The opposite of FandomRivalry. Two (or more) fandoms have a lot of overlap because of shared talent (sometimes the result of a ProductionPosse), because of similar subject matter, because they happened to air at about the same time, or for no real reason at all - they just like each other. Often people get into one fandom and are encouraged by this relationship to get into the other.


* In spite of the oft-hyped [[FandomRivalry tensions]] between fans of ''Franchise/StarWars'' and those of ''Franchise/StarTrek'', truth is, outside of exceptions, the two sagas are so different, they don't really step on each other's toes. And in the modern times, true pop-culture geeks understand the economics of how TV and film projects get the go-ahead or not, therefore, fans of both works tend to look at the others' success as being a boost to their own favorite.
** GeneRoddenberry and GeorgeLucas are documented as expressing admiration for the other's franchise. Lucas stated ''Trek'' influenced ''Wars'', and Roddenberry acknowledged it was the massive success of ''Wars'' that led to the greenlight for ''Film/StarTrekTheMotionPicture''. Lucas' Creator/IndustrialLightAndMagic also provided the effects for many ''Star Trek'' movies.
** Plus, the fact that a couple Star Trek alumni have voiced characters in ''WesternAnimation/StarWarsTheCloneWars'' is further evidence that the days of the intense rivalry between franchises is pretty much past.
** Further, [[Film/StarTrek Reboot!Star Trek]] director Creator/JJAbrams has now been selected to direct the new ''Franchise/StarWars'' movies. (No word on a cameo from ChrisPine as a Jedi.....)
* ''Series/DueSouth'' and ''HardCoreLogo''. [[CanadaEh Because Canadians have to stick together, eh?]]
* There's a great deal of overlap, probably unsurprisingly, between fans of ''Literature/HoratioHornblower'', ''Literature/AubreyMaturin'', ''Film/PiratesOfTheCaribbean'', ''Literature/{{Temeraire}}'' and ''Creator/JaneAusten''. It's more generally known as the Age Of Sail fandom.
* ''Series/DoctorWho'' and ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' have developed some harmony between each other, mostly due to a fan-favorite minor character in the latter show reminding everybody of the Tenth Doctor.
** The Bronies have developed friendships with a lot of fandoms in general, but it seems that the biggest one is the friendship between the Creator/{{Valve|Software}} fandom. Mostly because the Valve games helped to spread the word on it's early days, specially ''VideoGame/TeamFortress2''. Many ''VideoGame/TeamFortress2'' crossovers have been made, to the point of having designed characters from the show to represent the characters from the game in the crossovers, and many references to the game in the pony-related videos in [=YouTube=]. Also helped by the steadily growing number pony models for GarrysMod, which is used to create most [=TF2=] fanvids.
*** Similar to the ''[[Franchise/SonicTheHedgehog Sonic]]''/''[[WesternAnimation/MyLittlePonyFriendshipIsMagic MLP]]'' example below, [=TF2=] and MLP fans get along for ''the most part'', but there are the [[VocalMinority Vocal Minorities]] who love [=TF2=] and despise MLP, and those who worship MLP and detest [=TF2=].
** One notable fandom overlap with MLP is ''VideoGame/DwarfFortress''. It seems odd, but just about a third of [[VideoGameCrueltyPotential the]] [[AffablyEvil DF]] [[CrazyAwesome community]] is a brony.
*** It helps that, when a pony conversion mod was made, the ponies proved themselves to be [[BadassAdorable quite capable of dealing with the usual dwarven troubles]], [[KillerRabbit surpassing the dorfs themselves at times]].
** Bronies and ''SonicTheHedgehog'' fans get along quite well. Fan art often emphasizes the similarities between characters of the two series (i.e., Sonic and Rainbow Dash, Knuckles and Applejack, and so on).
*** Most fans at least. The [[VocalMinority Vocal Minorities]] of both fandoms seem to unreasonably [[FandomRivalry hate each other]] for no reason, leading to EquestriaDaily banning ''Sonic''-related content.
** ''{{Homestuck}}'' sees a good deal of camaraderie with Bronies, partially due to both franchises tending to dominate attention across the internet and being resultant {{Base Breaker}}s. Naturally, this also causes some strife. The fact that fan favorite badass Dirk Strider is a Brony serves to smooth out the edges.
** Given the nature of the fandom, the bronies tend to cross ponies with ''everything'' at some point, even leading to getting a rule of their own added to the RulesOfTheInternet (Rule 85) and that rule being accepted in the standard list now. That being said, you would be hard-pressed to find any fandom the bronies as a whole truly do not like. As for vice versa, your mileage may vary.
* The ''Series/MysteryScienceTheater3000'' fandom has a large crossover percentage with ''{{Transformers}}'' fans. This gives the ''{{Franchise/Transformers}}'' fandom a healthy dose of self-awareness about itself bordering on SelfDeprecation. It's no accident that the ironic use of RuinedForever originated with ''Transformers'' fans; in return, DullSurprise became a meme regarding the poor artwork of Pat Lee. The ''MST3K'' influence is very heavily felt on the TFWiki.
* You can expect many ''VideoGame/{{Touhou}}'' fans to be ''Anime/PuellaMagiMadokaMagica'' fans and vice versa. ''Especially'' if they cosplay.
** The Touhou fandom is also very friendly with the ''{{Vocaloid}}'' fandom, since both are series popularized by fan-submitted content.
* There is a lot of overlap between fans of the video game ''VideoGame/{{Titanfall}}'' and the anime and manga series ''Manga/AttackOnTitan'', both of which center on conflicts between [[MiniMecha massive]] [[HumanoidAbomination "Titans"]] and infantry with [[GrapplingHookGun equipment to]] [[JetPack enhance mobility]].
* [[FandomRivalry Rival fandoms]] who team up with each other to [[EnemyMine fight a bigger Rival Fandom]] can develop into this over time. The rivalry between ''[[Franchise/SuperMarioBros Mario]]'' and ''Franchise/{{Sonic|TheHedgehog}}'' has developed into this, for example.
** Sega has also stated that once they couldn't afford to make consoles anymore they preferred making games for the GameCube because of the similarities between the Nintendo and Sega fandoms. It's no wonder that those fanbases love to team up against the Sony and Microsoft fandoms.
* Many AlternateHistoryDotCom users are fans of ''Anime/CodeGeass'', due to the series being set in an alternate history. A good deal of timelines on the site are also ''Code Geass'' fanfics.
* With the advent of the new ''Series/DoctorWho'', there seems to be a deliberate effort underway to unite ''Who'' fans and ''Franchise/StarTrek'' fans. Besides little things like Creator/PatrickStewart being a big ''Who'' fan and Creator/FreemaAgyeman and Creator/JohnBarrowman being [[Series/StarTrekDeepSpaceNine Niners]], there's also Stewart and Creator/DavidTennant appearing in an [=OldVic=] production of ''Theatre/{{Hamlet}}''. And now, there's [[ComicBook/StarTrekTheNextGenerationDoctorWhoAssimilation2 an official crossover comic from IDW publishing]] pitting the ''Enterprise-D'' and the 11th Doctor against a super-villain alliance between the Borg and Cybermen.
* ''Series/{{Sherlock}}'' and ''Radio/CabinPressure'', due to the shared presence of Creator/BenedictCumberbatch.
* WesternAnimation fans and {{Anime}} fans are beginning to get along pretty well. Several Western Animation characters are even drawn in Anime style on Website/DeviantArt, most notably the ''WesternAnimation/SouthPark'' characters (the latter probably helped by the fact that Trey Parker, one of the creators of the aforementioned show, is a fan of anime).
* There are several ''WebAnimation/HomestarRunner''[=/=]''Webcomic/PennyArcade'' crossover artworks and fanfictions on Website/DeviantArt, especially thanks to ''VideoGame/PokerNightAtTheInventory''.
* ''Webcomic/{{Homestuck}}'' and ''Webcomic/AxisPowersHetalia'' used to have [[FandomRivalry quite the rivalry,]] but after realizing that the two fandoms overlap ''a lot'', they've made up and declared themselves each others Moirails. Hetalia has also struck a cord with some Website/AlternateHistoryDotCom users as well, with all the frequent AlternateUniverseFic opportunities.
* Fans of ''WesternAnimation/BatmanTheAnimatedSeries'' tend to easily become fans of the ''VideoGame/BatmanArkhamSeries'', since Creator/PaulDini, head writer of ''BTAS'', wrote for the ''Arkham'' series, and many [=VAs=] from the Franchise/{{DCAU}} returned to voice their respective characters, notably Creator/KevinConroy as Franchise/{{Batman}} and Creator/MarkHamill as SelfDemonstrating/TheJoker. Quite notable in that most fandoms of each ''Franchise/{{Batman}}'' adaptation tend to be [[FandomRivalry venomous towards each other]].
* If you're a fan of ''VideoGame/TheElderScrollsVSkyrim'', chances are you're also a fan of ''Literature/ASongOfIceAndFire'', particularly [=HBO's=] ''Series/GameOfThrones'' series. A sizable portion of ''Skyrim'''s library of {{Game Mod}}s is devoted to adding ''Game of Thrones''-related content to the game -- there is ''more than one'' mod that adds a fully-modeled Longclaw, for example.
* There's also some overlap between ''Game of Thrones'' fans and players of ''VideoGame/CrusaderKings II'', since the latter is essentially a medieval politics simulator. There's a ''Game of Thrones''-themed GameMod which is reasonably popular, which has in turn inspired a number of AfterActionReport fan fictions. Now that there is also a mod for ''Crusader Kings II'' that allows you to play as one of the rulers in Tamriel, it seems the cycle is now complete.
* With the release of ''Film/TheAvengers'', the Website/{{Tumblr}}-born [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]] to [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]][[Series/{{Sherlock}} Lock]] pattern mentioned in the TV section continued, and now we have [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]][[Film/TheAvengers Avenge]][[Series/{{Sherlock}} Lock]]. Any and all smaller combos of the four show up too.
* Since, in Japan, ''Anime/PrettyCure'' airs in the same kids block as ''Franchise/SuperSentai'' and ''Franchise/KamenRider'', they're going to be grouped together in a lot of fans' minds anyway, but it has a special relationship in 2012 due to the Japanese fandom almost unanimously deciding that [[Anime/SmilePrecure Yayoi]] is a {{Toku}} fan, and, like most fan things, exaggerating it. To wonderful effect.
** In an [[ interview]] published during the lead-in to the movie ''Film/KamenRiderXSuperSentaiSuperHeroTaisen'', ''Series/KamenRiderDecade'' star Masahiro Inoue joking suggested that their next crossover would be with ''Anime/PrettyCure''.[[note]]He ended up being wrong on two counts: The film's sequel ''Film/KamenRiderXSuperSentaiXSpaceSheriffSuperHeroTaisenZ'' was a crossover with ''Film/SpaceSheriffGavanTheMovie'' in which Decade was reduced to a FakeShemp, while Decade's next real appearance was a BatFamilyCrossover in the [[PostScriptSeason post-script epilogue]] of ''Series/KamenRiderWizard''.[[/note]]
* Many ''Webcomic/AxisPowersHetalia'' fans also like the lesser-known ''Webcomic/ScandinaviaAndTheWorld'', due to the similar premises of the series.
* There is quite a bit of overlap between the fandoms of ''Literature/{{Discworld}}'' and ''LightNovel/{{Slayers}}''.
* It seems there are a fair few ''Franchise/MyLittlePony'' fans (as in, fans of the franchise in general, not ''Friendship is Magic'' in particular) who are also ''Franchise/{{Pokemon}}'' fans, perhaps due to both of them being child-oriented and collecting-oriented.
* Hell, a fair chunk of tumblr is dedicated to giant love piles of fandom friendship. [[WebOriginal/{{Fandomstuck}} Excellently exemplified by]] [[ this post.]]
* Fans of ComicBooks, collectible card games like ''TabletopGame/MagicTheGathering'', tabletop wargames like ''TabletopGame/{{Warhammer 40000}}'', and roleplaying games like ''TabletopGame/DungeonsAndDragons'' see considerable overlap, since all are often found under the same roof.
* Many fans of ''Film/LesMiserables2012'', followed Aaron Tveit and George Blagden, the actors who portrayed fan favorite characters Enjolras and Grantaire, to their next projects, ''Series/{{Graceland}}'' and ''Series/{{Vikings}}''. This led to a lot of mingling and friendship between the three fandoms.
* ''Film/PacificRim'':
** With the ''Series/ItsAlwaysSunnyInPhiladelphia'' fandom, mostly because of mutual Charlie Day presences.
** The ''Manga/AttackOnTitan'' fandom is also friendly with this fandom, mostly for the whole "Jaeger" connection.
* ''WesternAnimation/GravityFalls'', ''WesternAnimation/ParaNorman'', and ''{{VideoGame/Psychonauts}}'' have been developing into this.
* The NipponIchi and ''WhenTheyCry'' fanbase, namely due to the former being big players in movements to localize the later.
* Fans of post cancellation ''WesternAnimation/FamilyGuy'' and ''Series/TheBigBangTheory'' are often friendly with each other because both shows rely on pop culture references for jokes and have very similar humor. Of course, this would would also lead to include [[{{Hatedom}} Friendly Hatedoms]] of both.
* The ''VideoGame/WorldOfTanks'' and ''Anime/GirlsUndPanzer'' fandoms are essentially the same people, and both the game and the show became runaway {{Sleeper Hit}}s by drawing on each other's success, particularly in Japan where the latter's cult following started.
* ''VideoGame/LeagueOfLegends'' and anime fans in general with some overlap of FandomRivalry. It also helps to note that there are [[{{Animesque}} a lot of anime-like cliches in the game]], the Riot staff members being anime geeks themselves, and the voice actors who voiced champions in this game also work in the anime dubs themselves.
* ''{{Homestuck}}'' and ''VisualNovel/DanganRonpa'' also have a decent overlap, which makes sense since both series have a tendency to kill off their LoadsAndLoadsOfCharacters after fleshing them out and giving them unique personalities, and both series involve teens having to deal with TheEndOfTheWorldAsWeKnowIt in different ways. It's also thought the fans of the former latched onto the latter because the former is on hiatus leading up to the final act.
** Also for a short while with the ''VideoGame/{{Off}}'' fandom, though it faded into flavor of the month territory.
** It'd actually be quicker to list the fandoms Homestuck DOESN'T overlap with.
* ''Series/{{Hannibal}}'' and ''Podcast/WelcomeToNightVale'' have so many fans in common that co-producer Jeffrey Cranor attributed the spike in ''Night Vale'''s popularity on Tumblr to the simultaneous rise of the Fannibals. It's easy to see what they have in common: both shows are horror-oriented and surreal, with CreepyGood protagonists and a very morbid sense of humour, and while ''Series/{{Hannibal}}'' is a much more serious show, its fandom tends to be light-hearted and irreverent in a way that doesn't clash with the ''Night Vale'' fandom's sense of whimsy.
* Since ''Theatre/{{Wicked}}'' and ''{{Disney/Frozen}}'' have similar themes, share Creator/IdinaMenzel playing a main character, and have an IAmBecomingSong as their SignatureSong, fandoms between the two overlap a lot.
** There's also some overlap with the anime ''KillLaKill''. Both feature, anti-respectively, an IceQueen and an IcePerson (who happens to be a queen) with fitting amounts of blue in their character designs, stepping out of a hidebound, tradition-controlled isolation, [[spoiler:and both feature two formerly close sisters brought back together]]. It certainly helps that ''Frozen'' premiered during ''Kill'''s run on TV.
** In addition, the fandom of ''Film/CaptainAmericaTheWinterSoldier'' also tends to overlap with ''Frozen's'' fandom, with the conflict between the two sisters being compared to that of the one between Steve Rogers and Winter Soldier/[[spoiler: Bucky Barnes]], to the point that it is common for fans to draw Anna and Elsa as the former two.
** ''Frozen'' and ''Disney/{{Tangled}}'' is more common than any other princess movie crossover. A large portion of it has to do with a small Rapunzel cameo at the start of the film.
* Fans of {{Fighting Game}}s, particularly ''StreetFighter'', also tend to love ''DragonBall''. Considering both predominantly feature a bunch of martial artists firing off [[KiManipulation ki]] [[KamehameHadoken blasts]], it's really no surprise.
* People who hold certain political/philosophical/religious views often [[CommieNazis conflate the views of opposing ideologies]] with [[NaziNobleman other, separate opposing ideologies.]] However, this is almost always [[SubvertedTrope subverted]] in RealLife. Most of the time, if the more [[VocalMinority overzealous]] members of a group spread vitriol against one group they disagree with, they'll do the same for any other.
* Curiously enough, there seems to be a budding overlap between ''VideoGame/KantaiCollection'' and ''Webcomic/AxisPowersHetalia''. Which makes sense given that both series include [[AnthropomorphicPersonifications personified beings]] as well as involve WorldWarII and history to some degree.
* The Franchise/SonicTheHedgehog fandom may have a notorious vocal minority that seems to dislike anything that isn't Sonic (and is remarkably picky about Sonic), but even they get along well with ComicBook/{{Batman}} fans. This is most likely because these Sonic fans grew up during TheNineties, whose perception of Sonic was shaped tremendously by ''WesternAnimation/SonicSatAM'' (the Saturday morning series simply titled ''Sonic the Hedgehog'' and ''ComicBook/ArchieComicsSonicTheHedgehog'', both of which were incredibly dark series for their target audiences), and ''WesternAnimation/BatmanTheAnimatedSeries'' and Tim Burton's ''Film/{{Batman}}'' had a similarly dark and bleak feel.
* ''WesternAnimation/TheBookOfLife'':
** The fandom boasts multiple crossover fanarts, especially with ''WesternAnimation/{{Spongebob}}''.
** This movie has sparked a lot more interest in the upcoming Pixar movie based on the Day of The Dead.
** Unsurprising, considering the mutual love for friendly, skeletal protagonists, but a lot of ''WesternAnimation/TheNightmareBeforeChristmas'' fans love the film. A common headcanon is that La Muerte is related to Jack Skellington, perhaps his mother or sister.
* A lot of ''DetectiveConan'' fans enjoy ''Series/{{Sherlock}}'' due to their main influence being the SherlockHolmes canon. For some strange reason, they also enjoy ''Series/DoctorWho''.
* The Dark Souls fandom generally gets along quite well with the Berserk fan base, due to the latter being s big inspiration for the former. Many fans bond over the similarities between the two franchises, enjoying the Expies, ShoutOuts, and creating Berserk characters and builds in the games.

[[folder:Anime & Manga]]
* While they are not too similar plotwise, many fans of ''Manga/FullmetalAlchemist'' also enjoy ''Manga/SoulEater''. Perhaps because of their similar cast and production, or the similar messages and tones, the two are subject to much crossover. Also, they both ran in Monthly Shonen Gangan for nine years.
* In general, fans of ''Manga/{{Dragonball}}'' are usually fans of ''Manga/OnePiece'', due to the similar art style and tone. It helps that Creator/EiichiroOda practically idolizes Creator/AkiraToriyama.
* Basically any series by Creator/{{CLAMP}} has a significant fan overlap with any other series done by the same group. The fact that CLAMP wrote a MassiveMultiplayerCrossover, ''TsubasaReservoirChronicle'', that included characters from almost every series they've ever done essentially created a pan-series fandom.
* Creator/StudioGainax has a similar story, with fans that cross-over the studio's series more often than not. Popular cross-overs include ''Anime/{{FLCL}}''[=-=]''Anime/ThisUglyYetBeautifulWorld'' and ''Anime/TengenToppaGurrenLagann''[=-=]''Anime/PantyAndStockingWithGarterbelt''[[note]]In turn, the ''Panty & Stocking'' fandom also has overlapped with the fandom of ''Manga/{{Kuroshitsuji}}'', of all manga and anime.[[/note]].
* Gainax fans and Creator/StudioTrigger fans are having close bonds. Just look at all those cross-overs between ''Anime/KillLaKill'' and Gainax works, especially ''Panty & Stocking'' and ''Gurren Lagann''!
* The ''Anime/PuellaMagiMadokaMagica'' and TypeMoon fans are quite close to each other, and are frequently crossed over in fan art and the like. Probably due to author GenUrobuchi being the writer of FateZero. They even share memes between each other, with the ''Madoka'' fanbase using "Unlimited Gun Works" to describe Mami [[spoiler:and Homura]], and the ''Fate'' fanbase borrowing the "being meguca is suffering" meme for several ''Fate/Zero'' characters, particularly Lancer.
** Also with other Creator/StudioShaft productions. Especially ''LightNovel/{{Bakemonogatari}}'' (the glassy, modernistic backgrounds are somewhat similar, and Homura shares [[Creator/ChiwaSaito a voice]] and appearance with Hitagi [[spoiler:(and, earlier, with Hanikawa)]]), ''Manga/HidamariSketch'' (artist Creator/UmeAoki designed ''Madoka's'' characters, with Madoka herself bearing a strong resemblance to ''Hidamari'''s viwepoint character Yuno), and occasionally ''SayonaraZetsubouSensei'' for the show's emphasis on despair.
** They also seem to get along with the WhenTheyCry fanbase.
** There's also a significant overlap with the ''RebuildOfEvangelion'' fandom in the form of fanart of Homura and Kaworu as friends, mostly due to both of them being interpreted as [[LesYay having]] [[HoYay same-sex]] crushes on their respective protagonists and [[spoiler:going through multiple timelines in order to save them (a theory in Kaworu's case, confirmed in Homura's case)]]. It's also something of a RunningGag for both fandoms to comfort each other over the MindScrew and TearJerker natures of their respective series.
* The ''Manga/AttackOnTitan'' fandom and ''Anime/{{Free}}'' fandom are quite close, especially on Tumblr and Twitter, despite being from complete opposite genres. Interactions mainly consist jokes of characters crossing over, comparisons being made between them, or roleplaying.
* The ''Manga/{{Haikyuu}}'' fanbase seem to get along with ''Anime/{{Free}}'' fanbase and it's not uncommon for Free! fans to be also fans of Haikyuu and vice versa. It also doesn't help to note that both of the said shows had helped contribute the revival of sports anime in the North American fanbase in TheNewTens. [[note]][[AmericansHateTingle Sports anime had historically sold poorly in America]][[/note]]
* While not as tight-knit ''Anime/BigWindup'', ''Manga/YowamushiPedal'', and ''Manga/KurokoNoBasuke'' also tie in as FriendlyFandoms.
* Quite a few HumongousMecha fandoms have befriended one another thanks to the ''Videogame/SuperRobotWars'' franchise. This is largely because ''SRW'' doesn't just CrossOver the shows, but integrates their plotlines into a cohesive whole, which results in characters from different series befriending one another and often leads to better CharacterDevelopment and happier endings.
* ''Manga/{{Naruto}}'' and ''Anime/QueensBlade'' is [[CrackPairing one hell of this]], taking into account both series belongs to different demographics ({{Shonen}} and {{Seinen}} respectively). The only thing they have in common is both series are action-oriented and the fact, at least regarding ''Manga/{{Naruto}}'', is the fact some characters, like [[FanservicePack Ino Yamanaka]], [[MsFanservice Tsunade]], [[HiddenBuxom Hinata Hyuga]] and few other females definitely would not being too out of place in the ''QueensBlade'' universe in any stretch.
%%* There's a reason why anime and manga are lumped together so much on this wiki.
* ''{{Robotech}}'' fans are often very friendly with fans of the slightly earlier anime import ''[[SpaceBattleshipYamato Star Blazers]]''. They tend to be of the same generation and most are fans of both. They are both sister icons of OldSchool anime largely associated with the "first wave" of Western anime fandom. Also, the opinion of purists notwithstanding, the two shows are the most successful early attempts by American anime importers that attempted to preserve the integrity of their respective original Japanese series (allowing more mature themes such as death, relationships, and character development).
* ''Manga/BokuraNoHentai'' and ''Manga/WanderingSon'' fans tend to intersect and be friendly. This largely is because Marika is a Nitori {{expy}} in many ways, and the manga began just after ''Wandering Son'' ended.
* ''BinanKoukouChikyuuBoueibuLove'' and ''Anime/{{Free}}'' have a lot of mutual fans, due to them catering for the female audience through guy {{Fanservice}}. Due to the [[MagicalGirl nature of]] [[{{Parody}} the show]], it's inevitable that magical girl fans also are part of the fandom.

[[folder:Comic Books]]
* Fans of various MarvelComics books about teenage superheroes - mostly ''Comicbook/{{Runaways}}'', ''Comicbook/AvengersAcademy'', ''Comicbook/YoungAvengers'' and ''[[Comicbook/NewMutants New X-Men]]'', but also the ones with smaller fanbases like ''Sentinel'', ''Gravity'' and ''ComicBook/AvengersTheInitiative'' - tend to stick together. Later on, fans of new [[ComicBook/MsMarvel2014 Ms. Marvel]] and ComicBook/AllNewGhostRider got added to the group.
* Franchise/SpiderMan fans and Comicbook/{{Daredevil}} fans are on quite good terms. This is greatly helped by the fact that Spider-Man and Daredevil are very close friends in-universe (to the point that Daredevil is one of the only people Spider-Man trusts with his secret identity). This also extends to other New York-based, street level heroes like the Heroes For Hire, Moon Knight, She-Hulk, and Darkhawk.
* Spider-Man fans tend to get along with {{SelfDemonstrating/Deadpool}} fans, partially due to both characters being well-known for snarky humor. It helps that the two often have really good crossovers.
* Fans of the Marvel horror line, that is books like ComicBook/GhostRider, ComicBook/{{Morbius}}, ComicBook/WerewolfByNight and Comicbook/{{Blade}}, are very friendly with each other and with Comicbook/DoctorStrange fans. In fact, a lot of fans of Marvel magic-themed characters seem to be getting along very well.
* FrancoBelgianComics, particularly ''ComicBook/{{Tintin}}'' and ''ComicBook/{{Asterix}}''.
* Fans of ''ComicBook/SwampThing'' and ''ComicBook/AnimalMan'' tend to get along. Which is ironic, since their respective [[MyRealDaddy daddies]] - Creator/AlanMoore and Creator/GrantMorrison - really don't like each other.
* Fans of Matt Fraction and Kelly Sue Deconick are extremely close with each other, which is rather fitting given that the two are married in RealLife.
* ''Franchise/{{Superman}}'' fans and Franchise/SpiderMan fans tend get along well, despite the whole DC vs Marvel thing, perhaps because the two heroes are so similar that you can't really like one and hate the other. Doesn't hurt that the two have had three crossovers to themselves and two company wide crossovers where they both appeared. The two fandoms became the other's sole confidant when the two franchises started facing the same problems.

* The fandom of the ''Film/HarryPotter'' films overlaps with that of Tim Burton's film of ''SweeneyTodd: The Demon Barber of Fleet Street'' due to the many shared actors in both films. Comments on Website/YouTube clips of the latter often jokingly refer to [[AlanRickman Judge Turpin]], [[HelenaBonhamCarter Mrs. Lovett]], and [[TimothySpall Beadle Bamford]] as Snape, Bellatrix, and Pettigrew, respectively.
* The fandoms of ''WesternAnimation/TheSecretOfNIMH'', ''WesternAnimation/AnAmericanTail'' and ''Disney/TheGreatMouseDetective'' all seem to get along with one another pretty well (as long as the topic of which film was better is avoided), with a lot of crossover fan art and fan fiction existing between them.
* Largely due to releasing around the same time and the respective protagonists' ages being close together, overlapping fandoms of the ''WesternAnimation/RiseOfTheGuardians'', ''WesternAnimation/{{Brave}}, ''Disney/{{Tangled}}'' and ''WesternAnimation/HowToTrainYourDragon'' movies became SugarWiki/RiseOfTheBraveTangledDragons.
* Fans of ''Disney/{{Frozen}}'' are also on good terms with fans of these movies, probably because of the [[Disney/{{Tangled}} Rapunzel-Flynn cameo]] and Elsa's [[AnIcePerson similar powers]] to [[RiseOfTheGuardians Jack Frost]] ([[CrossoverShip in fact, the two are often shipped together]])
* Giant monster fans of multiple franchises tend to get along very well, despite studio rivalries. {{Franchise/Gamera}} fans and {{Franchise/Godzilla}} fans are prime examples. Fan sites to one nearly always include the other and crossover fan-works are extremely common. In that vein there are plenty of people who love ''PacificRim'' and ''Film/{{Godzilla 2014}}'' for being big budget giant monster movies. They turn rival when one camp dislikes the tone or execution of the other.
* ''Disney/BigHero6'' fans with the Franchise/MarvelCinematicUniverse fans. They have come up with possible crossovers that involve Hiro joining S.H.I.E.L.D. or Baymax greeting the Avengers.

* Creator/TerryPratchett fans and Creator/NeilGaiman fans, because of their collaboration on ''Literature/GoodOmens''.
** And Creator/DouglasAdams fans overlap with both!
** And Creator/DouglasAdams fans lap over with ''Series/DoctorWho'' fans, since Adams was a writer and producer for the show, and one of his books, ''Literature/DirkGentlysHolisticDetectiveAgency'', was basically a rewrite of an unused DW script. Then Creator/NeilGaiman wrote two ''Doctor Who'' episodes, showing his love for the series, cementing these relationships.
** Back in perhaps 2005 or 6, there was a major crash on a Creator/WilliamGibson message board, so the members of that board were essentially invited to hang out on the official Gaiman forum until the site issues were resolved. They did, and the two fandoms got along so well that some members wound up participating on both boards for years.
* ''Literature/TheChroniclesOfNarnia'' and ''Literature/TheLordOfTheRings'', due to both being fantasy written by authors who were close personal friends and both had an intensely Christian worldview (which influenced their works to varying degrees). Interestingly enough, Tolkein, despite his friendship with Lewis, has stated that his dislike for Narnia calling it an illogical pastiche of mythical elements.
* Back when both series were originally coming out, the ''{{Sweep}}'' and ''Literature/CircleOfThree'' fandoms fed into each other, since they were both YA series about teenage witches coming out around the same time. There were many [=GeoCities=] sites dedicated to both.
* ''Literature/HarryPotter'' and ''Literature/PercyJacksonAndTheOlympians'' fans are best buddies. They've also allied with ''Literature/TheHungerGames'' fans (oftentimes [[FandomRivalry against]] ''Literature/{{Twilight}}'', although many ''Hunger Games'' fans also like ''Twilight'' due to StephenieMeyer's exuberant praise for the book). In any case, there are loads of "The Potter Games" and "District 9" pages with an emblem of an owl carrying a broom inside the mockingjay ring.
* Fans of [[MohsScaleOfSciFiHardness hard science fiction writers and series]] like Larry Niven, Robert Reed, David Brin, and Peter Watts tend to be pretty close-knit with each other.

[[folder:Live Action TV]]
* ''Series/JeevesAndWooster'' and ''Series/ABitOfFryAndLaurie'', due to the shared double act of Creator/StephenFry and Creator/HughLaurie.
* Creator/JossWhedon's shows sometimes seem like they just have one big fandom. A good example of the "one big fandom" phenomenon is the Whedonverse Track at DragonCon, which is literally the fan track for ALL of Joss Whedon's stuff.
* Joss Whedon's fandoms overlap with fans of TimMinear, as he wrote and produced for several of Joss' shows, as well as creating shows with similar concepts which [[ScrewedByTheNetwork met the same fate]] as some of Joss'.
* Creator/JJAbrams' shows.
* ''Series/VeronicaMars'' fans overlaps with Joss Whedon fans as well, likely because Joss himself was a fan of ''Veronica Mars'' (even making a cameo once) and because it features another snarky petite blonde title character who's a strong woman, similarly as his ''Series/BuffyTheVampireSlayer''.
* ''Series/TinMan'' and ''Series/{{Alice|2009}}'' - mostly because of their similar production staff and tone. Likewise with their literary ancestors. Baum was a fan of ''Literature/AliceInWonderland''.
* Old-school ''Series/DoctorWho'' and ''Series/BlakesSeven'' were made by the same people and shared several actors, sets, and locations, so B7 pretty much became the original adult sister show to Doctor Who. Most B7 fans are also avid Doctor Who fans.
** ''Series/BlakesSeven'' also has some overlap and friendliness with fans of ''Series/{{Farscape}}'' and ''Series/{{Firefly}}'', as both can be seen as being "the 21st century ''Blake's 7''", without being so similar as to arouse accusations of copying.
* ''Series/{{Sherlock}}'' and ''Series/DoctorWho'' have a bit of overlap and {{crossover}}ing going on (''Sherlock'' overlapping more with ''Doctor Who'' than the other way round, due to a smaller fanbase) thanks to [[Creator/StevenMoffat The Grand Moff]] being executive producer at both.
** Ever since Neil Gaiman wrote the very popular ''Series/DoctorWho'' episode "The Doctor's Wife" for series 6, one which confirmed old fan theories, and contained a general display of awesome, and returned with "Nightmare in Silver" for series 7, the two fandoms have definitely gained a friendship.
* The running gag InspectorSpacetime was very well received by both ''Series/{{Community}}'' fans and ''Series/DoctorWho'' fans.
* ''{{Smallville}}'' and ''Series/{{Supernatural}}'' fandoms have a very, very large amount of overlap, to the point where it could quite reasonably argued that they share almost the same core base of fans. The fact that during the second half of the 2000s they almost always aired one after the other on the same network certainly helped this as did the fact that they were the two powerhouse SciFi series that were basically keeping the ungrateful CW Network afloat. The then-current network president's perceived treatment of the two shows as [[NetworkRedHeadedStepChild Network RedHeaded Step Children]] (in favor of promoting shows like ''GossipGirl'' or the 90210 remake as being the network's flagship programs) led to further unity between the two fandoms, which rightly or wrongly perceived themselves as being united against a common foe (namely, the perceived indifference on the part of the execs). The massive prevalence of fanfic crossovers between the two shows is also a testament to the unity between the ''Smallville'' and ''Supernatural'' fanbases.
* ''PowerRangers'' and ''SuperSentai'' are two fandoms you'd expect to get into some variation on a SubbingVersusDubbing brawl. And yet, that does not happen. Both the fans and production crews get along extremely well (to the point that they share sets and props, and for a couple of Super Sentai opening and ending sequences in the past few years, they filmed in New Zealand using the crew for ''Power Rangers''), and forums for one will usually allow discussion of the other... The joint fandom can be expanded to include other {{Toku}} to various degrees; including ''Franchise/KamenRider'', ''Franchise/MetalHeroes'', and their [[Series/VRTroopers various]] [[Series/{{Beetleborgs}} American]] [[Series/KamenRiderDragonKnight adaptations]] ([[Series/MaskedRider except maybe one we'd like to forget]]). The Japanese production house, Toei, has been encouraging this in recent years by including crossovers as part of their {{Milestone Celebration}}s.
* Creator/StephenColbert and [[Series/TheDailyShow Jon Stewart]] seem to both share the same fandom. Makes perfect sense, since Stephen used to work on Jon's show, and they interact frequently. It's almost like ''Series/TheDailyShow'' and ''Series/TheColbertReport'' are one show with two different hosts. ''Series/LastWeekTonightWithJohnOliver'' and ''TheNightlyShow'' starring Larry Wilmore are also included since they too star ''Daily Show'' alumni.
* The Series/BandOfBrothers, ThePacific, and GenerationKill fandoms, whose fans are collectively known as the "{{Creator/HBO}} war fandom".
* ''Series/TheKingOfQueens'' and ''Series/EverybodyLovesRaymond'' take place in similar settings and had frequent crossovers, and thus share largely the same fanbase.
* Interestingly, Creator/FoodNetwork shows generally have a lot of overlap in their fanbases, but not completely. While they are largely ''friendly'' towards one another, one celebrity chef's fans will often complain that several others on the same network are "too grating" or annoying.
* There is generally a lot of overlap between fans of TNT's original shows.
* Thanks to Website/{{Tumblr}}, we get [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]][[Series/{{Sherlock}} lock]]..
** [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]][[Series/{{Sherlock}} lock]] seems to have adopted ''{{Series/Merlin}}'' into the fold and the entire friendship is most noticeable when something bad happens in one of the fandoms (whether it be the demise of a character or the end of the series) and the other fandoms take to comforting it.
*** [[ This]] post, after the Who episode "The Angels Take Manhattan", pretty well sums up the relationship.
* ''{{iCarly}}'' and ''AustinAndAlly'', despite being on rival networks (''iCarly'' on Nickelodeon and ''AustinAndAlly'' on Disney) have a friendship based around the supporters of the two major canon relationships on the show, Carly/Freddie and Austin/Ally, via both being examples of the JustFriends.
** The same can be said with both ''[=iCarly=]'' and ''Series/ANTFarm'', similar to the above example, but replace Austin/Ally with Chyna/Fletcher. Similarity, both ships have the same 1st letter in their first names (Chyna to Carly and Fletcher to Freddie).
* [[{{Trekkie}} Star Trek fans]] are known for their running feuds with fans of other Sci-fi series/franchises; notable rivals being ''Franchise/StarWars'', ''Series/BabylonFive'', and ''Series/DoctorWho''. But it seems there's a lot of warm regard, if not necessarily love, for fans of the televised ''Stargate'' shows especially ''Series/StargateSG1''. As different as the shows are, their similar takes on military science fiction/SpaceOpera and comparable places on the SlidingScaleOfIdealismVsCynicism naturally means they'd appeal to a similar group. Also, it's clear the producers of ''Gate'' pay homage, if ribbingly, to ''Trek''. To top it off, throw in the number of ''Trek'' actors who've wound up on one or the other ''Gate'' series and it's almost impossible to see this fandoms as rivals.
* For a long time on SciFiChannel, ''Series/StarTrekTheNextGeneration'' and ''[=SG1=]'' were both staple shows, sometimes airing within hours of each other.
* ''Franchise/StarTrek'' and ''[[Series/TwentyFour 24]]'' fandoms got pretty cozy what with all the former ''Trek'' actors appearing in the show in big and large parts. The connection was especially strong with ''Series/StarTrekEnterprise'' which saw Gregorty Itzin and Peter Weller doing both shows at the same time. (Itzin as President Logan on ''24'' while playing an alternate universe Starfleet Admiral on ''Enterprise''. Peter Weller portrayed a WellIntentionedExtremist on both shows!) The biggest connection was when ShowRunner Manny Coto left ''Enterprise'' after it was cancelled and became a producer on ''24''. A Coto episode of 24 even saw a Bob Justman and a Rick Berman suggested to fill two open positions (Robert Justman and Rick Berman being longtime high-ranking members of the Trek staff.)
* During TheSeventies, fans of ''{{Space1999}}'' tended to also be fans of ''StarTrek'' reruns. Trekkies of that era sometimes credit the instant success of ''Space 1999'' as one of the catalysts that convinced syndicated stations to also consider airing Trek ''reruns''. In some areas, they were aired back to back.
* Fans of one TV show made by DonaldPBellisario (''Series/MagnumPI'', ''Series/{{Airwolf}}'', ''TalesOfTheGoldMonkey'', ''Series/QuantumLeap'', ''Series/{{JAG}}'', and ''Series/{{NCIS}}'') tend to be more than appreciative of his other shows. Not to mention the fact that much of the talent, both in front of and behind the camera is recurring.
* There's quite a bit of overlap between fans of ''Series/DowntonAbbey'' and ''Series/CallTheMidwife''. More specifically, fans who ship Mr Carson/Mrs Hughes on the former are ''very'' likely to also ship Dr Turner/Sister Bernadette on the latter. It's been speculated that this is due to the tremendous amount of physical and emotional restraint on the part of each pairing.
* Fans of ''Series/{{Deadwood}}'' tend to also be fans of ''Series/{{Justified}}'' and visa versa. Both are unconventional Westerns and many regard the later show as a kind of modern day sequel to the former. It helps that they both star Timothy Olyphant and a bunch of ''Deadwood'' alums show up on ''Justified'' to the point where fans talk about which ''{{Series/Deadwood}}'' actors they'd like to see next.
* After a lot of [[FandomRivalry ugly fan hate]] from ''Series/{{Sherlock}}'' FanDumb, ''Series/{{Elementary}}'' fans has found an OddFriendship in ''Series/{{Hannibal}}'' fandom. Part of it may have something to do with ''Hannibal'' fandom avoiding the big three [[Series/{{Supernatural}} Super]][[Series/DoctorWho Who]][[Series/{{Sherlock}} Lock]] like the plague. Although ''Series/{{Supernatural}}'' and ''Hannibal'' alone get along well, due to sharing a few actors and juicy crossover potential.
** A much better example is the close relationship between ''Series/{{Elementary}}'' fandom and ''Series/{{Sleepy Hollow}}'' fandom, which enjoys quite a bit of overlap in fanbases due to both shows having racially diverse casts anchored by well-rounded women of color protagonists. ''Sleepy Hollow'' also has fan overlap with ''Series/{{Scandal}}'' for similar reasons, despite being in totally different genres.
* ''Series/TheWestWing'' and ''Series/TheXFiles'' fandoms often overlap, despite the shows' ''very'' different worldviews on the US government. The overlapping casts might have something to do with it.
* ''ProjectRunway'' and ''RuPaulsDragRace'' have a significant viewer overlap, and long time viewers of ''Project Runway'' will recognize Santino Rice on the judging panel for ''Drag Race''. Both shows also have a significant LGBTFanbase due to the sheer number of queer contestants on both shows.
* The "Shondaverse" of shows including ''Series/GreysAnatomy'', ''Series/PrivatePractice'', ''{{Series/Scandal}}'' and ''Series/HowToGetAwayWithMurder'' pretty much overlap rather easily as creations of Creator/ShondaRhimes, as the casts of the shows usually have a good presence on social media and encourage viewership of each other's shows; same with the fans. The actors move between the shows very easily, pretty much acting like an extended family and also pushing their cast mate's outside projects with ease. Several of them are also married in real life to other cast and crew members of Shonda shows.
* ''ThirtyRock'' and ''ParksAndRecreation'', definitely helped by the long lasting friendship between the respective leading ladies, TinaFey and AmyPoehler

* Most jazz and classical music fans and players will like each other and go to each other's concerts.
* Metal bands which don't have a rivalry usually have some overlap.
** This is subverted by Metallica and Megadeth who do have rivalries but have tons of shared fans who appreciate both bands. Both fanbases appreciate Mustaine's recordings with Metallica such as No Life Till Leather, and in fact, the latter are how a lot of Metallica fans got into Megadeth.
* Franchise/KagerouProject and Franchise/EvilliousChronicles fandoms, to the point that most fans are fans of the other one involved. Mainly due to that both are epic RockOpera franchises(Evillious more than Kagerou Project), and use Vocaloid to create CrowningMusicOfAwesome. In Tumblr, Kagerou Project also shares many fans with other Vocaloid song series that have original characters, such as Shuuen no Shiori Project and Mikagura School Suite.
* YukiKajiura and YokoKanno have both this and FandomRivalry, depending upon the specific persons talking.
* Fans of the Music/FooFighters and Music/QueensOfTheStoneAge seem to get along well, since their front-men are involved in several projects together (DaveGrohl has even guested on a few [=QotSA=] albums) along with being poster-boys for modern alternative rockers' habit of [[AttentionDeficitCreatorDisorder having too many damn side-projects]].
* Fans of Queens of the Stone Age and Music/NineInchNails are also quite friendly; it helps that the two bands have toured together, and performed together at the 2014 Grammys (with Dave Grohl and [[Music/FleetwoodMac Lindsey Buckingham]], to boot).
* Fans of RedHotChiliPeppers like FooFighters because the bands are long time friends. They toured together in 1999 and did some MTV specials together. RHCP fans who are fans of Dave Navarro's time in the band tend to like JanesAddiction too, especially as Flea was briefly in the band.
* Music/{{Nightwish}} and SonataArctica share a lot of fans, probably because the bands have toured together and the members are friends.
* Music/MrBTheGentlemanRhymer and Music/ProfessorElemental have both this and FandomRivalry, depending upon the persons talking.
* The fandoms of Music/ToriAmos, Music/{{Bjork}}, and Music/PJHarvey have a lot of people in common. It's probably because they all started their solo careers during the early '90s and [[ were in an interview together.]]
* Music/{{Otep}}, Music/AmandaPalmer and Music/EmilieAutumn. They're apparently all friends IRL. Also, to some extent, CourtneyLove and EmilieAutumn(due to the fact that Emilie was in Courtney's backing band), but that sometimes turns into FandomRivalry instead.
* Music/TupacShakur fans and TheNotoriousBIG fans [[FandomRivalry used to not get along.]] Then, 1997 came around with both their deaths, and they are now far more amicable on account of DeadArtistsAreBetter taking effect.
* Music/EnterShikari fans and Hadouken! fans. We don't know the exact reason, but it's nice to be friends, right?
* Thanks to many world tours and live concerts made together, together with similar sounding music, Music/{{Goldfrapp}} and Music/{{Ladytron}} have a severe fandom overlap.
** Ladytron named themselves after a song by Music/RoxyMusic. Music/BrianEno, former member of Roxy Music, is a fan of them. So, yeah, Ladytron's fandom is also in good terms with the ones of Roxy Music and of Brian Eno.
* MelodicDeathMetal bands Insomnium and Omnium Gatherum have very strong ties with each other, to the point where they both share a huge portion of their respective fan bases and the two bands are collectively known as Insomnium Gatherum. They also share a guitarist (Markus Vanhala) which has only served to increase their collective fanbase.
* Music/PinkFloyd fans tend to like Music/KateBush because Pink Floyd guitarist David Gilmour discovered her and has appeared on several of her albums.
* Music/DanBull fans tend to get along well with fans of LetsPlay/InTheLittleWood and to a lesser extent the LetsPlay/{{Yogscast}}, due to Dan recording tracks with both of them and getting along especially well with the former. Similarly, his fandom have developed a growing relationship with ''WebVideo/EpicRapBattleOfHistory'' fans, in part due to Dan's [[KnightOfCerebus terrifying]] depiction of Jack the Ripper.
* IcedEarth and BlindGuardian fans have coexisted since the bands toured Germany together in the early 90s and became fast friends. When Jon Schaffer (of IcedEarth) and Hansi Kursch (of Blindguardian) formed their side project Demons And Wizards and released two albums, which solidified the connection in the eyes of fans.

[[folder:Professional Sports]]
* New York metro area baseball and football fans generally divide in the following way: fans of the New York Yankees baseball team generally are also fans of the New York Giants football team, and vice versa; meanwhile, the Mets baseball fans are generally also fans of the New York Jets football team. The intra-city fandom rivalry between the Yankees and Mets and the intra-''stadium'' rivalry between the Giants and Jets helps add to this, as does the fact that before Giants Stadium was built, the Yankees gave the Giants a home at Yankee Stadium, while the Mets played host to the Jets.
** It should also be noted that the Yankees/Giants fans and the Mets/Jets fans in New York City are generally united in their mutual love for the New York Knicks basketball team. However, the Yankees/Giants and Mets/Jets fans in [[{{Joisey}} NEW JERSEY]] often root for the Brooklyn Nets basketball team, which played for a long time in Jersey. Mets/Jets fans in Jersey who support the Nets, often proudly proclaim their love for "Mets, Jets, and Nets!"
** Also, Yankees/Giants fans tend to root for the Rangers hockey team, and Mets/Jets fans support the Islanders (although fans from both fantoms who live in New Jersey will often root for the Devils).
* Houston Texans and New Orleans Saints fans are generally amiable, even when facing each other.
* In the UK and some commonwealth countries, there's a lot of overlap between people who follow {{Cricket}} during summer and people who follow RugbyUnion during winter, perhaps because both are traditionally the sport for the rich (with the working class preferring RugbyLeague or TheBeautifulGame, depending on region).

* In the ''Theatre/{{Wicked}}'' section it's almost heresy not to have seen ''{{RENT}}'' or at least know the basic plot. It's probably something to do with the large number of shared actors especially Idina Menzel but there have been ''Theatre/{{Wicked}}'' actors playing ''{{RENT}}'', ''{{RENT}}'' actors playing Wicked, crazy crossovers, songfics with songs from the other musical and just odd references in fics.
* Fans of ''Theatre/ThePhantomOfTheOpera'' and ''Theatre/LesMiserables'' also tend to get along quite well (though many fans will, in the end, [[FandomRivalry pick one show over the other as their "favorite").]] It helps that both shows debuted around the same time in the UK and US, have similar music styles, and have become hallmarks of modern musical theatre. Plus, lots of performers over the years have starred in both shows. (The shows' respective 25th anniversary concerts shared quite a few performers, and Colm Wilkinson and John Owen-Jones -- fan favorites in the lead roles of both shows -- appeared in the encores of both events.)
* At least on Tumblr, there's a good deal of fandom overlap for ''Theatre/{{Matilda}}'' and ''Theatre/CharlieAndTheChocolateFactory'', two West End musicals based on beloved Creator/RoaldDahl novels (the two shows also share a choreographer).

* ''Franchise/GIJoe'' and ''Franchise/{{Transformers}}'' fans usually get on well and {{Shout Out}}s between the two are common. It helps that the two series are basically a SharedUniverse.
** ''Franchise/MyLittlePony'' fans also get along with with Transfans and Joefans, the three franchises being all owned by Hasbro. Although there was some friction caused by the more [[FanDumb outspoken]] fans of all three groups, many regard the series as like siblings. When Howard Stern made a harsh criticism against the Pony fandom, the level of raging BigBrotherInstinct coming out of the Transfans and Joefans was huge.
** Likewise, many fans of ''WesternAnimation/DanVs'' also get along well with the MLP fanbase. Both shows are on TheHub as it is.
* ''Franchise/MyLittlePony'' fans are typically friendly with ''Breyer'' fandom; Breyer makes more realistic horse toys. Likewise many Pony fans get along with the ''Franchise/CareBears'', ''Franchise/LittlestPetShop'', and ''WesternAnimation/StrawberryShortcake'' fandoms.

[[folder:Video Games]]
* BioWare fandom doesn't seem to care which game is better or not. If you find someone writing fanfic for [[Franchise/MassEffect Shepard]], chances are they'll also have a [[KnightsOfTheOldRepublic Revan]], and maybe a [[BaldursGate Bhaalspawn]] or [[JadeEmpire Spirit Monk]]. [[SacredCow As long as]] [[SuicideByCop nobody criticizes]] ''BaldursGate''...
* Ditto with the few and proud fans of {{Sierra}}. ''VideoGame/KingsQuest'', ''VideoGame/SpaceQuest'', ''VideoGame/LeisureSuitLarry'', ''VideoGame/QuestForGlory''... It's "Yes, please" not "which is your favorite?"
* In the ConsoleWars, fans of First and Second Party franchises of the console they are representing tend to have a good relationship with each other and are even fans of each other's games. Such examples include ''Franchise/{{Halo}} ''and ''VideoGame/GearsOfWar'' for the Xbox front, ''Franchise/SuperMarioBros'' and ''Franchise/TheLegendOfZelda'' in the Nintendo front, and ''VideoGame/{{Killzone}}'' and ''VideoGame/{{Uncharted}}'' in the Playstation front. One could think of these groups of fans as members of sports team. They might butt heads at times, but they more frequently backing each other up against the opposing 'teams'
* Know someone who plays ''TetrisTheGrandMaster''? Chances are they also play {{Bemani}} games and/or {{shmup}}s. Conversely, Bemani fans and shmup fans view TGM as a new challenge that's worth giving a shot, instead of just crazy insane invisible antics.
* ''{{DJMAX}}'' (or at least ''VideoGame/DJMAXTechnika'') and {{Bemani}}. Many ''Technika'' players have a history of playing Bemani games.
** Within the Bemani franchise, it's hard to find someone who plays exclusively one Bemani series.
* Strangely, the FightingGame fandom, in some regions, has started to blend in with, of all things, the ''VideoGame/{{Catherine}}'' fandom. At many fighting game events, you can expect to see the host running a tournament for ''Catherine'''s versus mode. Who knew that block climbing would become as popular as 20-hit combos? Also, [[ here is the finals for an]] [[VideoGame/MarvelVsCapcom3 Ultimate Marvel vs. Capcom 3]] tournament. You might notice that the game being played is not in fact [=UMVC3=], but ''VideoGame/{{Bomberman}}''. Yes, the grand finals for a [=UMvC3=] tournament was decided over a round of Bomberman.
* A lot of fans of Namco's franchises (''VideoGame/PacMan'', ''VideoGame/{{Tekken}}'', ''VideoGame/MrDriller'', ''VideoGame/{{Klonoa}}'', etc.) are also fans of Capcom's franchises (''VideoGame/MegaMan'', ''Franchise/StreetFighter'', ''VideoGame/GhostsNGoblins'', etc.) Especially since there's ''VideoGame/NamcoXCapcom'', ''VideoGame/StreetFighterXTekken'', and ''VideoGame/TekkenXStreetFighter''.
** With Creator/{{Sega}} going third-party, these fans additionally appreciate Sega's games. Which is probably why Sega is included in the ''VideoGame/NamcoXCapcom'' sequel ''VideoGame/ProjectXZone''.
** Also worth noting that, unlike the [[FandomRivalry notorious infighting]] in the ''Franchise/FinalFantasy'' Series, most fans of Namco's ''TalesSeries'' tend to be fans of multiple games - or, at the very least, they don't tend to actively hate on installments that aren't their favourites.
* Historically fans of ''Franchise/SonicTheHedgehog'' and ''Franchise/SuperMarioBros'' have been bitter to each other. However, since the death of the SegaDreamcast and the multiple games on Nintendo consoles, the two fandoms have gotten along pretty well for the most part. Until he was confirmed for Brawl, Sonic was the most demanded guest fighter for ''SuperSmashBros''.
* A great majority of ''Franchise/MetalGear'' fans are also ''Franchise/SilentHill'' fans as well. It also helps that the two franchises are from the same company. It also helps that Creator/HideoKojima has a hand in making [[VideoGame/SilentHills the next Silent Hill]].
* The VideoGame/GhostTrick and VisualNovel/AceAttorney fandoms. Mainly because, were you to make a venn diagram of the two fandoms you'd have a smaller circle (VideoGame/GhostTrick) inside of a larger circle (VisualNovel/AceAttorney). It helps that WordOfGod verified that both games are in the same 'verse. Furthermore, the VisualNovel/AceAttorney and Franchise/ProfessorLayton fandoms are practically hand-in-hand already. Imagine the glee when [[ a crossover]] was announced...
* On a meta scale, this is a recurring aspect of the games made by Creator/NaughtyDog and Creator/InsomniacGames:
** ''Franchise/CrashBandicoot'' and ''Franchise/SpyroTheDragon''.
** ''VideoGame/JakAndDaxter'' and ''Franchise/RatchetAndClank''.
** To a lesser extent, ''VideoGame/{{Uncharted}}'' and ''VideoGame/{{Resistance}}''.
* Several ''VideoGame/SpaceChannel5'' fans are, in turn, ''VideoGame/JetSetRadio'' fans too. Also, Beat and Ulala is a somewhat popular CrossoverShip.
* Probably due to a combination of both getting extremely rave reviews, having similar strategic gameplay, complete with perma-death, and similar emotional attachment to the characters, the fanbases of ''VideoGame/FireEmblemAwakening'' and ''VideoGame/XCOMEnemyUnknown'' are pretty good buds with each other.
* ''VideoGame/DevilMayCry'' (the original series) and ''VideoGame/{{Bayonetta}}''. Seeing as how both games have similar gameplay, and both have the same director, this was obvious. There's even tons of crossover art of Dante and Bayonetta.
* Bayonetta is paired up with [[VideoGame/GodOfWar Kratos]] a lot too. And [[ some people]] have also noted similarities between her and [[VideoGame/LollipopChainsaw Juliet Starling]] as well.
* The Creator/BioWare and Creator/ObsidianEntertainment fandoms have a tremendous amount of overlap and are very friendly toward one another. This ''starts'' with the creators themselves, with Obsidian often taking over projects that Bioware doesn't want to reprise. Both companies have their own flavors of high-quality, story-driven RPG, and fans tend to enjoy both.
* The ''VideoGame/MonsterHunter'' and ''VideoGame/DarkSouls'' fandoms have a very low percentage of people who hate the other series; a lot of Dark Souls fans are also fans of the Monster Hunter games and vice versa, perhaps due to similar gameplay styles. Most forum threads comparing the two are met with comments about how they love and play games from both series.
* Though [[BrokenBase some fans have differing opinions on]] ''VideoGame/{{Fallout 3}}'', it's release by Bethesda has caused a union between many fans of ''Franchise/TheElderScrolls'' and ''VideoGame/{{Fallout}}'' franchises. The main reason is presumably that both franchises place a strong emphasis on WorldBuilding in their games.
* ''VideoGame/DonkeyKongCountry'' fans tend to also be fans of other series Rare has worked on like ''VideoGame/BanjoKazooie'' and ''VideoGame/ConkersBadFurDay,'' This is because much of Rare's humour and style tends to be kept similar among the different games they've worked on, and partly because they're implied to take place in the same continuity. See Website/DKVine and their DKU concept for more information on why this is (and why all these series tend to share the same fanbase).
* The NipponIchi and Atlus fanbases.
** Similarly the ''Franchise/{{Disgaea}}'' and ''VideoGame/{{Blazblue}}'' fandoms, despite both games being entirely different genres, seem to get along with each other. It doesn't help to note the fact both games have their good mix of quirky silliness and dramatic moments and both games are known to have a strong use of {{Moe}}.
* Howabout fandoms for two games that are still in the {{Kickstarter}} phase? Both VideoGame/MightyNo9 and VideoGame/{{Shantae}} launched their Kickstarter campaigns roughly around the same time, and the fandoms for both series not only get along swimmingly but also cross promote each other! Exemplified in [[ this]] piece of art from one of artists at WayForward.
* As of the eighth console generation, PC fans and Nintendo fans seem to be on much better terms with each other than with the Microsoft or Sony communities. This stems from a few sources - among other things Wii, 3DS, and WiiU games are usually completely exclusive, which erodes the usual PC "it'll get a port" attitude, and PC gamers tend to already possess a good-sized library of Nintendo games through emulators, which makes it hard to hate them. The eighth generation, though, seems to have solidified this attitude - particularly during E3, when many bemoaned the PS4 and Xbox One as being crappy [=PCs=] in disguise that touted useless gimmicks rather than actual games, many PC gamers strongly respected Nintendo for doing something new and different and focusing purely on the "gaming" aspect.
* The ''VideoGame/VirtuaFighter'' and ''VideoGame/DeadOrAlive'' fandoms are an interesting case; the creator of Virtua Fighter, Yu Suzuki, gave Tomonobu Itagaki pointers when he was creating the first Dead or Alive game. Itagaki is infamous for his attitude towards rival companies and games, especially Namco and ''Tekken'', but Virtua Fighter is the one fighting game he has great respect for. The first DOA game was made for Sega's Model 2 arcade board, the first time Sega licensed the hardware, and the same board ''Virtua Fighter 2'' was released on. Even after Itagaki left Tecmo, Sega helped Tecmo with ''Dead or Alive 5'' and Virtua Fighters were featured as [[GuestFighter guest characters]], so needless to say the developers of both series are on good terms. The two series even have similar button layouts. Between fans, it's more of a mixed bag. Some hardcore VF fans see DOA as being shallow, while some DOA fans think of VF as being boring. On the other hand, there is still a lot of overlap between the fandoms. VF players have gotten into DOA because of the guest characters in ''5'', whom have overall have been well received by the DOA fans, and many are hoping for a real crossover between the two series in the future.
* ''VideoGame/MarioKart'' and ''VideoGame/SuperSmashBros'' fans get along well, with both being first-party multiplayer party games with popular online communities and LoadsAndLoadsOfCharacters. It helps that ''Smash Bros.'' contains a subset of ''Mario Kart'' content, and the ''VideoGame/MarioKart8'' DLC packs introduced content from outside of the ''Mario'' universe. They also share a common hatred of {{Moveset Clone}}s, TierInducedScrappy characters, and intrusive items.
* ''Sonic The Hedgehog'' and ''Mega Man'' fans are very close with one another, with most people who like one having at least a passing interest in the other. At first this was just for cosmetic reasons (both have blue-colored protagonists, mad scientist main villains, mixing of sci-fi and fantasy, heavy presence of robots, etc.) but the two series became inseperable after the comics based on them got the same writer ''and'' an absolutely awesome crossover.
* Similar to the ''Star Wars'' and ''Star Trek'' example mentioned above, ''Franchise/MassEffect'' and ''{{Franchise/Halo}}'' fans really get along with each other, possibly because their stories go in completely different but equally valid directions from similar bases. Crossovers between the series make up some of the most popular fanfictions on the net. ''{{VideoGame/Destiny}}'' seems to be joining this group, turning it into a PowerTrio of sci-fi game fandoms.
* ''VideoGame/KantaiCollection'' fans and ''VideoGame/{{Touhou}}'' fans tend to have a good amount of overlap, due to the fact that both series feature LoadsAndLoadsOfCharacters and anthromorphic personifications of Japanese history ([[UsefulNotes/KatanasOfTheRisingSun The Imperial Japanese Navy]] for the former, Japanese religion and mythology for the latter) and are ripe sources for {{meme|ticMutation}}s. Even ''Touhou'' creator ZUN himself has good things to say about ''[[PortmanteauSeriesNickname KanColle]]''.

* ''Webcomic/DinosaurComics'' and ''Webcomic/{{xkcd}}''. Even their creators are friends!
** [[CompletelyMissingThePoint But Ryan North]] [[AcceptableTargets is a computational linguist!]]
** You can also count [[Webcomic/MSPaintAdventures Andrew Hussie]] and [[{{Wondermark}} David Malki!]] as creator friends with friendly fanbases.
*** Speaking of Hussie, the ''Webcomic/DinosaurComics'' and ''Webcomic/MSPaintAdventures'' fandoms get along rather well, considering that the official forums of the former are a section of the fora of the latter. This is probably because, again, the creators are very good friends, and because of a [[{{Bathos}} very]] [[BlackHumour similar]] [[ShoutOut style]] [[SophisticatedAsHell of]] [[AntiHumour humour]].
* 910Comics (''Webcomic/TheWotch'', ''The Wotch: Webcomic/{{Cheer}}'', ''Webcomic/{{Misfile}}'', etc.) readers used to have insane amounts of overlap with ''Webcomic/ElGoonishShive'' [[FanNickname Bunnies]]. Until ''El Goonish Shive'' joined the 910Comics community, and now they're the same fandom. Same with ''ZebraGirl'', and probably others as well.

[[folder:Web Original]]
* The two superhero parody shared universes of the early days of the Internet, ''Superguy'' and ''LegionOfNetHeroes''. At least back when Superguy was active. They shared a couple of important writers in common, such as Mike Escutia and Dave Van Domelen.
* In terms of the LetsPlay/{{Yogscast}}, this happens quite a lot:
** Even before LetsPlay/HatFilms joined, their similar senses of humour, funny collaborations and similar presentation styles meant that both fandoms got on well. The fact that the two liked each other in real life also helps, and the news of them joining went down well for the most part.
** Many early fans of Music/{{Area 11}} were also fans of the Yogscast, due to Sparkles* and Parv both being part-time members, the band generally getting on well with the group and the Yogs giving the band [[ColbertBump a rise in new fans and views]]. Similarly, their fans tend to get along well with fans of LetsPlay/InTheLittleWood and LetsPlay/{{Strippin}}, since Martyn, Strippin and Sparkles* are HeterosexualLifePartners.
** Their relationship with Creator/AchievementHunter (and Creator/RoosterTeeth) fans is mostly peaceful and respectful, although there are a few disputes.

[[folder:Western Animation]]
* Many of the prominent {{Fanfic}} writers for ''WesternAnimation/AdventuresOfTheGalaxyRangers'' also wrote fanfic for ''WesternAnimation/JonnyQuestTheRealAdventures'' back in the 1990's. These days, newcomers to the fandom tend to be fans of ''WesternAnimation/XMenEvolution'' who discovered it via Red Witch and other fanfic writers.
* Many ''WesternAnimation/EdEddNEddy'' fans moved on to ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', since both shows have a similar tone, the latter show has some of the same cast and crew as the former, and the target demographic of the former (kids) is now the PeripheryDemographic of the latter (college students and internet dwellers).
** Many fans of ''ThePowerPuffGirls'' and ''FostersHomeForImaginaryFriends'' also got into ''Friendship Is Magic'' because of Creator/LaurenFaust's contributions to all three shows.
** ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fans are on very good grounds with ''WesternAnimation/GravityFalls'', ''WesternAnimation/AdventureTime'', ''WesternAnimation/RegularShow'', ''WesternAnimation/SpongeBobSquarePants'', ''WesternAnimation/InvaderZim'' and EVEN modern ''WesternAnimation/SouthPark'' fans, mostly due to certain similarities between various characters and humor (With Zim having less similarities to [=SpongeBob=] as the others). ''WesternAnimation/TheMarvelousMisadventuresOfFlapjack'' as well, since some members of the crew went on to be involved in shows such as ''Gravity Falls'', ''Adventure Time'', and ''Regular Show''.
** Going back a little further, fans of ''WesternAnimation/{{Doug}}'' and ''WesternAnimation/HeyArnold'' are very friendly with fans of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', due to the similar SliceOfLife nature between the shows. This also [[FridgeBrilliance makes sense]], considering those who [[TheNineties grew up watching the two Nickelodeon shows]] (with a ChannelHop for the former) are in the PeripheryDemographic for ''[=FiM=]''.
** Fans of ''WesternAnimation/AvatarTheLastAirbender'' and especially ''WesternAnimation/TheLegendOfKorra'' have a friendly rivalry with fans of ''WesternAnimation/MyLittlePonyFriendshipIsMagic''. Things can get pretty heated over [[FandomRivalry which of the two is better]], but there's a lot of crossover between the two fandoms, and most of those who aren't fans of both are still pretty cool with the other show.
* The fandoms of ''WesternAnimation/{{Recess}}'' and ''WesternAnimation/HeyArnold'' have grown to have a mutual respect for each other, probably due to the similarities both shows have. This used to be the reason they originally butted heads, but now that there is no threat of competition, fans of either are now often fans of both.
* There's a lot of overlap between fans of ''WesternAnimation/TheLegendOfKorra'' and ''WesternAnimation/YoungJustice''--both are slightly dark series written with a preteen/teenage crowd in mind, and ''Young Justice'' aired on Cartoon Network in the time slot right before ''The Legend of Korra'' on Nickelodeon.
** In the same block as ''WesternAnimation/YoungJustice'', ''WesternAnimation/TheLegendOfKorra'' and ''WesternAnimation/GreenLanternTheAnimatedSeries'' also have alot of fandom crossover. This is thanks in no small part to the fact that one of the writers of GLTAS, Giancarlo Volpe, worked on the previous Avatar series and he has plugged his previous teams new show several times on Tumblr (and they return the favor.)
** There's also quite a bit of overlap between the two ''Avatar'' series and ''WesternAnimation/StarWarsTheCloneWars''; in addition to the aforementioned Giancarlo Volpe also previously worked on ''The Clone Wars'', ''Clone Wars''' supervising director Dave Filoni was a director on the first season of ''WesternAnimation/AvatarTheLastAirbender''. Voice actor Creator/DeeBradleyBaker has also cited his roles in both shows to be his favorite voice acting roles.
* Much like the Creator/JossWhedon example mentioned above, fans of Creator/GregWeisman shows seem to blend into one big fandom.
* ''WesternAnimation/YoungJustice'' and ''WesternAnimation/GreenLanternTheAnimatedSeries'' fans have banded together. As the two headliners of Cartoon Network's weekend morning "WesternAnimation/DCNation" block, they air in back-to-back time slots--and they were both subject to epic [[ScrewedByTheNetwork screwing by Cartoon Network]] when they were abruptly shelved about eight hours before airing their third episode after coming off summer hiatus. Needless to say, fans want to see them back before January 2013.
** When both shows were canceled at the same time, the fandoms banded further together in support of both shows, using the FandomNickname "Symbiosi" (which, in ''Young Justice,'' is the Atlantean word for "together").
* ''WesternAnimation/AdventureTime'' and ''WesternAnimation/RegularShow''. Oh, so very much.
* There's also a considerable overlap between fans of ''WesternAnimation/GreenLanternTheAnimatedSeries'' and ''WesternAnimation/TeenageMutantNinjaTurtles2012'', as several fans of the former began to watch the latter after the DC Nation hiatus happened.
** TMNT2012 also overlaps a lot with ''WesternAnimation/SuperRobotMonkeyTeamHyperforceGo!'' due to Ciro Neili producing the former and creating the later. He throws a lot of references to monkey team into TMNT and boy have the fans noticed.
* ''WesternAnimation/{{Gargoyles}}'' and ''Franchise/StarTrek'' fandoms get along excellently considering many ''Trek'' alumni have done character voices for the Disney series, especially Jonathon Frakes and Marina Sirtis as the major antagonists, David Xanatos and Demona respectively.
* ''WesternAnimation/AmericanDragonJakeLong, WesternAnimation/DannyPhantom,'' and ''WesternAnimation/RandyCunninghamNinthGradeNinja'', all being [[KidHero Kid Heroes]] who WakeUpGoToSchoolSaveTheWorld and seem like they'd be good friends were they ever in the same universe, were given the crossover name "The Secret Trio" by fans on Website/{{Tumblr}} and occasionally overlap with the smaller ''{{WesternAnimation/Detentionaire}}'' fanbase.
** ''WesternAnimation/DannyPhantom, WesternAnimation/ParaNorman,'' and ''WesternAnimation/DudeThatsMyGhost'', because of the plot revolving around ghosts.
* Many ''WesternAnimation/SpongeBobSquarePants'' fans are usually friendly with the ''Adventure Time'' fans. Mostly because former writers from Spongebob had worked on or are still currently working on ''Adventure Time''.
* There is a case with ''Adventure Time'' and ''WesternAnimation/PhineasAndFerb'', despite the two being completely different. This is because former writers had worked on or are still working on the show. One of the creators (Dan Provenmire) was an occasional writer for ''[=SpongeBob=]'' (and a director for ''Family Guy'' episodes from Season 2-Season 5).
* Many ''WesternAnimation/HeyArnold'' fans are usually friendly with ''Rugrats'' fans due to the fact that both shows are very character driven, aired on Nickelodeon around the same time, specialized in heartwarming moments and have similarities in characters. It's worth noting that Craig Bartlett is a former ''Rugrats'' writer, and left to create ''Hey Arnold''.
* Unlike their [[SpiritualSuccessor spiritual predecessors]], ''WesternAnimation/AmericanDad'' and ''WesternAnimation/{{Futurama}}'' fans are very friendly with each other due to the fact that both shows are considered better than their predecessors, they're not as popular or as successful as their predecessors, they have a similar style of humor and they both share some writers and producers.
* In the 2000s, many ''WesternAnimation/SpongeBobSquarePants'' fans and ''WesternAnimation/FamilyGuy'' fans liked both shows and were very friendly with each other due to the facts that both were initially given bad treatment by the networks, were both cancelled around the same time and revived in 2005, similar jokes and characterization and both suffered through a heavy dose of SeasonalRot around the same time for similar reasons. Not to mention that they both replaced established franchises as flagship shows (''WesternAnimation/{{Rugrats}}'' and ''WesternAnimation/TheSimpsons'').
* While there is still something of a mild rivalry going on among some [[VocalMinority vocal minorities]], for the most part fans of ''Adventure Time'' and ''WesternAnimation/StevenUniverse'' get along. This is thanks to the fact that the creator of Steven Universe, Rebecca Sugar, is a former ''Adventure Time'' writer who was known for writing fan favorite episodes like "[[TearJerker Simon and Marcy]]," and they both originally aired on Cartoon Network on Monday nights within the same hour (although Steven Universe has moved to Wednesdays). Can also overlap with ''Regular Show'', also due to all three shows airing within the same hour.
* Fans of ''WesternAnimation/LooneyTunes'' and ''WesternAnimation/TomAndJerry'' get along very well for the most part.
* The FiveManBand of [[TheEighties 1980s]] cartoons is often said to be composed of ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'', ''WesternAnimation/{{Voltron}}'', ''WesternAnimation/{{Thundercats}}'', ''WesternAnimation/TheTransformers'' and ''WesternAnimation/GIJoeARealAmericanHero''. And, if you talk to your typical children of the Eighties, you'll see it's for good reason.
* ''SpongebobSquarepants'' and ''RegularShow'' as well, at least for the fact that the shows have similar characters.
* Just like The Secret Trio and SugarWiki/RiseOfTheBraveTangledDragons, fanbases of certain animated shows- with KidHero stars battling the supernatural and strange -have united to create a composite team-up universe, featuring the Mystery Kids. The most frequent members of this team-up are the protagonists of GravityFalls, {{Paranorman}}, {{Film/Coraline}}, {{Psychonauts}}, and to a lesser extent, InvaderZim and DannyPhantom.