are many other examples of readers' suggestions becoming canon.
** It would be remiss to mention ''Xanth'' Fanon and not mention the puns, which are a form of Ascended Fanon all of their own. Early in the series, a few puns worked their way into the stories. A few young readers sent in pun suggestions, which Piers Anthony included in the next novel in the series and mentioned the readers by name in the author notes. Now ''Xanth'' is known for being full of these puns, which have directly and completely shaped the world, taking it from a rather static fantasy world to something decidedly more, and Piers Anthony is now known for his ungodly huge (chapter-sized) author notes thanking every single reader for every single pun he uses. To the point where he has spent the last several books asking his readers to ease off. He's repeatedly said the books would be much easier to write if the readers stopped trying to help him.
* In the ''Literature/HonorHarrington'' series, the names "podnought" and "SD(P)" for [[MacrossMissileMassacre missile pod-laying superdreadnoughts]] were originally {{Fan Nickname}}s used on Creator/DavidWeber's web forum. They got made official.
* Occasionally happens with the works of Creator/TamoraPierce (''Literature/TortallUniverse'' and ''Literature/CircleOfMagic'') when talking to her fans on fora or blog posts. For example, one reader said that ''naturally'' Delia of Eldorne's tower prison would include magical barriers. Pierce's reply? "Oooh, yes!"
[[/folder]]

[[folder:Live Action TV]]
* ''Franchise/StarTrek'':
** The Klingons' gaining forehead ridges between the original series and the movies and later series has long been a subject of fan speculation. In the ''[[Series/StarTrekDeepSpaceNine Deep Space 9]]'' TimeTravel episode "Trials and Tribble-Ations", two popular fan theories are brought up by two non-Klingon characters, but are told by Worf that Klingons don't discuss the situation with outsiders. Eventually, the prequel series ''[[Series/StarTrekEnterprise Enterprise]]'', which had ridged Klingons, had to tackle not just the "how'd Klingons get ridges?" question, but "how'd Klingons lose their ridges and then get them back?" A multi-part episode shows it happening in a way that actually incorporates both theories. Another {{Fanon}} theory, which hasn't been endorsed by the powers that be yet, is that they underwent cosmetic surgery in between [=TOS=] and [=DS9=]. The real reason, which is not hidden, was the low budget of the original series, which was not intended to be so big. They shot themselves in the foot by having Kor, Kang, and Koloth from the original series show up in ''[[Series/StarTrekDeepSpaceNine Deep Space Nine]]'' as modern Klingons. And by not having the ''Enterprise'' Klingons look more like the ''TOS'' Klingons, which would have simplified the problem. This is probably why the deleted scenes from the rebooted ''Film/StarTrek'' film show Klingons on Rura Penthe wearing masks. However, even the ''Enterprise'' explanation doesn't say that all Klingons lost their ridges. Apparently, only the ridgeless ones were allowed in the fleet, but there's no reason why prison guards couldn't have ridges.
** "Future Guy"'s name in ''Series/StarTrekEnterprise'' came from a written review of "Broken Bow" by ''Trek'' commentator Chuck Sonnenburg (Website/SFDebris). Eventually, fans started using it to refer to the humanoid figure and eventually, the producers of Enterprise used it as the character's actual name in the script. In his video review of "Broken Bow" years later, Chuck commented how it pains him that what should have been the BigBad of the series ended up taking a name derived from sarcasm, another sign of how the Temporal Cold War was poorly plotted and poorly planned.
* ''Series/DoctorWho'':
** The popular fan theory about a series of unaired adventures known as "season 6B" (essentially, that the Second Doctor continued adventuring in some capacity after he was captured but before regenerating at the end of season 6) that is used to plug up continuity holes has been used in some of the Franchise/DoctorWhoExpandedUniverse media.
** Eve Myles' characters Gwyneth and [[Series/{{Torchwood}} Gwen Cooper]] were originally meant not to have any relationship to one another, but fans continued to speculate about it. [[spoiler: The Series 4 finale briefly "explains" the resemblance as [[{{Technobabble}} "spatial-genetic multiplicity"]].]]
** Part of the TheReasonYouSuckSpeech in "[[Recap/DoctorWhoS32E7AGoodManGoesToWar A Good Man Goes to War]]" sees current executive producer Creator/StevenMoffat saying "Sure, why not? to... [[https://groups.google.com/group/rec.arts.drwho/browse_thread/thread/7cd734f99a62ae98/c845f05e9b213df9?pli=1 his past 90s fan self]].
** Moffat had earlier ascended into canon, in "The Girl in the Fireplace", his theory that the reason why the Doctor refuses to give his true name to ''anyone'', even to his companions, the people he loves and trusts most in the whole universe, is because there is a dark secret behind it that he can ''never'' share. [[spoiler: This later became a plotline at the end of Series 6, when its revealed that the reason Silence are so eager to kill the Doctor is to prevent the Question being answered; the oldest Question in the universe, hidden in plain sight... "Doctor ''Who?!''"]].
** "The Doctor's Wife" confirms three whopping big theories. Yes, Time Lords can change sex when they regenerate. Yes, the TARDIS' continual unreliability in taking the Doctor where he wants to go is deliberate. And yes, [[CargoShip Doctor/TARDIS]] is canon. Thank you, Creator/NeilGaiman.
** In "Asylum of the Daleks" Moffat incorporated a full size model Dalek that Creator/RussellTDavies had made as a fan, thus bringing it into the canon.
** Ever since "Blink", fans have wondered if a Weeping Angel would be frozen if it saw its own reflection in a mirror. A short scene in "The Time of the Doctor," four series later, finally indicated that that was the case.
* ''Series/{{Torchwood}}'':
** After thousands of fan fiction stories, Ianto Jones now makes the best cup of coffee in the world, to the extent that it's one of the reasons he got a job at Torchwood in the first place.
** The name for Torchwood's pet pterodactyl, "Myfanwy", started as an off-screen joke by cast and crew but made it onto the extra-textual website canon if not the show itself.
* ''Franchise/PowerRangers'':
** The tendency of the fandom to refer to the Power Coins by their totem animal rather than their color has absolutely no basis in the series itself, and its earliest known use was in the fanfics of [[BigNameFan Joe Rovang]]. However, as this caused a great deal of confusion when discussing different sets of coins with the same color, his precedent was followed above the show's. This is particularly apparent when Disney's official site for PR uses "Dragon Coin" for the Green Ranger's Power Coin, as Rov did, rather than "Dragonzord Coin" as the morphing call ''used in every episode featuring the Green Ranger'' would imply.
** As it only originated in obscure production documents from Saban Entertainment, Billy's surname of "Cranston" was known mostly by fans and not even staff members of the series. When Disney later culled the knowledge of those selfsame fans to construct their official site they just ran with it. This also led to the AscendedFanon status of Jen and Katie's surnames from Series/PowerRangersTimeForce.
** In ''Series/PowerRangersSPD'', among the A-Squad members, only Charlie was actually named, so the fans made up names for the other four and the creators agreed, even though the names themselves were never mentioned on-screen.
* Jack O'Neill and Samantha Carter of ''Series/StargateSG1'' were originally not intended to have romantic feelings for each other. Only when the fans began the Jack/Sam ship did the show writers realize that, indeed, the chemistry was there, and began working this into their story. Whether or not it was actually to the benefit of said story, though, is [[PlotTumor another question]].
* ''{{Friends}}'': in the DVDCommentary, one producer admitted she'd had ideas for Chandler and Monica for several years (as a brief fling) but it never seemed quite right to introduce it until the fourth season finale occurred and it was slipped into that episode. The producers still viewed it as being a brief fling that fizzled out quickly, but the fandom responded so strongly to the actors chemistry with each other that the producers decided to make it a lasting relationship involving marriage and children.
* ''Series/{{Lost}}'':
** The unnamed bearded man who [[spoiler:kidnapped Walt]] in season 1 was given the nickname "Mr. Friendly" by the writers (because of his polite demeanor), a nickname which caught on with fans. Even after his name was revealed as [[SomeCallMeTim Tom]], press releases continued calling him Mr. Friendly. At Comic-Con 2010, the writers just shrugged their shoulders and gave the character's official full name as "Tom Friendly".
** Another instance also involves Tom: at one point he mentioned that Kate, the show's most desired woman, was "not his type". Immediately fans began a running joke that he was gay. The actor heard about it and liked it, and started playing Tom that way (albeit subtly). Eventually the writers put it in the script.
* The characters Cecily and Halfrek in ''Series/BuffyTheVampireSlayer'' weren't supposed to have anything to do with each other other than both being played by Kali Rocha, but after many fans theorized that Halfrek (a demon) could have been undercover as Cecily, the writers made a small reference to it, and got its own story in one of the comics.
* ''Series/{{Glee}}'':
** In order, there's Finn's mom and Kurt's dad getting together, Rachel and Puck hook up once again (as well as the AscendedMeme that is [[PortmanteauCoupleName Puckleberry]]) and Artie finally having a dance number.
** Santana and Brittany's RelationshipUpgrade, which started out as a Fanon theory before proceeding to inside joke for the fandom and then to a full-blown storyline.
** "Heart" gives us two more in [[spoiler:Sugar and Rory]] as well as [[spoiler:Karofsky]] being in love with Kurt.
* In ''Series/{{Community}}'', the overwhelming fan response to the semi-accidental Jeff/Annie pairing seems to have influenced writers to [[spoiler: have Jeff/Annie make out in the season 1 finale.]]
* In ''Series/LawAndOrderSpecialVictimsUnit'', the LesYay between Alex and Olivia was originally unintentional. Neal Baer, the executive producer, read about the LGBTFanbase that was developing about them, and worked it in, giving them more scenes together and more hints that they might be discreetly together. To the point where even Stephanie March (Alex's actor) has said that it is possible that they are just very quietly in love, it being a ''Franchise/LawAndOrder'' and all.
* In ''Series/DesperateHousewives'' season five finale Mike gets married to a woman, whose identity isn't revealed. The woman was supposed to be [[spoiler:Katherine]], but because of insisting fans plans were remade and [[spoiler:Susan]] became the bride.
* ''Series/BabylonFive'':
** In the episode "Shadow Dancing", a ritual (one of the 333 Minbari marriage rituals) is mentioned whereby Delenn must watch Sheridan while he is sleeping in order to see his "True Face." A Usenet user commented "So a man's true face is all mushed up against the pillow and drooling?". A few months later, this is referenced in the episode "Atonement" by Sheridan when the ritual is performed.
** Zack's comments about his uniform not fitting properly were taken verbatim from his actor's complaints (which he was astonished JMS knew about). Similarly, actor Bil Mumy was the one who decided that Lennier (whom he played) was [[spoiler:in love with Delenn]], and sold JMS on the idea of making it canon.
* In a host segment of the ''JungleGoddess'' ''Series/MysteryScienceTheater3000'' episode, Joel introduces the bots as Jackie Gleason did with his fellow cast members at the end of every episode of The Honeymooners, prompting him to introduce Crow as "Art Crow!" (a reference to Art Carney). A child fan of the show missed the reference and sent Best Brains a drawing of the cast labelling Crow as "Art" under the impression that that was his actual name. The letter was shown on the show and ever since Crow was occasionally called "Art" (usually by Pearl Forrester) as a RunningGag.
* A rather startlingly large example with DawsonsCreek: [[ChildhoodFriendRomance Dawson and Joey]] were originally supposed to be the OfficialCouple who ended up together long-term, with Pacey as merely a funny RecklessSidekick. However, Joey and Pacey eventually became the FanPreferredCouple to a strong degree, and as a result, they end up together in the series finale.
* ''Series/{{Scrubs}}'':
** Neil Flynn was reportedly asked if J.D.'s inexplicable crippling fear of pennies stemmed from the infamous "penny in the door" that began the perpetual feud with Flynn's Janitor. His response: "I have no idea who you are or where you come from, but sure, why not?"
** The character "The Todd" originally had [[OnlyOneName no last name]]. That was until a fan noticed that he was wearing a nametag with the name Quinlan. This was just a random prop, but thanks to this fan he is official Dr. Quinlan.
* On ''TheVampireDiaries'', Caroline and Klaus's budding relationship seems to be a result of an almost CrackPairing that was popular in fanfiction.
* The city the North American half of ''Series/{{Highlander}}'' takes place in was officially named Seacouver after fans began using the name to refer to the previously unnamed city.
* ''Series/TheXFiles'' writers started hinting about Mulder's [[AllMenArePerverts porn obsession]] after it became popular with the fans.
* In ''{{Series/Smallville}}'', "Hex", Chloe's [[LampshadeHanging lampshade-heavy]] summary of some of the bad "development" she got is [[SelfDeprecation suspiciously similar to some fan's negative take on it]].
* With regard to the end of ''Series/SpartacusBloodAndSand'', writer Steven [=DeKnight=] has said in an interview that so many fans tweeted him that survivors [[spoiler: Agron and Nasir]] are going to own a goat farm and live happily ever after, that this is now his head-canon as well.
* [[spoiler:Coulson]]'s [[HesJustHiding death]] in ''Film/TheAvengers'' was being undone in fanfic as soon as the movie came out. Subsequently, ''[[Series/AgentsOfShield Agents of S.H.I.E.L.D.]]'' not only establishes that he's alive, he's [[BreakoutCharacter the lead character of the series,]] and ABC even borrowed the fandom's "#[[spoiler:Coulson Lives]]" slogan as part of their advertising campaign. The film itself arguably laid the groundwork for the character's survival, however, so how much was planned in advance and how much is this trope is open to some debate.
** Before Season 2, a lot of comic fans have written fanfics that included the comic book character ComicBook/{{Mockingbird}}, often depicted her as good friends with Coulson. Going from the promo at San Diego Comic Con, Mockingbird, who's indeed coming in in the second season, is going to be a good friend of Coulson's, trusted enough to be able to call him up directly and offer to help.
* The first season of ''Series/GameOfThrones'' gave us [[ForeignFanservice Shae]] who refused to tell Tyrion where she was from, only telling him that she was [[MathematiciansAnswer "Foreign"]]. [[Creator/SibelKekilli The actress that played her]] is German and used her natural accent. The second season introduced the master assassin Jaqen H'Gar who's actor also was german, using his natural accccent -- only this time there was a plot point that he was an assassin from the City State of Lorath. Cue a Point late in the season where Cersei pegged that Shae was Lorathi based on her accent.
* ''Series/UglyBetty'':
** A whopper in the first season: "The Masked Woman" who appeared frequently early on was strongly implied to be [[spoiler:Fey Sommers]], presumed dead after a car crash. She even made occasional appearances at her grave site and the Mode offices as part of a scheme to drive Bradford Meade insane and/or land him in jail. Thanks to rampant fan speculation, "The Masked Woman" was instead revealed to be [[spoiler:Alexis Meade, presumed-dead son of Bradford and Claire, who faked his death and underwent a sex change after Bradford disowned him for wanting to be a woman]]. She came back to rub it in.
** To a lesser extent, Daniel's realization of his romantic feelings toward Betty in the series finale was a ShrugOfGod to very vocal shippers who had boycotted the show after creator Silvio Horta declared that Daniel and Betty [[ShipSinking would never be paired as a couple]].
* In ''Series/BattlestarGalacticaReimagined'', Leah Cairns (who played the pilot Racetrack) famously started integrating UnresolvedSexualTension with Helo into her character after she discovered a piece of Helo/Racetrack fanfiction (in which the pilot attempted to seduce Helo and failed) and read it out loud at a cast party.
[[/folder]]

[[folder:Music]]
* The song "Alive" by Music/PearlJam, wherein the lyrics are about a widowed woman who grows sexually attracted to her son because he looks just like his deceased father, a textbook example of LyricalDissonance. This hasn't stopped fans from embracing it as an anthem of celebrating life. Eddie Vedder, having written the song partly from his own experience, gradually found that what he saw as the "curse" of the song had been lifted by fans' more uplifting interpretation.
* "Purple Haze" by JimiHendrix; the lyric "excuse me while I kiss the sky" was [[{{Mondegreen}} so commonly heard as]] "excuse me while I kiss this guy," that Hendrix changed it. He was also known to point and kiss in the direction of a guy (usually his tour manager) immediately after singing the line.
** This is the same case with "Bad Moon Rising" by CreedenceClearwaterRevival. The actual lyric is "There's a bad moon on the rise," but it was often misheard as "There's a bathroom on the right." John Fogerty has been known to sing this line in live performances of "Bad Moon Rising."
** Likewise, in TheyMightBeGiants' song "Ana Ng" the line "Where the world goes by like the humid air" is often misheard as "Where the world goes by like the human hair." They occasionally sing the mondegreen instead of the original line live.
** Also "Come Together" by Music/TheBeatles the line "Hold you in his armchair you can feel his disease" was originaly supposed to be "Hold you in his arms yeah" but it was so commonly misheard that the [[GreatestHitsAlbum Blue Album]] had the former on its inner sleeve, and John Lennon liked the former lyric more and so all of the covers of the song has the words "his armchair".
** Also Twisted Sister´s "We´re not gonna take it" has always been "Huevos con aceite" ("Eggs with oil") in Spanish-speaking countries. Dee Snider [[http://www.youtube.com/watch?v=35PocLHx534 always sings it that way for Spanish audiences]].
* Music/{{Vocaloid}}:
** Crypton's Rin and Len Kagamine were originally supposed to be mirror personalities of each other, but fans interpreted them as twins. Crypton responded accordingly.
** Haku Yowane and Neru Akita are fan-created Vocaloids that have been acknowledged by Crypton as semi-official, to the point that they're making an appearance in Miku's game, ''Project Diva''.
* A statue of FrankZappa in Vilnius, Lithuania, basically has this [[http://www.balticsworldwide.com/news/features/zappa.htm as its backstory]].
* {{Devo}}'s "Whip It" was originally meant to be a inspirational song addressed to President UsefulNotes/JimmyCarter. Naturally, though, people thought it was an ObligatoryBondageSong or about ADateWithRosiePalms. This amused them, and they kind of enforced the first interpretation with the music video.
-->'''Jerry Casale''': "We didn't want to ruin it and tell them the truth, because they just wouldn't get off on the truth."
* After the chorus of Fall Out Boy's "This Ain't a Scene" was famously misheard as "I'm a little man, and I'm also evil, also into cats," friend of FOB member Pete Wentz and frontman of Music/CobraStarship Gabe Saporta made a Youtube video where he showed off a fake tattoo of a cat and said he got it because he was "also into cats."
* {{Music/Starflyer 59}}'s first two albums were both officially [[SelfTitledAlbum self-titled]]. Fans distinguished them by referring to them as ''Silver'' and ''Gold'' (after their respective monochromatic covers). Tooth & Nail Records made these nicknames official by rereleasing the albums with bonus tracks under the titles ''Silver: Expanded Edition'' and ''Gold: Expanded Edition''.
* After the release of PaulMcCartney's album ''Memory Almost Full'', it quickly got around that the title was an anagram: "For my soulmate LMM [his deceased wife's initials]". He responded to inquiries about it in an interview:
--> I must say, someone told me [about the anagram], and I think it's a complete mystery, because it's so complete. There does appear to be an anagram in the title. And it's a mystery. It was not intentional. But you know, I like those things, when things happen like that. It's kind of spooky. When I heard about that, I thought, "Should I just sort of say, 'I didn't know about it,'" [[TheWalrusWasPaul or should I say, 'Some things are best left as a mystery,' and smile enigmatically?" So that's tending to be my reply.]]
* Music/ElvisCostello's "Less Than Zero" was basically a TakeThat to English politician [[http://en.wikipedia.org/wiki/Oswald_Mosley Oswald Mosley]], but American listeners who'd never heard of Mosley tended to think the "Mr. Oswald" referred to in the lyrics was UsefulNotes/JohnFKennedy's assassin Lee Harvey Oswald. So when Elvis Costello first toured the US, he started playing a version with substantially rewritten verses that ''were'' in fact about Kennedy's assassination.
* On [[http://www.youtube.com/watch?v=9RjctxPWya0 March 18, 2012]], {{Music/Deadmau5}} produced the instrumental track of "The Veldt" on his live stream, posting it to Soundcloud. The next day, he found a vocal track for the song on Twitter, created by Chris James. Pensive at first, he nonetheless listened to it. He was so impressed by the track, how it completely fit the theme of the song, that he [[http://www.youtube.com/watch?v=bFjc1nOHwlc made it the official vocal track]], earning it a place on "The Veldt EP" and ">album title goes here<."
* Around 2010-2011 there were several rumors that Music/{{Drake}} and Music/NickiMinaj were dating or secretly married. They ran with this, and in Nicki Minaj's "Moment 4 Life" video, they get married. Drake also mentions it in one line of his song "Miss Me", "I love Nicki Minaj/I told her I'd admit it/I hope one day we get married just to say we fucking did it".
[[/folder]]

[[folder:Newspaper Comics]]
* ''ComicStrip/{{Dilbert}}'':
** Without meaning to, Scott Adams made Phil, Prince of Insufficient Light, look similar to Dilbert's boss. A reader asked if they were brothers, and Adams decided to indicate as much in a mini-arc.
** When Adams wrote a week-long series involving a cat character that he didn't intend to use again, he got a flood of fan emails not only wanting to see more of the cat, but all calling him "Catbert" even though Adams never named him. Adams himself said "When a group of fans spontaneously and unanimously name a character for you, it's a good idea to keep him."
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/{{Warhammer 40000}}'':
** Some of the results of the major Games Worskshop tournaments dictate canon events. This is part of the explanation behind the results of the Tyranid invasion of Macragge.
** In the Eye of Terror campaign, three Disorder players advised other players where best to attack. They called themselves the Triad. The next campaign newsletter detailed the lore of what happened, especially the GalacticConqueror... and his advisers, the "mysterious group known only as the Triad." Another fan, on the Tau Empire Third Stage Expansion front, posted messages as "Sa'Caea Sally", a human sympathizer urging the citizens of the Imperium to join the Tau. This also got a mention in the newsletter, and in the 4th Edition Codex.
** There was also one particular Order player, Canoness Astra, who had a Sisters of Battle army that coordinated the defense for one of the sectors of the war and got special mention in the game newsletters and in the summary at the end of the war.
** During a campaign the Orks were expected to try to hinder the Tau expansion. Unfortunately for the Imperium the Ork players were unhappy about being shafted like that, and instead banded together to start the 'Green Kroosade' which wound up with them sacking an Imperial Forge World. 'The Green Kroosade' was mentioned in name in official articles after the Eye of Terror.
** In the Medusa V campaign, Dark Eldar leader No'Akei (herself an AscendedExtra from a White Dwarf battle report) suffered a BolivianArmyEnding in the campaign wrap up, specifically because so many of the Dark Eldar players had wanted to betray her.
** Similarly, the Obelisks of Galahar that became central to the Craftworld Eldar objective were originally the creation of a player called Sabbad. Also, no fewer than 3 fan craftworlds (Tyriande, Vassiera, and Reia-Hal) were [[CanonImmigrant promoted to canon]] in the campaign summary.
** There are multiple (probable) [[http://1d4chan.org/images/8/8c/LCB_canon.jpg nods]] to the fanfic ''[[http://1d4chan.org/wiki/Love_Can_Bloom Love Can Bloom]]'' in one of the ''TabletopGame/DarkHeresy'' sourcebooks. Among others: LIIVI, the Vindicare Assassin, speaking a quote straight out of the ''VideoGame/DawnOfWar'' game, and one of the chapters depicts a Vindicare stalking an Eldar Farseer.
** Another fan-made character, adept [[http://1d4chan.org/wiki/The_Guy_Who_Cried_Grendel Castus Grendel]] (originally a character in somebody's Dark Heresy game who, despite having no combat skills, managed with some lucky rolls to defeat several Daemons, an Ork warboss and assorted other big nasties) is [[http://1d4chan.org/images/f/f4/FFG_Grendel.png referenced]] in one of the sourcebooks.
** [[RuleOfThree And another one:]] Fan character [[http://1d4chan.org/wiki/Boone Alice Boone]] was a low-grade psyker who was saved from the Golden Throne by her status as a governor's daughter, and was transferred into the Ordo Xenos. A [[http://1d4chan.org/images/8/86/Canonization.jpg sourcebook]] mentions a piece of Imperial folklore that follows this word for word, and features a quote on the same page from "The ''Boons'' of St. ''Alys''."
** [[http://1d4chan.org/wiki/Commissar_Dan Commissar Dan]] is apparently canonized and still ordering his soldiers to make frontline charges with ''Basilisks'' in the ''Only War'' sourcebook; though his infamous "charge, you pig-fuckers" battlecry is tragically [[CurseCutShort cut short]].
* In the ''TabletopGame/{{Warhammer}}'' Storm of Chaos campaign, the members of an Orc fansite and forum ([[http://www.da-warpath.com Da Warpath]]) were getting increasingly annoyed (and increasingly vocal) about being sidelined in the campaign background. Some members were also writing background pieces and fan rules, such as DEMOLISHER, one of the Orc Warbosses, falling off a bridge on his boar and the use of the [[AbnormalAmmo Squigcannon of Gork]]. Then some of the later campaign newsletters came out, with references to an Orc Warboss falling off a bridge on a boar and squig-firing cannon...
* Any {{Game Master}}s worth their salt under any system turn on their listening ears when their players enter a WildMassGuessing phase or burn the carefully-crafted plot down, at which point it usually overlaps with ThrowItIn. It makes the players feel smart. And if they burn down your carefully crafted plot, this is a really easy way to construct a new one: let your players do it for you!
* ''TabletopGame/{{Exalted}}'':
** In an ''accidental'' case of Ascended Fanon, it was a common fan belief that the Three Spheres Cataclysm destroyed 90% of reality; one writer confused this for canon, wrote it into "Dreams of the First Age", and has been apologising for it ever since.
** In a less accidental and more awesome example, the authors at White Wolf added "[[Webcomic/KeychainOfCreation Elegant Nova of Progression]]" to the list of canonical Alchemical Exalts when they published ''Manual of Exalted Power: Alchemicals.''
[[/folder]]

[[folder:Theme Parks]]
* The names of the Hitchhiking Ghosts at ''TheHauntedMansion'' at DisneyThemeParks (Gus, Ezra, and Phinneas) were thought up by Cast Members, and eventually became popular enough in {{fanon}} that it was semi-officially adopted.
[[/folder]]

[[folder:Toys]]
* ''Franchise/{{Bionicle}}'':
** A previously unnamed team of heroes, with mostly unnamed members, was used to explain a bizarre similarity in names. A volcano that housed the fire village and the BigBad's lair were called Mangai and Mangaia, respectively. A fan had the idea that the aforementioned team be called the Toa Mangai, Mangai meaning protector, with the volcano being named after them. Mangaia would then be an archaic version of the same word, the lair being named that before the BigBad's FaceHeelTurn. This led to many of the island's locations being retconned into the names of fallen friends of the village leaders.
** A higher-profile example is that a group called the Piraka used turrets called Nektann, and when another member of their race showed up in a story, a fan suggested "Hey, maybe the turrets were named after him?" The writer was like, "Okay", and wrote the newly-christened Nektann into a web story to make it official. A couple years later, it was promoted to the toyline when Lego made a new Piraka toy that didn't match any of the existing characters, so it was decided that it would be Nektann.
** This phenomenon has elevated to such heights that the fans have formed an official Story Squad that lets people vote for whichever new idea they would like to make canon. If the "Aye"s outweigh the "Nay"s, the proposals are taken to official story writer Greg Farshtey, who then approves them, but only if they are to his liking. As with many things, this [[BrokenBase upsets]] a number of fans, since the majority of voters also have a "Sure, why not?" attitude.
* ''Franchise/{{Transformers}}'':
** This appears to be pretty much what happened to the toyline-only ''WesternAnimation/BeastWars'' character Sonar. Due to a gender-neutral bio, it was eventually labeled female by fans, and then it appeared in the official [=BotCon=] comics, and everything else followed suit.
*** The original toy of Rhinox came with what was intended as a spinning melee weapon. However, the show retooled it into a gun, which fans dubbed the "Kickass Chaingun of Doom." When the toy was rereleased for the series' 10th anniversary, the name (minus the "kickass" part, for obvious reasons) made it onto the box art.
** Decepticons who turn into planes are referred to as Seekers. This term was possibly invented by the fandom and got adopted as the official term, but there are still questions over whether an old catalog advertisement citing them as "Decepticon Seekers" influenced the use of the term years later.
** The official ''Universe'' bio on Ratchet ascends his typical fanon interpretation as a cranky old doctor (at odds with his original G1 bio which notes that his love of partying interfered with his duties), while Wheeljack's ''Generations'' bio makes reference to his lab exploding on a regular basis--something not indicated in his original G1 bio, but a popular event in G1 fanfiction.
** In the Transformers Movie comic, a reader emailed in-character as their neutral fan-character and flirted with Barricade, asking to play 'Bad cop bad-cop-pretending-to-be-good-cop'. He flirted back. It is now pretty much canon that Barricade likes chicks.
* In ''Franchise/MastersOfTheUniverse'' the race of the pre-accident Skeletor blue elf Keldor is known as "Gar" and has been officially refrenced as such in the Classics toyline bios. This is because in the 2002 MYP Cartoon series there is an island called Anwat Gar. This is a clever play on the name of the asian city of Angor Wat. The only resident of Anwat Gar is Sy Klone, a character based on the vintage toy that happens to have a blue face. So it is reasoned by the fans that Sy Klone must be a blue elf (by virtue of his skin colour) like Keldor. And wouldn't "Gar" be an obvious name for the race, since it could be reasoned that Anwat Gar sounds kinda like it could be a foreign term for "City of Gar" or something like that? After years of common usage by fans on fansites, ect, Mattel decided "sure, why not?" This extends to the point that the modern DC comic series depicts Gar military uniforms looking almost identical to Sy-Klone's outfit.
[[/folder]]

[[folder:Video Games]]
* Sometimes developers can do this to themselves. In the Hard Rain campaign of ''VideoGame/Left4Dead2'', the players must navigate an abandoned sugar refinery. During development, Valve found that there were an unusually high number of Witches spawning in the zone. They like the glitch, and made it canon that Witches are attracted to the scent of sugar.
* Similarly, during the development of ''VideoGame/HalfLife2: Episode One'', a small joke ended up in the game due to a glitch. During a scene where the player and [[ActionGirl Alyx]] are about to be thrown over a chasm by Dog, Alyx reassures the player by saying that, as a robot, he has done the math. Then she quietly asks him if he has done the math. During playtesting, right after she had said it, Dog, as part of his idle animation, shook his head. The playtester assumed this was supposed to happen and laughed at the perceived joke, and Valve made it an intentional reaction.
* The {{DS}} originally stood for "Developer's System", as units released at that time were purely for developers to use in their production process (the intended name for the final market product being "Nintendo Nitro".) The press kept insisting it stood for "Dual Screen", so Nintendo- realising that they were already getting brand-name recognition from it- just made DS the official name.
** Another theory: the name "Developer's System" only came about because of a misinterpretation of what was said in an interview about how easy the DS was to develop for, but the internet took the quote and ran with it until suddenly it became the name many people thought DS originally stood for.
** This happened AGAIN with the Nintendo 3DS. Nintendo released a statement saying it would not be called the 3DS when it launched, but it got so much publicity as the 3DS that they released it under that name anyway.
* Although ''VideoGame/BetrayalAtKrondor'', an RPG based on ''TheRiftwarCycle'', was produced and made with Feist's blessings and under his watchful eye, the in-game texts and the story itself were in fact ''not'' written by him, as the common misconception is. Neal Hallford takes the credit for coming up with the story, which was later canonised by Feist in a {{Novelization}}.
* In the ''VideoGame/DanceCentral'' forum people started calling a user a member of DCI. Guess who you work for in [=DC3=].
* ''VideoGame/{{Touhou}}'':
** For a long time fans could never decide what AnimeChineseGirl Hong's name was, as it could be read as either Japanese (Kurenai Misuzu) or Mandarin (Hong Meiling), so they [[FanNickname decided to just call her China]]. At the same time that ZUN confirmed her name was actually Hong Meiling, he also said he calls her China as well, and the name remains popular.
** The mid-bosses of Stage 2 and Stage 4 of ''Embodiment of Scarlet Devil'' were never identified despite their unique sprites, with no dialogue, character profiles or even names, and after they became [[EnsembleDarkhorse disproportionately popular]] they were given the {{Fan Nickname}}s Daiyousei (big/great fairy) and Koakuma (little devil) respectively. ZUN then used those names himself when referring to them, though he said that they were the names of ''types'' of youkai and not those individuals specifically. This one is mostly ignored however, as the personalities he described them as possessing (impetuous, selfish and mischievous like most low-level youkai) was completely antithetical to the ones fans had devised.
** Keine being a teacher in the Human Village (and dolling out ''headbutts'' to students as punishment) started out as a fan theory.
** Utsuho's control rod was depicted as an ArmCannon almost since she first appeared. Cue ''Hisoutensoku'', where several of her attacks have her do just that.
** ''Double Dealing Character'''s stage 2 boss Sekibanki's head becomes something that seems pulled out of a fandom meme, the "Yukkuri shiteite ne!" heads.
** A running theory throughout most of the fandom was that Gensokyo ran on the opposite of ClapYourHandsIfYouBelieve, and that where there is a lack of belief in the outside world the thing or person comes to Gensokyo, a theory based on [[TheOneGuy Rinnosuke]]'s own speculations in ''Curiosities of Lotus Asia''. Nods to this theory were seen in ''Mountain of Faith'', but it didn't become canon until ''Ten Desires'', where the antagonist based her entire plan around it.
* Fans of ''VideoGame/ChronoTrigger'' still aren't sure whether the DS version's reveal that [[spoiler:[[NotSoHarmlessVillain Dalton]] was the one responsible for the Porre rebellion that [[ShrugOfGod may or may not have]] killed Crono and Marle prior to ''VideoGame/ChronoCross'']] is this, "IKnewIt," or a PromotedFanboy's [[RunningTheAsylum canonization of his preferred theory]].
* Creator/{{SNK}}:
** The final boss of ''Art of Fighting'' was dubbed "Mr. Karate" by fans, which would later be adopted as the name of Takuma Sakazaki's alternate persona.
** When ''[[VideoGame/FatalFury Real Bout Fatal Fury Special]]'' first appeared, fans dubbed the TrueFinalBoss version of Geese Howard that was found in the game as "Nightmare Geese", due to the fact that you not only fight him in a nightmarish version of his stage, but he literally IS a nightmare due to his overpowered moves and [[SNKBoss naturally aggressive AI]] to go with it. When ''VideoGame/TheKingOfFighters [[AlternateContinuity Maximum Impact 2]]'' was released, SNK adapted the moniker of Nightmare Geese to the form of Geese that appeared in that game, and the meaning of the term was changed to mean any form of Geese that is canonically dead.
* ''VideoGame/TheKingOfFighters'':
** It was speculated that, in adition of knowing Terry and Andy's dad Jeff, Takuma knew Kyo's father Saisyu. This would become canon later.
** In the early games lots of people shipped [[PsychoSoldier Athena Asamiya]] with Kyo Kusanagi, to the point that it was rumored Athena canonically crushed on him. Later, sources like the 98 and 2000 CD dramas as well as the semi-canon KOF: KYO franchise hinted that Athena held [[UnrequitedLove a passing fancy for Kyo]], but she kept it to herself since Kyo [[OfficialCouple already had a girlfriend]] named Yuki ''and'' she was a good friend of Athena too.
* ''Franchise/MortalKombat'':
** New kinds of fatalities are developed based on false rumors of their existence in earlier chapters.
** This led to the creation of the character Ermac, despite messages in the second game which Midway used to deny his existence. Meat, Blaze and Skarlet have a similar story, as does Rain, who was originally placed in the ''[=UMK3=]'' attract mode as a RedHerring.
** The common untrue rumor that there was a Stage Fatality that let you feed your opponent to the demonic trees in the Living Forest led to the developers actually making it a real Stage Fatality in ''[=MK9=]''.
** The revelation of Noob Saibot being [[spoiler:the specter form of the original Sub-Zero from ''[=MK1=]'']] was the result of a Midway employee [[http://highervoltage.net/mb/showpost.php?p=400646&postcount=12 taking suggestions from a fan]].
* ''VideoGame/DragonQuest'':
** Yūji Horii [[WordOfGod explained]] that the "Zenithia" trilogy (games [[VideoGame/DragonQuestIV 4]], [[VideoGame/DragonQuestV 5]], and [[VideoGame/DragonQuestVI 6]]) was never intended: "Each Dragon Quest title represents a fresh start and a new story, so I don't see too much of a connection between the games in the series. I guess it could be said that the imagination of players has brought the titles together in a certain fashion." Judging by some of the commentary and bookshelves in the DS VideoGameRemake, they've gone "Why not?"
** The [[VideoGame/DragonQuestI first game's]] villain, the Dragonlord, goes down pretty quickly in the Japanese version, but then his [[DragonTheirFeet pet Superdragon attacks you.]] The western translation had him turning into this [[OneWingedAngel final form.]] Later depictions in ''VideoGame/DragonQuestMonsters'' and ''VideoGame/DragonQuestIX'' have this be the Dragonlord's true form.
** In an inverse "developers doing it to themselves" crossed with PAL Bonus and some pseudo-RecursiveImport, the English localizations of the games tend to have this effect on the later Japanese rereleases. Much like the Dragonlord example, games that come West get a graphics/sprite overhaul that is usually ported back to Japanese rereleases, with a very specific case of this being ''VideoGame/DragonQuestIII'' giving Ortega a proper sprite and a proper opening sequence.
* ''VideoGame/TeamFortress2'':
** Fans suspected every major class update of being the Spy update since Goldrush, on the assumption that Valve would "disguise" it as another class's update (since, after all, that's exactly what the Spy does). [[http://www.teamfortress.com/sniper_vs_spy/day04_english.htm That's exactly what they ended up doing]]. To the Sniper, the backstab target. He then hijacks it back, ''[[http://www.teamfortress.com/sniper_vs_spy/day07_english.htm by throwing a jar of piss on the Spy.]]''
** The Soldier/Demoman update [[http://www.teamfortress.com/war/administrator/ included a brief comic]] that revealed several things about the Announcer. First, judging by the page [=URLs=], she's really called the Administrator; second, as fans have long suspected, she serves as announcer for ''both'' teams; third, she controls access to the players' unlockable weapons; and fourth, she looks almost exactly like the best-known fan art of her (Valve actually got the original artist's permission to use the character).
** Pretty much Valve's official policy for ''[=TF2=]''. Several of the unlockable items come from fan ideas (Bonk! and the Equalizer to name two) and there have been several nods to fan works ([[http://fav.me/d1pbaup this fan-art of the Announcer]] is now almost canon, simply replace the jacket with a purple one. Also the Sniper's campervan features a bumper sticker mentioning the [[http://img177.imageshack.us/img177/9610/1203136793294oq7.gif Swordvan]]). There is now even [[http://www.teamfortress.com/contribute a page on the TF website to contribute your own unlockable items]].
** The day before the Sniper/Spy update was released, a user on the Steam Forums posted on how they hoped that the Pyro could light the Sniper's arrows. Valve rushed to add this to the update.
** In the 2012 Halloween event, the boss Merasmus will sometimes will sometimes disguise himself as a random prop, similarly to the Prop Hunt game mod.
* ''Franchise/{{Pokemon}}'':
** The long used fan term "Eeveelution" (for the many different evolved forms of Eevee) appears in the second ''VideoGame/PokemonRanger'' title. While a previous use existed in the TCG (as a deck name), it was the first "in universe" use.
** Nintendo [[http://www.pokemonvgc.com/en/shiny-eevee.php started using the term "Shiny"]] to refer to Pokémon with alternate color schemes.
** Luvdisc's uselessness has been acknowledged in X & Y as it is one of only two Pokémon that can be caught with the Old Rod. The other being Magikarp.
** The pronunciation of the name "Pokémon" was originally said as "Pock-ay-mon" in the anime, but the theme tune said "Poke-ay-mon". The usual fan pronounciation is either "Poke-ay-mon" or "Poke-uh-mon", and these are so widespread that Nintendo accepted them as correct.
* [[http://www.1up.com/do/previewPage?pager.offset=2&cId=3145765&p= The story behind the abbreviation for Blue Mage]] in ''VideoGame/FinalFantasyXI'' is as follows:
-->'''1up.com''': First, what is the abbreviation of the Blue Mages -- will it be "BLU?"\\
'''Hiromichi Tanaka''': Thanks, the check's in the mail. We're going to borrow your abbreviation. We didn't have one yet. [laughs]
* Kamek, the Magikoopa master from ''Franchise/SuperMarioBros'', has been retroactively established as being in some of the games that featured a Magikoopa since his first appearance in ''Super Mario World 2: Yoshi's Island''. ''Yoshi's Safari'' featured an unnamed Magikoopa as a boss; now he's Kamek's first official appearance. Some appearances by a singular Magikoopa have also been considered Kamek appearances: the Magikoopa who teaches Bowser how to use his abilities and cares for the injured Koopa King in ''Bowser's Inside Story''; the Magikoopa who blasted Mario away from Peach's Castle in ''VideoGame/SuperMarioGalaxy'' ([[http://www.mariowiki.com/images/9/9b/KamekTradingCard.PNG confirmed by an official trading card]]); the Magikoopa who was going to be in ''VideoGame/MarioKart64'' but was replaced by Donkey Kong; and a Magikoopa who informed Kammy Koopa of Peach's abduction in ''VideoGame/PaperMarioTheThousandYearDoor''. The Magikoopa the party fights in Bowser's Keep in ''VideoGame/SuperMarioRPG'' was intended to be Kamek, which is made more clear by his Japanese Psychopath message, which reads "The baby from that time!?" (He's called Kamezard in the Japanese version of the game.)
* Whether or not it was intended, some fans of ''VideoGame/SuperRobotWars'' believe someone in Banpresto pitched an idea to the staff to compile all their in-house OriginalGeneration characters, HumongousMecha and storylines from previous games into a new sub-series for the franchise, rather than go with formula and pay the licensing fees for ''Franchise/{{Gundam}}'', ''MazingerZ'' and ''GetterRobo'' for another crossover like the last game. Sure enough, ''VideoGame/SuperRobotWarsOriginalGeneration'' was the result, expanding into two titles for the GameBoyAdvance, a VideoGameRemake for the PlayStation2 (with a follow-up sequel), various manga, two {{animated adaptation}}s, tons of model kits and three {{Gaiden Game}}s spun off of this new sub-series.
* ''VideoGame/WorldOfWarcraft'':
** Several Abomination units have a Scourge Hook ability, that allows them to reel enemies in with their hooks. Abominations in ''Warcraft 3'' did have hooks, but the ability to pull enemies in was originally an ability for an Abomination hero in the popular custom map ''VideoGame/DefenseOfTheAncients''.
** Chris Metzen confirmed in a [=WoW=] Magazine interview that Bolvar being alive and his expanded role to that of [[spoiler:the Lich King]] was due to the forum speculation about him. However, it is likely that Alexstrasza was referring to a different plan for the character, as Arthas was shown retreating through the wrathgate [[PlotHole without Bolvar's corpse, leaving it outside where anyone else who could have taken the corpse was killed]].
* At the beginning of the ''VideoGame/BackyardSports'' series, Pablo was just a normal (though often [[GameBreaker overpowered]]) character. When the programmers found out about his MemeticBadass status, they put a ''huge stained glass window'' of him in ''Backyard Skateboarding''.
* Occasionally, on the ''VideoGame/BillyVsSNAKEMAN'' forums, someone speculates/jokes about some part of the game world and the game's creator responds "hahaha, that's awesome, and it is now true." ([[http://www.animecubed.com/billy/forum/viewtopic.php?p=119779&sid=d2666fbaf2f2fda12f55d2517424dcfa#p119779 Actual quote of one of those times]])
* On The Consumer's edition Soundrack of ''VideoGame/BlazBlueContinuumShift'', you'll find the [[http://www.youtube.com/watch?v=C9E3DZaoeus Vocal Version]] of [[RatedMForManly Bang]] [[ThemeMusicPowerUp Shi]][[HotBlooded shi]][[Creator/TonyOliver ga]][[EnsembleDarkhorse mi's]] Theme, Gale, as sung by the Japanese man who voices Bang himself. It was originally [[http://www.youtube.com/watch?v=dweaPjeQhYQ Fan Made]] by the same guy who did [[EarWorm Okkusenman]].
* ''Franchise/SonicTheHedgehog'':
** Rumor has it that [[MsFanservice Rouge the Bat]] from ''VideoGame/SonicAdventure2'' was originally created by a fan. A female fan, nonetheless.
** The fan use of the name [[VideoGame/SonicUnleashed Werehog]] was so commonplace in both the English and Japanese fandom, that SEGA made it its official name (similarly, [=WereSonic=] was used to describe the character in the Wii/[=PS2=] version on several occasions).
** ''VideoGame/SonicLostWorld'' bears a pretty strong, but coincidental, look to the canceled ''Sonic Xtreme''. Sega of Japan seems to be dismissing these comparisons, but Sega of America seems to welcome them.
* Bob the Snail from ''MapleStory''. For unknown reasons a single level 1 snail, the weakest enemy in the game, would randomly spawn in Drake's Meal Table, a high-level map, right along side level 50+ drakes and other powerful monsters. Fans named the snail Bob and came up with various lore including that he is older than Grendel the Really Old, and that he is actually a hero who protects the world from the drakes. Many of these theories have been stated to be completely true and Bob is now an official boss enemy. Unfortunately, hero or not you still have to kill him for a number of quests.
* In the ''StreetFighter'' series, Guile's military buddy and mentor was originally known by two names: "Nash" in the Japanese versions and "Charlie" in the overseas releases. [[{{Fanon}} Many fans]] however, liked to render his full name as Charlie Nash (most likely influenced by the live-action ''Film/StreetFighter'' film, where Charlie and Blanka were combined into one character named Carlos "Charlie" Blanka), a full name which was even adapted into UDON's comic adaptation. In ''VideoGame/StreetFighterIV'', the designers apparently decided to just go with this as Guile can be seen looking at a dog tag that reads "Charlie Nash" (which was likely done to avoid drawing two different versions of the same scene).
* ''Videogame/{{Tekken}} Tag Tournament 2'' allows Jun to transform into Unknown, confirming fan theories that they are the same person. This only applies in the Tag universe as they have a separate continuity from the main series.
* ''Franchise/MassEffect'':
** Despite Creator/BioWare's initial fears, Tali'Zorah and Garrus' popularity exploded and fans demanded they become romance options, which became a reality in ''VideoGame/MassEffect2''.
** Due to both Mark Meer and Jennifer Hale being Canadian, this lead to a popular theory among fans that Commander Shepard is of Canadian descent. Bioware seemingly confirmed this with a FandomNod in the third game, where if [=FemShep=] decides to romance Samantha Traynor, one conversation has Shepard defend ''Vancouver'' as being just as romantic as Paris or Tokyo.
** A few months after ''VideoGame/MassEffect3'' came out, someone made a slide of cocktails named after and inspired by the different squadmates. In the ''Citadel'' DLC, Traynor makes them at a party.
** The fans felt that Kaidan had a lot of HoYay with a male Shepard, although it's unclear whether they were deliberately planning on making him romanceable and cut that content or if it was just an artifact of Bioware's recording process. Cut to ''3'' and Kaidan becomes an acceptable romantic partner for both male and female Shepards.
* In the manual for ''VideoGame/WingCommander Arena'', many of the fighter designations are lifted from those given to craft that previously had no alphanumerical designation, in fan mods.
* Wild rumors spread, for no apparent reason, of a Secret Cow Level in ''VideoGame/{{Diablo}}''. There wasn't one. Blizzard, taking it all in good fun, made "thereisnocowlevel" a cheat code in ''VideoGame/{{Starcraft}}''... and then put a Secret Cow Level in ''VideoGame/DiabloII''.
* In ''VideoGame/HarvestMoon'' several names are considered fanon, and most have been not used officially. However, two typical fanon names for the male protagonist are Jack and Pete; Jack became the official name of the protagonist for Save the Homeland and Hero of Leaf Valley games. In a spin-off example, the series ''Puzzle De Harvest Moon'' refers to the previously unnamed male protagonist(s) from the original through GBC 2 series as Pete (the names weren't official until GBC 3 and on up).
* ''Franchise/MetalGear'':
** The parody fan game ''VideoGame/MerryGearSolid 2'' made a joke that Snake still believed in Santa Claus. In ''VideoGame/MetalGearSolidPeaceWalker'', it's revealed that Snake still believes in Santa Claus. There's no indication from HideoKojima as to whether or not he's played ''Merry Gear Solid'', but considering he confesses to looking at fanart and following cosplayers of his own series, it's not too much of a stretch.
** Hideo Kojima has [[{{Twitter}} tweeted]], repeatedly, on the topic of [[HoYay Solid Snake/Gray Fox]], referring to Snake as "''Frank no ai''/Frank's love" ([[BuryYourGays translated as "lovely" for the English twitter feed]]) and also calling Frank a 'pervy masochist' who wants to get beaten up by him out of love. This was certainly SubText in the original game, but seeing it confirmed so readily was unprecedented.
** When ''VideoGame/MetalGearSolid3SnakeEater'' came out, fans suggested that the area it's set in, Tselinoyarsk, might have become the Zanzibar Land fortress of ''VideoGame/{{Metal Gear 2|SolidSnake}}'' due to its [[{{Ruritania}} similar proximity]], and reasonably similar geography. This was eventually confirmed in the ''VideoGame/{{Metal Gear Solid 4|GunsOfThePatriots}}'' novelisation.
* The in-universe explanation for how the "Girl Power" system works in ArTonelico2 was a fan-theory that gained approval from series' creator Akira Tsuchiya.
* ''VisualNovel/UminekoNoNakuKoroNi'' Episode 5: [[ItMakesSenseInContext Due to the events of the story,]] fans started depicting Battler wearing a cape similar to Kinzo's. When Episode 6 rolled around, the creator made the fan design official.
* In ''VideoGame/CaveStory'', it's stated once that the player character's hat has something written on it, but what this writing says is never revealed. When concept art of the [[WhatCouldHaveBeen beta version]] was released, fans noted that the protagonist's hat said "Curly Brace"--which was the character's name at that point in development. While, in the finished game the protagonist's name is something different--and Curly Brace is instead the name of an important GuestStarPartyMember--fans insisted that his hat still said "Curly Brace" in the finished game. Daisuke Amaya eventually gave his blessing to that particular theory.
* Roleplayers in ''EveOnline'', having noticed that Caldari names looked like a cross between Finnish and Japanese, created a [[ConLang Caldari language]] inspired by these two languages (and the few words already mentioned in official sources). The Arek'Jaalan event, whose main character -- played by an actor from CCP's staff -- is a Caldari scientist who defected to a Minmatar corporation, is named after said character's ship -- which means "to make dissidents" in the Lonetrek dialect, also invented by players. Other roleplayer fanon to dribble into official articles or events includes discontent among the Intaki (a founding Gallente [[TheFederation Federation]] member) over cultural assimilation and poor security in their home region with nods to player-originated "Intaki Seperatist" movements.
* Fans of ''Franchise/{{Halo}}'' compiled info on the series in a ''Halo'' [[http://www.halopedian.com/Main_Page wiki]] online. While wikis are good, they're not perfect. When the official ''Halo Encyclopedia'' was released, it was clear that it had copied material directly from the wiki because it duplicated some of its errors and flawed ways of presenting information. As the ''Encyclopedia'' is supposed to be canon, the errors are errors no longer. Several bits of fanon that had snuck into the pages, such a faction called "the United Rebel Front", or clear errors like the fleet at Reach being 750 ships instead of 314 and there being a First and Second Battle of Earth, were discarded later on the wiki despite being in the ''Encyclopedia'' because they were recognized as mistakes.
* In ''VideoGame/KirbysReturnToDreamLand'', one of Kirby's friends is a [[EnsembleDarkhorse Waddle Dee with a blue bandana]]. That Waddle Dee is the same from ''VideoGame/KirbySuperStar'', and he returned as a [[JavelinThrower playable character]], but his name was still "Waddle Dee" just like a [[{{Mooks}} normal enemy]]. That caused some confusions so many players [[FanNickname started calling him Bandana Waddle Dee]] (or Bandana Dee for shorts). The fan name got so popular that they officially changed his name to "Bandana Waddle Dee" for ''VideoGame/KirbyTripleDeluxe''.
* ''VideoGame/{{Fallout}}'':
** Several gameplay-expanding functions in ''VideoGame/FalloutNewVegas'', such as the weapon modifications (which allow you to fit certain weapons with scopes, sights and expanded magazines), were directly adapted from fanmade game modules for ''VideoGame/{{Fallout 3}}''. Interestingly, while the NV modifications only worked for a few of the weapons, the original designer went on to make ''another'' module for NV that provided a full three improvements for ''every weapon in the game''. Including the [=DLCs=] and some more popular modules.
** The Scorched Sierra Power Armor first appeared in a PC mod, before the developers officially added it in the ''Lonesome Road'' DLC.
** ''VideoGame/{{Fallout 3}}''[='=]s Keychain likely drew inspiration from ''[[VideoGame/TheElderscrollsIVOblivion Oblivion]]''[='=]s Keychain mod, which changed miscellaneous items being all in one place to grouping all the keys together.
** The .223 pistol in ''VideoGame/{{Fallout 1}}'' and ''2'' was nicknamed "That Gun" by fans. ''VideoGame/FalloutNewVegas'' has a unique 5.56mm pistol also named That Gun.
** A mod added the dialogue option "Two Bears High-Fiving" for the last image in Doc Mitchell's InkblotTest. The ''Honest Hearts'' DLC has a tribal named Two Bears High-Fiving as a Wild Wasteland encounter.
** ''Gun Runners Arsenal'' adds the [[WebVideo/FalloutNukaBreak Nuka Breaker]] rebar club.
* ''{{Minecraft}}'' had beta 1.8 leaked to the public early by mistake. Instead of trying to rectify the problem, Mojang decided to have pre-release versions of the next update revealed to the public from now on in the form of "snapshots". The results were twofold: players can get a sneak peek at new features and bug fixes while Mojang gets feedback from the players about the snapshot so they can fix whatever bugs there are before making the snapshot official.
* ''VideoGame/{{beatmania}}'':
** ''beatmania IIDX'' was originally titled "''beatmania II''", with a significantly more extravagant "deluxe" version of the arcade cabinet labeled "''beatmania II DX''". The DX cabinets were much more popular, to the point that Konami gave up on producing the non-DX cabinets. Combine that with the way the "II" and "DX" were close together on the logo, and everybody started calling the game "beatmania IIDX". It has since become the official name for the series.
** The Sudden+ option. Initially, some players would drape a towel over the screen to cover part of the note lanes, in order to force themselves to focus on only the most imminent notes. (There was already a "Sudden" option, which would cause notes to be invisible until about halfway down the screen, but it wasn't adjustable whereas a towel was.) This led to the introduction of Sudden+, which puts a static "Lane Cover" image on the screen covering just the top portion of the lane, and each player can individually adjust how much of the lane it covers. The image itself is also selectable from a few dozen options, most of which are based on songs in the game, but as of ''IIDX 19: Lincle'', one of them is a towel.
* Prior to the English release of ''VideoGame/Disgaea4APromiseUnforgotten'', fans had given Fenrich the nickname "Fenfen." So what happens when the game is brought over?
-->'''Fuka:''' Yeah right. I bet you just want a nickname too. Okay then, I'll call you Fenfen.
* ''VideoGame/DanceDanceRevolution'':
** Delta Max from ''Dance Dance Revolution Universe 3'' was originally a fan remix for ''VideoGame/{{Stepmania}}''; after the author won a contest to get one of his song's in Ultimix 2, he was able to get more songs into DDR and one into ''VideoGame/{{Beatmania}} [=IIDX=]''.
** The boss song for ''DDR Extreme'' was originally rumored to be a 400 BPM song titled "Max To the [=XXXimum=]". There was a Stepmania fan remix with this title using sped-up segments from "Max 300", "Legend of MAX", and "Max Resurrexxion", another fan remix. Then came ''DDR Supernova'' with an official 400 BPM boss song titled "Fascination MAXX".
* ''{{Myst}}'' was rumored to have a fifth age accessible in its PlayableEpilogue. In the ''realMyst'' remake, the fifth age (Rime) became reality.
* The final level of ''{{VideoGame/Marathon}} Infinity'', Aye Mak Sicur, was based on a third-party multiplayer map titled The Pfhactory by Randy Reddig, who [[PromotedFanboy joined the development team]].
* ''[[VideoGame/{{X}} X3: Terran Conflict]]'' and ''X3: Albion Prelude'' both have content that originated in fan mods for the previous game, as [[AscendedFanboy many modders have been hired by EGOSOFT]]. Many of the (non-missile) frigates, [[MegaCorp OTAS]] ships, [[EliteArmy AGI Task Force]] ships, and the [[BoardingParty ship boarding system]] featured in ''[=X3TC=]'' originated in the ''Xtended'' mod for ''X3: Reunion'', albeit less polished. In ''X3: Albion Prelude'', most of the new ship content originated in the ''Xtended Terran Conflict'' mod - the TP+ Yacht ship class, Frigate-class carriers, and TS+ Heavy Transporters. EGOSOFT also wanted to use the new race-unique station sets[[note]]In the base game, all of the Commonwealth races use the Argon station set for their factories; only the Terrans have their own (complete) station set[[/note]] featured in ''Xtended TC'', but were politely turned down as it would have made the mod largely redundant. The 3.0 content update for ''Albion Prelude'' was made almost entirely by fan modders, and was released as an official update.
* While ''VideoGame/{{Borderlands}}'' was in development, the Siren Lilith looked radically different from her final character design. After she was given a full makeover, her previous appearance- including the signature Siren tattoos- were given to an antagonist, Commandant Steele. Fanon insisted that Steele was a Siren as well, and Gearbox ultimately agreed. [[spoiler:Not that it mattered much by the final boss.]]
* The Commodore 64 version of ''Jet Set Wily 2'' was not only a way better version than the original on the ZX Spectrum, it also contained an island which you could visit at a certain time period. The creator of the port said that he added it due to ongoing rumours of the fanbase about its possible existence.
* ''WorldsOfPower'' were a series of novelizations of several classic NES games, which usually took some fairly extensive liberties with the original plots. As such, most of the books are completely ignored by the actual video game continuities (i.e. ''Franchise/MetalGear'', ''Franchise/{{Castlevania}}'', ''VideoGame/NinjaGaiden'', etc.). However some of the elements from the novel of ''VideoGame/BlasterMaster'' were incorporated in the PS1 sequel, ''Blasting Again'', making it the only ''Worlds of Power'' novelization to be considered canon.
* In the first of the ''VideoGame/BaldursGate'' trilogy, it was common practice for players to dual-class Imoen, a female human thief, into being a thief/mage, since she qualified for it and it was actually a pretty good choice. In the second game, Imoen's class was officially changed to dual-classed thief/mage.
* The final version of ''Jinsei Owata no Daibouken'' has a crossover with ''IWannaBeTheGuy'' for its last stage.
[[/folder]]

[[folder:Web Comics]]
* ''Webcomic/PennyArcade's'' Gabe and Tycho are commonly confused for actual [[AuthorAvatar avatars]] of its two designers, fueling a common joke that artists will never draw characters who actually look like them. Both real life creators mention this was never their intention; very early strips even give the characters different names, and in podcasts they talk about them as distinct people. Eventually they got tired of correcting people and decided to roll with it, incorporating more of their personalities into the characters, though at this point any real similarities are TheArtifact. Mike got the same VideoGame/{{Pac-Man}} tattoo Gabe had, because the fans always asked to see it, and also [[http://penny-arcade.com/comic/2012/04/02 caricatured both of them]] for the sake of an iPad 3 resolution joke.
* ''Webcomic/TheOrderOfTheStick'':
** Many fans claim that the author originally intended Vaarsuvius to have a specific gender, but [[{{Jerkass}} deliberately made it]] [[AmbiguousGender ambiguous]] after a few fans started bickering about V's gender early on. The author confirmed this in the first compilation book.
** At least [[http://www.giantitp.com/forums/showthread.php?t=304076 at one point]], Rich invoked this trope to cut off rampant speculation (with the implication of, "I didn't elaborate on this more than was necessary for the story, so this is as good as any explanation"):
-->'''[=MReav=]''': I assumed the strong winds were magical in nature, and when the pyramid blew up, it rendered the magic that generated them useless.
-->'''The Giant''': Sure.
-->'''[=MReav=]''': Is that the sure of "That's exactly how I planned it" or "That's exactly how I planned it and that's the story I'm sticking with!" ;)
-->'''jhunter_d''': That's the sure of "[[AWizardDidIt A wizard did it]]. There."
* ''Webcomic/BobAndGeorge'':
** VideoGame/MegaManClassic's CrouchingMoronHiddenBadass behavior was originally just [[RuleOfFunny an unexplained joke]]. Then some continuity-minded fans noticed that [[http://www.bobandgeorge.com/archives/index.php?date=000802&commentary=on an earlier strip]] gave a surprisingly plausible reason for this behavior, and Dave Anez ran with it.
** A less important detail, mentioned [[http://www.bobandgeorge.com/archives/index.php?date=011211&commentary=on here]], was that Bob's scarf was burned and tattered, due to his suit being a scorched Proto Man costume.
* ''Webcomic/DarthsAndDroids'' has this happens pretty consistently over the run of the series, especially where Sally is concerned. As another player's little sister (and being much younger than the rest of the group), nobody really wants to squash her creativity so they let her do some world-building -- for example, the entire Gungan race, their bubble-city home, and the two-headed podrace announcer. Generally, if something just plain weird happened in the movies, it's probably Sally's idea in D&D. [[http://www.darthsanddroids.net/episodes/0076.html This page]] shows where the [[DoingInTheWizard midi-chlorians]] came from, and [[http://www.darthsanddroids.net/episodes/0491.html then it's Jim's turn.]]
* ''{{Terinu}}'s'' author, Peta Hewitt, borrowed the title of the "Department of Social Harmony" the {{Doublespeak}} name for the Varn Dominion's secret police/propaganda division, from a reader's fanfic, along with the idea that the Earth was beaten using a giant tractor/pressor beam to induce earthquakes and tsunamis.
* ''TheWotch'': Compare the [[http://www.thewotch.com/?epDate=2005-07-08 first]] canon appearance of the character Anibelle with [[http://www.thewotch.com/?epDate=2008-08-12 the second]]. Now consider [[http://www.thewotch.com/?epDate=2005-06-10 this non-canon filler done by a guest artist]] in between those two appearances. Yeah, exactly.
* Among the many submitted {{fanfic}}s posted on the website of ''TheClassMenagerie'' by the comic's creator, there was one where character Mike Hopkins (a kangaroo) is revealed to be gay, pairs up with a wolf boyfriend and comes out. This became canon in the penultimate story arc before the comic finished: Mike, previously undeclared, admits that he is gay, and the arc ends with him running into a hunky wolf in circumstances identical to those in the {{fanfic}}.
* ''WebComic/GirlGenius'':
** Author Phil Foglio gave the response "sure, why not?" to a question about whether [[http://twitter.com/Othar Othar's Twitter]] was canonical.
** The use of a ShowWithinAShow allows for this to be combined with SureLetsGoWithThat in this [[http://www.girlgeniusonline.com/comic.php?date=20030903 strip]].
** During a [[http://www.reddit.com/r/IAmA/comments/1fcxje/we_are_kaja_and_phil_foglio_creators_of_girl/ca92630 Reddit Ask-Me-Anything session]], Phil canonised a suggestion conflating [[http://www.girlgeniusonline.com/comic.php?date=20080206 an amusing operatic-staging reference]] with the Castle Heterodyne-generated [[http://www.girlgeniusonline.com/comic.php?date=20130225 mechanical thorn wall]] - 'It is now.'
* ''Webcomic/{{Homestuck}}'':
** "Mutie", a FanNickname given to the mutant kitten Rose found, became the ''actual'' nickname that Rose later gave it (short for "[[ItMakesSenseInContext Vodka Mutini]]".)
** Most of Grandpa Harley's [[KitschCollection collections]], the [[EveryoneCallsHimBarkeep Peregrine Mendicant's]] [[SamusIsAGirl gender]], [[TimeMaster Lord English]] being an ''Franchise/{{Ultima}}'' ShoutOut and Dave being a redhead (the characters are drawn with black-and-white heads, even though their backgrounds and outfits are in color) were all fandom ideas originally. Hussie changed his mind on that last one, having said that logically Dave and Rose should have the same hair color. Since most fans don't agree with Rose being a redhead, they eventually mostly decided on either blonde or just blank white hair. Sometimes Dave gets strawberry blonde hair as a compromise.
** The name of [[NoNameGiven Tavros's Lusus]] was confirmed to be "Tinkerbull", the FanNickname it had had all along, and the species of Karkat's Lusus in the [[spoiler:post-Scratch universe]] is referred to as "crabdad", another FanNickname.
** The canonisation of [[DryDockedShip Gamzee having red feelings for Tavros]], a HoYay FanPreferredCouple based on a single interaction. [[note]]Admittedly, that interaction ''was'' Gamzee suggesting to Tavros that they make out, but still...[[/note]]
** After the mysterious villain Lord English was finally revealed, someone made [[http://ib.skaia.net/post/view/22819 fanart of him]] in the style of a classic monster movie poster. Then [[spoiler:Jake English]] was introduced, and the walls of his room were completely covered in movie posters--and that Lord English fanart was one of the posters.
** On [[http://mspandrew.tumblr.com/post/12680094125/answers his tumblr]], Andrew Hussie (facetiously, we hope) declared that all fantrolls, ever, are now canon.
--->'''Q:''' Will another 12 alternate trolls be introduced? \\
'''AH:''' ... How about if I introduce 10,000 new trolls? Watch this.\\
I hereby declare all of your fantrolls to be canon.\\
Yes, even the shitty ones.
*** He since introduced a fan troll - [[StealthPun a troll that]] [[AscendedFanboy is a fan of the characters and setting]]. He has also introduced more trolls, some of which are parodies of [[{{Flanderization}} how the original trolls are written in fanfiction]] (basically another kind of fantroll). [[spoiler:Then the first fan troll turned out to not be a troll at all.]]
** [[http://www.mspaforums.com/showthread.php?31279-Spades-Slick-Chat-XXXVII-Tesseract-confirmed-for-best-poster&p=4016193&viewfull=1#post4016193 On this post in the forum]], Hussie suggested that the Troll Empress could have survived the Vast Glub. The very next post in response? "In before she's recruited by Lord English as well." About a year later, that's exactly what happened. It's even funnier when a later post on that page discusses this trope.
** While Hussie is very fond of taking interesting fan theories and canonising them, he is still a TrollingCreator, and just because a theory becomes canon that doesn't mean it's going to happen in a way anyone expects. Case in point: UU. By Act 6 Act 3, the theory that [[spoiler:she wasn't actually a troll but just someone cosplaying was quite widespread, and no-one was too surprised when it became canon. What ''was'' surprising was the fact that she was revealed to not be a human, either, but a ''completely different species that was not revealed until that update''.]] Well played, Hussie.
** The many sprites in the Ministrife were drawn by a fan with apparently pretty broad discretion, and so they included a number of nods to the fandom, particularly the canonisation of the popular fanon that, under his helmet, Mituna has dandelion hair - thick, MessyHair that [[BlindingBangs covers his eyes]].
** The popular fan adventure ''Fanfic/{{Promstuck}}'' contains a gag where Vriska shows John a spiral notebook containing her drawings, which she has [[http://blingee.com/ Blingeed]]. John wonders how she was able to Blingee a spiral notebook. Much later on, in ''Homestuck'', there is a scene where the Condesce gives Roxy a binder which is covered with gaudy animated gifs (some of them of the [[Music/InsaneClownPosse ICP]]), and Roxy wonders how she was 'able to get the clowns to dance'.
* ''Webcomic/{{Freefall}}'' has [[http://freefall.purrsia.com/ff1500/fc01441.htm Nickel's new legs]].
** When someone asked Mark Stanley what the FTL drive in his 'verse as called, he said "Dave." A fan suggested that this was a tongue-in-cheek acronym for "'''D'''angerous '''a'''nd '''V'''ery '''E'''xpensive", and Mark promptly declared it canon.
** Mark also included a ShoutOut to a popular ''Freefall'' fanfic. The fic featured another Bowman's wolf, Donna Morris, working as a hospital volunteer and hoping to become a nurse; Donna's name and occupation were made canon in a casual remark by [[spoiler:Doctor Bowman]].
* In [[http://www.egscomics.com/?date=2010-02-02 one of the Q&A strips]] of ''Webcomic/ElGoonishShive'', the author acknowledges [[http://elgoonishshive.wikia.com/wiki/El_Goonish_Shive_Timeline a fan-made timeline]] for the series and declares in the commentary that he considers it canon.
* In one battle scene of ''Webcomic/{{Goblins}}'', there was one goblin (who was somewhat fatter than the others) the fans named "Joe Chubbs", and started writing legends of him. While the author usually doesn't let himself be influenced by the fans, he decided to draw that goblin in other scenes, one of them featuring him as the only character for a few panels.
* A similar thing happens in ''Webcomic/LookingForGroup'', where a small girl zombie featured in a few strips gained a fandom and name of "Kalima", after the Kali god. When questioned on this at a convention, the artist Lar said (paraphrased) "Well, I guess if that many people say it, it must be true."
* [[WalkyVerse David Willis]] has taken to saying this on his [[http://www.formspring.me/shortpacked Formspring page]] in response to frivolous questions such as "In DOA, will Ruth be breaking anybody in half?", "Does Dina read Webcomic/DinosaurComics?", and "[[LampshadeHanging Could you stop answering so many questions "Sure, why not?"]]"
* The city in ''.Memoria'' was introduced by having one of the guards assume that Nyroti's EasyAmnesia was because he was ''really wasted'' the night before and telling him "welcome to the Afterparty" as we get a view of the city for the first time. Naturally, the fans unanimously decided that "Afterparty" was the name of the city. [[CaptainObvious It stuck]].
* ''Webcomic/RustyAndCo'':
** In the 4th [[IdiosyncraticEpisodeNaming level]], a fan dubbed the recently-introduced female elf band the [[DixieChicks "Pixie Chicks"]]. The author, Mike, liked it so much he decided to "roll with it" and make it their official name. Check the comments section [[http://rustyandco.com/comic/level-4-7/ here]].
** Fans refering to "Yuan-Tiffany" gave the yuan-ti her name.
* ''Webcomic/CucumberQuest'' has [[http://gigidigi.tumblr.com/post/8795618268/questions-if-you-have-a-question-please-check Almond being ambidextrous]].
* The WildWest themed robot bounty hunter chasing ''Webcomic/BladeBunny'' was given the FanNickname of the Chrome Cowboy. Some time later the author admitted they'd GotMeDoingIt and the name was accepted as being as good as any. Made fully canonical in the title of [[http://www.bladebunny.com/comic/chrome-cowboy-page-1/ his backstory]].
* In the case of ''Webcomic/TheDragonDoctors'', this happened ''on TVTropes'' (including a link to this page, natch). A fan theory was posted on [[WMG/TheDragonDoctors the comic's Wild Mass Guessing page]] about the delay between [[spoiler:Tanica tearing out her life force]] and her beginning to [[spoiler:wither and die]] in Chapter 13 -- that she was [[spoiler:being kept alive by the seed's life force]] -- to which the author replied:[[note]]Spoilertags not in original.[[/note]]
-->'''Speedball:''' Sure, why not? It all makes sense to me, and I did mention how [[spoiler:the seed's life force had merged with Tanica's]]. I was more going for RuleOfDrama on the timing for [[spoiler:when she started visibly rotting]], but this works too.
[[/folder]]

[[folder:Web Original]]
* Because ''Roleplay/RubyQuest'' was an interactive story on an {{imageboard}}, anybody could post anything in the thread. The author, Weaver, tooks several bizzare suggestions seriously, including putting a severed hand up a pneumatic tube - "there it goes..." and blending several other body parts into a GODAWFUL SMOOTHIE. [[spoiler:(This last may be what pushed Red over the edge.)]] Besides the inevitable trolls, there were quite a few pieces of original fanart. The author included several visual items, including a [[spoiler:sort of trident spear tied to a longer handle broken off something else, carried by Ace, as well as the visual design of the mutated doctor Filbert]].
* ''GaiaOnline'' introduced a pair of RichBitch twins named the Von Helson Sisters to serve as rivals for the resident Megalomaniac during a storyline in 2005. Fans speculated that since the name "Von Helson" sounded a lot like "Van Helsing", coupled with the fact that the twins had an apparently dead father named ''Vladmir'', about half the website jumped to the conclusion that they were actually Vampires. In 2007, Gaia rolled with this and used it both as an opportunity to fill in numerous {{plot hole}}s, and a chance to play off the [[EstrogenBrigade predominately female]] fanbase's ''Literature/{{Twilight}}'' obsession (The massive Vampire Stake Fest that followed more than made up for that though).
* ''WebAnimation/HomestarRunner'': [[TheWikiRule Homestar Runner Wiki]] insisted on referring to the "Everybody to the Limit" robot as the "Visor Robot" in spite of the character having been referred to as the "Fhqwhgads Robot" by the site itself. The fanon name was later mistaken as canon ''by the creators of'' Homestar Runner ''themselves'', and as such arguably ascended to canon status.
* In WebVideo/AtopTheFourthWall, Dr. Insano's parallel universe alternate (played by Linkara) was originally just going to be another version of Dr. Insano. However, the fans latched onto the name "Dr. Linksano" and Linkara just went with it. Ditto for them assuming Cable's gun was a literal ChekhovsGun.
* A popular joke among the handlers on ''SurvivalOfTheFittest'' during V4 was that characters who went inactive were fed to the [[BearsAreBadNews inactivity bear]]. Then Megan Nelson went two weeks without a post, the admins dropped her into a cave, [[TakeOurWordForIt a scream was heard]], and the rest is history. The bear's name is [[FluffyTheTerrible Kenny]], by the way.
* For the Literature/ChaosTimeline: Some fan suggested that the head of the Socialist part of Germany should have the title "Oberster Politischer Kommissar", which became canon.
* LetsPlay/{{Raocow}} sometimes lapses into "chipmunk time" during his Let's Plays, meaning that he {{undercrank}}s the footage so that he sounds like a chipmunk, and often treats "chipmunk Raocow" as a separate character. After a fan artist on Website/YouTube named [=roo525=] dubbed Chipmunk Raocow "[[SuperDeformed Chibi-Cow]]", Raocow himself started calling his chipmunk form "Chibi-Cow" as well.
* ''WebAnimation/{{RWBY}}'':
** Fans often joked that Weiss was {{Tsundere}}, to justify pairing her with Ruby - a girl Weiss strongly disliked at the time. Fast forward to Volume 2 and we get this scene of her and Ruby.
-->'''Weiss:''' Shut up, don't touch me! ''(hugs Ruby closer)''
** Fans of the show made IdiosyncraticShipNaming into an art form. In Volume 2 Episode 4, Ruby actually name dropped these during battle to as names for tag-team combination attacks. Sadly, the popular "White Rose" name for Ruby/Weiss was passed over for "Ice Flower."
* In his review of the ''{{Ultima}}'' fantasy series, [[TheSpoonyExperiment Spoony]] is a little more than puzzled by the transition to blasting spaceships out of the sky in the first game, then, much later in the series, mentions the idea that they're the alien Kilrathi from sci-fi shooter ''WingCommander'' based on an easter-egg cameo from a downed ship in a field... which the creator of the series admits in an interview is a very good rationalization "so I'll [[SureLetsGoWithThat go with that]]."
[[/folder]]

[[folder:Western Animation]]
* ''Franchise/{{Transformers}}'':
** The Predacons' ship in ''WesternAnimation/BeastWars'' was unnamed, but Terrorsaur once told Cheetor "Welcome to TheDarkSide" when he ended up on the ship. Though he was just being theatric, fan use of the name led to the name being used for the [=BotCon=] 2006 (convention run by the officially Hasbro-licensed fan club) exclusive toys and the accompanying comic book (as Darks''y''de), and thus the official name.
*** Rhinox's chainguns, most famously used in the first season episode ''Chain of Command''. The unofficial name given to them by the fandom was "Chainguns O' DOOM" and the phrase eventually appeared on Rhinox's bio cards in later toy releases.
** For ''WesternAnimation/TransformersAnimated'', Marty Isenberg liked the FanNickname for Lugnut's exploding-rocket-fist-thing ("Punch of Kill Everything") so much he had the name used in the fourth issue of the comics. Supposedly, he tried to use it in the show, but NeverSayDie reared its ugly head, and no other word really worked there (with the possible exception of [[XtremeKoolLetterz "Krush"]]) to make it abbreviate to POKE.
*** The POKE appears again, with its proper name and everything, in ''VideoGame/TransformersWarForCybertron''; a special move damage upgrade for the Soldier class is called "POKE Alpha", and one of the Leader class's killstreak rewards is the "POKE 2.0", a temporary one-hit-kill melee attack that, when equipped, will prompt the announcer to say, "Punch of Kill Everything equipped!".
** Many fan terms from Franchise/TransformersGeneration1 became official canon over the years. The term "Seekers" for the Decepticon jets (taken from of all things, a toy flyer from 1984), "gestalt" as a catch-all term for combiners (much better than their at-the-time only canon name from the comcis "fusilateral quintocombiners") and the concept of subspace to explain size changes, suddenly appearing weapons and trailers, etc. have all popped up in official stories.
* Many fans of ''WesternAnimation/KimPossible'' theorised that the first name of Kim's brain surgeon mother, Dr. Possible, was "Anne", because it was Kim's middle name, and her father Dr. James Timothy Possible, extrapolated from his sons Jim and Tim. The SeriesFauxnale ''So The Drama'' named Kim's father thus, and the second named Anne in the series' two-part finale. To make this work, one must mention that the creators would occasionally visit fan forums.
* Franchise/{{DCAU}}:
** The parody "Jingle bells, Batman smells" has been circulating since the 1970s. In 1992, the ''WesternAnimation/BatmanTheAnimatedSeries'' episode [[ChristmasEpisode "Christmas With The Joker"]] had (who else?) SelfDemonstrating/TheJoker [[AscendedMeme singing]] [[http://www.youtube.com/watch?v=Veju4PxhuGc the parody]]. And in ''WesternAnimation/JusticeLeague'', when the founding members (except Batman) agreed to be arrested because of an accident involving a giant laser, one of the officers asks where Batman is. The Flash says "Running late. The Batmobile, it lost a wheel. The Joker got away. That's what I heard."
** Also in ''Justice League'', the entire flirting between Batman and Wonder Woman came because of a scene in Gorilla Grodd's introduction episode, in which Batman, believing Wonder Woman was crushed by rubble, started digging with his hands. After escaping by herself, she saw Batman's hands covered in dirt and gave him a gratitude kiss in the cheek. Batman blushed at this, and fans believed there was something between them. While it was not the case at the time, the writers liked the idea and put it into the show.
* ''TheSpectacularSpiderMan'''s GregWeisman does it [[http://www.s8.org/gargoyles/askgreg/search.php?qid=11582 here]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** The DJ unicorn is on screen [[OneSceneWonder for a total of five seconds]] in the episode "Suited for Success", but became popular with the fanbase due to her striking design and cool job. A meme circulated of making Website/YouTube videos with her head-bobbing looped over various house, techno and electronic music tracks, calling her "[=DJ-P0N3=]" (in reference to Music/{{deadmau5}}). The Hub's extended trailer, [[FilkSong a rewrite of]] Music/KatyPerry's "California Girls" called "[[ImageSong Equestria Girls]]" (and sung by Pinkie Pie's canonical singing voice actress!), addressed the pony as [=DJ-P0N3=], pronouncing it 'pone-three' to prove the reference. The song also used the FandomNickname "brony" to refer to [[PeripheryDemographic older male fans of the show]]. [=DJ-PON3=] later made it into the toy line under this name, as well (and in a Fan Favorites set, to boot!).
** In "Over a Barrel," Fluttershy mentions how she'd like to be a tree, which [[MemeticMutation became a meme]] ("Fluttershy is/deeply wishes to be a tree"). In the Season 2 episode "Hurricane Fluttershy," she tries to get out of going to the big pegasus meeting by disguising herself... as a tree.
** A gray background pony with a blonde mane had her eyes crossed in one scene of the pilot, either due to an error or a bored animator. Fans quickly noticed, nicknamed her Derpy Hooves and came up with a personality for her. She quickly started getting scripted appearances, complete with crossed eyes, and eventually, in the second season episode "The Last Roundup", both her name and the fanon personality (a klutzy but friendly mare) were made canon. She was made into a "Fashion Style"-sized toy as a 2012 San Diego Comic Con-exclusive, her box decorated with muffins ([[TrademarkFavoriteFood an obsessive fixation on muffins]] being one of the most pervasive aspects of her fanon personality). She also made it into the second Fan Favorites set of normal-sized toys[[hottip:*:(along with Lyra Heartstrings, below)]], [[TheTropeFormerlyKnownAsX with her name replaced by]] [[LuckyCharmsTitle a muffin symbol]]. And speaking of muffins, she's seen wearing a bag with a muffin clip on it when shopping in "Putting Your Hoof Down."
** One of the background ponies with a lyre cutie mark was dubbed "Lyra" by the fans. When the fourth wave of blind bag toys were released, the pony with the same coloration and cutie mark was officially named "Heartstrings". The fans compromised by making "Heartstrings" her surname, and when the fifth wave of blind bag toys rolled around, the character was officially referred to as "Lyra Heartstrings."
** Lyra and another background pony, that got the FanNickname Bon Bon, were frequently paired together in crowd shots due to how their color schemes matched up, leading the fans to believe that the two are either inseparable best friends or romantic partners (so influential is this fan-interpretation that the Lyra/Bon Bon pairing is '''the''' most widely accepted [[{{Shipping}} ship]] of the entire show [[OneTruePairing by a long shot]]). The famous 2011 Comic Con poster intentionally placed the two next to each other as a nod to this (and next year's Season 2 poster did likewise), and in Season 2 they were allotted their own {{Funny Background Event}}s in "Secret of My Excess" and "Putting Your Hoof Down".
** A similar case to Lyra's aforementioned renaming happened to minor antagonist [[MilesGloriosus Trixie]]. One of the blind bag glitter ponies bearing Trixie's color scheme and cutie mark was named "Lulamoon," presumably because the name Trixie couldn't be copyrighted. Fans took it as either a last name or a stage name. The fifth wave of blind bags went with the former.
** The official pony trading cards refer to the mayor of Ponyville as "Mayor Mare", a FanNickname that had been used by the fans since the character's introduction.
** On the same card as Mayor Mare, the Creator/DavidTennant-esque pony referred to by fans as [[Series/DoctorWho Doctor Whooves]] was given a name and background that tied into the fanon circulating around him: Time Turner, Ponyville's official timekeeper, responsible for maintaining the town clocks, running the timer for competitions, and all other things "[[TimeyWimeyBall timey-wimey]]".[[note]](Yes, that last part is an explicit ''Doctor Who'' ShoutOut, and they actually put it on the card.)[[/note]] And then in the official IDW comic book, he found his fob watch and got his memories back. He was later officially named Dr. Hooves (as with Trixie, the omission of the W at the beginning was almost certainly due to copyright anxiety).
** Speaking of the cards, they also put fan-favorite pairing ([[VitriolicBestBuds platonic]] or [[ShippingGoggles otherwise]]) Octavia and Vinyl Scratch/DJ-Pon3 on one, despite the two ''never sharing an episode''.
** One of the more bizarre examples of a FanNickname being made official was a sea serpent from the two-part pilot given the non-sequitur name "Steven Magnet" for his toy figure. The name originally came from, of all things, a screenshot of the character with the Website/YouTube Automatic Caption "steven magnet" below him ([=YouTube=] captions tend to be hilariously wrong and nonsensical at times).
** Fan art often portrayed Wonderbolt stallion Soarin as having exact same cutie mark as he does with his flight suit on. This eventually became canon in the season 2 finale where he can briefly be seen without it.
** The ArtifactOfDoom from Season 3's "Magic Duel" is called the "Alicorn Amulet", referencing the fan name for {{Winged Unicorn}}s like Celestia and Luna. This was later confirmed by the season 3 finale, which uses the term to refer to winged unicorns.
** [[Recap/MyLittlePonyFriendshipIsMagicS3E6SleeplessInPonyville "Sleepless in Ponyville"]] rendered two long-standing fan theories canon: the first being that Scootaloo views Rainbow Dash as a big sister figure, and the second being that [[spoiler:Luna is a DreamWalker]].
** Fans had repeatedly commented on how young pegasus pony Scootaloo never flies on-screen, some wondering if she could at all. In second-season episode "Ponyville Confidential", a nod was made to this where she frantically flaps her wings while falling out of a tree, but still lands in the mud. Eventually, the fourth-season episode "Flight to the Finish" [[DoesThisRemindYouOfAnything said outright that she's not able to fly (at least for the moment), and essentially treated this as a disability]].
** King Sombra's official trading card mentions the possibility that he could have survived being turned into crystal and shattered via his horn.
** [[Recap/MyLittlePonyFriendshipIsMagicS4E3CastleManeia "Castle Mane-ia"]] introduces the idea of a Pony of Shadows formed from remnants of Nightmare Moon when she was banished to the moon. The origin is different, but this is very similar to the notion of the "Blessing" and the creation of Nyx in ''Fanfic/PastSins''.
** [[Recap/MyLittlePonyFriendshipIsMagicS4E25TwilightsKingdomPart1 "Twilight's Kingdom, Part 1"]]:\\\
Ever since it was first mentioned in [[Recap/MyLittlePonyFriendshipIsMagicS2E20ItsAboutTime "It's About Time"]], Tartarus became subject to fan fics about one (if not all) of the monsters imprisoned there breaking free. In this episode, our villain does just that.\\\
"Alicorn Princess Discord". [[Recap/MyLittlePonyFriendshipIsMagicS3E13MagicalMysteryCure Thanks, M.A. Larson!]].\\\
Earth Ponies being stronger than the other two tribes was a piece of fanon so common that it was near-universally accepted. It helps that it was established by WordOfGod or at least WordOfDante, and there have always been things such as ''only'' earth ponies plowing snow in "Winter Wrap Up", or Cheerilee and Ms. Peachbottom's ''epic'' {{Juggernaut}} moments in "Hearts and Hooves Day" and "Games Ponies Play", respectively, and Big Mac and Maud's RunningGag of ''insane'' SuperStrength. It was up to fans whether to take those moments as proof of earth ponies being stronger as a trait of the race, or as the pegasi and unicorns having other jobs in the first case and RuleOfFunny in all those others, but now Celestia confirms this as canon when she mentions that "without their strength" (drained by Tirek), they would not be able to tend the land.
* ''WesternAnimation/AdventureTime'':
** A viewer's FanArt character, Me-Mow the tiny cat assassin, was introduced to the Land of Ooo in her own self-titled episode.
** Being the two oldest characters in the show, it was a fanon idea that Marceline and the Ice King had known each other in the past. Cue "I Remember You" where it's revealed [[TearJerker they knew each other more than anyone guessed.]] The story [[ParentalSubstitute was continued]] in "Simon and Marcy".
** Ever since "What Was Missing" the idea that Marceline and Bubblegum used to date swiftly became a fixture in the fandom. After years of [[ShrugOfGod the staff refusing to comment]], Olivia Olsen, Marceline's voice actress, confirmed that this was the case.
* The name "Lyoko-Warriors" ("Lyoko-guerriers" in french) was invented by the ''WesternAnimation/CodeLyoko'' fans to refer to the protagonist team, who had no specific name in the first two seasons. The term was eventually made Canon starting with season 3.
* It was a popular {{Fanon}} theory for ''WesternAnimation/PhineasAndFerb'' that Ginger, the Asian Fireside Girl, was Stacy's little sister (probably due to there not being too many other Asian people in Danville). The season 4 premiere "For Your Ice Only" officially made this the case.
* While most fanon for ''WesternAnimation/{{Superjail}}'' remains only that, the concept of Lord Stingray being yellow-skinned seems to have been referenced by the colorists for the season 4 premiere ([[NegativeContinuity though he was previously visually implied to be a generic white guy]]). The yellow skin used by fanartists was either utilized to depict him as a mutant, or used as a placeholder color due to him not having been seen outside his uniform at the time.
* A theory among ''WesternAnimation/TheSimpsons'' was Sideshow Bob's up-and-down bouts of mania being attributed to a heart condition. This ended up becoming a plot point of sorts in a Season 19 episode, where [[spoiler:a vial of his nitroglycerin medication is thrown out a window and he subsequently "dies"]].
* In ''TotalDramaAction,'' a recurring [[TheIntern intern]] attracted attention and, because someone thought he looked a bit like BillyIdol, was nicknamed "Billy the Intern." Not only does he appear a lot more in the third season, the show's official blog refers to him as "Billy."
* In the original ''Franchise/ScoobyDoo'' there was no evidence supporting anything but typical friendship between cast members, but this didn't stop the wide portrayals of certain characters as {{Implied Love Interest}}s, mainly Fred and Daphne in the late 60s and early 70s, and then in contrast between Daphne and Shaggy in the 80s. But at no point was any of the franchise really presenting love interests until Shaggy's tussles in the Superstars 10 films. From then on the general stance became WillTheyOrWontThey, and by ''WesternAnimation/ScoobyDooMysteryIncorporated'' such relationship hints became a part of the plot. And ''Scooby Doo Stage Fright'' turns it back into a subplot and throws it back to WillTheyorWontThey in the very next film.
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