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* The ''WesternAnimation/ThomasAndFriends'' fandom has grown increasingly famous for taking the more obscure parts of the franchise's lore and generic characters and expanding upon them, and the franchise has plenty of loose ends and [[FlatCharacter]]s for fans to work with.
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** In this show Rico, is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.
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** In this show Rico, show, Rico is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.
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* In ''WesternAnimation/ThePenguinsOfMadagascar,'' Rico is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.
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* ''WesternAnimation/ThePenguinsOfMadagascar,''
** In''WesternAnimation/ThePenguinsOfMadagascar,'' Rico this show Rico, is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.canon.
** [[spoiler: How the Penguins (especially Skipper) are gonna react when they learn that Manfredi & Johnson are still alive?]]
** Both Uncle Nigel and Buck Rockgut mention the existence of a general Penguin HQ besides the one seen in the series, which means that there are other penguin squadrons out there. How they would look like, and does Uncle Nigel and Rockgut are members of one of them?
** In
** [[spoiler: How the Penguins (especially Skipper) are gonna react when they learn that Manfredi & Johnson are still alive?]]
** Both Uncle Nigel and Buck Rockgut mention the existence of a general Penguin HQ besides the one seen in the series, which means that there are other penguin squadrons out there. How they would look like, and does Uncle Nigel and Rockgut are members of one of them?
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* ''WesternAnimation/TheSimpsons'': The "Treehouse Of Horror XXXIV" segment "[=Ei8ht=]", which partly parodies ''Film/{{Film/Se7en}}'', has a clear PointOfDivergence from a classic episode ("Cape Feare") as its premise, which opens up a lot about what happened between the alternate "Cape Feare" and the main body of the segment. It helps that the premise eschews the show's typical ComicBookTime to have the events of "Cape Feare" really occurring on the date the episode aired (in 1993), so that its 2023 segments deal with a Lisa who's aged in real time from there, a timeline preferred by fans who have trouble seeing iconic 90s kids Bart, Lisa and Maggie as smartphone-wielding modern-day youngsters. The segment also peaked the interest of many fans just by being an alternate take on what was otherwise a normal ''Simpsons'' episode, opening up potential story ideas that can be had by twisting other episodes of the show, with many wishing it was written as a full-length episode like "[[Recap/TheSimpsonsS34E5NotIt Not It]]", the show's spoof of ''Film/IT2017'', which aired the previous season.
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* ''WesternAnimation/TheSimpsons'': The "Treehouse "[[Recap/TheSimpsonsS35E5TreehouseOfHorrorXXXIV Treehouse Of Horror XXXIV" XXXIV]]" segment "[=Ei8ht=]", which partly parodies ''Film/{{Film/Se7en}}'', has a clear PointOfDivergence from a classic episode ("Cape Feare") as its premise, which opens up a lot about what happened between the alternate "Cape Feare" and the main body of the segment. It helps that the premise eschews the show's typical ComicBookTime to have the events of "Cape Feare" really occurring on the date the episode aired (in 1993), so that its 2023 segments deal with a Lisa who's aged in real time from there, a timeline preferred by fans who have trouble seeing iconic 90s kids Bart, Lisa and Maggie as smartphone-wielding modern-day youngsters. The segment also peaked the interest of many fans just by being an alternate take on what was otherwise a normal ''Simpsons'' episode, opening up potential story ideas that can be had by twisting other episodes of the show, with many wishing it was written as a full-length episode like "[[Recap/TheSimpsonsS34E5NotIt Not It]]", the show's spoof of ''Film/IT2017'', which aired the previous season.
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* ''WesternAnimation/TheSimpsons'': The "Treehouse Of Horror XXXIV" segment "[=Ei8ht=]", which partly parodies ''Film/{{Film/Se7en}}'', has a clear PointOfDivergence from a classic episode ("Cape Feare") as its premise, which opens up a lot about what happened between the alternate "Cape Feare" and the main body of the segment. It helps that the premise eschews the show's typical ComicBookTime to have the events of "Cape Feare" really occurring on the date the episode aired (in 1993), so that its 2023 segments deal with a Lisa who's aged in real time from there, a timeline preferred by fans who have trouble seeing iconic 90s kids Bart, Lisa and Maggie as smartphone-wielding modern-day youngsters. The segment also peaked the interest of many fans just by being an alternate take on what was otherwise a normal ''Simpsons'' episode, opening up potential story ideas that can be had by twisting other episodes of the show, with many wishing it was written as a full-length episode like "[[Recap/TheSimpsonsS34E5NotIt Not It]]", the show's spoof of ''Film/IT2017'', which aired the previous season.
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* ''WesternAnimation/{{Dinotrux}}:
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* ''WesternAnimation/{{Dinotrux}}:''WesternAnimation/{{Dinotrux}}'':
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* ''WesternAnimation/{{Dinotrux}}:
** The show premise of dinosaurs mixed with vehicles offers so much potential for how particuliar species of dinosaurs (or other prehistoric creatures) will look like as Dinotrux. For example: how the show's version of ''Spinosaurus'' looks like?
** The fates of Blayde, Splitter, Pounder and Gold Trux who had never appeared again in the show.
** The show premise of dinosaurs mixed with vehicles offers so much potential for how particuliar species of dinosaurs (or other prehistoric creatures) will look like as Dinotrux. For example: how the show's version of ''Spinosaurus'' looks like?
** The fates of Blayde, Splitter, Pounder and Gold Trux who had never appeared again in the show.
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* ''WesternAnimation/TheMagicSchoolBus'' has a pretty devoted fanfic community, largely because of all the tantalizing questions about the characters that it leaves unanswered. Where exactly did [[InexplicablyAwesome Miss Frizzle]] come from, and how did she get her famous bus? What sort of relationship did she have with [[WesternAnimation/TheMagicSchoolBusRidesAgain her sister Fiona]] before she replaced her as teacher? Are there any other teachers at the kids' school, and are they all as... "interesting" as Miss Frizzle? How did the kids handle adolescence and adulthood? And what were things ''really'' like [[CatchPhrase at Phoebe's old school]]?
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* ''WesternAnimation/TheMagicSchoolBus'' has a pretty devoted fanfic community, largely because of all the tantalizing questions about the characters that it leaves unanswered. Where exactly did [[InexplicablyAwesome Miss Frizzle]] come from, and how did she get her famous bus? What sort of relationship did she have with [[WesternAnimation/TheMagicSchoolBusRidesAgain her sister Fiona]] before she replaced her as teacher? Are there any other teachers at the kids' school, and are they all as... "interesting" as Miss Frizzle? How did the kids handle adolescence and adulthood? And what were things ''really'' like [[CatchPhrase [[MadLibsCatchphrase at Phoebe's old school]]?
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** Wendy's mother is simply 'no longer with her family'. What does that mean? What effect does her absence have on Wendy or her family?
** Pacifica and Gideon are both beginning to embark upon their redemption journeys.
** Pacifica and Gideon are both beginning to embark upon their redemption journeys.
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** The fact that [[spoiler: as a [[OurTitansAreDifferent Titan]], King will outlive almost everyone else on the show, and will becomes a towering behemoth once he’s fully grown. What will King look and be like as an adult? How will his size and knowledge of the past impact the people of the Boiling Isles in the distant future]]?
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** The fact that [[spoiler: as a [[OurTitansAreDifferent Titan]], King will outlive almost everyone else on the show, and will becomes become a towering behemoth once he’s fully grown. What will King look and be like as an adult? How will his size and knowledge of the past impact the people of the Boiling Isles in the distant future]]?
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FanficFuel in WesternAnimation.
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FanficFuel in WesternAnimation.
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[[index]]
* ''FanficFuel/InfinityTrain''
* ''FanficFuel/MyLittlePonyFriendshipIsMagic''
[[/index]]
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FanficFuel in WesternAnimation.
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FanficFuel in WesternAnimation.
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* ''WesternAnimation/TheOwlHouse'': The GrandFinale offers multiple of them:
** [[spoiler: There is a three-year TimeSkip that reveals that Luz has been frequently navigating the human and demon realms. Now that the human and demon realms can easily be accessed to each other, this opens up many possibilities of humans and demons exploring each other’s realms]].
** [[spoiler: The Collector decides to adventure into space at the end of the series. What kinds of adventures will he get up to]]?
** The fact that [[spoiler: as a [[OurTitansAreDifferent Titan]], King will outlive almost everyone else on the show, and will becomes a towering behemoth once he’s fully grown. What will King look and be like as an adult? How will his size and knowledge of the past impact the people of the Boiling Isles in the distant future]]?
** [[spoiler: There is a three-year TimeSkip that reveals that Luz has been frequently navigating the human and demon realms. Now that the human and demon realms can easily be accessed to each other, this opens up many possibilities of humans and demons exploring each other’s realms]].
** [[spoiler: The Collector decides to adventure into space at the end of the series. What kinds of adventures will he get up to]]?
** The fact that [[spoiler: as a [[OurTitansAreDifferent Titan]], King will outlive almost everyone else on the show, and will becomes a towering behemoth once he’s fully grown. What will King look and be like as an adult? How will his size and knowledge of the past impact the people of the Boiling Isles in the distant future]]?
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** In the episode, “Timephoon!” Louie accidentally sends everyone (except himself) to different time periods after he accidentally created a TemporalParadox. An earlier episode, “The Outlaw Scrooge [=McDuck=],” is a flashback of Scrooge and Goldie in the old west, and present day Gyro Gearloose is with them, with him even mentioning that he’s stuck there due to a time traveling accident. This implies that the two events are connected. After everyone gets back to the present day, Launchpad mentions that [[NoodleIncident he saw]] [[TheEndOfTheWorldAsWeKnowIt how the world ends]]. Where did everyone else end up during that time, and what kinds of adventures did they go on?
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* ''WesternAnimation/DuckTales2017'':
** This iteration of [[WesternAnimation/DarkwingDuck Darkwing Duck]]. After the two-parter “LetsGetDangerous,” many fans were hoping that his show would get rebooted as well. The episode ends with Darkwing taking Launchpad and Gosalyn under his wing, just like in the original series. What kinds of adventures would they go on in this day and age?
** The same episode introduces the [=RamRod=]: an invention that [[spoiler: acts as a portal to other dimensions. Not only that, but according to Taurus, every fictional universe is an alternate reality that can be accessed using the [=RamRod=].]] This leads to all sorts of crossover potential.
** This iteration of [[WesternAnimation/DarkwingDuck Darkwing Duck]]. After the two-parter “LetsGetDangerous,” many fans were hoping that his show would get rebooted as well. The episode ends with Darkwing taking Launchpad and Gosalyn under his wing, just like in the original series. What kinds of adventures would they go on in this day and age?
** The same episode introduces the [=RamRod=]: an invention that [[spoiler: acts as a portal to other dimensions. Not only that, but according to Taurus, every fictional universe is an alternate reality that can be accessed using the [=RamRod=].]] This leads to all sorts of crossover potential.
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* ''WesternAnimation/WorkItOutWombats'': The fact that the wombat kids don't seem to have any parents opens up a wealth of fanfiction opportunities explaining their absence.
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* [[spoiler: Ford has spent 30 years trapped in other dimensions.]] What kinds of adventures did he go one during all of that time?
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* [[spoiler: Ford has spent 30 years trapped in other dimensions.]] What kinds of adventures did he go one during all of that time?
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** Ivy mentions discovery of a new continent "untouched by frog, newt or toad hands", with at least 3 characters, [[spoiler: Sprig, Ivy and Grime]] eager to explore it. It's a perfect setup for all kinds of crossovers.
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** Ivy mentions discovery of a new continent "untouched by frog, newt or toad hands", with at least 3 characters, [[spoiler: Sprig, Ivy and Grime]] eager to explore it. It's a perfect setup for all kinds of crossovers.crossovers, especially [[WesternAnimation/TheOwlHouse that one]].
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* ''WesternAnimation/AdventureTime'':
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
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* ''WesternAnimation/AdventureTime'':
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
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** The fact that Anne[[spoiler:, upon dying at age 91, will become the replacement of the omnipotent GuardianOfTheMultiverse, basically becoming a god]].
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** The fact that Anne[[spoiler:, upon Anne, [[spoiler:upon dying at age 91, will become the replacement of the omnipotent GuardianOfTheMultiverse, basically becoming a god]].
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** Two major examples of this: How the events in the show affected Dipper and Mabel's lives at home after summer vacation ended, and the adventures that [[spoiler:the Stan twins]] got up to after the show's end.
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** Two Three major examples of this: How the events in the show affected Dipper and Mabel's lives at home after summer vacation ended, and the adventures that [[spoiler:the Stan twins]] got up to after the show's end. end, and the kinds of adventures that Soos and [[spoiler: Melody]] went on now that [[spoiler: Soos owns the Mystery Shack.]]
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* The final episode of ''WesternAnimation/{{Amphibia}}'' drops multiple ones:
** Ivy mentions discovery of a new continent "untouched by frog, newt or toad hands", with at least 3 characters, [[spoiler: Sprig, Ivy and Grime]] eager to explore it. It's a perfect setup for all kinds of crossovers.
** Anne, Sasha's and Marcy's lives after the series' finale, either leading towards the WhereAreTheyNow ending or going forward.
** The fact that Anne[[spoiler:, upon dying at age 91, will become the replacement of the omnipotent GuardianOfTheMultiverse, basically becoming a god]].
* ''WesternAnimation/AdventureTime'':
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
* ''WesternAnimation/AvatarTheLastAirbender'':
** The fate of Ursa. The show left a few other minor plot threads hanging, but that's the one that really got everyone upset, and speculating. It was resolved in ''ComicBook/AvatarTheLastAirbenderTheSearch'', though it [[BrokenBase divided]] fans and critics.
** And, you know, a century-long war, with plenty of rich, undeveloped ground for exciting battles and stuff. And one thousand Avatars in the history of the world, too.
** The SequelSeries, ''WesternAnimation/TheLegendOfKorra'', is filled to the brim with potential fanfic hooks. Not only is the show set eight decades after ''WesternAnimation/{{Avatar|TheLastAirbender}}'', but there are also several smaller {{time skip}}s within the show itself, including a whopping 3-year gap between Books Three and Four. Also, ''Korra'''s comparatively faster pace means that a lot of background details that aren't directly relevant to the plot are left open-ended, including [[WorkingWithTheEx the specifics of past relationships]], the exact details of villains' [[MysteriousPast rises to power]], and [[SequelNonEntity even the fates of some of the main characters of The Last Airbender]]. Considering the creators are [[TeasingCreator well aware]] of how their show's fandom operates, this is almost undoubtedly intentional. In fact, in the Book Four commentary, they told people to write fanfic about Mako's relationship with Zuko's granddaughter because they couldn't fit her into the show.
** Another example for ''Korra'' is alternative starting points for Korra and Asami's relationship. In Book One, Asami's father is an Equalist, an anti-bending revolutionary. A popular fanfic origin is one in which Asami fully serves them rather than turning on her father and siding with Korra. This generally involves Asami attempting to seduce Korra. A similar situation occurs with Korra having been captured by the Red Lotus as a child, at which point she and Asami are on opposite sides for a different reason, until they inevitably find each other.
* Since the ''WesternAnimation/{{Beetlejuice}}'' cartoon has an almost completely different premise than [[Film/{{Beetlejuice}} the movie]] did, one of the most common sources of fanfic fuel involves figuring out how the cartoon versions of Beetlejuice and Lydia met and became friends. (There ''is'' a vague back story given in [[ComicBook/{{Beetlejuice}} the comic book adaptation]], but it's unclear whether this is intended to be canon to the show.) The other question fic writers like to try to answer is, in the absence of a proper series finale, what became of the duo's relationship in the future?
* ''Franchise/Ben10'':
** There's plenty of AllThereInTheManual information on the series' background, including official bios for each alien form used by Ben, providing info about these aliens' species, planets and for some of them cultures, with only a few of them having been actually explored in the various entries. This leaves plenty of material for fans to create their own alien [=OCs=] or develop further the various planets. In addition, Ben is stated to have access to more than one million aliens on the Omnitrix, leaving a huge gap for fans to fill with their own fan-made aliens.
** In ''WesternAnimation/Ben10AlienForce'', the whole Plumber's Kid is based around the idea that a lot of [[HalfHumanHybrid alien-human hybrids]] exist on Earth due to former Plumbers mating with humans. This makes for an excellent justification for fans to create their own half-alien OC.
* ''WesternAnimation/ChipNDaleRescueRangers'' leaves several questions unanswered and thereby FanFic writers with a desire to answer them.
** Monterey Jack is the only Rangers whose parents we get to know. Chip's, Dale's and Zipper's families aren't even hinted at. But in Gadget's case, her father, Geegaw Hackwrench, is mentioned enough to fuel the viewers' curiosity. He is only ever seen in a framed picture in "To the Rescue" Part 3, and Gadget mentions that she has lost him more than one year prior to the events of this episode. What exactly happened to him remains unknown. In a show that has its fair share of mystery and thrillers, this just has to fuel the audience's curiosity.
** Speaking of Geegaw, he and Monty have been in some NoodleIncident in Zanzibar which involved a cheese bread and greatly upset Geegaw. While Monty tells a lot of tales from his past which may or may not be true, this is the one that the Rangerphiles really want to know more about.
** Gadget's mother remains entirely unmentioned. Neither Monty nor Gadget ever talks about her. But if ''CDRR'' fanfic writers have to solve the mystery of Geegaw's demise, it's only natural that they have to write something about her mother as well.
** Then there is "Good Times, Bat Times", the episode in which Dale ends up with Foxglove as his girlfriend. It's often considered the chronologically last episode (there is no defined chronology throughout a show that has the pilot in Season 2). Either way, we don't find out how things go on with Dale in a relationship with a cute pink bat (unless you count [[ComicBook/ChipNDaleRescueRangers the Boom! comics]] as {{Canon}}). Will Foxy join the Rangers? What'll Chip do, now that he doesn't have any competition for Gadget anymore?
** How come there's a mouse in Hawaii that [[{{Doppelganger}} looks pretty much identical to Gadget]]?
* ''WesternAnimation/DannyPhantom'':
** [[FutureMeScaresMe Dark Danny]]'s return, which the show teased at the end of the character's debut episode, but never came into fruition due to the show ended sooner than planned.
** Both creator Butch Hartman, and head writer for the first two seasons Steve Marmel, wanted to do a plot where [[OppositeSexClone Danielle "Dani" Phantom]] would be introduced to Danny's family and adopted, but didn't have time to properly setup such a development. Naturally, fans like exploring this possibility in fan works.
** Fans often wonder what, exactly, happened when Danny first gained his powers, as there's a month between the FreakLabAccident accident and the start of the show; the accident itself is only loosely depicted in the ExpositoryThemeTune and in the episode "Memory Blank" (wherein the characters ''recreate'' it), and we don't see what happened in that first month at ''all''.
** The show in general raises some questions about the nature of ghosts and the Ghost Zone that are never given answers (or [[FanDislikedExplanation ones are just plain unsatisfying]]), leading to fans [[EpilepticTrees come up with their own creative answers for]].
* ''WesternAnimation/{{Daria}}'''s BizarroEpisode, "Depth Takes a Holiday," is often relegated to FanonDiscontinuity, but other times fans wonder: if Lawndale actually has an interdimensional portal, couldn't that set up all sorts of sci-fi/fantasy fics, not to mention crossovers?
* Franchise/DCAnimatedUniverse:
** Many people wondered what happened between the timelines of ''[[WesternAnimation/JusticeLeague Justice League Unlimited]]'' and ''WesternAnimation/BatmanBeyond''. Fifty years had passed and many of the Justice Leaguers are gone. They've also wondered about the circumstances which led to Warhawk, son of Hawkgirl and Green Lantern, being conceived and born.
** Not to mention the "[[NoodleIncident Near-Apocalypse of '09]]".
* ''WesternAnimation/{{Gargoyles}}'' is an absolute treasure trove of this, thanks to [[TooGoodToLast its rather abrupt cancellation]], and [[WhatCouldHaveBeen the creator's extremely detailed notes about the planned future of the mythos]].
** There was going to be a ''Dark Ages'' prequel spinoff focused on the early days of the Wyvern Clan in Medieval Scotland, when Goliath and Demona were still young lovers fighting under Hudson's guidance. Not to mention a planned ''Gargoyles: 2198'' SequelSeries, with the cast's descendants fighting off an alien invasion (first hinted at in "Sentinel") in the far future. Both concepts practically beg for fanfiction.
** The released notes for ''2198'' confirm (among other tidbits) that Elisa and Natsilane's descendants would eventually have gotten together, that Lexington and Xanatos would eventually have merged corporations, and that a line of robots based on Lexington would eventually have entered production. All dynamite ideas for fanfiction.
** After fans pestered him about it in his "Ask Greg" Q&A forum, Creator/GregWeisman confirmed that he did have plans to work characters from [[Creator/WilliamShakespeare Shakespeare]]'s ''Theatre/TheTempest'' into the ''Gargoyles'' mythos. How would they have figured in the story? How would Weisman have portrayed them? How different would they have been from their literary counterparts? Note that the ''Gargoyles'' universe already includes sorcerers, Fae spirits, monstrous humanoids, volatile court politics, and [[DoesThisRemindYouOfAnything an enchanted island fought over by various factions of sorcerers and spirits]]; a retelling of ''The Tempest'' practically writes itself.
** After Demona and Macbeth were made immortal by the same magic spell, they canonically lived through over 900 years of human history--barely any of which has actually been seen in canon. What adventures did they get up to while Goliath and his pals were still sleeping in statue-form?
** [[GreatOffscreenWar The interstellar war between the N'Kai and the Space-Spawn]].
** Alexander Xanatos's time studying magic under Puck's tutelage.
** Alex Xanatos taking up the mantle of Fox from his mother (a possible future plot point that was hinted at in "Future Tense").
** Queen Titania's relationship with Halcyon Renard.
** Peter Maza's relationship with the trickster spirit Coyote (the specific nature of which was left rather vague in-show).
** The careers of Canmore's descendants who took up the mantle of [[LegacyCharacter "The Hunter"]] after him.
** [[WordOfGay Lexington]] acknowledging and coming to terms with his homosexuality.
** The lives and adventures of the gargoyles in the Wyvern Clan [[WeHardlyKnewYe who were all killed off in the pilot episode]] [[DeathByOriginStory shortly after being introduced]], and also those of Angela's rookery brothers and sisters back on Avalon.
** The history and true purpose of the Illuminati.
** The Redemption Squad's battle with the Illuminati after the cancellation of the ''Gargoyles: Bad Guys'' spinoff.
** [[TheLancer Brookyln]]'s adventures traveling through time with the Phoenix Gate (which were going to be the basis of the proposed ''Gargoyles: Timedancer'' spinoff). All we really know from the comics is that his adventures involved [[EyepatchOfPower losing an eye]], traveling to China and Japan, meeting his loyal pet companion Fu-Dog and his true love Katana, and eventually having a son named Nashville (with a second unhatched child nicknamed "Eggwardo" on the way). Whatever he got up to while time-traveling, he apparently had to seriously sharpen his combat skills in order to survive; when he's seen again, he's sporting an armored breastplate and packing a gun, a katana, and a pair of daggers.
* ''WesternAnimation/GravityFalls'':
** Two major examples of this: How the events in the show affected Dipper and Mabel's lives at home after summer vacation ended, and the adventures that [[spoiler:the Stan twins]] got up to after the show's end.
** Stan's ten years on the road after [[spoiler:getting disowned and separated from Ford]] have increasingly become popular, especially for DarkFic and AlternateUniverseFic.
* ''WesternAnimation/HeyArnold'':
** The series was supposed to end with ''The Jungle Movie'', which would have seen Arnold and Helga admit their true feelings for each other, and would have seen Arnold finding his parents, but the show was cancelled and the movie was put on the back-burner. However, creator Creator/CraigBartlett has revealed bits and pieces of the finale's intended plot, and the fanfic community has responded in kind. With Creator/{{Nickelodeon}} producing it as [[WesternAnimation/HeyArnoldTheJungleMovie a TV movie over a decade later]], the fans can now see how similar their takes on the story were to the final film.
** Ditto for Bartlett's unproduced spinoff ''The Patakis'', about the home life of a teenaged Helga. The pilot script was apparently too dark for Creator/{{Nickelodeon}}, but Bartlett has revealed enough details for the fanfic writers to use. Unlike ''The Jungle Movie'', Nickelodeon has not given this the green light yet.
* ''WesternAnimation/InfinityTrain'':
** The train itself. Since it already has the mysterious ability to travel through dimensions, fans like to imagine that humans from the show's Earth aren't the only passengers on the train, and that it can be host to beings (both human and non-human) from various different timelines and dimensions. Cue half of the fics for the fandom consisting of {{crossover}}s with other works.
** The other half are mostly {{Continuation}}s: what is [X]'s life like now that they're off the train? Creator Owen Dennis has stated he had no interest in deeply exploring the lives of characters after they've gotten their exit, which only gives more reason for fanfic authors to do the job themselves and imagine how each season's protagonists are doing now that they're back on Earth and have to deal with not having reflections, being made of metal, or just their lingering emotions about spending weeks/months/years of their lives on the locomotive.
* ''WesternAnimation/InvaderZim'':
** The show contains a surprising amount of background detail upon which numerous fans can and have elaborated, ranging from an interstellar war to Irken reproduction. Especially since the show was canceled just as it was developing a MythArc, and the creators have revealed their basic plans to fans.
** The "Battle Void" StoryArc from the [[ComicBook/InvaderZimOni comic book continuation]] features a series of Zims from {{Alternate Universe}}s, most of them very bizarrely different from Zim himself. This has proven very inspirational ground for fanfic writers, as has the StartOfDarkness for the arc's main antagonist, [[spoiler:Zib, an alternate Dib who defeated his Zim then [[FusionDance merged]] with his PAK]].
* ''WesternAnimation/{{Jellystone}}'': An unorthodox example; fans of the show are fond of redesigning characters from other media, particularly Funny Animal ones, in C.H. Greenblatt's style and calling them the Jellystone versions of them.
* ''WesternAnimation/JimmyTwoShoes'':
** Who is Beezy's mother/Lucius' wife, and what happened to her? There ''was'' a Mrs. Heinous in the early stages of the series' development, but in the final product, she's Lucius' RichBitch girlfriend Jez.
** How did Jimmy and Heloise end up in Miseryville? This was actually addressed in [[WhatCouldHaveBeen the original pitch]] (which was that Jimmy and Heloise died and went to Hell -- by accident in the former's case), but since the final product makes its canonicity dubious, fans have often created their own theories in place, often with elements from the original concept.
* ''WesternAnimation/KimPossible'' has some common jumping-off points:
** Graduation from high school was [[GraduateFromTheStory the ending for the series]] but presumably a new beginning for Kim and Ron. Quite a few fics follow their adventures to college and beyond to adult life.
** A new beginning is also suggested for Dr. Drakken and Shego, who end up [[EnemyMine helping save the world]] instead of menacing it and apparently [[LastMinuteHookup become a couple]].
** The planet Lorwardia was introduced with just enough information to suggest that it's the [[PlanetOfHats homeworld of a]] ProudWarriorRace.
* ''WesternAnimation/TheLoudHouse'' episode "The Loudest Mission" gives us two -- 1) Who's going to buy the Santiago residence? 2) What adventures will Ronnie and Bobby have with their relatives? The latter question was eventually answered by the spinoff series ''WesternAnimation/TheCasagrandes''.
* ''WesternAnimation/TheMagicSchoolBus'' has a pretty devoted fanfic community, largely because of all the tantalizing questions about the characters that it leaves unanswered. Where exactly did [[InexplicablyAwesome Miss Frizzle]] come from, and how did she get her famous bus? What sort of relationship did she have with [[WesternAnimation/TheMagicSchoolBusRidesAgain her sister Fiona]] before she replaced her as teacher? Are there any other teachers at the kids' school, and are they all as... "interesting" as Miss Frizzle? How did the kids handle adolescence and adulthood? And what were things ''really'' like [[CatchPhrase at Phoebe's old school]]?
* ''WesternAnimation/MiraculousLadybug'':
** Are Marinette and Adrien protected (by their miraculouses) against Hawk Moth's powers? If not, their akumatized selves are often represented, and nicknamed White Cat and Miss Fortune, respectively. However, the episode "Zombizou" seems to confirm that they aren't protected against akumatization. Furthermore, the akumatized Chat Noir is canonically named Chat Blanc, which is French for "White Cat".
** Many fanfics have them revealing their secret identities to each other, which has yet to happen in canon, though they have come close a few times.
** [[spoiler:What is the Peacock Miraculous doing in Gabriel Agreste's safe? Fans speculate that either he or his wife used to be the holder, and their costumes are often represented.]]
** In "Chameleon", [[spoiler:Marinette's friends and classmates are quick to force her out of her seat with NoSympathy and are quick to believe that she's picking on Lila when she tries to debunk her lies, leaving Mari to nearly get akumatized twice]]. The episode has lead to a large number of fics that involve Marinette getting ostracized from her class and/or getting akumatized, while the class is no longer trusted by her after they realize [[MyGodWhatHaveIDone what they've done]].
** The American special reveals that there is a Miraculous set based on Native American culture, with Jess gaining the Eagle Miraculous, and WordOfGod revealing the identites of the others. What do the others look like, and who gets them?
* In ''WesternAnimation/ThePenguinsOfMadagascar,'' Rico is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.
* The never-seen biological parents of the title characters on ''WesternAnimation/PhineasAndFerb''. Phineas's mother and Ferb's father are married, [[HappilyAdopted they consider them their parents]], and no mention is ever made of what happened to their biological [[DisappearedDad father]] and [[MissingMom mother]], respectively. This has led to a ''lot'' of fan speculation on the subject.
* ''WesternAnimation/{{Pibby}}'': The very premise of the potential series is that a mysterious glitch starts consuming the worlds of Creator/CartoonNetwork and Creator/HannaBarbera and turning their inhabitants into its blank-eyed rainbow-spewing minions. This makes it easy for fans to come up with their own stories depicting Pibby traveling to places like Creator/{{Nickelodeon}}, the Creator/DisneyChannel, Creator/{{Netflix}}, etc. and have her team up with surviving inhabitants of the worlds depicted in those channels.
* ''WesternAnimation/PJMasks'': Due to the show lacking a proper OriginsEpisode for the heroes and villains, the question of how the PJ Masks became superheroes and how they first met the Night Time Villains has generated multiple fanfics already.
* ''WesternAnimation/{{ReBoot}}'' ended with a satisfactory GrandFinale in the third season, although the seeds of [[GreaterScopeVillain a greater evil in play]] were revealed earlier, the Supervirus Daemon having infected the Guardian Collective (who are normally immune to virus infection). The original air date for the Season 3 finale was 1998, and [[VindicatedByHistory good reruns]] on Creator/CartoonNetwork brought about [[UnCancelled a fourth season]] in 2001 to pick up on the Daemon arc. In the interim, fanfic writers had a field day telling a ''Franchise/StarWars''-esque battle to save the net. When the fourth season finally aired, the story was notably [[HypeBacklash not the epic, sprawling battle expected]] but isolated encounters that took up a whole four episodes to tell. And the less said about ''[[Series/ReBootTheGuardianCode The Guardian Code]]'', the better.
* ''WesternAnimation/RegularShow'' has two: What happened on Earth during the three years the park was in space? And what happened during [[spoiler:the twenty-five years between the park's return and the reunion]]?
* ''WesternAnimation/RoadRovers'' has loads of things for fans to expand on, including the relationship between Parvo and the Groomer, [[SailorEarth adding new Road Rovers or creating their own groups]], and elaborating on the backstories of the Road Rovers.
* ''WesternAnimation/RocketPower'': In the episode "Welcome to [=OttoWorld=]", the Rocket gang burries a time capsule and wonders if anyone will remember them in the future. The episode ends with a scene in which the time capsule is opened again in the distant future, and we get to see four statues of the protagonists. What did they do to apparently get this famous?
* As of Season 5, ''WesternAnimation/SamuraiJack'' has been stuck in the future for 50 years. What adventures did he have during those five decades?
* ''Franchise/ScoobyDoo'':
** The franchise in general, with its simple-but-charming formula, is perfect for any fanfic writer to jump in and play with. Much like ''Series/DoctorWho'', it's ultimately just about a group of close-knit friends and [[WalkingTheEarth their never-ending travels]] in a SignatureTeamTransport, where practically ''anything'' can happen.
** ''WesternAnimation/ScoobyDooMysteryIncorporated'':
*** The original Mystery Incorporated team from the 1960s likely spent ''at least'' as much time solving mysteries as the classic crew, but their adventures are only hinted at in vague flashbacks. Exploring their adventures opens up a great opportunity for putting a darker spin on the classic ''Scooby-Doo'' formula.
*** The show's many cryptic references to past historical mystery-solving organizations who were compelled to hunt down evildoers under the Evil Entity's influence. There were the Hunters of Secrets (a quartet of Mayan warriors with a pet jaguar), the Fraternitas Mysterium (a quartet of Spanish monks with a pet donkey), the Alianza Misterio (a quartet of masked Mexican outlaws with a pet skunk), the Mystery Gang (an all-female quartet of cowgirls with a pet bull), the Benevolent Lodge of Mystery (a secret society of Victorian inventors with a pet orangutan), and the Mystery Fellowship (an eccentric high-society family of detectives living in a dark mansion that ''sank into the Earth'').
* ''WesternAnimation/TheSecretShow'':
** It's revealed in "[[Recap/TheSecretShowS2E12ItsAHamsterWorld It's a Hamster World]]" that Changed Daily and Lucy Woo were the Victor and Anita of their day back when they were agents. Only their final mission together is depicted, though, which begs the question: what must their other missions have been like? Moreover, what kind of rogues gallery did they have besides Hamster Man?
** [[Recap/TheSecretShowS2E5VictorOfTheFuture "Victor of the Future"]] depicts the future versions of Victor (who is now "Changed Pandimensionally" and goes by Jet Strong) and Professor Professor (who is an even bigger {{Jerkass}} than in the present), but not the future versions of Anita, Changed Daily, or anyone else. What are they like?
** [[WhatCouldHaveBeen There were plans for U.Z.Z. to fight another group of aliens called the Puddleheads]], but they were left on the cutting room floor. The Puddleheads were conceived as sworn enemies of the Floaty-heads. What would the Puddleheads look like, and how would they act?
** Surely, U.Z.Z. has more locations around the world than just the U.K. one. Assuming there are indeed more branches of U.Z.Z., what are they like and are their adventures just as crazy as the ones with the U.K. branch?
** What were Victor and Anita's lives like before they met and were recruited by U.Z.Z.?
* As with the various comic books, there is a lot of fandom around ''WesternAnimation/SonicTheHedgehogSatAM'', including possible continuations of the prematurely aborted plot. At least one set of storytellers has gotten their hands on development material from the canceled third season of the series.
* ''WesternAnimation/StarVsTheForcesOfEvil'':
** [[Recap/StarVsTheForcesOfEvilS2E31RunningWithScissors "Running with Scissors"]] is a major source of this. Marco spent sixteen years in a YearInsideHourOutside dimension in this episode, so fans naturally explore the possibilities of all the adventures he must have had during that time. It's also popular to build off of the bittersweet mood of the ending, which implied that Marco would have a hard time readjusting to life on Earth, which [[TheyWastedAPerfectlyGoodPlot ended up not being the case]].
** Another major source is [[Recap/StarVsTheForcesOfEvilS2E32Mathmagic "Mathmagic"]], due to making {{Alternate Universe}}s canonical in the lore and world of ''Star vs.'' and, more importantly, making it canonical that the characters are ''aware'' that there are alternate universes, both of which provided copious amounts of AlternateUniverseFic fuel, especially ones that expanded upon the [=AUs=] already presented in the episode.
* ''WesternAnimation/StevenUniverse'':
** In the episode "Lars of the Stars", Lars and the Off-Colors have gone from forgotten dregs of society hiding from Robonoids in ancient, abandoned areas of Homeworld, to a BadassCrew who hijacked a ship, became SpacePirates and gained an arch-nemesis. What happened in between hiding and escaping from Homeworld, and HOW did they manage those things?
** The episode "A Single Pale Rose" reveals that Pearl has the phone numbers of (at least) nine people. She was shown receiving Mystery Girl's phone number at the end of "Last One Out of Beach City", but it's unclear who the other numbers belong to. Where and how did Pearl get them?
** Gem society and history can also raise various questions, because although the show has plenty of worldbuilding, quite a few things are left to the imagination due to show never straying from Steven's POV and whatever concerns him.
* ''WesternAnimation/TangledTheSeries'' ends with an epilogue rife with this, ranging from how Lance is going to raise Kiera and Catalina to what adventures [[spoiler:Cassandra]] is going to have outside of Corona. Varian also becomes the Royal Alchemist [[WhatCouldHaveBeen and there was an idea for a spin-off show involving him that got scrapped]]. Naturally, there are [[FandomSpecificPlot plenty of fanfics attempting to recreate it]].
* Four words: "The Tournament of Heroines". Fans of ''WesternAnimation/TeenTitans2003'' can only guess how this event at the end of "[[Recap/TeenTitansS2E9WinnerTakeAll Winner Take All]]" turned out, but writers just ''love'' giving their own $0.02 on it. (And ''all'' of them notice that Terra was in the background; how that's handled depends on the writer's personal views of the character.)
* ''WesternAnimation/TotalDrama'':
** The ShowWithinAShow format has naturally led to a plethora of [[FandomSpecificPlot fan seasons]], often populated entirely by [=OCs=]. Not to mention the possibilities for what happens to the canon characters ''after'' the show (or before or between seasons).
** Mike has [[SplitPersonality a disorder]] that basically guarantees he had [[DarkAndTroubledPast a traumatic past]] before joining the show, but this is never elaborated on. The introduction of [[TokenEvilTeammate his evil alter]], Mal, only adds more fanfic fuel to the fire.
* ''Franchise/{{Transformers}}'':
** Many have wondered what happened during the time skip between the last episode of the second season of ''WesternAnimation/TheTransformers'' and ''WesternAnimation/TransformersTheMovie.''
** Since ''WesternAnimation/TransformersAnimated'' left quite a few questions unanswered, plenty of potential there. Especially with the ''[=AllSpark=] Almanac Volume 2'', which contains unused Season 4 material.
*** The same goes for the ''WesternAnimation/TransformersPrime'' finale movie, ''Predacons Rising'' -- namely: Where did [[spoiler:Megatron]] go; did [[spoiler:Starscream]] survive his encounter with the Predacons; how will Team Prime cope after [[spoiler:Prime's death]]; and what became of [[spoiler:Shockwave]]? While ''WesternAnimation/TransformersRobotsInDisguise2015'' answered the [[spoiler:Starscream]] question, it left the others tantalizingly open.
* ''WesternAnimation/YoungJustice2010'' gets quite a lot of this with its large TimeSkip and original [[ScrewedByTheNetwork cancellation-induced]] cliffhanger ending. What did [[spoiler:the Justice League]] do when they were BrainwashedAndCrazy? What happened to [[spoiler:Kid Flash]]? How does [[spoiler:Darkseid]] figure into all of this? That said, the show was UnCanceled, so it could explore these itself.
** Ivy mentions discovery of a new continent "untouched by frog, newt or toad hands", with at least 3 characters, [[spoiler: Sprig, Ivy and Grime]] eager to explore it. It's a perfect setup for all kinds of crossovers.
** Anne, Sasha's and Marcy's lives after the series' finale, either leading towards the WhereAreTheyNow ending or going forward.
** The fact that Anne[[spoiler:, upon dying at age 91, will become the replacement of the omnipotent GuardianOfTheMultiverse, basically becoming a god]].
* ''WesternAnimation/AdventureTime'':
** The history between Marceline and Simon Petrikov. As the show went on, it's clear that Simon's morals and ethics were a heavy influence on a young Marceline, serving as a ParentalSubstitute. Fans enjoy exploring their bond, coming up with stories that either take place in the immediate aftermath of [[AtomicHate the]] [[WorldWarIII Mushroom]] [[ApocalypseHow War]] (which is this trope in of itself) or take place after Simon is returned to normal in present-day Ooo, to nothing of the various AU fics where he at least makes an appearance as a mentor figure.
** For that matter, the relationship between [[spoiler:Simon and Betty]] seems to get a lot of attention.
* In the ''WesternAnimation/AladdinTheSeries'' episode "Eye of the Beholder", it's revealed that Fasir and Mirage were once in love. What was their past like?
* ''WesternAnimation/AvatarTheLastAirbender'':
** The fate of Ursa. The show left a few other minor plot threads hanging, but that's the one that really got everyone upset, and speculating. It was resolved in ''ComicBook/AvatarTheLastAirbenderTheSearch'', though it [[BrokenBase divided]] fans and critics.
** And, you know, a century-long war, with plenty of rich, undeveloped ground for exciting battles and stuff. And one thousand Avatars in the history of the world, too.
** The SequelSeries, ''WesternAnimation/TheLegendOfKorra'', is filled to the brim with potential fanfic hooks. Not only is the show set eight decades after ''WesternAnimation/{{Avatar|TheLastAirbender}}'', but there are also several smaller {{time skip}}s within the show itself, including a whopping 3-year gap between Books Three and Four. Also, ''Korra'''s comparatively faster pace means that a lot of background details that aren't directly relevant to the plot are left open-ended, including [[WorkingWithTheEx the specifics of past relationships]], the exact details of villains' [[MysteriousPast rises to power]], and [[SequelNonEntity even the fates of some of the main characters of The Last Airbender]]. Considering the creators are [[TeasingCreator well aware]] of how their show's fandom operates, this is almost undoubtedly intentional. In fact, in the Book Four commentary, they told people to write fanfic about Mako's relationship with Zuko's granddaughter because they couldn't fit her into the show.
** Another example for ''Korra'' is alternative starting points for Korra and Asami's relationship. In Book One, Asami's father is an Equalist, an anti-bending revolutionary. A popular fanfic origin is one in which Asami fully serves them rather than turning on her father and siding with Korra. This generally involves Asami attempting to seduce Korra. A similar situation occurs with Korra having been captured by the Red Lotus as a child, at which point she and Asami are on opposite sides for a different reason, until they inevitably find each other.
* Since the ''WesternAnimation/{{Beetlejuice}}'' cartoon has an almost completely different premise than [[Film/{{Beetlejuice}} the movie]] did, one of the most common sources of fanfic fuel involves figuring out how the cartoon versions of Beetlejuice and Lydia met and became friends. (There ''is'' a vague back story given in [[ComicBook/{{Beetlejuice}} the comic book adaptation]], but it's unclear whether this is intended to be canon to the show.) The other question fic writers like to try to answer is, in the absence of a proper series finale, what became of the duo's relationship in the future?
* ''Franchise/Ben10'':
** There's plenty of AllThereInTheManual information on the series' background, including official bios for each alien form used by Ben, providing info about these aliens' species, planets and for some of them cultures, with only a few of them having been actually explored in the various entries. This leaves plenty of material for fans to create their own alien [=OCs=] or develop further the various planets. In addition, Ben is stated to have access to more than one million aliens on the Omnitrix, leaving a huge gap for fans to fill with their own fan-made aliens.
** In ''WesternAnimation/Ben10AlienForce'', the whole Plumber's Kid is based around the idea that a lot of [[HalfHumanHybrid alien-human hybrids]] exist on Earth due to former Plumbers mating with humans. This makes for an excellent justification for fans to create their own half-alien OC.
* ''WesternAnimation/ChipNDaleRescueRangers'' leaves several questions unanswered and thereby FanFic writers with a desire to answer them.
** Monterey Jack is the only Rangers whose parents we get to know. Chip's, Dale's and Zipper's families aren't even hinted at. But in Gadget's case, her father, Geegaw Hackwrench, is mentioned enough to fuel the viewers' curiosity. He is only ever seen in a framed picture in "To the Rescue" Part 3, and Gadget mentions that she has lost him more than one year prior to the events of this episode. What exactly happened to him remains unknown. In a show that has its fair share of mystery and thrillers, this just has to fuel the audience's curiosity.
** Speaking of Geegaw, he and Monty have been in some NoodleIncident in Zanzibar which involved a cheese bread and greatly upset Geegaw. While Monty tells a lot of tales from his past which may or may not be true, this is the one that the Rangerphiles really want to know more about.
** Gadget's mother remains entirely unmentioned. Neither Monty nor Gadget ever talks about her. But if ''CDRR'' fanfic writers have to solve the mystery of Geegaw's demise, it's only natural that they have to write something about her mother as well.
** Then there is "Good Times, Bat Times", the episode in which Dale ends up with Foxglove as his girlfriend. It's often considered the chronologically last episode (there is no defined chronology throughout a show that has the pilot in Season 2). Either way, we don't find out how things go on with Dale in a relationship with a cute pink bat (unless you count [[ComicBook/ChipNDaleRescueRangers the Boom! comics]] as {{Canon}}). Will Foxy join the Rangers? What'll Chip do, now that he doesn't have any competition for Gadget anymore?
** How come there's a mouse in Hawaii that [[{{Doppelganger}} looks pretty much identical to Gadget]]?
* ''WesternAnimation/DannyPhantom'':
** [[FutureMeScaresMe Dark Danny]]'s return, which the show teased at the end of the character's debut episode, but never came into fruition due to the show ended sooner than planned.
** Both creator Butch Hartman, and head writer for the first two seasons Steve Marmel, wanted to do a plot where [[OppositeSexClone Danielle "Dani" Phantom]] would be introduced to Danny's family and adopted, but didn't have time to properly setup such a development. Naturally, fans like exploring this possibility in fan works.
** Fans often wonder what, exactly, happened when Danny first gained his powers, as there's a month between the FreakLabAccident accident and the start of the show; the accident itself is only loosely depicted in the ExpositoryThemeTune and in the episode "Memory Blank" (wherein the characters ''recreate'' it), and we don't see what happened in that first month at ''all''.
** The show in general raises some questions about the nature of ghosts and the Ghost Zone that are never given answers (or [[FanDislikedExplanation ones are just plain unsatisfying]]), leading to fans [[EpilepticTrees come up with their own creative answers for]].
* ''WesternAnimation/{{Daria}}'''s BizarroEpisode, "Depth Takes a Holiday," is often relegated to FanonDiscontinuity, but other times fans wonder: if Lawndale actually has an interdimensional portal, couldn't that set up all sorts of sci-fi/fantasy fics, not to mention crossovers?
* Franchise/DCAnimatedUniverse:
** Many people wondered what happened between the timelines of ''[[WesternAnimation/JusticeLeague Justice League Unlimited]]'' and ''WesternAnimation/BatmanBeyond''. Fifty years had passed and many of the Justice Leaguers are gone. They've also wondered about the circumstances which led to Warhawk, son of Hawkgirl and Green Lantern, being conceived and born.
** Not to mention the "[[NoodleIncident Near-Apocalypse of '09]]".
* ''WesternAnimation/{{Gargoyles}}'' is an absolute treasure trove of this, thanks to [[TooGoodToLast its rather abrupt cancellation]], and [[WhatCouldHaveBeen the creator's extremely detailed notes about the planned future of the mythos]].
** There was going to be a ''Dark Ages'' prequel spinoff focused on the early days of the Wyvern Clan in Medieval Scotland, when Goliath and Demona were still young lovers fighting under Hudson's guidance. Not to mention a planned ''Gargoyles: 2198'' SequelSeries, with the cast's descendants fighting off an alien invasion (first hinted at in "Sentinel") in the far future. Both concepts practically beg for fanfiction.
** The released notes for ''2198'' confirm (among other tidbits) that Elisa and Natsilane's descendants would eventually have gotten together, that Lexington and Xanatos would eventually have merged corporations, and that a line of robots based on Lexington would eventually have entered production. All dynamite ideas for fanfiction.
** After fans pestered him about it in his "Ask Greg" Q&A forum, Creator/GregWeisman confirmed that he did have plans to work characters from [[Creator/WilliamShakespeare Shakespeare]]'s ''Theatre/TheTempest'' into the ''Gargoyles'' mythos. How would they have figured in the story? How would Weisman have portrayed them? How different would they have been from their literary counterparts? Note that the ''Gargoyles'' universe already includes sorcerers, Fae spirits, monstrous humanoids, volatile court politics, and [[DoesThisRemindYouOfAnything an enchanted island fought over by various factions of sorcerers and spirits]]; a retelling of ''The Tempest'' practically writes itself.
** After Demona and Macbeth were made immortal by the same magic spell, they canonically lived through over 900 years of human history--barely any of which has actually been seen in canon. What adventures did they get up to while Goliath and his pals were still sleeping in statue-form?
** [[GreatOffscreenWar The interstellar war between the N'Kai and the Space-Spawn]].
** Alexander Xanatos's time studying magic under Puck's tutelage.
** Alex Xanatos taking up the mantle of Fox from his mother (a possible future plot point that was hinted at in "Future Tense").
** Queen Titania's relationship with Halcyon Renard.
** Peter Maza's relationship with the trickster spirit Coyote (the specific nature of which was left rather vague in-show).
** The careers of Canmore's descendants who took up the mantle of [[LegacyCharacter "The Hunter"]] after him.
** [[WordOfGay Lexington]] acknowledging and coming to terms with his homosexuality.
** The lives and adventures of the gargoyles in the Wyvern Clan [[WeHardlyKnewYe who were all killed off in the pilot episode]] [[DeathByOriginStory shortly after being introduced]], and also those of Angela's rookery brothers and sisters back on Avalon.
** The history and true purpose of the Illuminati.
** The Redemption Squad's battle with the Illuminati after the cancellation of the ''Gargoyles: Bad Guys'' spinoff.
** [[TheLancer Brookyln]]'s adventures traveling through time with the Phoenix Gate (which were going to be the basis of the proposed ''Gargoyles: Timedancer'' spinoff). All we really know from the comics is that his adventures involved [[EyepatchOfPower losing an eye]], traveling to China and Japan, meeting his loyal pet companion Fu-Dog and his true love Katana, and eventually having a son named Nashville (with a second unhatched child nicknamed "Eggwardo" on the way). Whatever he got up to while time-traveling, he apparently had to seriously sharpen his combat skills in order to survive; when he's seen again, he's sporting an armored breastplate and packing a gun, a katana, and a pair of daggers.
* ''WesternAnimation/GravityFalls'':
** Two major examples of this: How the events in the show affected Dipper and Mabel's lives at home after summer vacation ended, and the adventures that [[spoiler:the Stan twins]] got up to after the show's end.
** Stan's ten years on the road after [[spoiler:getting disowned and separated from Ford]] have increasingly become popular, especially for DarkFic and AlternateUniverseFic.
* ''WesternAnimation/HeyArnold'':
** The series was supposed to end with ''The Jungle Movie'', which would have seen Arnold and Helga admit their true feelings for each other, and would have seen Arnold finding his parents, but the show was cancelled and the movie was put on the back-burner. However, creator Creator/CraigBartlett has revealed bits and pieces of the finale's intended plot, and the fanfic community has responded in kind. With Creator/{{Nickelodeon}} producing it as [[WesternAnimation/HeyArnoldTheJungleMovie a TV movie over a decade later]], the fans can now see how similar their takes on the story were to the final film.
** Ditto for Bartlett's unproduced spinoff ''The Patakis'', about the home life of a teenaged Helga. The pilot script was apparently too dark for Creator/{{Nickelodeon}}, but Bartlett has revealed enough details for the fanfic writers to use. Unlike ''The Jungle Movie'', Nickelodeon has not given this the green light yet.
* ''WesternAnimation/InfinityTrain'':
** The train itself. Since it already has the mysterious ability to travel through dimensions, fans like to imagine that humans from the show's Earth aren't the only passengers on the train, and that it can be host to beings (both human and non-human) from various different timelines and dimensions. Cue half of the fics for the fandom consisting of {{crossover}}s with other works.
** The other half are mostly {{Continuation}}s: what is [X]'s life like now that they're off the train? Creator Owen Dennis has stated he had no interest in deeply exploring the lives of characters after they've gotten their exit, which only gives more reason for fanfic authors to do the job themselves and imagine how each season's protagonists are doing now that they're back on Earth and have to deal with not having reflections, being made of metal, or just their lingering emotions about spending weeks/months/years of their lives on the locomotive.
* ''WesternAnimation/InvaderZim'':
** The show contains a surprising amount of background detail upon which numerous fans can and have elaborated, ranging from an interstellar war to Irken reproduction. Especially since the show was canceled just as it was developing a MythArc, and the creators have revealed their basic plans to fans.
** The "Battle Void" StoryArc from the [[ComicBook/InvaderZimOni comic book continuation]] features a series of Zims from {{Alternate Universe}}s, most of them very bizarrely different from Zim himself. This has proven very inspirational ground for fanfic writers, as has the StartOfDarkness for the arc's main antagonist, [[spoiler:Zib, an alternate Dib who defeated his Zim then [[FusionDance merged]] with his PAK]].
* ''WesternAnimation/{{Jellystone}}'': An unorthodox example; fans of the show are fond of redesigning characters from other media, particularly Funny Animal ones, in C.H. Greenblatt's style and calling them the Jellystone versions of them.
* ''WesternAnimation/JimmyTwoShoes'':
** Who is Beezy's mother/Lucius' wife, and what happened to her? There ''was'' a Mrs. Heinous in the early stages of the series' development, but in the final product, she's Lucius' RichBitch girlfriend Jez.
** How did Jimmy and Heloise end up in Miseryville? This was actually addressed in [[WhatCouldHaveBeen the original pitch]] (which was that Jimmy and Heloise died and went to Hell -- by accident in the former's case), but since the final product makes its canonicity dubious, fans have often created their own theories in place, often with elements from the original concept.
* ''WesternAnimation/KimPossible'' has some common jumping-off points:
** Graduation from high school was [[GraduateFromTheStory the ending for the series]] but presumably a new beginning for Kim and Ron. Quite a few fics follow their adventures to college and beyond to adult life.
** A new beginning is also suggested for Dr. Drakken and Shego, who end up [[EnemyMine helping save the world]] instead of menacing it and apparently [[LastMinuteHookup become a couple]].
** The planet Lorwardia was introduced with just enough information to suggest that it's the [[PlanetOfHats homeworld of a]] ProudWarriorRace.
* ''WesternAnimation/TheLoudHouse'' episode "The Loudest Mission" gives us two -- 1) Who's going to buy the Santiago residence? 2) What adventures will Ronnie and Bobby have with their relatives? The latter question was eventually answered by the spinoff series ''WesternAnimation/TheCasagrandes''.
* ''WesternAnimation/TheMagicSchoolBus'' has a pretty devoted fanfic community, largely because of all the tantalizing questions about the characters that it leaves unanswered. Where exactly did [[InexplicablyAwesome Miss Frizzle]] come from, and how did she get her famous bus? What sort of relationship did she have with [[WesternAnimation/TheMagicSchoolBusRidesAgain her sister Fiona]] before she replaced her as teacher? Are there any other teachers at the kids' school, and are they all as... "interesting" as Miss Frizzle? How did the kids handle adolescence and adulthood? And what were things ''really'' like [[CatchPhrase at Phoebe's old school]]?
* ''WesternAnimation/MiraculousLadybug'':
** Are Marinette and Adrien protected (by their miraculouses) against Hawk Moth's powers? If not, their akumatized selves are often represented, and nicknamed White Cat and Miss Fortune, respectively. However, the episode "Zombizou" seems to confirm that they aren't protected against akumatization. Furthermore, the akumatized Chat Noir is canonically named Chat Blanc, which is French for "White Cat".
** Many fanfics have them revealing their secret identities to each other, which has yet to happen in canon, though they have come close a few times.
** [[spoiler:What is the Peacock Miraculous doing in Gabriel Agreste's safe? Fans speculate that either he or his wife used to be the holder, and their costumes are often represented.]]
** In "Chameleon", [[spoiler:Marinette's friends and classmates are quick to force her out of her seat with NoSympathy and are quick to believe that she's picking on Lila when she tries to debunk her lies, leaving Mari to nearly get akumatized twice]]. The episode has lead to a large number of fics that involve Marinette getting ostracized from her class and/or getting akumatized, while the class is no longer trusted by her after they realize [[MyGodWhatHaveIDone what they've done]].
** The American special reveals that there is a Miraculous set based on Native American culture, with Jess gaining the Eagle Miraculous, and WordOfGod revealing the identites of the others. What do the others look like, and who gets them?
* In ''WesternAnimation/ThePenguinsOfMadagascar,'' Rico is animated with a large scar that crosses his beak. It has never been explained in canon, nor do the other characters draw any attention to it, as if they don't even notice it any more. For Rico's past specifically it is a common question of exactly what happened to give him the scar, and how to make it fit in with canon.
* The never-seen biological parents of the title characters on ''WesternAnimation/PhineasAndFerb''. Phineas's mother and Ferb's father are married, [[HappilyAdopted they consider them their parents]], and no mention is ever made of what happened to their biological [[DisappearedDad father]] and [[MissingMom mother]], respectively. This has led to a ''lot'' of fan speculation on the subject.
* ''WesternAnimation/{{Pibby}}'': The very premise of the potential series is that a mysterious glitch starts consuming the worlds of Creator/CartoonNetwork and Creator/HannaBarbera and turning their inhabitants into its blank-eyed rainbow-spewing minions. This makes it easy for fans to come up with their own stories depicting Pibby traveling to places like Creator/{{Nickelodeon}}, the Creator/DisneyChannel, Creator/{{Netflix}}, etc. and have her team up with surviving inhabitants of the worlds depicted in those channels.
* ''WesternAnimation/PJMasks'': Due to the show lacking a proper OriginsEpisode for the heroes and villains, the question of how the PJ Masks became superheroes and how they first met the Night Time Villains has generated multiple fanfics already.
* ''WesternAnimation/{{ReBoot}}'' ended with a satisfactory GrandFinale in the third season, although the seeds of [[GreaterScopeVillain a greater evil in play]] were revealed earlier, the Supervirus Daemon having infected the Guardian Collective (who are normally immune to virus infection). The original air date for the Season 3 finale was 1998, and [[VindicatedByHistory good reruns]] on Creator/CartoonNetwork brought about [[UnCancelled a fourth season]] in 2001 to pick up on the Daemon arc. In the interim, fanfic writers had a field day telling a ''Franchise/StarWars''-esque battle to save the net. When the fourth season finally aired, the story was notably [[HypeBacklash not the epic, sprawling battle expected]] but isolated encounters that took up a whole four episodes to tell. And the less said about ''[[Series/ReBootTheGuardianCode The Guardian Code]]'', the better.
* ''WesternAnimation/RegularShow'' has two: What happened on Earth during the three years the park was in space? And what happened during [[spoiler:the twenty-five years between the park's return and the reunion]]?
* ''WesternAnimation/RoadRovers'' has loads of things for fans to expand on, including the relationship between Parvo and the Groomer, [[SailorEarth adding new Road Rovers or creating their own groups]], and elaborating on the backstories of the Road Rovers.
* ''WesternAnimation/RocketPower'': In the episode "Welcome to [=OttoWorld=]", the Rocket gang burries a time capsule and wonders if anyone will remember them in the future. The episode ends with a scene in which the time capsule is opened again in the distant future, and we get to see four statues of the protagonists. What did they do to apparently get this famous?
* As of Season 5, ''WesternAnimation/SamuraiJack'' has been stuck in the future for 50 years. What adventures did he have during those five decades?
* ''Franchise/ScoobyDoo'':
** The franchise in general, with its simple-but-charming formula, is perfect for any fanfic writer to jump in and play with. Much like ''Series/DoctorWho'', it's ultimately just about a group of close-knit friends and [[WalkingTheEarth their never-ending travels]] in a SignatureTeamTransport, where practically ''anything'' can happen.
** ''WesternAnimation/ScoobyDooMysteryIncorporated'':
*** The original Mystery Incorporated team from the 1960s likely spent ''at least'' as much time solving mysteries as the classic crew, but their adventures are only hinted at in vague flashbacks. Exploring their adventures opens up a great opportunity for putting a darker spin on the classic ''Scooby-Doo'' formula.
*** The show's many cryptic references to past historical mystery-solving organizations who were compelled to hunt down evildoers under the Evil Entity's influence. There were the Hunters of Secrets (a quartet of Mayan warriors with a pet jaguar), the Fraternitas Mysterium (a quartet of Spanish monks with a pet donkey), the Alianza Misterio (a quartet of masked Mexican outlaws with a pet skunk), the Mystery Gang (an all-female quartet of cowgirls with a pet bull), the Benevolent Lodge of Mystery (a secret society of Victorian inventors with a pet orangutan), and the Mystery Fellowship (an eccentric high-society family of detectives living in a dark mansion that ''sank into the Earth'').
* ''WesternAnimation/TheSecretShow'':
** It's revealed in "[[Recap/TheSecretShowS2E12ItsAHamsterWorld It's a Hamster World]]" that Changed Daily and Lucy Woo were the Victor and Anita of their day back when they were agents. Only their final mission together is depicted, though, which begs the question: what must their other missions have been like? Moreover, what kind of rogues gallery did they have besides Hamster Man?
** [[Recap/TheSecretShowS2E5VictorOfTheFuture "Victor of the Future"]] depicts the future versions of Victor (who is now "Changed Pandimensionally" and goes by Jet Strong) and Professor Professor (who is an even bigger {{Jerkass}} than in the present), but not the future versions of Anita, Changed Daily, or anyone else. What are they like?
** [[WhatCouldHaveBeen There were plans for U.Z.Z. to fight another group of aliens called the Puddleheads]], but they were left on the cutting room floor. The Puddleheads were conceived as sworn enemies of the Floaty-heads. What would the Puddleheads look like, and how would they act?
** Surely, U.Z.Z. has more locations around the world than just the U.K. one. Assuming there are indeed more branches of U.Z.Z., what are they like and are their adventures just as crazy as the ones with the U.K. branch?
** What were Victor and Anita's lives like before they met and were recruited by U.Z.Z.?
* As with the various comic books, there is a lot of fandom around ''WesternAnimation/SonicTheHedgehogSatAM'', including possible continuations of the prematurely aborted plot. At least one set of storytellers has gotten their hands on development material from the canceled third season of the series.
* ''WesternAnimation/StarVsTheForcesOfEvil'':
** [[Recap/StarVsTheForcesOfEvilS2E31RunningWithScissors "Running with Scissors"]] is a major source of this. Marco spent sixteen years in a YearInsideHourOutside dimension in this episode, so fans naturally explore the possibilities of all the adventures he must have had during that time. It's also popular to build off of the bittersweet mood of the ending, which implied that Marco would have a hard time readjusting to life on Earth, which [[TheyWastedAPerfectlyGoodPlot ended up not being the case]].
** Another major source is [[Recap/StarVsTheForcesOfEvilS2E32Mathmagic "Mathmagic"]], due to making {{Alternate Universe}}s canonical in the lore and world of ''Star vs.'' and, more importantly, making it canonical that the characters are ''aware'' that there are alternate universes, both of which provided copious amounts of AlternateUniverseFic fuel, especially ones that expanded upon the [=AUs=] already presented in the episode.
* ''WesternAnimation/StevenUniverse'':
** In the episode "Lars of the Stars", Lars and the Off-Colors have gone from forgotten dregs of society hiding from Robonoids in ancient, abandoned areas of Homeworld, to a BadassCrew who hijacked a ship, became SpacePirates and gained an arch-nemesis. What happened in between hiding and escaping from Homeworld, and HOW did they manage those things?
** The episode "A Single Pale Rose" reveals that Pearl has the phone numbers of (at least) nine people. She was shown receiving Mystery Girl's phone number at the end of "Last One Out of Beach City", but it's unclear who the other numbers belong to. Where and how did Pearl get them?
** Gem society and history can also raise various questions, because although the show has plenty of worldbuilding, quite a few things are left to the imagination due to show never straying from Steven's POV and whatever concerns him.
* ''WesternAnimation/TangledTheSeries'' ends with an epilogue rife with this, ranging from how Lance is going to raise Kiera and Catalina to what adventures [[spoiler:Cassandra]] is going to have outside of Corona. Varian also becomes the Royal Alchemist [[WhatCouldHaveBeen and there was an idea for a spin-off show involving him that got scrapped]]. Naturally, there are [[FandomSpecificPlot plenty of fanfics attempting to recreate it]].
* Four words: "The Tournament of Heroines". Fans of ''WesternAnimation/TeenTitans2003'' can only guess how this event at the end of "[[Recap/TeenTitansS2E9WinnerTakeAll Winner Take All]]" turned out, but writers just ''love'' giving their own $0.02 on it. (And ''all'' of them notice that Terra was in the background; how that's handled depends on the writer's personal views of the character.)
* ''WesternAnimation/TotalDrama'':
** The ShowWithinAShow format has naturally led to a plethora of [[FandomSpecificPlot fan seasons]], often populated entirely by [=OCs=]. Not to mention the possibilities for what happens to the canon characters ''after'' the show (or before or between seasons).
** Mike has [[SplitPersonality a disorder]] that basically guarantees he had [[DarkAndTroubledPast a traumatic past]] before joining the show, but this is never elaborated on. The introduction of [[TokenEvilTeammate his evil alter]], Mal, only adds more fanfic fuel to the fire.
* ''Franchise/{{Transformers}}'':
** Many have wondered what happened during the time skip between the last episode of the second season of ''WesternAnimation/TheTransformers'' and ''WesternAnimation/TransformersTheMovie.''
** Since ''WesternAnimation/TransformersAnimated'' left quite a few questions unanswered, plenty of potential there. Especially with the ''[=AllSpark=] Almanac Volume 2'', which contains unused Season 4 material.
*** The same goes for the ''WesternAnimation/TransformersPrime'' finale movie, ''Predacons Rising'' -- namely: Where did [[spoiler:Megatron]] go; did [[spoiler:Starscream]] survive his encounter with the Predacons; how will Team Prime cope after [[spoiler:Prime's death]]; and what became of [[spoiler:Shockwave]]? While ''WesternAnimation/TransformersRobotsInDisguise2015'' answered the [[spoiler:Starscream]] question, it left the others tantalizingly open.
* ''WesternAnimation/YoungJustice2010'' gets quite a lot of this with its large TimeSkip and original [[ScrewedByTheNetwork cancellation-induced]] cliffhanger ending. What did [[spoiler:the Justice League]] do when they were BrainwashedAndCrazy? What happened to [[spoiler:Kid Flash]]? How does [[spoiler:Darkseid]] figure into all of this? That said, the show was UnCanceled, so it could explore these itself.
