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Some fandoms just mesh well. The timelines and continuities can be made to fit without much difficulty, they might have similar premises or ideologies, and they have characters that you just know would love (or hate) to meet each other. The chances of having them cross over increase if they're made by the same company, written by the same author, and/or have similar character designs.

Some fandoms are so accessible that they're crossed with just about everything else.

Related to Fandom-Specific Plot. A common form is the Doppelgänger Crossover. Contrast the Weird Crossover.


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    Anime & Manga 
  • Sailor Moon:
  • Fullmetal Alchemist/Harry Potter. For no real reasons other than that both have involved the Philosopher's Stone and take place in fantastic versions of European countries. In the anime/movie Ed even travels to an Alternate Universe, which could easily be changed to the HP one.
  • As of this writing, Naruto has over 11,200 cross-over stories in its crossover section on, plus however many in the main section. Naruto fits just about anywhere, apparently.
    • With Bleach, because they have the same audience.
    • With One Piece, if only for the Ninjas vs. Pirates.
    • With Teen Titans (2003), mostly because of Raven/Naruto, two people with pasts involving demons. It helps that Teen Titans ends with Raven unattached.
    • With Harry Potter. Bringing in the characters as transfer students is more than just popular, but numerous stories where Harry discovers he's an Uchiha/Hatake/insert-bishie-indicating-surname-here (or is raised as a member of that family). Team Seven (or just Kakashi) also seems to get themselves hired out as long-term bodyguards often enough for Tsunade to pay off every single gambling debt she's ever had, plus interest.
      • It's worth noting that even among the more serious stories here, the two universes have plenty of common similarities - a singled-out Chosen One, a snake-themed villain with an obsession for immortality, a school of special arts, a group of three young heroes the same age (two boys, one girl), a long-running Myth Arc, large cast...
  • Tsubasa -RESERVoir CHRoNiCLE- is effectively the anime/manga version of Doctor Who, due to its premise allowing characters to travel between different universes.
  • Inuyasha and YuYu Hakusho, seeing how they both deal with demons, and separation of worlds makes a good explanation of why youkai seemingly no longer exist in the modern era.
  • Neon Genesis Evangelion crosses over with the Cthulhu Mythos a lot. Besides fanfics there are even tabletop games whose premise is mostly Eva plus Cthulhu. Both are very bleak, highly psychological, symbolism and mysticism-filled, Cosmic Horror Stories about man's arrogance and place in the universe. Eva focuses a bit more on the human, psychological side while Lovecraft on the incomprehensible monster side and so writers like the mesh the two.
  • A lot of people have made fanvids of Trigun to Firefly's theme song.
  • Digimon and Pokémon are incredibly common crossover stories, most of the time with each other, but crossovers with other series aren't uncommon.
  • The Doctor being an alien, time traveler, psychic, and cross-dimensional traveler with the preferred alias of "John Smith" makes Doctor Who hard to resist for Haruhi Suzumiya crossover fanfic writers.
  • Crossovers between Code Geass and Mobile Suit Gundam 00 are also common. Perhaps it's because of that Enemy Mine plan that both Lelouch and Celestial Being employ. Bandai Namco Entertainment made it official when both series debuted alongside each other in the Second Super Robot Wars Z.
    • Not to mention Code Geass and Death Note, mostly due to both shows having Villain Protagonists who are Magnificent Bastards, have a following (one's a rebellion, the other's a cult), have powers involving death (not really, but Lelouch's most memorable use with his Geass would be his first command, which was simply "Die!"), and have secret identities.
  • Fans of Puella Magi Madoka Magica tend to also like Ume Aoki's other works, Hidamari Sketch, which is more conventionally Moe. Considering what kind of story PMMM is, the adjoining of those two is widely disturbing. Clearly this has been noted by the producers; a commercial for the Puella Magi Madoka Magica Movie appeared in the first episode of the fourth season of the Hidamari Sketch anime, aired early October 2012. This is hardly coincidental, as producers purchase the entire Otaku O'Clock block and has a free rein on what commercials to put on.
    • For every fandom, there are a few fics that crossover with this anime. They're usually about the main cast of said fandom becoming Madoka-styled magical girls/boys.
  • Pretty Cure:
  • Yu-Gi-Oh!: In pixiv fanart, Zoodiac monsters are often seen with Kemono Friends because of their similar aesthetics. Here's a fanart treating Serval as a member of the Archetype.
  • Yuki Yuna is a Hero and Puella Magi Madoka Magica have many similarities and many differences. Fans have enjoyed crossing them over, especially when it comes to Togo and Homura meeting.
  • Lyrical Nanoha and Puella Magi Madoka Magica are two popular Darker and Edgier magical girl series that commonly get crossed over.
  • Sports Stories are often crossed with each other due to their mundane high school (or sometimes college) setting and shared audience. Common examples are Haikyuu!!, Yuri!!! on Ice, Free! and the Production I.G version of Run with the Wind. The latter is sometimes crossed with Haikyuu!! because of the Memetic Mutation of calling Kakeru the running version of Kageyama. Some Fanfics depict them as being related in some way.
  • Many fan-works revolve around the basketball teams from Slam Dunk and Kuroko's Basketball playing against one another.

    Comic Books 

    Film — Animated 

    Film — Live Action 
  • Harry Potter meets Star Wars quite often as well. Both involve singled-out main characters separated from everyone else by supernatural affinity, with a tight clique of close friends leading a resistance against a villain related to the hero in some way, both series use similar tropes and myth arcs, and The Force makes a handy explanation of Potter magic. It takes quite a bit of explaining to work the two together, however.
  • The Avengers crossover pile is growing at a near-exponential rate, closing in on second place in the films category for crossovers on It also helps that the world has a lot of fleshing out to do and a lot of potential in terms of crossing over, often with traditional Marvel properties like Spider-Man (which became movie canon in 2016) and the X-Men.
  • This is common within the horror genre, where stories are constantly filled with shout-outs that leave writers with plenty of Fanfic Fuel. Some crossovers that eventually grew popular enough to become canon in their own right include Alien vs. Predator (evil aliens that both featured in badass '80s action/horror flicks), Freddy vs. Jason (two of the most iconic villains of '80s slasher movies), and the Universal monsters as a whole (classic '30s and '40s horror films made by the same studio, in one of Hollywood's first examples of a shared movie universe).
  • Godzilla, Gamera, and Ultraman, thanks to the shared love of Kaiju. Usually, it's having their characters fight each other, but sometimes they have heroic teamups. Expect to see Pacific Rim sometimes as well.
    • This reaches the logical conclusion with the Amalgam'Verse, as shown in the fanfics The Bridge and Godzilla: New Era- nearly every kaiju story ever, from the aforementioned Godzilla, Gamera, Ultra Series, and Pacific Rim, straight through to Cloverfield, Gorgo, and even numerous American 50s giant monster movies, have been fused into a single world, using the Heisei Godzilla series as the base and building from there. Though at first it existed only to provide background for The Bridge, a crossover with My Little Pony, it has since been expanded on via New Era and the series of short stories called Tales of the Amalgam'Verse. Here's the full reading list and the roster for the spinoff Humanity’s Stand, which covers most of the main kaiju players currently on Earth. Regrettably, an up-to-date roster for the entire Fan Verse is not currently available. note 

  • It's not so much that it does mesh well with everything as that everyone and their cat has heard of it, but Harry Potter has been crossed over with nearly everything. There's one Harry Potter/Disney's Aladdin crossover, completely disregarding the huge time difference and the not exactly friendly attitude Agrabah would have towards wizards once it was not only a Muslim city, but a Muslim city that has "getting hugely screwed over by a sorcerer" in its recent history.
  • Maximum Ride and The Twilight Saga seem to get crossed over quite a lot for such an odd combination.
  • The Cthulhu Mythos fits well with anything vaguely fantasy, horror, sci-fi, or mystery, from Sherlock Holmes to Dungeons & Dragons to the Marvel Universe. Hence CthulhuTech. There was even a Batman Elseworld that revolved around Arkham Asylum crossed over with the Cthulhu Mythos, making it a professional version of this trope.
  • Good Omens is a natural crossover with Supernatural, seeing as SPN's demon Crowley was modeled after Good Omens' demon Crowley, so there's a lot of meshing of their respective apocalypse/heaven-and-hell/demons-and-angels plots. It's also a natural crossover with with Lucifer (2016), another series that has a Noble Demon protagonist who's fond of humanity despite his infernal roots.
  • The Mortal Instruments and The Infernal Devices don't have a huge crossover file yet, but it's steadily building. Considering the fact that The Infernal Devices is really just a prequel and many characters are either ancestors of characters in The Mortal Instruments or present in both series (such as Magnus Bane and various vampires), it's not surprising.
  • Percy Jackson and the Olympians (and The Heroes of Olympus, naturally) have major crossover fuel with Pokémon and The Kane Chronicles. Of course, the latter is in the same universe anyway, as is Magnus Chase and the Gods of Asgard.
  • Animorphs and Maximum Ride. People love to have the Flock meet Tobias, since they're both bird/human.
  • Land of Oz, Peter Pan, and Alice's Adventures in Wonderland due to their similarly whimsical feels. As both the Land of Oz and Alice's Adventures In Wonderland series are in the public domain, there are even for-profit works which cross them over.
  • Warrior Cats:
    • If a work stars cats then it's likely been crossed over with Warriors.
    • Warriors and Watership Down has crossed over due to Friendly Fandoms. It also adds a new layer to the stories because one stars cats and the other stars rabbits.
  • Worm and RWBY have a surprising number of crossovers. At time of writing, lists more Worm/RWBY crossovers than Worm/My Hero Academia crossovers, despite the latter work having significantly more in common with the former (e.g. superheroes). Only four other franchises have more Worm crossovers than RWBY, all of which are significantly more well-known than RWBY.

    Live-Action TV 
  • House Fan Fic is famous for its crossovers. Notable ones are Batman, Angel, Bones, and Doctor Who. There are also a few with Firefly, including one with River (where she really sparks his curiosity due to how strange her case is; it's never explained how she got there). It's not uncommon to find a crossover between House and Blackadder, either, considering that the latter also stars Hugh Laurie, though in a complete 180 from his role in House.
  • There is a LiveJournal community specifically for crossovers between Heroes and Supernatural. The fandoms overlap because if you want broslash, you're pretty much going to have to be a fan of at least one of them.
  • There is also quite a few crossovers between Supernatural and NUMB3RS, as both shows are about brothers that work together.
  • Smallville/Batman, especially Bruce/Lex and/or Bruce/Clark. Of course, the fact that there were plans to bring a young Brucenote  to the town helps matters a bit. Plus, the show was originally going to be about young Bruce.
  • Buffyverse:
    • In general, if a show, movie, book, or game has a young Action Girl protagonist, it’s probably just a matter of time before somebody writes a fix about her finding out she’s the new Slayer.
    • Firefly is a big one, due to both shows being created by Joss Whedon. From Buffy the Vampire Slayer, Xander (or, less frequently, Willow or Dawn) gets sucked into a portal, dimensional rift, etc., and ends up aboard the Serenity. Alternatively, River Tam is a Slayer, with the Academy as a corrupted Watchers Council. One fan attempt at Canon Welding between the two universes, called the “Universal Slayer Theory”, even treats the latter setup as fanon while also tying in other Whedon works.
    • Stargate SG-1 crossovers are so ubiquitous in the Buffy fandom that in many cases they're not even labeled as crossovers unless they cross with a third fandom. There's a Halo/Buffy/SG-1 fic where Xander goes as John-117 on Halloween (the timeline problems there are never addressed) and things change... a lot. It's good if you can ignore the timeline problems. Oh, and Xander actually remembers Jessie and actually still has his death as a source of grief.
    • Doctor Who is such a common crossover that fans can easily start mixing canon from both in their minds. Both expanded universes have had brief crossovers from the other universe — an Eighth Doctor novel has a cameo from Spike, and the Tenth Doctor and Rose make a cameo appearance in Buffy season 8.
    • Another one is with Merlin, due to Anthony Head being a major player in both series. It usually involves Buffy getting transported back to Camelot somehow, but a few other variations exist as well.
    • Angel and Buffy get crossed with Bones a lot because David Boreanaz’s characters are quite similar in some ways. The theory of Booth being Angel’s Shanshu, or reward of becoming human, has quite a few fans.
  • Battlestar Galactica eventually gets crossed with any running Sci-Fi due to the Lost Colony premise. For instance, the refugee fleet entering Star Trek's United Federation of Planets, with the resulting political fallout and attacks by the Cylons, is a common idea.
    • In particular, fics crossing over Galactica with the Stargate-verse are common as mud, perhaps because SG-1, Atlantis and BSG all used to air on Syfy on the same night originally. Such fics will usually have the following features and plot points, almost certainly due to a massive upsurge of Follow the Leader after Reunions Are a Bitch pioneered them:
      1. The Cylon attack that kicked off the events of the series either never happened, or went drastically the reverse of how it happened in canon, with the Colonials winning.
      2. The Colonials are/become a militaristic regime, bent on conquest.
      3. Said conquest includes conquering their "rogue" thirteenth colony, Earth.
      4. The Colonials completely underestimate how much curb-stomping a couple of Prometheus-class ships equipped with Asgard weaponry can dish out.
    • Strangely, the number of crossovers between the original '70s version of Galactica and Star Wars can probably be counted on one hand, even though the former was very heavily influenced by the latter.
  • A crossover of yesteryear: Highlander and Forever Knight. There are a lot of those.
  • Doctor Who has a face that's 'launched a thousand ships'. Travel through time and space tends to facilitate crossovers with anything not too cartoonishly illogi- oh, who are we kidding?
    • Kamen Rider Decade is effectively the Toku/Japanese version of this.
    • Quantum Leap is effectively the American version of this, as well. Double points that it's perfect for writing a Fix Fic.
  • Supernatural actually gets crossed with a lot of stuff, but most often with Smallville (which almost always includes Dean/Chloe, though there's an occasional Sam/Chloe or Dean/Lois fic out therenote ) and Buffy the Vampire Slayer (almost always including Dean/Buffy, Dean/Faith, or Sam/Faith, though some Sam/Willow, Spike/Dean, Angel/Dean, and/or Spike/Dean/Sam fics show up sometimes). The number of crossovers with Doctor Who, Torchwood, and Heroes are growing rather quickly. Crossing with Dark Angel is also common, as Dean shares the same actor (Jensen Ackles) as the identical twins Ben and Alec, and since the latter two are genetically engineered and clones, it's an Obvious Crossover Method to say Dean is the person they were cloned from.
    • Superwho (Supernatural crossed over with Doctor Who) has almost a fandom of its own. Apparently the writers of Supernatural caught wind of this, since they named a new character "Amy Pond".
      • It can be considered a Doppelgänger Crossover: Mark Sheppard played both Crowley in Supernatural and Canton in Doctor Who.
    • Superwholock (Supernatural crossed with Doctor Who crossed with Sherlock) has become increasingly popular, uniting Wholock (see below) and Superwho in one all-encompassing fandom.
      • And to this can be added Superwhoavengerlock, which is what you get when you add The Avengers.
      • Merlin and Harry Potter may or may not come along for the ride.
      • It's no surprise that Teen Wolf has been enthusiastically and seamlessly crossed with Supernatural, but it remains to be seen if it will join the Superwholock party.
    • There's a decent amount of crossover with Police Procedural shows like NCIS and Criminal Minds, mostly due to the recurring Winchester brothers chased by the FBI subplot.
  • In general, different Urban Fantasy and present-day Sci-Fi (think Sg-1 or Doctor Who) universes tend to mix well as they all share many common themes - The Masquerade, Our Monsters Are Different, Fantasy Kitchen Sink, Like Reality, Unless Noted as well as a generally darker and more cynical tone. Writers like the challenge of mixing and combining different universes as well as bouncing the usually snarky, cynical yet undoubtedly heroic characters against each other.
  • For some reason, Sherlock and Good Omens crossovers are quite popular. It could have something to do with the fact that the most popular pairing in each fandom (Sherlock/John and Crowley/Aziraphale, respectively) have parallels, making this a rare case of cross-fandom Ship Mates. It doesn't hurt that both stories take place in Britain.
  • The shows in the Disney Channel Live-Action Universe and Nick Verse since the rise of online fandom are crossed over constantly regardless, as they are all set in the same rough time period and genre (Kid Com) and most people in their target age groups watch multiples of them and thus have the knowledge to use all the characters in cross-overs:
    • iCarly, Drake & Josh, Victorious and Zoey101 have many crossovers, because of their shared universe. Nevel/Megan, Freddie/Cat, Sam/Jade are some popular crossover pairings. The four shows have crossed over in canon as well. In the iCarly episode "iStart a Fan War," Craig, Eric, Gavon, and Stacey all attend the iCarly fan panel. In Victorious, Helen from Drake and Josh is the new principal at Hollywood Arts, and there is the "iParty With Victorious" crossover with iCarly. There are also two more shows in the works that will join this set, with Sam & Cat being a crossover Spin-Off with Cat Valentine from Victorious and Sam Puckett from iCarly, as well as a Spin-Off with the character Gibby from iCarly.
    • Camp Rock is a very popular crossover for Hannah Montana, Wizards of Waverly Place and some with Sonny with a Chance/So Random!
  • Heroes and Lost get crossed over a lot thanks to their overlapping fanbases and similar styles.
  • Supernatural and Lost get crossed over a lot for some unfathomable reason. Occasionally it's a Doppelgänger Crossover due to Mark Pellegrino and Titus Welliver appearing in both, but that doesn't account for even half of the fic out there.
  • Star Trek/Star Wars crossovers are pretty common; not only are they the two biggest science fiction franchises, but nerds often write them as a side effect of arguments over which side's ships are more powerful.
  • NCIS and Criminal Minds tend to get crossed over with each other a lot. It even shows with the NCIS crossover page and the Criminal Minds crossover page. Sort either page by popularity makes this abundantly clear.
  • Castle and Bones seem to be crossed over a fair bit. There's also more than a few crossovers with Firefly that tend to suggest some kind of connection between Richard Castle and Malcolm Reynolds (although the sheer amount of Actor Allusions Castle makes to Firefly help this along).
  • If they're not crossing their Disney properties with Kingdom Hearts, they'll cross it with Once Upon a Time (if they're not crossing those two with each other to begin with). For even more fun, the writers have pretty much out and established that it's in the same universe as Lost and TRON. There have also been fanart crossovers with Mass Effect due to the same actor playing Kaiden Alenko and Jiminy Cricket.
  • Highlander lends itself to a lot of crossovers, because it's relatively easy to pick a character from another show and make them an immortal. Especially if they're an orphan. It also frequently crosses with Buffy the Vampire Slayer due to the existence of a Watchers organization in both worlds.
  • Because of Inspector Spacetime, Community and Doctor Who fics are getting increasingly common.
  • American Horror Story's most popular crossover? It's with Glee, of all shows. This is likely due to the fact that both shows were made by the same guy, Ryan Murphy. Quinn/Tate is a particularly common pairing for such crossovers.
  • Sanctuary and Warehouse 13 match up quite well. They have similar but non-conflicting premises, where Sanctuary collects fantasy creatures while Warehouse 13 collects fantasy devices, and both of them are private entities secretly supported by governments to contain the Masquerade. They both have flashbacks and important plot events that happened in late 1800s: on Warehouse 13 the change from Warehouse 12 to 13 and H. G. Wells backstory, and the vampire blood on Sanctuary and the founding of Sanctuary itself.) There's even a shared Historical Domain Character, Nikola Tesla, who is still alive on Sanctuary and helped build Warehouse 13. Sadly, neither of these properties is very fanficed, and thus crossovers sparse.
  • The Daredevil (2015) Netflix series has a lot of fix about Matt and Hawkeye falling into the same dumpster, which often segway into discussions about how one is blind and one is deaf.
  • The Walking Dead frequently gets crossed over with, of all things, the cult action film The Boondock Saints, on account of both starring Norman Reedus as a badass Anti-Hero.
  • The Sentinel gets crossed with a variety of other series. It makes may be a standard crossover of "The cast of the Sentinel meet X" or the Sentinel/Guide concept may be used for a Fusion Fic.
  • At least three shows have done an "Alan Sugar pitches on Dragons' Den" sketch: Dead Ringers, Harry and Paul, and a Self-Parody by the original shows for Comic Relief.

    Tabletop Games 
  • Warhammer 40,000 and Neon Genesis Evangelion. Hell, Warhammer 40000 has probably been crossed over with pretty much everything by now.
    • You could have any fictional setting just be an undiscovered world or sector of the galaxy, and any magic can simply be handwaved away as "Warp sorcery."
    • Warhammer 40,000 and Mass Effect do well together. Of note are Hammerhand and Angels of the Storm
    • Though you wonder that there haven't been more 40k/Dragon Age crossovers, what with the ridiculously similar magic system and the Qunari (who are Tau, but bigger and grey).
  • Warhammer Fantasy and A Song of Ice and Fire / Game of Thrones do well together, since both are firmly set in The Dung Ages where the worst historical abuses of the feudal system are daily life.
  • Exalted is often crossed over with Worm. (The two universes, despite being very different variations of the fantasy genre, share similar themes.) Or, to quote Ryuugi:
    Imagine a setting in which enormously powerful super-weapons called 'Shards' attach themselves to humans in extraordinary situations, giving them the power to change the world to their will, but painting their emotional highs and lows in broader strokes. The sources of these shards are tremendously powerful superbeings, one of which is a shining golden man.
    What setting am I talking about?
  • A variation of this can be seen within Dungeons & Dragons with adapting specific adventures to settings they weren't originally intended for and few combinations have become pretty common among the Dungeon Masters.
    • Third Edition campaign Red Hand of Doom and Fifth Edition Tyranny of Dragons are often placed in the Dragonlance universe, due to the fact that the Big Bad of that setting, dragon queen Takhisis, is a blatant Expy of the Big Bad of the two modules, dragon godess Tiamat.
    • Dungeon Magazine's final campaign, Savage Tide features a whole part on the famous Isle of Dread. As such it is very common to adapt it to Mystara, where Isle of Dread was originally placed.

    Video Games 
  • Halo:
  • Kingdom Hearts:
    • With just about anything, really. It helps that Kingdom Hearts is itself a crossover between Disney and Square-Enix, and the entire premise of the game is that the heroes go from one Disney world to another to help fight off outside interference. How much any given fanfic keeps the worlds separate in this fashion varies, especially if there's more than one world involved.
    • With The World Ends with You characters canonically existing in the KH verse as of 3D and Disney owning both Marvel and the rights to the Star Wars franchise, the possibilities (even without the six degrees principle) are endless.
  • Tales of Vesperia and BlazBlue. At least according to the author of the fanfic. Though it's in the Tales of section rather than the Crossover section.
  • The huge cast in Touhou Project means you can get a bunch of obvious crossovers. Or as some say: "Rule ⑨: If it exists, there is a Touhou version of it". Also, Rule P: If it exists, it has been "ponified" (that is, the characters are drawn as ponies from My Little Pony: Friendship Is Magic). It overlapped with Rule ⑨ once.
  • Sonic the Hedgehog:
    • Klonoa gets crossed over with it quite a lot. This is probably helped by (and possibly due to) the fact that Klonoa looks an awful lot like a Sonic character.
    • With Super Mario Bros.. The fact that it happened in canon probably helps, but people were doing it for years beforehand.
  • Silent Hill is one popular resort town. The second game in particular popularized the idea of the town being a sentient Eldritch Location that lures sinners to their own personalized hell, creating an easy route for crossover plots: have a character (especially a villain or an Anti-Hero) get drawn to Silent Hill and battle monsters that serve as metaphorical representations of all the awful things they did.
  • The entire Japanese Humongous Mecha genre, including every Super Robot and Real Robot show imaginable, largely because of Super Robot Wars being a professional example of this trope and actively using Fix Fic commercially.
  • Devil May Cry:
    • With Bayonetta. It might or might not be canonically in the same world, but as far as fan fiction is concerned, they are. Common elements include Eva, the mother of Dante and Vergil, being an Umbra Witch who had a pact with Sparda (which is hinted at in one of the item descriptions in Bayonetta) and Madama Butterfly being Sparda's sister (probably because they're both unusually powerful insectoid demons). Look for the villains and anti-heroes of every other Action Game the writer likes, but especially God of War and Darksiders.
    • With Resident Evil many times, partly because DMC started as a RE game before Capcom decided that the mechanics were too different and made it an independent series.
  • Crossovers with the Paper Mario series are incredibly common, usually adaptations. Some of the most popular are Edventure of the Thousand Year Door (combining Paper Mario with Ed, Edd n Eddy) and the Paper Mario X series.
  • KanColle:
    • Arpeggio of Blue Steel overlaps with it very well, due to their joint reference pools of World War 2-era Imperial Japanese Navy warships and cute girls.
    • Kancolle and Touken Ranbu are commonly crossed over due to being hosted on the same website and having similar premises. The only difference between the two is that while Kancolle focuses on warship girls, Touken Ranbu focuses on Historical sword boys.
    • Other shipgirl games are ripe for a Kancolle crossover, such as the Chinese franchises Warship Girls and Azur Lane. Even non-anthropomorphic warship games can sometimes be used as crossover fodder, World of Warships in particular.
  • Touken Ranbu itself. Aside from the aforementioned, this game is frequently crossed over with other works set in historical settings in which the historical figures formerly owning the swords show up, such as Sengoku Basara (to the point where it can be safely assumed "Touken Basara" is the most popular type of crossover in the TouRabu fandom ever), Hakuouki or even Gintama. There is also a recurring trend to cross over with Hetalia: Axis Powers and Hozuki's Coolheadedness by placing a character from either series (usually Japan from the former and Hōzuki from the latter) as the saniwa. Crossing over with Onmyōji (2016) is fairly popular among Chinese fans of this game after it introduces its own sword boy Onigiri (voiced by Kosuke Toriumi as the cherry on top).
  • Darkest Dungeon and the Dark Souls-Bloodborne series are all very dark games with strong influence from H.P. Lovecraft, as well as being infamous for their difficulty. There's quite a few fan creation consisting in drawing characters from the FromSoftware franchises in the style of Darkest Dungeon (there's also Darkest Dungeon mods adding characters from those games), as well as gameplay footages from Bloodborne or a Souls game edited with lines of Darkest Dungeon Narrator.
  • Metroid and F-Zero see quite a few crossovers due to the protagonists of both being Bounty Hunters in science fiction settings.
  • BlazBlue and RWBY crossovers are very common due to the unbelievable amount of similarities that both worlds have. A lot more have recently been made thanks to BlazBlue: Cross Tag Battle.
    • Also, RWBY and Bloodborne. Both are stories about Monster Hunters with Mix and Match Weapons, but with wildly different tones. Consequently, stories about one or more characters from Remnant finding their way into Yharnam to get swept up in the Night of the Hunt are not uncommon. Neither are stories about the Good Hunter, after escaping the Dream, waking up on Remnant.
  • Super Smash Bros. is breeding grounds for this, considering that any Nintendo franchise (and whatever else the creators can collaborate with) can be annexed into the Trophy World. Thanks to the World of Light mode in Super Smash Bros. Ultimate and the Spirit system, the possibilities are endless.
  • Ib, Forest of Drizzling Rain, Angels of Death, and Paranormal Syndrome are often crossed over together under the "Free(ware) Horror" fan-banner, as all of them are RPG Maker games that involve some combination of mysterious young girl and plot-important handsome adult man. Yume Nikki, despite not really having an adult man that matches the theme (the closest being how people interpret Seccom Masada-sensei), is included on occasion.
  • Yo-kai Watch with Pokémon because they're similar mon works.
  • Yume Nikki:
    • Off, due to being offbeat RPGs with unsettling content.
    • Undertale, as the protagonists are both Kid Heroes with Eyes Always Shut in strange lands that can use a knife as a weapon. OMORI is occasionally added in, despite its protagonist (initially) not fitting the "closed eyes" theme.

    Visual Novels 
  • Ace Attorney:
    • Both this franchise and Trauma Center are over-the-top DS games about a relatively ordinary profession. Both are 20 Minutes into the Future, and both take place in California (or Japan in the JP versions). Though it's generally agreed they fit well together, crossovers are surprisingly uncommon.
    • Goes well with Elite Beat Agents, probably because both are surprisingly well-Americanized DS games featuring Large Hams with Anime Hair. Heck, one such crossover is even on the Fanfic Recs page! osu!! includes one of such fanfics, to the tune of Queen's Don't Stop Me Now.
    • Unsurprisingly, there's also a fair amount of art crossing it over with Ghost Trick... this is saying something, since Ghost Trick's fandom is comparatively obscure.
    • Danganronpa is a common target because of the franchises' shared focus on over-the-top trials.
  • Any folklore/historical series you can think of has at least one Fate Series crossover, considering the sheer amount of Servants a given character can be paired with.

    Web Comics 
  • You don't have to look far to find Homestuck versions of things; in addition to being very popular, it's easy to whip up a Sburb session for any given fandom, and if you can mimic its distinctive Signature Style then that goes a long way.
  • Girl Genius is crossed over incredibly often with Narbonic, to the point that they’re sometimes not even considered crossovers. This is likely because the spark in Girl Genius is pretty much identical to mad genius in Narbonic.

    Western Animation 
  • For some reason, Transformers tends to get crossed over a lot with WALL•E. Part of it appears to stem from the absurd juxtaposition in settings, no matter which way the crossover goes. Transformers fans can also appreciate small yellow robots, especially when it's one who's well-meaning, hard-working, quirky, kind, and generally innocent while also avoiding a "snarky mascot" or Totally Radical portrayal.
  • The crossover listings for ''G.I. Joe'' have many stories that cross over with X-Men: Evolution. Most of them are written by Red Witch. Most of the others are "set in the Misfit Universe", which means based on Red Witch's on-going series. She has several long stories, and dozens of one-shots which all spring from the premise of G.I. Joe rescuing Toad after Magneto throws him out of a plane after the end of the second season, leading to the entire Brotherhood becoming unofficial wards of G.I. Joe. Insanity ensues, though there's also been quite a bit of drama and tragedy as the series goes on.
  • Danny Phantom gained some popularity in the crossover section with Supernatural. Since both deal with supernatural beings, it was inevitable. Similarly, it's also been crossed over with various fellow animated works featuring supernatural/magical beings, particularly ones which have depicted ghosts of some sort - there have been quite a few crossovers with Gravity Falls, American Dragon: Jake Long, and even Mystery Skulls Animated.
  • The Powerpuff Girls (1998), Dexter's Laboratory, and Samurai Jack happen in the same world, though this might just be a mythology gag by the creators. Almost all of the shows by Cartoon Network prior to Chowder and Flapjack might qualify with FusionFall.
  • Nickelodeon plays with this, having the major shows happen across different universes that seem to intersect.
  • Even before the first season wrapped up, My Little Pony: Friendship Is Magic had already been crossed over a ridiculous amount of times with Doctor Who. Of course, considering its already memetic status and the presence of background pony Doctor Whoof/Whooves, it isn't really that much of a surprise.
    • More strange is the constant crossover fanart with Portal 2, despite only sharing a very minor similarity in the role the moon plays in both series. Wheatley's promise of a pony farm down a pit probably helped too.
    • Crossing Team Fortress 2 with Friendship Is Magic is very popular. Making subtle (and not-so-subtle) pony references is a popular pasttime on the official Team Fortress forums.
      • As well as lambasting the hell out of the person who made the reference.
    • There also appears to be a somewhat baffling overlap with the Halo Fandom which beside Doctor Who seems to be fairly easily the most numerous crossover target in fan fics.
  • Danny Phantom / Teen Titans (2003) crossovers are common amongst the fandom.
  • G1 My Little Pony and G1 Transformers are a common mash-up. This actually has a tiny piece of canon support: in the second TV special, My Little Pony: Escape From Catrina, the cavern where Catrina has set up shop holds several statues resembling Soundwave's minion Ravage. There was a never-animated scene for My Little Pony: The Movie (1986) where Firefly asked Optimus Prime and Shipwreck of G.I. Joe for help.
  • "Mystery Kids" (occasionally known as "Spook Crew") is a Massive Multiplayer Crossover of various Kid Heroes involved in supernatural adventures. This fan film has the cast set as Dipper, Mabel, Coraline, Wybie, Norman, Neil, Raz, and Lili, but it's not uncommon to see Fan Art with Dib and Danny Phantom. Fan works made after 2012 might bring in Wirt and Steven.
  • One newer combination fandom is the "Bad End Friends", which groups together characters that each have a dark and twisted counterpart, in the show or merely in fan works. This includes, but is far from limited to, Bipper, Farmworld Finn, Evil Morty, and an AU version of Wirt who succumbed to the will of the Beast.
  • Hazbin Hotel: Pick a character whose primary trait is killing Demons or otherwise going to Hell. Any character. Somehow, all roads for them will lead to the titular Hotel. Prominent examples include Doomguy, Dante. V1, the Helltaker, and even freakin' Yoshikage Kira.
  • Gravity Falls and Over the Garden Wall have become a popular combination in general; both involve a Sibling Team consisting of a Socially Awkward Hero and a Cloud Cuckoo Lander, with tones that switch from silly to very creepy. It's even common enough that the Crossover Ship of Dipper/Wirt gained quite a bit of traction, and is known as Pinescone.
    • While many crossovers have them meeting at their current ages (often with Mabel and Dipper winding up in the Unknown), another common trope is to have Dipper and Mabel be the future children of either Wirt or Greg. (While GF is definitely in the 2010s, OTGW seems to be set sometime in the near past.) The Sibling Yin-Yang aspect works especially well since Gravity Falls makes Generation Xerox a major theme near the end.
    • To put things in perspective: Archive of Our Own lists the top 10 most popular characters in every fandom, and OTGW's list includes Dipper, Mabel and Bill Cipher.
    • Similarly, it's very common to see Gravity Falls cross over with Rick and Morty due to both shows featuring Justin Roiland, and it only became more popular with the introduction of Stanford Pines and the idea that he crossed paths with Rick Sanchez while lost in the multiverse.
  • Carmen Sandiego:
  • There is a surprisingly large number of fanarts crossing Winnie the Pooh and Calvin and Hobbes. And with Pooh in general, as Pooh's Adventures proves.
  • Thomas & Friends and Tugs tend to cross over a lot, due to having similar subject matter (anthropomorphic vehicles), a similarly realistic setting (apart from the anthropomorphic vehicles) and the same creative team. From Series 3 of Thomas onwards, there was even an element of canon support to this, as models from Tugs were used in Thomas.
  • Winx Club:
  • G.I. Joe: A Real American Hero and Jem crossovers are commonplace because of implications that they take place in a Shared Universe. The implications of Synergy's technology in relationship to GI Joe make for prime plot material.
  • Total Drama: At the height of the Twilight craze, Whole-Plot Reference fics were incredibly common. Usually Duncan and Courtney were "cast" as Edward and Bella, though it changed when Duncan/Gwen became the Fan-Preferred Couple.
  • Amphibia and The Owl House are extremely common to make crossovers between. The reason is simple: They are very similar shows created by former crew members of Gravity Falls released a year apart with very Friendly Fandoms. It's to the point that it's almost Fanon that they are set in the same multiverse. Supporting this, a scene in The Owl House briefly shows Anne, the protagonist of the former show, in a news page as a missing girl, indicating the two may be actually taking place in a shared universe. Eventually, the two shows made an unofficial crossover as a script-reading at San Diego Comic Con 2021, and later a Chibi Tiny Tales short.