{{Fanfiction}} is a popular medium, and thanks to the nature of SturgeonsLaw, some of it can indeed be quite good to read.

And some of that fanfiction may actually become so interesting to some readers, that those readers are inspired to write fanfiction based on those stories, despite the fact (or perhaps ''because'' of it, in some cases) that the original story is fanfiction in and of itself…

This is Recursive Fanfiction.

Care should be taken with this trope, as the story that said fanfic is based on ''must'' be a fanfiction as well. If the fiction that it is based on is not itself based on another work of fiction, then that’s a normal FanFic, and not this trope.

Or, schematically:

Original fiction → regular fanfiction → Recursive Fanfiction → still Recursive Fanfiction, but of a higher (deeper?) level.

The reaction of the author of the ''original'' FanFic tends to vary. Responses may range:
* At one extreme, they may outright encourage it and even adopt some or all of it into the canon of their own continuity (creating a shared FanVerse)
* They may have a positive reaction, but without "adopting" the new material.
* They may give it ambivalent acknowledgement or ignore it entirely.
* They may express polite distaste for it.
* Quite ironically, they may [[{{Hypocrite}} get upset at people for "stealing" their ideas]].
* They may express disgust if its particularly bad.

Not to be confused with MetaFic.



[[folder:Anime & Manga]]
* ''[[https://www.fanfiction.net/s/5158315/1/A-Throne-of-Bayonets "A Throne of Bayonets"]]'' has an authorized sequel written by a different author, ''Fanfic/ACrownOfStars''
* ''FanFic/DreamingOfSunshine'' has a single sidestories by the same author and a lot of fanfics written by fans. There is a community in ffnet dedicated to collect the side stories.
* ''Fanfic/TheOneILoveIs'': Several fans wrote a bunch of side-stories, parodies, and even an authorized sequel.
* ''Fanfic/TheSecondTry'' and ''Webcomic/AkiChansLife'' have a fancomic based on it.
* ''FanFic/NobodyDies'' has several sidestories written by both the author and others, including ''Six [=AIs=], One Continent'' and ''The Kei Files''.
* ''FanFic/KyonBigDamnHero'' has [[http://www.fanfiction.net/s/7106575/1/ Traveller]].
* ''FanFic/MeetTheSuzumiyas'' has ''[[http://www.fanfiction.net/s/8540246/1/The-Observations-of-Damon-Rizuela The Observations of Damon Rizuela]], written with permission from [=JonBob0008=].
* ''FanFic/NeonGenesisEvangelionR'' has ''[[http://fanfic-mausoleum-n-grill.dreamwidth.org/tag/evangelion+redemption Evangelion: Redemption]]''.
* The ''Manga/DeathNote'' fandom has at least two fanfics that inspire recursive fanfiction:
** [[http://www.fanfiction.net/s/3813281/1/Poison_Apple Poison Apple]] by RobinRocks and Narroch has five: [[http://www.fanfiction.net/s/4823586/1/Human Human]], [[http://www.fanfiction.net/s/6807006/1/Doom Doom]], [[http://www.fanfiction.net/s/6807013/1/My_love My love]], [[http://www.fanfiction.net/s/7339651/1/The_End The End]] and [[http://www.fanfiction.net/s/4304231/1/Broken_Fairytale Broken Fairytale]].
** [[http://www.fanfiction.net/s/5154854/1/PITCH PITCH]] by uberneko-zero has two: [[http://www.fanfiction.net/s/7274051/1/A_Different_Shade_of_Pitch A Different Shade of Pitch]] and [[http://www.fanfiction.net/s/6836104/1/Lips Lips]].
** [[http://www.fanfiction.net/s/3529129/1/ True Elision]] very recently inspired a KinkMeme fill: [[http://www.fanfiction.net/s/7595429/1/The_End The End]] which in turn got its own sequel [[http://www.fanfiction.net/s/7543896/1/Heart Heart]]. Ironically, the first two [[{{GuyonGuyIsHot}} are yaoi]] and the last one is {{Het}}.
** ''Fanfic/LightAndDarkTheAdventuresOfDarkYagami'' has inspired several fan sequels: [[http://www.fanfiction.net/s/9793696/1/Light-and-Dark-Returning-of-D-ark Returning of D'ark]], [[http://www.fanfiction.net/s/9232528/1/Light-and-Dark-DEUX-The-New-Adventures-of-Dark-Soichiro Light and Dark DEUX]], [[http://dn-kink2.livejournal.com/1491.html?thread=1606355 SAD GOODBYES]], and a RoundRobin [[http://dn-kink2.livejournal.com/1491.html?thread=1638099 post game]].
* [[http://lesswrong.com/lw/18g/the_finale_of_the_ultimate_meta_mega_crossover/ The Finale of the Ultimate Meta Mega Crossover]] technically counts, since it contains references to at least four different fanworks (''Manga/ReTake'', ''Fanfic/ThousandShinji'', ''Fanfic/ShinjiAndWarhammer40K'', and ''Fanfic/OnceMoreWithFeeling''). However, it's more notable for being infinitely self recursive.
* [[http://www.fanfiction.net/s/1230438/1/Shadow_League Shadow League]] is a fanfic based off the infamous DarkFic ''FanFic/PokemonMaster'', amongst countless others.
* ''Webcomic/AxisPowersHetalia'':
** Say what you will about the infamous ''Webcomic/AxisPowersHetalia'' "Economic Crisis Gangbang" KinkMeme fill and its [[RapePortrayedAsRedemption content]], but it proved popular enough to spawn a plethora of spinoffs about America's PTSD after the event, what would have happened if the other nations had mistaken Canada for America or if America had [[ForgotICouldFly actually put his]] SuperStrength [[ForgotICouldFly to good use]] or [[WhatTheHellHero chewed out the other nations for their heartlessness]], a consensual or at least less disturbing version of it, etc.
** The TearJerker ending of the US/UK [[{{Doujinshi}} doujin]] ''Silencer'' affected some readers enough to write/draw FixFic for it.
** The infamous {{Gorn}} fic ''Debt'' has a recursive parody fanfic written by its own authors, in which the first chapter is rewritten as a cosplay game GoneHorriblyWrong in which the China cosplayer turns out to be a psychopath and breaks out the knives. Taking this as an implication that the writers wouldn't mind it being parodied (particularly since they expressed pride that the original ''Debt'' nearly ended up on the SoBadItsHorrible page, back when it had a section for FanFic), someone made a [[http://chelonianmobile.deviantart.com/art/Repaid-292831424?q=gallery%3Achelonianmobile&qo=3 fanart piece]] depicting China confronting his VillainSue replacement (not work safe for swearing, blood, and suggested extreme violence).
** Not to mention all the fanfics on what the ending could've been for VideoGame/HetaOni...
** ''FanFic/HumanCuriosity'' has a prequel fic, ''What Curiosity Brings'', which is being written with permission by the original fanfiction's author.
* ''FanFic/DungeonKeeperAmi'' has spawned several of these (though most of them are short one-shots), and there's FanFic/DungeonKeeperOfLoveAndJustice, an AU fanfic.
* ''Fanfic/InFlight'' has spawned several spin-offs, most notably ''Fanfic/TheEmiyaClan''.
* The ''LightNovel/DirtyPair'' fanfic ''[[http://www.fanfiction.net/s/157673/1/I-Am-One I Am One]]'' by Sean Gaffney is a followup to Larry Mann's [[WordOfDante influential story]] ''[[http://www.eyrie.net/ETC/DP/E-101E/Experiment101.txt Experiment 101-E]]''. (The story covers the same basic ground as the sequel Mann co-wrote with Ryan Matthews, ''[[http://www.eyrie.net/ETC/DP/Reunions/ Reunions]]'', but goes in a different direction.) Gaffney's sequel to ''I Am One'', ''[[http://www.fanfiction.net/s/228050/1/Won-t-Get-Fooled-Again Won't Get Fooled Again]]'', raises the stakes on this trope by including several other authors' Dirty Pair original characters as cameos ([[FusionFic along with the multiple]] [[IntercontinuityCrossover crossover characters]]).
* ''[[Fanfic/BoyScoutsOneHalf Boy Scouts ½]]'' is a ''Manga/RanmaOneHalf'' ElsewhereFic centering on a group of SelfInsert characters from Massachusetts. When three acquaintances of the creator of ''Boy Scouts ½'' were given cameo appearances in one story, one of those acquaintances began a {{Spinoff}} series called ''Perspectives.''
* ''Fanfic/GameTheoryFanFic'' served as a large inspiration for ''[[http://forums.spacebattles.com/threads/ragazza-magica-renza-veneti-pmmm-lyrical-nanoha-fusion.247741/ Ragazza Magica Renza Veneti]]'', a crossover with ''Anime/PuellaMagiMadokaMagica'', though more in the way of setting than plot.
* ''Fanfic/ToTheStars'', a ''Anime/PuellaMagiMadokaMagica''/Hard Sci-Fi mashup set several centuries after the end of the series, has several fanfictions based on the fic's universe, which were [[AscendedFanon integrated into the story canon]]:
** The biggest one, [[http://www.fanfiction.net/s/9831632/1/Solemnis Solemnis]] (and its sequels, ''Sodales'' and ''Aevitas'') set a few years before the beginning of the main fic story, following an average Magical Girl as she contracts and through her military training and first battles.
** [[http://www.fanfiction.net/s/8516649/1/Puppets Puppets]], a spin-off set in a rogue colony hidden from everyone decades before the main story, following a Magical Girl's journey to free her world from its tyrannical regime.
** [[http://www.fanfiction.net/s/9402909/1/Those-Who-Take-the-Sword Those Who Take The Sword]], set during WWI, involving Clarisse Von Rossum, immortal Magical Girl historian and explorer and part of the supporting cast from the main story.
** It also spawned a couple of non-canon crossover fics, such as [[http://www.fanfiction.net/s/9107321/1/Reaching-for-Eternity Reaching for Eternity]] (crossover with Manga/MinamiKe) or [[http://www.fanfiction.net/s/8627626/1/L-Effetto-Magico L'Effecto Magico]] (crossover with VideoGame/MassEffect)
* ''Fanfic/HalkegeniaOnline'' has numerous fan-made side stories. One of them, ''Fanfic/HalkegeniaOnlineZeroHour'' has grown to be a full size fanfic in its own right, for which people are starting to write fan-made side stories.
* The Fanfic/ElementalChessTrilogy has a few of these.
* ''Fanfic/YesterdayUponTheStair'', a ''Manga/MyHeroAcademia'' fanfiction, has inspired at least 2 works, which can be found on its Fanfic Rec page.

[[folder:Comic Strips]]
* There's a lot of unofficial [[Fanfic/TheCalvinverse Calvinverse]] stories out there. Among them is ''Fanfic/ThePezDispenserAndTheReignOfTerror''.

[[folder:Films -- Animation]]
* The well-known ''WesternAnimation/HowToTrainYourDragon'' fanfiction ''Fanfic/{{Hitchups}}'' got one, a oneshot based off the story with the author's permission called ''The Elder's Prediction.''
* This occurs at least three times in ''Disney/TheLionKing'' fandom:
** ''Fanfic/TheLionKingAdventures'' is the most famous example, with no shortage of fan fiction being made by the fans. Even the [[{{Spinoff}} spin-offs]] have fanfics.
** "Chronicles of the Pridelands" invented the character Tanabi, Simba’s son. Nearly every ''TLK'' fan began using the character in their own {{Next Gen Fic}}s. His popularity soon declined though, due to the release of the semi-official ''Six New Adventure'' book series, which gave Simba a different son, Kopa. The release of the second film with the arrival of Kiara made all but the oldest fans forget Tanabi.
** [[http://tlk-fancomics.deviantart.com/gallery/42286638 Joanna-TLK’s fancomic]] continues on from the last chapter of [[http://tlk-fancomics.deviantart.com/gallery/?set=30863120&offset=0 Savu0211’s fancomic]], which by then, had almost nothing to do with the original films.

[[folder:Films -- Live-Action]]
* ''FanFic/ThePrivateDiaryOfElizabethQuatermain'' has some, or did at the time it was being written; at least one has since been taken down.
* The ''FanFic/LostInTimeSeries'' has one called ''Lost in Time: Destiny''.

* ''[[http://www.equestriadaily.com/2011/08/fallout-equestria-project-horizons.html Project Horizons]]'' by Somber -- a Recursive Fanfiction for the WesternAnimation/MyLittlePonyFriendshipIsMagic[=/=]{{VideoGame/Fallout}} crossover fanfiction ''Fanfic/FalloutEquestria'' by Kkat -- has already spawned fanfiction of its own.
* ''[[Fanfic/DrunkardsWalk Drunkard's Walk]]'' has inspired a number of fanfics, collectively known as ''The Drunkard's Stagger''.
* ''Fanfic/EdventureOfTheThousandYearDoor'' has ''[[http://www.fanfiction.net/s/7145922 As This Train Goes]]'', a WhatIf fic asking what would happen if Sarah was the legendary hero and if Edd and the others weren't charged of collecting the Crystal Stars. Sadly, it's a DeadFic.
* ''WebAnimation/TurnaboutStorm'':
** {{Invoked|Trope}} for the "[[IncrediblyLamePun Wright]] a Bad Ending" contest, where fans were invited to write what would have happened if no one had shown up to save the day [[DarkestHour when everything seemed lost]].
** Many fan works based on the series have been made, including [[http://youtu.be/OP5JNpe6j_o a cancelled spin-off]], [[http://www.fimfiction.net/story/6177/phoenix-wright-turnabout-storm an unofficial novelization]] that adds an InterspeciesRomance subplot, and several {{Fan Sequel}}s.
** A sequel series by a different writer known as WebAnimation/ElementsOfJustice is currently in development. Much like Turnabout Storm, the series follows the VisualNovel style of the Franchise/AceAttorney games and is fully voiced.
* The MegaCrossover FanWebcomic ''Webcomic/{{Roommates}}'' has a whole ExpandedUniverse worth of fanfiction based on it called the ''{{Webcomic/Buildingverse}}''. With five separate spin-offs (''Webcomic/GirlsNextDoor'', ''Webcomic/DownTheStreet'', ''Webcomic/{{Superintendent}}'', ''Webcomic/MeanwhileUpstairs'' and ''Fanfic/OnlyADream'') having trope pages and if we wanted to be perfectly precise ''Webcomic/DownTheStreet'' is a ''Webcomic/GirlsNextDoor'' fancomic.
** To make things even more complicated a lot of these works add even more {{Crossover}}s or take characters / concepts from yet other fanfiction creating a TangledFamilyTree that rivals the magical people's[[note]](In this 'verse each and every magical being from every fanon EVER is related somehow)[[/note]].
** And then there's the fact that ''Webcomic/{{Roommates}}'' [[AscendedFanon sometimes uses ideas and OCs from]] ''Webcomic/GirlsNextDoor'' (and its other spin-offs), to the point where they could almost be considered fanfics for ''each other''.
** To make it "clearer" a flowchart of the relationship between the three main troped ones (misses ''Meanwhile Upstairs'' and ''Only A Dream'' also adding all would be bad for sanity) and the world [[http://static.tvtropes.org/pmwiki/pub/images/Building-verse_relationships_6402.jpg here]]. Block arrow main relationship, normal arrow other influence / ascended fannon / etc..
* ''FanFic/BetterLivingThroughScienceAndPonies'' spawned a Chapter 4.5.
** There is now ''[[http://www.fimfiction.net/story/109545/a-trusted-friend-in-science-and-ponies A Trusted Friend in Science and Ponies,]]'' which is a direct sequel.
* ''FanFic/TheInfiniteLoops'' loves to play with fan concepts, having loopers discover a variant of their own reality based on fanon and a few fanfics. The My Little Pony loops even bring [[FanFic/PastSins Nyx]] into the cast, and Twilight flat out states they do not talk about [[FanFic/TheConversionBureau the bureau.]]
* ''Fanfic/AceCombatEquestriaChronicles'' has a spin-off, ''[[http://www.fimfiction.net/story/116859/ace-combat-gryphon-wings Ace Combat: Gryphon Wings]]'', which takes place ten months after ''The Equestrian War'' and serves as a tie-in between the two main stories.
* The ''Film/{{Thor}}''[=/=]''Series/{{Being Human|UK}}'' fanfiction series, ''FanFic/{{Housemates}}'', has a few spin-offs. The first is ''[[http://archiveofourown.org/works/1089687/chapters/2192950 Clean: a Housemates series story]]'' by [[http://archiveofourown.org/users/flutterflap/pseuds/flutterflap flutterflap]], is a rewrite Series 2 of ''Series/{{Being Human|UK}}'' in the "Housemates universe". Another is the one-shot ''[[https://www.fanfiction.net/s/9068598/1/The-Morning-After The Morning After]]'' by [[https://www.fanfiction.net/u/257559/Mikkeneko Mikkeneko]].
* ''Fanfic/ProjectBluefield'': The ''VideoGame/FireEmblemFates: Devastation'' stories are set in an AlternateContinuity of fellow writer Creator/TheApocryphalOne's ''Unexplored Chronicles'' series--specifically, ''FanFic/TheInvisiblePrincess'' and ''FanFic/TheLostKing''. (''Project Bluefield's'' WordOfGod says that ''FanFic/FireEmblemFatesAftermath'' may not occur--certainly not in the same way as the original.) Apocrypha's ''Unexplored Chronicles'' are in turn fanfiction of ''VideoGame/FireEmblemFates''.
* The work on ''Fanfic/TheLittlePonyLegend'' is...interesting to say the least. The original SeriesFic was written all by one author: [[https://www.fanfiction.net/u/5396591/MaggiesHeartLove Maggiesheartlove]]. However, with her wanting to start working on her own original works, she passed the main writing duties on to others to either continue or explore her saga in different ways. However, she did retain the privilege of being an editor for the others, so while she no longer controls the story, she can temper it so it matches her vision. Most recent in this change is [[https://www.fanfiction.net/s/11525573/1/The-Little-Pony-Legend-Shadow-of-Ronin The shadow of Ronin]].

* There are multiple fanfics based around ''Act 1'' and ''The father of Death'' by Music/TheProtomen. Which themselves are a set of two [[DarkFic Dark]] AlternateUniverse Fics based on the original ''VideoGame/MegaMan'' game.

* ''Fanfic/HarryPotterAndTheMethodsOfRationality'' has not only inspired its own fanfics, such as ''Once Upon a Tower'' and ''Nightmares of Azkaban'', but "Rational" fics have become a kind of sub-genre. The epilog was purposely delayed a year to allow sequel fics time to get established, and examples like [[https://www.fanfiction.net/s/11117811/1/Ginny-Weasley-and-the-Sealed-Intelligence Ginny Weasley and the Sealed Intelligence]] started popping up in less than a week.
** The most famous Rational fic beside ''Methods'', ''FanFic/{{Luminosity}}'', has spawned several fan short stories.
* The large ''Literature/HarryPotter'' projects ''The Shoebox Project'', ''Dumbledore's Army and the Year of Darkness'' and the Fanfic/{{Dangerverse}} have their own fanfic.
* All the sequels or rewrites to the infamous ''Fanfic/MyImmortal''.
* ''Fanfic/HarryPotterAndTheNightmaresOfFuturesPast'' has inspired [[https://www.fanfiction.net/s/10213764/1/ G for Ginevra]].
* The ''Literature/HarryPotter'' fanfic [[https://www.fanfiction.net/s/2318355/1/ Make a Wish]] was the inspiration for [[https://www.fanfiction.net/s/9510186/1/ Terminal Justice]].
* The {{Literature/Worm}} fanfic [[https://forums.spacebattles.com/threads/internship-worm.463000/ Internship]] spawned the fic of the fic [[https://forums.spacebattles.com/threads/deputy-internship-worm-au-au.483163/ Deputy]] which has now spawned the fic of the fic of the fic [[https://forums.spacebattles.com/threads/aegis-must-die-deputy-internship-worm-au-au-au.505904/ Aegis Must Die]], as well as the truly dizzying [[https://forums.spacebattles.com/threads/emissary-a-deputy-recursive-crossover-worm-au-canon.532150/ Emissary: A Deputy Recursive Crossover]], which crosses the Taylor from "Deputy Commander" with canon Worm.
* ''FanFic/{{crawlersout}}'': Two, both Harry/Grindelwald, with Grindelwald's POV. One is by the original author, called ''[[https://www.fanfiction.net/s/11660037/1/begin-again begin again]]''. The other is by [[https://www.fanfiction.net/u/2221413/Tsume-Yuki Tsume Yuki]], called ''[[https://www.fanfiction.net/s/11521284/1/Fineshine Fineshine]]''.
* ''[[https://www.fanfiction.net/s/7768275/1/The-Fate-Changed-Now-What The Fate Changed Now What?]]'' was inspired by ''[[https://www.fanfiction.net/s/5725656/1/Fate-s-Favourite Fate's Favourite]]'', a Harry/Tom Riddle fic.
* ''[[https://www.fanfiction.net/s/10843405/1/Kaleidoscope-of-Magic-Machinations-of-Time Kaleidoscope of Magic: Machinations of Time]]'' is a spinoff of Literature/HarryPotter fic ''[[https://www.fanfiction.net/s/9101451/1/Kaleidoscope-of-Magic Kaleidoscope of Magic]]''.
* ''Literature/WarriorCats'': The TrollFic ''Fanfic/StarkitsProphecy'' has numerous reaction fics, fix fics, and parodies. It even has a few animated and comic adaptations.

[[folder:Live-Action TV]]
* There are quite a few stories written by authors other than the original CP Coulter that use original characters from the ''Series/{{Glee}}'' fanfic ''Dalton''.
* ''FanFic/TheHarmonVerse'', a series of ''Series/{{Glee}}'' fanfics centred around the OriginalCharacter of Jack Harmon. It includes four ongoing novelizations of ''Series/{{Glee}}'' and over 40 stories altogether.
* ''Fanfic/TheContract'' has ended up spawning a number of other fanfics, forming [[TheVerse a world]] known as the Contractverse. They include:
** ''[[http://www.fanfiction.net/s/2896318/1/Lifeline Lifeline]]'', a companion piece to ''The Contract''.
** ''[[http://www.fanfiction.net/s/3388312/1/Exigencies Exigencies]]'', a ContinuationFic for ''The Contract''.
** ''[[http://www.fanfiction.net/s/3428758/1/ Recovery]]'', ''[[http://www.fanfiction.net/s/3557391/1/ Where the Rails Converge]]'', and ''[[http://www.fanfiction.net/s/5092702/1/A_Gentle_Knock_at_the_Door A Gentle Knock at the Door]]'', all separate sequels to ''Exigencies''.
** ''[[http://www.fanfiction.net/s/5412732/1/PATIENT PATIENT]]'', a sequel to ''A Gentle Knock At The Door''.
** ''[[http://diysheep.livejournal.com/20287.html#cutid1 Creepy Pencil Story]]'', a short "What-If" story,
** ''[[http://alex51324.livejournal.com/32577.html Pencils are Dangerous]]'', a sequel series to ''Creepy Pencil Story''.
** ''[[http://www.fanfiction.net/s/5299378/1/The_Kindness_of_Strangers The Kindness of Strangers]]'', a oneshot addition to ''Pencils are Dangerous''.
* ''[[http://archiveofourown.org/works/180121/chapters/264839 Two Two One Bravo Baker]]'', a military ''[[Main/AlternateUniverseFic AU]]'' of the ''Series/{{Sherlock}}'' universe, has spawned its own works of fanart and fanfic.
* Series/TheMightyBoosh fandom has several rather famous fanfictions, notably Stockholm Syndrome, that were so popular that they spawned countless fanfictions based on it from other authors. The number of fanfictions and fanarts based on Stockholm Syndrome ballooned after it was revealed Creator/NoelFielding himself was a fan of the fanfiction and inserted references to it into a live performance.
* [[http://www.tthfanfic.org/Author-22082/DianeCastle.htm DianeCastle's]] Fanfic/TheSecretReturnOfAlexMack has spawned ''fifteen'' recursive fanfics, thanks in part to its epic length and regular updates, including two heartfelt tributes to [[spoiler: Pyre after her HeroicSacrifice in chapter 219.]]
** There are so many now that it has spawned the so-called "Teraverse," named after Alex's superhero secret identity Terawatt. A quick search on [[https://www.tthfanfic.org/browse.php?kw=teraverse&rmin=1&rmax=5&wmin=1&wmax=5000000&submit=Search TTH]] now gives 49 results. Two or three of these are by the original author, but everything else is fanfic of fanfic. There's more to be found on other sites as well.

[[folder:Video Games]]
* There's been at least one doujin based on ''[[VideoGame/PatchCon PatchCon! Defend the Library!]]''.
** People seems to like the concept of [[Anime/FinalFantasyVIIAdventChildren Advent]] [[RecycledINSPACE Cirno]] a lot, and there are a lot of fanarts of it in Website/{{Pixiv}}.
** In fact, many ''{{VideoGame/Touhou}}'' doujins use personality quirks ascribed/invented/{{Flanderized}} by previous authors (such as Sakuya's ACupAngst, Aya's paparazzi behavior, Cirno's idiocy, etc.) that have no basis in canon, due in part to the lack of CharacterDevelopment in the official games and WordOfGod that comes out years later people are used to the fanon personalities. For example, most doujin portray Keine as teaching human and youkai children alike despite it being official that she doesn't like youkai. Similarly, Momiji is often shown as Aya's long-suffering subordinate when they actually don't like each other very much.
* ''Franchise/{{Pokemon}}'':
** ''Fanfic/PokeWars'' has spawned at least ''twelve'' fics based on Cornova's world.
** There have been multiple fanfics written based on ''Webcomic/BlackAdventures''.
** And a huge community based on ''Fanfic/{{Pokeumans}}'', with literally hundreds of members.
* The infamous ''Videogame/{{Portal}}'' fic ''[[FanFic/{{ITSMYLIFE}} ITS MY LIFE!]]'' has at least several. It doesn't help that one of the authors of those fics largely drew elements from ''another'' shared universe based on ''Portal'', namely the ''FanFic/PortalThe4thMillenniumFranchise''.
* ''[[http://forums.darknestfantasyerotica.com/showthread.php?260-Ethereum-Gladiator-Kynrind-s-Capture Kynrind's Capture]]'' is one based on the PornWithPlot ''VideoGame/{{Warcraft}}'' fic, ''Ethereum Gladiator''.
* Subverted with ''FanFic/{{Morphic}}'', where a new author was supposedly going to write his own sequel to the original fic... only it turns out the whole thing was planned out ahead of time by the original author as part of an elaborate April Fool's prank.
* The ''VideoGame/{{Oolite}}'' project is a FanRemake of ''VideoGame/{{Elite}}'', so all ''Oolite'' fan works are essentially ''Elite'' fan works by proxy. Additionally, the game is also highly moddable; well-received [[GameMod Oolite Expansion Packs]] inspire authors to incorporate their features into their fics, and new ideas from fanfic writers in turn inspire new [=OXPS=]. Furthermore, developers and community regulars frequently [[{{Tuckerization}} include versions of one another's in-game personas]] in their own fan works.
* ''Dragon Age'' fandom has spawned [[http://http://feynites.tumblr.com/ Feynite]], an author whose work seems to inspire a significant amount of this.
* ''VideoGame/{{Undertale}}'' has quite a few of these. Among its large number of alternate universes are several [=AUs=] of [=AUs=]; for example, [[FlowerMotifs Flower]][[TearJerker fell]], an alternate universe of the preexisting AU [[DarkerAndEdgier Under]][[MirrorUniverse fell]], gave rise to the fanfic [[http://archiveofourown.org/works/5734642 Overgrowth]], which itself spawned several more fics.
* ''Franchise/SonicTheHedgehog'':
** This occasionally happens to very popular [=OCs=] and especially fan-children. For example, one artist created a ''[[WesternAnimation/SonicBoom Boom]]''-verse Sonic/Amy daughter named Aurora which has received fanart and fanfics from others. It's especially impressive considering the... infamous reputation of ''Sonic'' Original Characters, even on the website where they are popular.
*** A half-example of this is the Custom Hero feature from ''VideoGame/SonicForces''. It's technically an official character who you can resemble to be any character you want, hence the half-example bit, but the template design of a red wolf is so popular that people are drawing it in spades, and asking SEGA to make him an actual character in and of his own right.
** Someone created a design for Shadow the Hedgehog's long-dead sister-figure Maria Robotnik as a hedgehog. Since then, Maria the Hedgehog is a mainstay of ''Sonic'' fanworks. Try to find Maria fanart or even fanfics, and you'll undeniably find Maria the Hedgehog fanworks too. Some have an ExcusePlot of "What if Maria was reincarnated or resurrected as a hedgehog?" while others just make her a hedgehog just because.
** The most current one of these comes from ''VideoGame/SonicMania''. The boss fight of the [[NostalgiaLevel remade Flying Battery Zone]], a spider, has Eggman hung upside down within the machine. An artist by the username of Alpha Gamboa, however, saw something else entirely and created an image of what they saw. [[https://www.sonicstadium.org/2017/09/meet-omelette-sonic-manias-accidental-new-boss-character/ Meet Eggette (or Omelette, if you prefer)]], a fan character who is essentially to Eggman what Bowser Jr is to Bowser, and has become so popular that fan art, videos and even custom boss themes have been made for her. Not bad for a comical misinterpretation of an upside-down sprite.
** Similar to with Maria, a fan-design for Elise as a FunnyAnimal was created. Almost all Sonic/Elise fanart uses it instead of Elise's canon [[InterspeciesRomance human]] design.

[[folder:Web Comics]]
* ''Webcomic/{{Homestuck}}'' out the wastechute. Fans will create alternate universes, the alternate universes will become popular, people will write fanfics set in the alternative universes... and then there's the ''fanart'' of alternative universes.
** TheGrandBattle is the most notorious in having fanart and other fan stuff based on itself.
** There is genderbent fanart of a cosplay of a fanart of a memetic guy that randomly got into a picture of cosplay.
** ''FanFic/UnwantedFreeUglyTroll'' gets one in ''FanFic/{{Loophole}}''.
** The greater ''RolePlay/ReplayValueUniverse'' currently includes at least one roleplay that draws from a roleplaying-game handbook, which itself was written as a recap of the original freeform roleplay, which in turn is based on ''FanFic/SburbGlitchFAQ''. The author of the Glitch FAQ was apparently so intimidated by the size of his accidental subfandom that he evaporated.

[[folder:Web Original]]
* There is a [[http://www.fanfiction.net/community/Yu-Gi-Oh_The_Abridged_Series_Fanfiction/80293/ whole community]] of people writing fanfiction based on ''WebVideo/YuGiOhTheAbridgedSeries''.
* ''WebVideo/VaguelyRecallingJoJo''
** There's a edit of Jean Pierre Polnareff in VideoGame/{{MUGEN}}, which uses Polnareff's OhCrap face and vanilla.ice's voice and sounds.
** A fan also recreated the scene where they confronted the truck in the Miku Miku Dance 3-D modelling program.
* Much, if not most, of the fanworks surrounding ''WebVideo/DontHugMeImScared'' are based on a particular piece of fanart depicting the Clock and the Notepad [[HumanityEnsues in humanoid form]], and center around their [[{{Flanderization}} flanderized]] {{fanon}} personalities, which really have [[InNameOnly nothing much to do with the original videos]].
* ''LetsPlay/AScotsmanInEgypt'' (a ''VideoGame/TotalWar'' campaign where Scotland takes over the world) has a prequel by a different author in which Egyptian refugees make their new home in Scotland.

[[folder:Western Animation]]
* ''WesternAnimation/AdventureTime'' has an InUniverse example. Ice King wrote a Rule 63 fanfic of the show, in the episode "Fionna and Cake." The episode "Bad Little Boy" has Marceline then writing her own continuation of it, followed by LSP in "The Prince Who Wanted Everything". Taken to its logical conclusion in "Five Short Tables". At the end of the episode the Ice Queen, Ice King's AuthorAvatar, tells how the Ice President is orating a fanfic to Flynn and Jacques about Lynn the Person's adventures. That's at least four layers of story right there.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic,'' due to the inescapable hold over the Internet it had for a while, has had several of these:
** [[https://www.fimfiction.net/story/184594/never-the-final-word Never the Final Word]] is a collection of short stories which are nothing *but* recursive fanfiction - and in at least one case, recursive fanfiction of recursive fanfiction.
** There's the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''FanFic/TheConversionBureau'', which has spawned ''tons'' of [[http://www.equestriadaily.com/2011/04/conversion-bureau-compilation.html fics set in the same setting or a variant thereof]]; no wonder, since it is a very convenient setting for WishFulfillment and satisfying one's desire to live in the story. Its [[HumansAreTheRealMonsters misanthropic]] [[PunyEarthlings tone]] has, however, spawned responses like ''Fanfic/TheConversionBureauNotAlone''. Notably, another Anti-Conversion Bureau fanfic titled ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'' has spawned its own universe, with several tropers among the authors.
** ''FanFic/FalloutEquestria'' has a [[http://fallout-equestria.com/stories number of sub-fics]]. Though that's understating the case: "a number of sub-fics" means ''over 200'' of them. The most notable is ''[[FanFic/FalloutEquestriaProjectHorizons Project Horizons]]'', which has even spawned fanfic of its own.
** ''FanFic/{{Cupcakes}}'' has several alternate ending fanfics written, and a few sequels.
** ''Fanfic/FiveScoreDividedByFour'' has tons.
*** [[http://www.fanfiction.net/s/7284396/1/Rainbow_Leap Rainbow Leap]] is a ''Series/QuantumLeap''-inspired ponyfic wherein Rainbow Dash tries to fly faster than ever [[FandomSpecificPlot with some]] AppliedPhlebotinum [[FandomSpecificPlot from Twilight Sparkle]], and ends up dimension travelling through not only ''Cupcakes'' but several of the fanfics based on it, making it a recursive recursive fanfic.
** ''Fanfic/{{Progress}}'', focused on [[OCStandIn Princess Luna]] adjusting to the changes in Equestrian society over the last thousand years, has inspired ''[[https://docs.google.com/document/d/1CmPYe0YbUOokWei-j_qVp7FeB7EKy7znwOfQZvze6bE/edit?hl=en_GB Luna Vs. Videogames]]'', ''[[http://www.fanfiction.net/s/7377858/1/FiM_Progress_Celestia_vs_Time Celestia vs. Time]]'', and the {{NSFW}} ''[[https://docs.google.com/document/d/1xbFwj2RnKEnN_EqUJ71nHk2DqwD7sYYgSCRkka_5PE8/edit?hl=en_US Luna Vs. Threesome]]''.
*** Luna having an abacus is mentioned in several otherwise unrelated fics.
** ''{{Fanfic/Silent Ponyville|Chronicles}}'' has gone on to spawn at least ''three'' different fanon continuities, some of which have had a [[AscendedFanon significant influence]] on the central continuity. Also has a [[http://silentponyville.deviantart.com/ DeviantART group]] with plenty of fanon works.
** ''The Fanfic/PonyPOVSeries'' has spawned [[http://c8lin-the-hedgie.deviantart.com/art/Discorded-Ponies-HaterSketch-263929712 another Discorded Ponies Series fanfic]] and [[http://teyandee05.deviantart.com/gallery/33150793 The Letters To Ponies]] series.
** ''FanFic/{{Xenophilia}}'' has [[FanFic/IntoTheHedge gone]] on [[FanFic/DividedRainbow to spawn]] a [[http://www.fimfiction.net/story/67231/xenophilia-further-tales significantly]] [[http://www.fimfiction.net/story/115322/xenophilia-advanced large]] [[http://www.fimfiction.net/story/70619/no-room-for-regret number]] of [[http://www.fimfiction.net/story/107717/xenophilia-flesh-and-thorns other]] [[http://www.fimfiction.net/story/57315/the-xenophiles-guide-to-equestria recursive]] [[http://www.fimfiction.net/story/103616/xenophilia-shotglass-oneshots stories.]]
** Also, ''VideoGame/StoryOfTheBlanks'' is referenced as a real occurence in a lot of fanfiction.
** ''[[https://www.fimfiction.net/story/49113/researcher-twilight Researcher Twilight]]'' by NATOStrike is a fun case; it's based on a Tumblr blog, [[http://askresearchertwilight.tumblr.com/ Ask Researcher Twilight]], which itself was based on another fanfic, The Experiments Of Twilight Sparkle.
** A couple of fics are set after ''FanFic/PastSins'', though it's usually just an excuse to use Nyx without being a direct sequel to the story. ''FanFic/RealityChecksNyxverse'' is very much a sequel.
** Each chapter of Fanfic/TheSweetieChroniclesFragments is set in the universe of a different pony fanfic. Stories covered so far include ''Fanfic/OfMaresAndMagic, Nightmares Don't Last Forever, The Light Never Goes Out, Fanfic/OnACrossAndArrow, Fanfic/FalloutEquestriaPinkEyes, Fanfic/TheBestNightEver'' and ''Fanfic/TheImmortalGame'', and the second April Fools episode takes a turn through several of the author's own other stories. Furthermore, ''Fanfic/ThisPlatinumCrown'' (the sequel to ''The Best Night Ever'') is said to treat the events of that chapter as canon.
** ''FanFic/FriendshipIsOptimal'' has a group, [[http://www.fimfiction.net/group/1857/the-optimalverse “The Optimalverse”]], for its fanfiction. Several stories also have their own pages, including ''FanFic/FriendshipIsOptimalAlwaysSayNo'', ''FanFic/FriendshipIsOptimalCaelumEstConterrens'', ''FanFic/FriendshipIsOptimalTheLawOfficesOfArtemisStellaAndBeat'' and ''FanFic/LetsPlayEquestriaOnline''.
** ''TheLifeAndTimesOfAWinningPony'' has its own group to handle spinoffs and derivative works.
** And ''[[Fanfic/EakinsHardReset Hard Reset]]'' picked up a fanfic picking up ... um ... somewhere in the mess. ''Hard Reset 2: Reset Harder'' splits off on the premise that why should Twilight be the only one who gets the ''Film/GroundhogDay'' treatment?
** Topping everything off, we have fanfics about the ''canon in-universe'' fanfic that the canon Rainbow Dash was writing in ''Spike At Your Service''.
** ''Fanfic/CrisisOfInfiniteTwilights'' is a rare one that is a recursive fanfiction that has also created Recursive Fanfictions.
*** The story itself includes appears of ''Fanfic/FaithandDoubt Faith and Abstract Twilight'', Nyx, and Lunaverse Twilight.
*** It has also caused the creation of several other fics, including ones based on Twiley and Green Lantern Twilight.
** ''Fanfic/AllAmericanGirl'' likewise has [[http://www.fimfiction.net/group/202027/the-allamerican-girl-saga its own group]], with a handful of third-party stories set in its universe.
** ''Fanfic/TheDemesneOfTheReluctantTwilightSparkle'', in addition to being inspired by the denouement of ''[[http://www.fimfiction.net/story/144948/the-princess-of-books The Princess of Books]]'' (with which it is not otherwise in continuity), spawned ''[[http://www.fimfiction.net/story/225112/the-quiet-equestrian The Quiet Equestrian]]'', which expands on the [[spoiler:civil war]] subplot.
** ''Fanfic/SevenDaysInSunnyJune'' now has one, ''You Are the Woman'', about a girl in love with Sunset Shimmer.
** ''FanFic/TheAssassinationOfTwilightSparkle'' has inspired three. One starring [[http://www.fimfiction.net/story/221967/worth-her-time Sweetie Belle,]] one starring an OriginalCharacter named [[http://www.fimfiction.net/blog/425725/hateful-mirror-a-new-story-by-yours-truly Breaking Dawn,]][[note]]Warning: Breaking Dawn is a LargeHam.[[/note]] and an alternete version titled [[FanFic/VengeanceOfTheStar Vengeance of the Star]] where Spike is killed and Twilight is forced to watch. [[spoiler:[[CaptainObvious It doesn't end well for Spike...]] [[MamaBear Even more so for the assassins.]]]]
** ''WebVideo/FriendshipIsWitchcraft'' fanart is not uncommon however fanfics are. Despite this, Sweetiebot appears in several fanfics. Often times the writers haven't seen ''[=FiW=]'' but they know of Sweetie Belle as a robot from elsewhere.
* The hatefic ''FanFic/MyBravePonyStarfleetMagic'' has inspired a deconstruction named ''Fanfic/FallOfStarfleetRebirthOfFriendship''.
* ''WesternAnimation/{{Daria}}'':
** The fanfic ''Fanfic/GodSaveTheEsteem'' has spawned a prequel, ''Moving Pictures'', as well as numerous other stories up to and including the obligatory lesbian SlashFic. Subverted as they both started being written at around the same time, so it's more likely that it's two different, but similar series that ended up sharing their continuity.
** The ''Daria'' fandom also has a lot of {{Original Character}}s who pop up in other people's stories, even if the fanfics aren't supposed to share continuity; usually their creators give the green light for their use, or they're included as an in-joke. Popular ones include Veronica, a hypothetical [[CainAndAbelAndSeth third Morgendorffer sister]], and Danielle Todds, a [[LesYay female lover interest]] for [[LovableLibby Quinn]] if you don't want to use a canon character.
* The ''WesternAnimation/KimPossible'' fanfic ''Fanfic/ASmallPossibility'', with the author's given permission, has spawned many a Kim/Shego fanfic featuring their spawn from the original, Kasy Ann and Sheki Go.
* The fanfic ''{{Fanfic/Strays}}'', hosted in the ''WesternAnimation/YoungJustice'' KinkMeme, has several future-fics set to it and attached its thread despite the story still being in its early stages and in the process of being fleshed out. There is also fanart for it, featuring the costume designs for the Batkids' new hero identities.
* [[http://kateboat.deviantart.com/art/Fixed-331610708 This]] ''WesternAnimation/{{Superjail}}'' one-shot fic is actually a sequel/epilogue to ''[[http://www.fanfiction.net/s/6079358/1/Fix-You Fix You]]'', written with the original author's given permission of course.
** ''[[http://www.fanfiction.net/s/9742382/1/Et-Mundus-Eos Et Mundus Eos]]'' is a sequel to ''Fanfic/ExtendedStay'', written with the original author's consent.
* ''WesternAnimation/PhineasAndFerb'' fandom has a NextGenFic pairing for which many people have taken to writing fanfic, Thomas Fletcher (son of Ferb and Vanessa) and Marie Garcia-Shapiro Flynn (daughter of Phineas and Isabella). They have their own PortmanteauCoupleName (Thomarie) and a ton of art for them on Website/DeviantArt. There's even artwork of them signed by the Latin-American voice actors for the show.
* In the ''WesternAnimation/GoofTroop'' fandom, there are several stories based on one fan's extensive mythos surrounding an AlternativeCharacterInterpretation of [[JerkJock Bradley Uppercrust]]'s backstory (specifically one that makes him a JerkassWoobie); ''[[http://www.fanfiction.net/s/8439426/1/Turning-Back-Time Turning Back Time]]'' is one such story that [[AdaptationDisplacement seems to be better-known than anything the original author did]].
* ''WesternAnimation/GravityFalls'' has the "Reverse Pines [=AU=]". What started as just a WhatIf has turned into dozens of fanfics, fanarts, and fanvids. The concept revolves around a role reversal where the Pine twins are in Gideon's role, while Gideon and Pacifica trade places with Dipper and Mabel.
* ''Fanfic/UniverseFalls'', a FusionFic of ''WesternAnimation/GravityFalls'' and ''WesternAnimation/StevenUniverse'', has inspired a few fanfics of its own, based on [[AlternateUniverseFic fan AUs]] from both franchises, such as Reverse Pines/Steven Diamond, Gravity Rises/Momswap, or the original author's own "UF Swap" alternate universe where Steven is a normal kid and Dipper and Mabel are the human/gem hybrids.
* ''Fanfic/ShadowOfTheGuardian'' by Creator/ConveyusPrime is based on Creator/{{Shebakoby}}'s FanFic, notably ''Fanfic/PrisonerOfDestiny'' and ''Fanfic/TheBigCaptureOf19992006'', and it has become a shared FanVerse.
* This has happened a number of times in the ''WesternAnimation/ChipNDaleRescueRangers'' fandom.
** Rachel's ''[[http://rrdatabase.cdrrhq.ru/written/rachel_gloess/CG.html Caretaker]]'' is a sequel to Matt Plotecher's movie script ''[[http://rrdatabase.cdrrhq.ru/written/matt_plotecher/Sumouze.txt Somemouse to Watch Over Me]]''.
** The instant popularity of ''Fanfic/TheNowakverse'' and its [[ByronicHero main original character]], starting with ''Under the Bridge'' already, has led to a whole number of fics by different authors set in the same universe.
** The J.A.M. liked The Enduring Man-Child's ''[[https://www.fanfiction.net/s/3948111/1/Consummation Consummation]]'', itself a sequel to the same author's ''[[https://www.fanfiction.net/s/3924855/1/Home-is-Where-You-Hang-Upside-Down Home Is Where You Hang Upside Down]]'', so much that he wrote [[https://www.fanfiction.net/s/6090454/1/LSCnDBSDATK-version-2 a tangent with two alternative endings]] and a highly-acclaimed sequel to each of these, ''[[https://www.fanfiction.net/s/6345207/1/Death-of-a-Comedian-version-2 Death of a Comedian]]'' and ''[[https://www.fanfiction.net/s/6442104/1/I-Dream-of-the-New-Ranger-version-2 I Dream of the New Ranger]]''.
** ''Fanfic/TheMidnightverse'' got one big fan named RR-Crusader who not only joined the forum where it was posted to tell the author how much he liked it, but even wrote a fic in the same universe, ''Knight Rangers'', a {{Crossover}} with ''Series/KnightRider''.
** Tropes/MidnightMan himself included the two main original characters from [=BOC42=]'s ''[[https://www.fanfiction.net/s/2923232/1/Closer-Than-a-Brother Closer Than a Brother]]'' in the ''Theater/DinnerForOne'' parody ''[[http://www.theacorncafe.org/phpbb/viewtopic.php?t=15177 Dinner For One Mouse]]''. From the idea to getting [=BOC42=]'s consent to publishing the finished work, this project took only a few hours on New Year's Eve, 2006.