%% Image selected per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1350073032009000100
%% Please do not change or remove without starting a new thread.
%% ATTENTION EDITORS: Please fix examples you feel are incorrect, rather than adding a counterpoint.
%% Read the articles on Conversation In The Main Page, Repair Don't Respond, and This Troper for reasons as to why.
[[quoteright:226: http://static.tvtropes.org/pmwiki/pub/images/duckbeaver_8345.png]]
[[caption-width-right:226:[[JustSoStory And that's how the platypus came to be!]]\\
[-Image by [[http://pandaluna.com/ Pandaluna]]-]]]

->''"Fuuu... sion!! Ha!!"''
-->-- ''Anime/DragonBallZ''

Two separate characters merge to make one, usually more powerful, unified being. This is done either via AppliedPhlebotinum, FunctionalMagic and/or MergingMachine. This can have a number of unpredictable results:

* '''The Composite''' -- '''A''' and '''B''' merge; the end result '''C''' has aspects of ''both'' the characters that were part of the merge, including AllYourPowersCombined and a [[MentalFusion fused personality]]. May also be a CombiningMecha or a [[MixAndMatchCritters Mix-and-Match Critter]]. For example, two fused fighters in ''Anime/DragonBallZ''.
* '''Power Booster''' -- Person '''B''' disappears, but the merging [[SuperEmpowering gives powers or attributes to]] '''A''' s/he didn't have before. '''B''' may be able to speak to '''A''' in his or her mind. '''A''' still looks exactly the same as before, only has superficial changes (clothing, for example), or looks like a more powered-up version of '''A''' (and only of '''A'''). For example, Himeno and a Leafe Knight in ''Manga/{{Pretear}}''.
* '''Switcher''' -- '''A''' and '''B''' merge; they both keep their traits, but only one of them can be present at a time and they can now switch places as needed. If '''B''' is the powerful one but '''A''' lives the everyday life, then '''B''' will act as a SuperpoweredAlterEgo. May result in '''A''' or '''B''' occasionally controlling the other's body. For example, ''Anime/BirdyTheMighty'' or Yugi Mutou and Yami Yugi from ''Anime/YuGiOh.'' [[note]]Though this one is debatable, since Yami Yugi looks exactly like an older version of Yugi (i.e. what he will be in 5-10 years).[[/note]]
* '''TwoBeingsOneBody''' -- '''A''' and '''B''' merge physically, but both personalities retain some control over the body. If full control is not possible on either side, they will need to cooperate to do so much as move. Even if that problem does not exist, the personalities might end up fighting for control if they do not agree on something they want. See also EvilHand.
* '''Mixed Form Shapeshifter''' -- '''A''' and '''B''' merge, and instead of choosing between two forms, [[VoluntaryShapeshifting they can combine them as they need]], and [[PartialTransformation can make a form]] with [[MultiformBalance the advantages of both forms]]. For example, Fusion Evolve from ''Anime/DigimonFrontier''.

In most cases, this is to make a being more ''powerful'' than either would be alone (especially when it involves TheHero and TheRival since that invokes YinYangBomb), but there are some exceptions.

Contrast LiteralSplitPersonality and SelfDuplication, when an individual gets split into two or more beings. Contrast also GrandTheftMe, which looks like the Power Booster or Switcher variant but with less cooperation and more hostility. Compare CombiningMecha. Not to be confused with CompositeCharacter. See also AllYourPowersCombined, MotifMerger and EquippableAlly (for a less intrusive method of combining two characters). This trope may sound like a literal version of MatingDance, but it's not. When the fusion [[GoneHorriblyWrong goes horribly wrong]], see MergingMistake. If the components have a romantic relationship, also see RomanticFusion.


[[folder: Advertisement]]
* During the commercial Choques for axe/Lynx, we can see a big number of fusions occuring while a man drives though the city. The females merge with the objective of creating a better woman for the man watch it here ( https://www.youtube.com/watch?v=Kkn2onAVXYg )
[[folder: Anime and Manga]]
* ''Anime/DragonBallZ'' provides the TropeNamer and many examples of character fusions. In several cases, fused characters even speak with both voices of their individual parts in unison. The series has several kinds of fusions:
** The {{Trope Nam|er}}ing move itself is a Composite type (which requires two warriors of similar strength and size to perform), and it's also temporary, lasting 30 minutes normally. Three examples were shown: Goten and Trunks becoming Gotenks, Goku and Vegeta becoming Gogeta in the movie "Fusion Reborn", and Goku and Vegeta becoming Gogeta as Super Saiyan 4 in ''Anime/DragonBallGT''.
** The fusions created from Potara Earrings are, unlike the Fusion Dance, permanent and do not require fusees of similar strength and size. Because of that, while they ''can'' produce Composite fusions (like Vegito), one of the component characters can have a dominant presence in the fused character instead--making the fusion more of a Power Booster. (For example, [[spoiler:the Elder Kaioshin and Kibito-Shin]]--their [[spoiler:Kai]] halves are so dominant that they're practically the [[spoiler:Kaioshin]] with the addition of memories, powers, and (a few) physical traits from their other halves). The permanent aspect of the Potara earrings is briefly and hilariously [[DeconstructedTrope deconstructed]] after a what-if battle in ''Raging Blast''. [[spoiler:What exactly ''is'' Vegito going to tell his two halves' wives?]] ''Anime/DragonBallSuper'' {{Revision}}s this, amending the permanent aspect of it to be limited to the Kais. On mortals, it lasts an hour under normal conditions.
** The Namekians have their own form of fusion which is mostly a Power Booster; one Namekian will fuse his body with another, boosting the other Namekian's power level and giving them access to their memories and abilities, but doing relatively little to alter their personality or appearance.
** Cell can absorb people by basically sucking up their entire body as one would suck liquid through a straw, but he can, was designed to, and does absorb Androids 17 and 18. They act as a Power Booster as they change Cell's appearance, but not to mimic their own; he can, however, briefly manifest their voice or powers if the need arises.
*** Cell, as a biological creature, also counts as a Composite fusion of numerous characters already seen; he uses the signature attacks and shares the biological makeup of the series' strongest fighters, including [[EvilOverlord Freiza]] and [[SpiritedCompetitor Goku.]] This allows him to [[FromASingleCell survive impossibly deadly attacks,]] while [[CameBackStrong inheriting the Saiyan's racial ability to increase in strength after a near-death experience.]]
** Buu absorbs a victim, gaining some of their physical traits, and having a personality change to lean towards the absorbee, also gaining knowledge and power. However, for Buu, this works both ways: Whilst absorbing Ultimate Gohan gave him a huge boost in power, absorbing a fat elder Kai not only added a fun-loving, playful shade to his personality, but also weakened him considerably. Once this aspect is removed, Buu is stated to be physically weaker, but [[ApocalypseHow vastly more dangerous]] without [[RestrainingBolt the Kai's peaceful influence.]] That Buu had already killed and/or [[BalefulPolymorph eaten]] the entire population of the world up to that point speaks volumes to his violent tendencies.
*** In ''Budokai 2'', they expand on this. Buu can also absorb Vegeta, Cell, Frieza, and Yamcha/Tien. The Yamcha/Tien absorption weakens him, but in return, [[WeakButSkilled he gains access to more attacks than his other absorptions give him]].
** While not canon, Goku and ''[[FakeUltimateHero Hercule]]'' can fuse with Potara earrings to become Gokule and Tien and Yamcha can perform the Fusion Dance to become Tiencha in some games starting with the second Budokai game.
** In one WhatIf nightmare, Cell absorbs Krillin instead of 18. Picture an orange Cell Jr. with Krillin's face.
** In ''Anime/DragonBallGT'', Android 17 is brainwashed into fusing with a duplicate Android 17 made by Dr. Gero and Dr. Myuu.
** The 3DS game ''VideoGame/DragonBallFusions'' takes this a step further, with Capsule Corporation inventing a new method of fusion through a device called the Metamo-Ring. Appropriately enough, Bulma outright describes this method as a fusion of the two other methods: it mostly functions like Potara fusion, but it requires the Fusion Dance and lasts until the fused being removes the ring. It's also [[SerialEscalation taken a step further]], with the [[QuirkyMinibossSquad Ginyu Force]] inventing a '''five-person''' version of the Fusion Dance that produces a single being who's so insanely powerful that it only lasts for about ten seconds.
** In ''Anime/DragonBallSuper'', [[BigBadDuumvirate Goku Black and Future Zamasu]] fuse together using the Potara earrings to become Fusion Zamasu. To counter the might of Fusion Zamasu, Goku and Vegeta eventually decides to fuse together with the Potara Earrings, recreating Vegito. Thanks to the above-mentioned {{Revision}}, their fusion is short-lived. The fusion of Goku Black and Future Zamasu is permanent, since Future Zamasu is a Kai [[spoiler:but since Zamasu was immortal and Goku Black wasn't the fusion is unstable and they end up becoming a hideous monster. Averted in the manga however, where Zamasu keeps his immortality and combines Black's power with Zamasu's magical abilities, conjuring portals and blocks of Katchin, but the fusion becomes temporary like that of Vegito's due to Future Zamasu never officially becoming a Supreme Kai]].
--> "I can feel it... two powers merging together into this body. Observe! A body that can infinitely increase in strenght and is inmortal! It feels good, this power that fills my body... this is true justice!"
** [[spoiler: The Namekian participants from U6, Saonel and Pirina, have been shown to fuse with ''hundreds of other Namekian'' from their planet to give them an edge over the rest of the participants, and indeed it allows them to go toe-to-toe with Ultimate Gohan and Piccolo Sadly, they are ringed out anyways, and the universe gets erased shortly after... until the end anyway.]]
* As noted above ''Anime/YuGiOh'' features a Switcher, but with a twist (Yami Yugi is ''dead'' and doesn't have his own body to return to, instead being stored in the Millennium Puzzle). A number of other characters can do this; most Millennium Items also seem to have the ability to split/merge souls in one body, though without physical power-up (unless you count [[SeriousBusiness increased card game prowess]]. [[WindsOfDestinyChange And you should]]).
** In ''Anime/YuGiOhCapsuleMonsters'', Yami can fuse with certain monsters such as the Dark Magician. Joey also fuses with the Red-Eyes Black Dragon at one point.
** ''Anime/YuGiOh'' also subverts this (in that Malik's eye stays with him) when he merges with his Egyptian god card.
** In the card game itself, there is a card called Fusion (Polymerization in the English version) that lets you fuse two or more monsters into one big one. Sometimes they share attributes of both (Black Skull Dragon), other times it's a literal cramming together of multiple monsters into one body (Blue Eyes Ultimate Dragon) and sometimes it's something so random one can only wonder why they made it a fusion monster (Metal Dragon). Fusing a mounted warrior with a monster usually just resulted in the warrior switching mounts (Gaia the Dragon Champion).
** Also in Dawn of the Duel, Priest Karim does just this using the Millennium Scales to fuse his and Priest Seto's Ka Spirits together, literally calling it "Ka Fusion".
* The Elemental/Evil Hero Fusions used in ''Anime/YuGiOhGX'' work as the first two types, combining into a hodgepodge Hero of its components with beefed up versions of their abilities. The Neos fusions fit into this trope better, though, as for the most part, they rely on the materials' innate "Contact Fusion" power to form, instead of an outside Fusion spell like the others.
** Juudai and Yubel's fusion are of the Power Booster variety; Yubel can still speak to Juudai in his mind (and appear as a spirit), and he can use her powers and when he does so, his eyes change colors to be just like hers.
* Yuma and Astral in ''Anime/YuGiOhZEXAL'' have learned to fuse. It's a power booster: Astral disappears and Yuma's hair turns gold ([[http://img855.imageshack.us/img855/8537/superyuuma1.jpg seen here]]), but unlike Juudai and Yubel, they can also de-fuse.
* The ''Franchise/{{Digimon}}'' [[TheVerse verse]] has examples of both the first and second types:
** ''Anime/DigimonAdventure'' has War Greymon and Metal Garurumon fuse into Omegamon (aka Omnimon) in TheMovie. Omegamon not only looks like both of them, but speaks with the voices of both at once. Composite.
** The [[Anime/DigimonAdventure02 sequel]] Manga/DigimonVTamer01 brings a series of similar fusions. Unlike with Omnimon above, these evolutions aren't of the Composite-type; the[[AllThereInTheManual spin-off fiction]] insteads presents them to be a variant of the Power Booster type in that the secondary fusee serves as an optional support for the primary fusee to evolve. [[note]]The Ryo games specifically demonstrate this via firstly the 02 Jogress Perfects being accessible both with Stingmon / Angemon / Gatomon and without those three, and secondly via MagnaAngemon being the result of leading with Angemon and then using Ankylomon as the possible support.[[/note]]
** ''Manga/DigimonVTamer01'' eventually has Neo use [[MerchandiseDriven the very jogress sequence owners of the v-pets needed to use]] to get a "Mega Level" monster. However, Neo ends up with a monster [[CanonForeigner no one could actually get]] ([[{{Defictionalization}} yet]]) because he's just that good.
** In ''Anime/DigimonTamers'', Bio-Merge Digivolutions are when a human and their Digimon partner evolve together, into the Digimon's Mega Level. This is functionally identical to the DNA mechanic presented above, only with the evolution-support being the Tamer, and as such, a Power Booster type.
** ''Anime/DigimonFrontier'': Susanoomon is the result of combining all ten Spirit pairs into one mon. A Composite of [[PlayingWithFire EmperorGreymon]] and [[LightEmUp MagnaGarurumon]]. On a lesser scale, the Fusion Evolutions are the result of melding the Human and Beast forms of each elemental spirit to create a new form combining traits of both (e.g. a character who could transform into a dragon or an armoured warrior could become a humanoid dragon wearing armor). While Takuya and Koji are the only ones ever shown doing it in the anime, Human-Beast fusions for the other warriors has been released in the card game and in some cases featured the episodes of other digimon seasons (Daipenmon being in Xros Wars).
** ''Anime/DigimonXrosWars,'' aka Digimon Fusion, draws from multiple categories. The human characters with "Xros Loader" devices can temporarily fuse together Digimon into new forms: some are in the "composite" category, while others become inanimate weapons to be wielded by the remaining characters. Some opponents are shown to [[DevourTheDragon absorb their subordinates]], falling under "biological mash-up" (minus the blending personalities). Also, there are instances of Digimon who have been blasted into particles of data - just how dead this makes a 'mon varies between the different series in the franchise - having these particles absorbed to empower the leader. Unlike seasons past, this causes the absorber to take on physical aspects of the absorb-ee. As for personality, most of the Shoutmon combinations are simply Shoutmon using the others to power up; Shoutmon's voice alone is heard, personality unchanged from when not fused. However, sometimes we do hear the others speak. Basically, there's a "core" of a fusion and the others ''typically'' leave the driving to him but can copilot as desired.
* ''Anime/GaoGaiGar'' is a Mecha show, and thus has a bunch of CombiningMecha examples; but the qualifiers for the Fusion Dance trope are the 31 Primevals ([[NinjaPirateZombieRobot alien robot zombies themed after various body parts]]), who can use a Composite example called "Primeval Fusion" to combine with each other. Since they can also assimilate pretty much any organic or inorganic matter, this results in some truly bizarre mash-up monsters, like [[WeaponizedLandmark one of the Pyramids of Giza with a giant arm coming out of the top, with the head of the Sphinx forming one of its fingers]]. Seriously, that's one of the MonstersOfTheWeek. [[spoiler: They can also combine into a single being, the Z-Master, which is about the same size as a freakin' planet. And by "planet", we mean ''Jupiter''.]]
* ''Manga/FullmetalAlchemist'' also provides a number of examples:
** Chimeras are the result of alchemical fusion of two beings. ''Human'' chimeras tend to be a Mixed Form Shapeshifter--if done correctly. Failed Human chimeras result in a Composite-like fusion with the human half's soul and memories in control, but [[BodyHorror very much in pain]]. Successful ones retain their human forms, but can transform into a HalfHumanHybrid or gain powers reminiscent of the animals fused into them.
** The Power Booster and Switcher varieties also comes courtesy of the Homunculi. It appears to be a common hubris for them: they think of things they've eaten as food, but their "food" often retains an independent will.
*** [[spoiler:Ling and Greed]] are somewhere between Power Booster and Switcher. [[spoiler:The outer appearance is always Ling's, but they can switch off who's in control. When Greed is in control, he has his powers. When Ling is in control, he has his martial arts skill and ''ability to sense other Homunculi''.]]
*** After [[spoiler:Pride]] was almost defeated, he ate [[spoiler:Gluttony]] and gained powers ([[spoiler:acute sense of smell]]), but remained in control. He later ate [[spoiler:Kimblee]], but this backfired because [[spoiler:Kimblee]] managed to remain a distinct personality--because [[spoiler:[[InsanityImmunity the screams of tormented souls are like a lullaby to him]]]].
*** Late in the series, [[spoiler:Father]] tried to absorb [[spoiler:God]] to get his powers and knowledge, and then tried to absorb [[spoiler:Greed]] to get his philosopher's stone. Both backfired in quick succession: [[spoiler:Greed transmuted Father's body into charcoal, cue beatdown from Ed, and Father no longer had the strength to suppress God]].
* Mixi-Max in ''[[VideoGame/InazumaEleven Inazuma Eleven GO: Chrono Stone]]'' allows people to take another person's aura, and combines it with their own aura. By the time Raimon [[spoiler: gets their hands on the Hasha no Seiten]], the whole premise revolves around finding out who's going to Mixi-Max with who to create the Ultimate Eleven.
* ''Manga/{{Naruto}}''
** BeastMan [[HotBlooded Kiba]], who can merge with his [[PreciousPuppies dog Akamaru]] into a [[CanisMajor massive two-headed wolf]]. The body counts as a third form over which both participants have control, but the two of them are typically so in sync that there is no squabbling about a course of action. They just kick ass.
** [[spoiler:White Zetsu clones]] have shown the ability to merge into a bizarre [[LordOfTheRings Ent]]-like giant.
** There's also [[spoiler:[[DragonAscendant Kabuto]]]], who integrated [[spoiler:his former boss Orochimaru]]'s body into his own to gain vastly increased power and special abilities.
** Flashbacks show [[spoiler:BigBad Tobi]] utilizing [[spoiler:Spiral Zetsu]] as a living exoskeleton.
** Kisame can fuse with his ''sword''.
* The Guardians also pull it off in the ''VideoGame/MegaManZero'' manga, becoming that series' "Copy X". Interestingly enough, they beat Rockman Zero, but they lose to the cowardly Zero. That's embarrassing.
* The Power Booster variant turns out to have taken place in ''Anime/DarkerThanBlack'' with [[spoiler:Hei, who turns out to be human with his dead sister's Contractor powers]]. She somehow lives on inside him.
* Unison Devices in ''Franchise/LyricalNanoha'' are, ostensibly, Power Boosters. A form of LivingWeapon designed by the ancient Belkans, they take the "living" aspect to a greater extent than Mid-Childa's [[EmpathicWeapon Intelligent Devices]]. These "sentient magical programs" (powerful offensive mages in their own right) can unison with a mage (or knight, as Belkans called them) to boost their abilities. Usually this comes with some form of change in the color of one's hair, eyes, or even clothes and armor ...
** ... ''However'', Unison Devices can also act as a Switcher. As weapons with egos, they can overwhelm their users, practically absorbing them; this is known as a "Unison Accident," where the subsumed user's body transforms into the Unison Device's own, and the Unison Device is the dominant personality.
*** In ''[[VideoGame/MagicalGirlLyricalNanohaAsPortable Magical Girl Lyrical Nanoha A's Portable: The Battle of Aces]]'', Hayate and her incredibly powerful Unison Device Reinforce can do this ''intentionally'', becoming the [[GameBreaker absurdly powerful]] [[PurposelyOverpowered Unison Reinforce]].
* ''Manga/ShugoChara'''s Character Transformation system works as a Power Booster. Amu wears the clothes of the respective Chara inside her, and gains a bit of extra power and agility with it.
** The lesser version of this, the Chara Change, results in a change in hairpin and a violent personality shift as Amu's Chara ''possesses'' her, often without thinking to seek her consent, good intentions or not.
* ''Anime/Figure17TsubasaAndHikaru'' features a sentient alloy that "fuses" with other people (the result is a somewhat androgynous alien being with superpowers). The main character, Tsubasa, ends up with one "leaking" from its protective container all over her and fuses with it; afterwards, the alloy takes its own form as Tsubasa's "twin" Hikaru, since it has no container to return to.
* ''LightNovel/ScrappedPrincess'' uses a mix of the Power Booster and Composite variety. When Shannon (a regular knight) and Zefiris (a dragoon) fuse together, her human-like body disappears, but Shannon is covered by her dragoon form, which in its incomplete form just looks like some sort of fearsome aura, making it look like his powers are just boosted.
* Chizuru and Kouta can do a Power Booster-style fusion in ''LightNovel/{{Kanokon}}''. This kind of uniting can only be done if the kitsune and the partner are willing--and Kouta is. The most noticeable differences to Kouta are [[PettingZooPeople ears, whiskers, a tail]] and the ability to launch fireballs.
* Out of the blue the finale of ''Anime/JubeiChan'' has [[spoiler: Jiyu and Freesia]] inexplicably joining together and then proceeding to kick ass.
* In ''Manga/UFOPrincessValkyrie 2'', Akidra is born of a Composite fusion... with a twist. [[spoiler:When Akina and Hydra's friendship is ruined, and they despise each other, it becomes possible for them to fuse to form Akidra, who has the sum power of them both and all of their abilities. Their personalities remain separate, and they can converse and argue. If they come to like each other too much, the fusion separates again.]]
* In ''Manga/{{Berserk}}'', Schierke has merged astrally with Guts several times, but not to power him up--she did it to prevent him from killing the rest of his TrueCompanions because of the cursed Berserker Armor acting as a powerful conduit for his EnemyWithin.
* About the GenderBender-ness above mentioned, in ''Anime/MazeMegaburstSpace'' is a switcher-class fusion of [[HandsomeLech Otoko-Maze]] ([[spoiler:Akira]]) and [[TheUnwantedHarem Onna-Maze]] ([[spoiler:Mei]])
** Also has elements of a Composite type since when temporarily separated it become clear that its not a one-to-one correspondence and Onna-Maze has picked up some of ([[spoiler:Akira's]]) and Otoko-Maze has picked up some of ([[spoiler:Mei's]]).
* The abovementioned "Power Booster"-type transformations in ''Manga/{{Pretear}}'' allow Himeno to choose between seven available [[MagicalGirl forms]] and [[ElementalPowers powers]] by choosing a Knight to merge with, but result either in her draining the Knight's [[LifeEnergy "Leafe"]] in order to perform attacks (manga), or in the Knight receiving injuries from battles instead of her (anime). Additionally, in the anime version the transformations are specifically said to be the result of joining ''spirits'', not bodies--which seems to make it impossible for the Pretear to merge with a Knight against her will, even if she is just in doubt.
* In ''Manga/DGrayMan'', twin brothers Jasdero and Devit shoot each other in the head to merge into one single entity... Jasdevi. However, it has been hinted that Jasdevi might have split into the twins ... but the twins are always seen as separate entities in both the manga and anime.
* ''Manga/BoboboboBobobo'' parodies [=DBZ=]'s Fusion Dance with several of its own bizarre fusions, including [=BoboPatch=] (Bobobo + Don Patchi), [=BoboPatchnosuke=] (Bobobo + Don Patchi + Tokoro Tennosuke), and Denbo-chan (Bobobo + Dengaku Man).
** [=PatchBobo=], (Don Patch + Bo-Bobo) when Don Patch switched his name to top billing. (This would arguably be a type D fusion. The fusions have nothing to do with whomever fused to become them.)
* Also mentioned in the examples, ''Anime/BirdyTheMighty''. [[SpacePolice Interstellar Police Officer]] Birdy accidentally injures [[OrdinaryHighSchoolStudent Tsutomu]] in pursuit of suspects who fled to Earth. As punishment for being so reckless (or trying to cover it up in the remake manga) she is forced to allow Tsutomu's consciousness to share her body while his is fixed. She can shapeshift into Tsutomu's form so he can continue his everyday life but--at least in the TV series--she appears to maintain ultimate control over their shared body.
* Early on in ''Manga/ShamanKing'', the shamans tended to use their own bodies as vessels for their spirit partners. Later, they learned to use inanimate objects instead for greater effectiveness.
* In ''Manga/{{Bleach}}'', [[spoiler: Stark and his fraccion Lilinette need to merge into a single being in order to use their full powers. This is revealed to be because they were actually a single Hollow to begin with that split into two when they became Arrancar.]]
** [[spoiler:It's revealed that Lilinette is actually his left pistol, which retains her personality and can even talk. Less useful than it sounds. There's an implication that she has limited control over where and how much Stark is shooting.]]
*** [[spoiler: Stark]] can further release his power, abandoning guns in favor of a bunch of spirit-wolves. Note that there is a divergence in the anime and manga. In the manga, the 2 are just further fused into a single personality, which even identifies as "We." In the anime, [[spoiler: Lilynette is the wolves, and if they're destroyed without biting something, she's gone forever. No, it does not make sense in context.]]
** Part of Ichigo's [[spoiler:Final Getsuga]] technique involves [[spoiler: fusing with Zangetsu]].
* Parodied in ''Manga/SgtFrog''--Momoka's split personality is manifest as a second Momoka, and the only way to rectify this is through a literal Fusion Dance, where mastering synchronized swimming will cause them to synchronize physically and meld back into one. Unfortunately, Keroro and Giroro, by way of imparting this to Momoka, get themselves fused together by complete accident.
** More recently, Keroro fused with each member of the platoon one by one in an attempt to boost their powers to invade earth, but turns out to be helpful instead of harmful. [[spoiler: Then all five of them fuse together and end up slipping on a banana peel.]]
* Cross Fusion in ''Anime/MegaManNTWarrior'' essentially results in Lan in a Mega Man suit. Mega can communicate with Lan (and they have to be in sync with each other or the fusion falls apart), but otherwise Lan is the one in control. (The same goes for most other Cross Fusion cases, unless the human has a very different body type than the Net Navi. The human's body type wins.) Power Booster disguised as Composite.
** There was also Soul Unison (at least that's what it's called in the original ''Anime/RockmanEXEAccess'', don't know if the dub changed its name). Serving as a Power Boost that incorporated aspects of Composite for Rockman. He would take on looks of an ally and gain access to their signature ability, but there was no merging of personalities. After the 1st use of a soul Netto would gain a new Battle Chip allowing it to be used freely.
* ''Manga/OnePiece'':
** Villain and BigEater King Wapol has the ability to [[ExtremeOmnivore eat anything]] ([[ImAHumanitarian or anyone]]) and fuse them with himself or together, such as the Composite Chessmarimo.
** Later during the Dressoria arc, Kelly Funk, a competitor of the coliseum has a Devil Fruit called the Jacket Jacket Fruit that allows him to be worn over his larger and more timid brother [[ExactlyWhatItSaysOnTheTin to be worn over like a zipped up jacket]] of his skin in order to take advantage of the latter's strength.
* ''Anime/{{Shinzo}}'': The majority of characters in the show are Enterrans. Enterrans have the ability to transform to become stronger and they turn into "En Cards" when they die. When an Enterran eats an En Card, or absorbs one through the chest, they transform into a composite of them self and the Enterran the card they ate/absorbed came from. The protagonist Mushra does this with the other two male heroes, Saago and Kutall, to become Mushrambo. [[spoiler:Subverted later on when it's revealed that they're actually the three split components of the Anterran leader General Mushrambo, who originally orchestrated the genocide of the human race.]]
* The ending of ''Anime/RebuildOfEvangelion 2.0'': Unit 01 [[spoiler:melts Zeruel into a cloud of LCL which then [[{{Fanservice}} reforms into a giant Rei]], which in turn merges with Unit 01 to become a god... and starts the [[TheEndOfTheWorldAsWeKnowIt Third Impact]]]].
** [[spoiler:Zeruel himself just ate Unit 00 and Rei and became a giant, glowing, naked, sexy young girl with the Angel Of Toilet Paper And Explosions on her head and a core between her {{Gainaxing}} breasts.]]
* Episode 21 of the ''Manga/SoulEater'' anime: Blair is fighting the (remaining) 5 Mizune sisters. She [[CurbStompBattle smashes four of the sisters]] with one spell...but the fifth sister behind her starts [[GigglingVillain giggling madly.]] Activating the hivemind within the sisters (accompanied by speaking in sync and rhythmic finger-snapping), Create a TotemPoleTrench the five combine to form... a HotWitch.
** Though the 5-Mizune witch has yet to do anything but provide FanService, in the manga two or three Mizune can combine together to form a teenage-looking girl (the one made from three looks a bit older) actually capable of fighting.
* In ''Manga/NurarihyonNoMago'', Rihan's and Rikuo's ability as a half-youkai, Matoi, [[spoiler:allows them to "wear" the "fear" of their subordinates to increase their individual power, also gaining some of said subordinate's techniques]].
* In ''CinderellaBoy'', Ranma ([[Manga/RanmaOneHalf no.]]) and Rella are [[WeCanRebuildHim rebuilt]] into the same body after a fatal accident by a MadScientist. Every 24 hours, they switch places. The scientist developed the system as a way to reduce overpopulation: Multiple people in the same body take up less space, after all.
* In ''Manga/{{Claymore}}'', [[TheAtoner Raphaela]] has vowed to [[KillTheOnesYouLove kill]] her [[TragicMonster sister.]] However, since she loves her, she ends up unintentionally pouring her life energy into her in the same instant. The end result looks somewhat like ConjoinedTwins and is initially completely unresponsive like a statue - until [[NiceJobBreakingItHero someone wakes it up,]] giving birth to [[EldritchAbomination the Destroyer.]]
* ''Anime/BlackRockShooter'' has the Power Booster variant - the titular character gains access to her [[ArmCannon arm]] [[{{BFG}} cannon]] when she merges with [[spoiler:Mato]]. Her appearance is unchanged, though [[spoiler:the two were already similar in appearance]].
* ''PlusterWorld'' is a {{Mon}} anime where the mons transform by fusing with humans.
* In ''Manga/{{Beelzebub}}'' [[spoiler:Oga and Be'el]] can fuse through [[spoiler:Super milk time.]]
* ''Anime/PuellaMagiMadokaMagica'' has a villainous example: [[spoiler:Walpurgisnight, the most powerful witch (aside from Madoka's witch form), is a conglomerate of many witches fused together.]]
** A power exchange happens in the end to [[spoiler:Homura and Madoka. Madoka, thanks to Homura's time-traveling, becomes a history-rewriting force of nature, but ceases to exist as a physical person. Homura loses her time powers, but gains a magic bow, Madoka's WeaponOfChoice in her earlier incarnations]].
* A mostly forgotten example in one of the early episodes of the ''Anime/{{Pokemon}}'' is the Pokémon Gastly that uses illusions to attack... and in doing so combines the (illusory) Pokémon Venusaur and Blastoise into what it terms a "Super Pokemon" - Venustoise. This has never been referenced again and such a fusion isn't seen again until Black 2 and White 2.
* Happens fairly often in the ''Anime/PrettyCure franchise''.
** In ''Anime/FutariWaPrettyCure'', TheBrute Gekidrago can fuses with [[MonstersOfTheWeek Zakennas]]. [[spoiler:TheDragon Illkubo, too. And the [[TerribleTrio Seeds of Darkness]] fuse together and they become the Giant.]]
** In ''Anime/FutariWaPrettyCure'', both, Karehaan and Dorodoron fuse with [[MonstersOfTheWeek Uzainas]], respectively, in their final battles. [[spoiler:Only during their first final battles.]]
** In ''Anime/YesPrettyCure5GoGo'', Yadokhan and Isohgin always fuse together into their OneWingedAngel form.
** In ''Anime/FreshPrettyCure'', [[spoiler:The CoDragons Northa and Klein fuse together and become an actual dragon person.]]
** In ''Anime/HeartcatchPrettyCure'''s GrandFinale, [[spoiler:all four Pretty Cure and their three mascots use the power of the Heartcatch Mirage to become Mugen Silhouette, a planet-sized Pretty Cure.]]
*** Also, the villains can fuse with the [[MonstersOfTheWeek Desertrians]] by using the Dark Bracelets, but unlike the ''Anime/FutariWaPrettyCure'' villains above, the monsters become stronger, not the villains.
** In ''Anime/SuitePrettyCure'', [[spoiler:TheBigBad Noise absorbs the [[TerribleTrio Trio the Minor]] and gets a humanoid body]]. And later, [[spoiler:the eight Fairy Tones fuse together and become a second Crescendo Tone.]]
** In ''Anime/SmilePrettyCure'', the villains can fuse with the [[MonstersOfTheWeek Akanbes]] by using the black noses, like the Dark Bracelet example above. And [[spoiler:TheDragon Joker liquefies himself and becomes a part of TheBigBad Pierrot.]]
** In ''Anime/DokiDokiPrettyCure'', the villains can fuse with the [[MonstersOfTheWeek Jikochuus]] by devouring the dark Psyches. And later, [[spoiler:Leva and Gula fuse together and become a Jikochuu themselves]].
* The basic premise of ''{{Transformers}}: Kiss Players'' is that certain girls can, after kissing a Transformer, phase into the robot's body, granting it a tremendous power boost and granting it her knowledge (for example, Shaoshao Li could grant Hot Rod her martial arts skills). When they separate, the girl [[TheNudifier will be naked]] and covered with some [[{{Squick}} unidentified white fluid]]. This fusion has a time limit, after which the Transformer will involuntarily eject the girl.
* In ''Anime/VividredOperation'', one of the flagship features of the Vivid System is gifting the protagonist, Akane Isshiki, with the ability to fuse with other users of the system. The fusion is of the Power Boosting type, with Akane disappearing and the other users turning into an OlderAlterEgo with increased powers. Strangely, Akane seems to be the leading personality in the new body, rather than any of the other girls.
* A special one shot called "Boy Girl Fusion" [[ExactlyWhatItSaysOnTheTin is where a boy and a girl merge together to fight evil]] [[GenderBender It does turn the male into a hot chick though]].
* In the manga, ''Manga/BinbogamiGa'', [[spoiler: Momiji does this with With Ichiko Sakura in chapter 27 to keep Yamabuki from extracting her own fortune. It basically cancels out both of their powers to zero, after which they split the power they have with Yamabuki equally, putting them on the same level. And then they apologize for being jerks in the first place, leading to a slight subversion to the [[CurbStompBattle usual result.]]]]
* In ''Anime/SailorMoon'', the two [[BigBad Big Bads]] of the season, Queen Beryl and Queen Metallia, do this to become a giant Beryl during the final battle, [[spoiler: and thus are simultaneously eliminated by Princess Serenity at the fight's end]].
* The anime of ''Manga/ArpeggioOfBlueSteel'' has several different types of fusions:
** Haruna and Kirishima fuse into one huge ship to combine their powers in order to defeat the heroes. The result is that [[spoiler:the two fog ships present a single target for the heroes to defeat in one decisive shot]]. This one also happens in the manga.
** Takao merges with the I-401 to [[spoiler:save Gunzou and Iona, as they had been sunk by her sisters]]. The result is the submarine cruiser Ars Nova. The ship still has the designation I-401, and Iona is mainly in control, but Takao can still control anything. They have no problems cooperating, though, and they even have more Fog ships on board who can help with various processing tasks as well.
** Kongou forcefully merges with Maya and ''eight'' Nagara-class cruisers into some kind of super zeppelin, which gives her enough firepower to obliterate entire fleets. However, Maya never had a true core, so she didn't have a real personality for Kongou to take over.
* In ''Animation/GuardianFairyMichel'', by fusing with the fairies, Michel gains their powers and then some, showing exactly why he's the guardian. Regular fairies Biam and Polly accidentally fuse once, creating a forest dragon.
* In Part 8 of ''JoJosBizarreAdventure'', ''[=JoJolion=]'', mysterious land formations called Wall Eyes have the power to mix and recombine anything that's buried in them. [[spoiler:The protagonist, Josuke Higashikata, is the product of this happening to two ''people'' -- Yoshikage Kira and Josefumi Kujo.]]
* In ''VisualNovels/{{Slayers}}'', this is the ultimate power of the little-detailed "Chimera magic" branch of sorcery. Skilled wizards can fuse living creatures together to create superior organisms, although it's seen as a very disreputable branch of magic. Protagonist Zelgadis is an example of how well this can work out; his VillainWithGoodPublicity grandfather, Rezo, made him into a SuperSoldier by merging him with a stone {{Golem}} (giving him SuperStrength, SuperToughness and {{Nigh Invulnerab|ility}}le skin) and a Brau Demon (giving him drastically improved reserves of {{mana}}).
* Like the game it was adapted from, Sorey in ''VideoGame/TalesOfZestiria the X'' can fuse with seraphim. Not only can Rose fuse (with Dezel), but [[spoiler:Alisha can fuse with Edna]]. [[spoiler: Sorey can also fuse with four seraphim at the same time]]
* Numerous examples in ''Anime/TenchiMuyo'', mostly with the OVA:
** Sasami and Tsunami is ''currently'' a Switcher type as Tsunami merged with young Sasami to save her life. The two can't be active at the same time and they have to either switch places or Sasami has to be asleep for Tsunami to act. There are hints, however, that this is also a Power Booster type and, when Sasami gets older, this will become a Composite form.
** Ryoko and Zero-Ryoko ends up pulling a Power Booster type in episode 12. This temporarily drives Ryoko nuts as Zero-Ryoko was head over heels for Tenchi and Ryoko was ''not'' ready for that.
** Ryo-Ohki goes Multi-Form Shapeshifter in Episode 10 when she bonds with the Masu, obtaining her humanoid form.

[[folder: Comic Books]]
* The ''ComicBook/AmalgamUniverse'' was created when the DC and Marvel universes were [[MergedReality merged]]. The superheroes in this new reality were each a combination of two heroes from the two original worlds. For example there was Super-Soldier (Franchise/{{Superman}} + ComicBook/CaptainAmerica), Darkclaw (Franchise/{{Batman}} + ComicBook/{{Wolverine}}), and Lobo the Duck (Lobo + Comicbook/HowardTheDuck).
* ''ComicBook/XMen''
** Jean Grey/Phoenix alternates between being a case of Switcher and TouchedByVorlons, depending on the story.
** One example occurred at the end of the [[https://en.wikipedia.org/wiki/Apocalypse:_The_Twelve Twelve]] storyline, when ComicBook/{{Cyclops}} pulled a HeroicSacrifice to save his family and friends from ComicBook/{{Apocalypse}}. [[http://goodcomics.comicbookresources.com/wp-content/uploads/2015/09/apocalypsedeath4f.jpg The result]] was a gestalt being that was a Composite in appearance and a Power Booster underneath, as it was stated that Apocalypse was in complete control. This wasn't quite true, though, as Cyclops eventually managed to split away from Big Blue and reclaim his humanity.
** ''ComicBook/GenerationX'' features the St. Croix siblings: Gen-X member Monet proves to be a fusion of her little sisters, twins Claudette and Nicole, who had merged to replace the original Monet when she went missing (the twins being 8 years old, their apparent age was doubled to 16 and convincingly passed as Monet in their merged form). Later on, they fuse with their older brother, Marius/Emplate, to become the androgynous M-Plate. The St. Croixs' fusion can be called Composites, but there's more to it than that. The fused forms are more than the sum of their parts, entirely different from the siblings they came from, and with powers that don't always involve those of the source individuals (but then again, the twins' powers have never been fully explored). This means M-Plate was composed of 3 people rather than two, on top of his/her own self, and considered the actions of all before deciding to go with his/her own plan (which is something neither the twins, nor Emplate would have approved). Confused yet? Thankfully M-Plate didn't have long to act before being shattered by Gen-X. It is unknown if the real Monet can fuse with her siblings the way Emplate and the twins can.
*** Monet did fuse with the twins once, when she was freed from the mute form of Penance. The twins merged to create a Monet copy once more, then they merged again with the Penance body, finally splitting again to leave the twins trapped in the Penance body, and Monet herself again (Or a new copy of herself created by the merged twin bodies, it's confusing.)
* The DC Comics character ComicBook/{{Firestorm}} is a Power Booster example. While the nature of the fusion has varied considerably over the course of the character's history, the basic gist is that the host of the powerful Firestorm Matrix can merge with someone else to become the superpowered Firestorm. The other partner in the merge ends up as a voice in the host's mind, able to advise them if need be.
** The post-''ComicBook/BlackestNight'' incarnation of Firestorm is a fusion of Jason Rusch and its first host Ronnie Raymond. There are a couple of problems with this: 1) the Firestorm Matrix is messed up for some reason (possibly related to Ronnie coming back from the dead after ''Blackest Night'') and 2) Jason ''hates'' Ronnie since the latter's Black Lantern incarnation murdered Jason's girlfriend Gehenna by turning her into salt. [[spoiler: The ''third'' entity in the matrix is the Black Lantern persona created by the Black Power Ring.]]
** In the ComicBook/New52, the whole thing gets shaken up. Shortly after Ronnie and Jason meet for the first time, they get transformed into separate Firestorms, who can combine to form a nuclear monstrosity called Fury [[spoiler: - who has a mind of his own]].
* One of the most traumatic experiences in the career of the SpiderMan villain the Sandman was when he teamed up with Hydro Man; an accident caused the two of them to merge into a barely sentient mud monster. When the two villains were eventually separated, the mental strain it had on the Sandman was the biggest reason for his HeelFaceTurn (which, sadly, didn't last forever).
* The walking ContinuitySnarl that is ComicBook/{{Hawkman}}. On a number of occasions, his various conflicting selves were fused just for the purpose of cleaning up his continuity.
* Rebis in ''Comicbook/DoomPatrol'' (version by Creator/GrantMorrison) is a literal example of ''The Composite'' with ''three'' beings, i. e. Larry Trainor (male), Dr. Eleanor Poole (female) and the mysterious "[[EnergyBeings negative spirit]]". The name Rebis denotes precisely the philosopher's stone, intended as fusion of complementars (Alchemical Marriage). The Composite Rebis is a divine hermaphrodite, usually concealed in bandages. Rebis has all of the memories of all three beings and a lot of powers. Finally, he/is/it is immortal, though this might involve some ritual involving a supermarket trolley and a tree that grows on the Moon and god Creator/GrantMorrison smoked a lot of things back in the 90s.
* The various versions of Captain Marvel usually are Switchers; the one owned by Creator/DCComics goes between his powered-form and Billy Batson by shouting ComicBook/{{SHAZAM}}!, and several of the ones owned by Creator/MarvelComics switch between [[ComicBook/CaptainMarVell themselves]] and Rick Jones by hitting together the Nega-bands (as an homage to the Batson switch).
** Likewise, ComicBook/{{Miracleman}}/Marvelman (and cohorts) do their transformations in the same way; the super-powered body is stored in a sort of nullspace until the transformation occurs, and the normal body is there until the superhero changes back.
** Creator/PeterDavid's run on the Marvel series once lampshaded this by having Rick yell "SHAZAM!" when hitting the Nega-bands. When Cap asks him why he yelled that, Rick changes the subject.
** In an issue of ''[[ComicBook/MsMarvel Captain Marvel]]'', Carol Danvers and Monica Rambeau do a variation of this after Monica transforms herself into an EnergyBeing. Once it's over, Monica makes sure to tell Carol to [[LetUsNeverSpeakOfThisAgain never mention to anyone]] that [[DoesThisRemindYouOfAnything Monica was inside of her]].
** Monica Rambeau repeated this by turning into gamma radiation and merging with She-Hulk in an issue of ''[[ComicBook/MightyAvengers Mighty Avengers]]''.
** Before either of these fusions, Carol ended up caught in a TwoBeingsOneBody situation when [[ComicBook/XMen Rogue]] ended up permanently absorbing her powers and memories, even as Carol's own body became comatose.
** It should also be noted that DC's Captain Marvel and the other Marvels empowered by the wizard Shazam are more often depicted as OlderAlterEgo versions of their youthful secret identities than the Switcher version of this trope.
*** This was played with in ''ComicBook/KingdomCome'' with an apparently still-youthful Captain Marvel brainwashed and in service to Lex Luthor, with all of Luthor's villainous allies unnerved by such a powerful hero under Luthor's thrall; in fact, [[spoiler: it was an adult Billy Batson, visually indistinguishable from his OlderAlterEgo and so fearful of the consequences of superpowers that he hadn't transformed for years.]]
** Mighty Man, the CaptainErsatz of DC's Captain Marvel in ''ComicBook/TheSavageDragon'', is a fusion of a host body and an apparently ages-old heroic entity that was locked into the form of a caped superhero in the early 20th century. Moreover, Mighty Man is a young, handsome, '''male''' superbeing no matter the age, looks, or '''gender''' of the host body; for the first 100 or so issues of ''The Savage Dragon'', Mighty Man was hosted by two different [[GenderBender women]]. The host is also subject to the passage of time even while in Mighty Man's form, and can suffer dehydration, starvation, fatigue and muscle atrophy if they don't take time in their normal form to tend to their own physical needs.
* Darkdevil from the ''ComicBook/SpiderGirl''/[=MC2=] 'verse is the result of one of these between Daredevil and Ghost Rider. He appears to be a Composite but is really more of a Power Booster. With, possibly, some spider-powers he got from his [[CloningBlues dad]].
* ''ComicBook/{{Witchblade}}'' uses all 3 main variants at once: when it's time for a little shredding, the symbiont (Witchblade) [[ShapeShifting transforms]] the body ([[MagicPants and clothing, optionally]]) of its host ("wielder") into an absurdly powerful ''composite'' form (including a sort of [[BreastPlate Lingerie Armor]] and in the process [[TheMindIsAPlaythingOfTheBody provoking emotional and mental changes]] that emphasize [[UnstoppableRage destructive]] and {{Stripperiffic}} qualities). The Witchblade is at least semi-sentient, and in the anime it subjected its completely unaware host to the first transformations on its own initiative, which qualifies it as a ''switcher'' variant too. Mostly the host just carries it as an inert and [[SuperweaponSurprise innocuous]] ornament (''power booster'') (moreover, in the anime it's shown implanted but knocked out for years, inactive and near invisible).
* The main versions of ''ComicBook/GhostRider'' are usually composites. Whether or not they're stronger together depends on the ingredients.
* In the Disney Comics CrisisCrossover ''Dangerous Currency'', main villain Negaduck had a swarm of atom-sized versions of himself created, which together form a black inky substance known as the Slime. When another villain merges with the Slime, it turns them into an eviler, superpowered version of their original self, although it is also becomes compelled to obey Negaduck. Several villains can also merge with a single pool of Slime at the same time, which causes results closer to what this trope is usually about. For instance, four Beagle Boys merge iinto a four-headed hulking giant at one point.
* ComicBook/{{Sleepwalker}} is an example of an accidental Switcher situation--he is an alien native to another dimension who became stuck in the mind of a guy named Rick Sheridan. Sleepwalker could freely enter the real world only when Sheridan was asleep. Except for a brief {{Freaky Friday}} situation or two, Rick's body remained alive, normal and in bed when Sleepwalker was loose, and they could only communicate through Rick's dreams.
** The Sleepwalker series also had a villainous example late in its run when a demon from the [[DreamLand Mindscape]], Sleepwalker's home dimension, became trapped on Earth and ended up fusing with a human SerialKiller named Jeremy Roscoe. The result was a nightmarish creature that called itself Psyko, possessed of all of Sleepwalker's warping powers in addition to being able to brutally MindRape his victims and drive them insane. Psyko was somewhere between TwoBeingsOneBody and a [[SuperEmpowering Power Booster]], as Roscoe was in full control of their body and the demon's powers, although apparently the demon could still communicate with him. In his first battle with Sleepwalker, Psyko claimed that the demon wanted to give Sleepwalker a message, and to write it in the alien hero's blood.
** One issue centred around Rick and Sleepwalker being fused into TwoBeingsOneBody after Rick tried to release Sleepwalker while he was awake and it had GoneHorriblyWrong. Being directly fused with Rick drastically weakened Sleepwalker's powers, to the point where they weren't even half as strong as they normally were. Even then, they still managed to defeat the [[ChainedHeat Chain Gang]]. Go figure.
* Another Switcher example was the late 80's-early 90's ''[[ComicBook/TheMightyThor Thor]]''. The Bearded One had befriended a human named Eric Masterson, but when Eric was almost killed on the fringe of one of Thor's battles, Thor used Asgardian magic to merge their forms and save his buddy's life. Thus you had Eric living his everyday life, but [[{{SecretIdentityChangeTrick}} running off at any sign of trouble to stamp his cane on the ground and ta-da!]] Thor.
* In ''[[ComicBook/SonicTheHedgehog Sonic Universe's]]'' "30 Years Later" storyline, we find that Tikal and Chaos have fused into one Composite, Tikhaos. It seems to have some semblance of Tikal's personality, but Chaos' hunger for chaos energy.
* In ''ComicBook/ElfQuest'' after Winnowill's body is killed Rayek absorbs her spirit to prevent it becoming a force of destruction. Since then the two have been vying for control of Rayek's body; on those rare occasions when Winnowill succeeds she can re-shape it into an exact replica of her own. They're not exactly a composite since their personalities remain separate, though it's implied that this may change if ever Winnowill ever renounces her evil ambitions.
* Franchise/{{Batman}} and Franchise/{{Superman}} once found themselves in a world where the villains were Composites of their respective enemies. Examples: Lex Luthor + The Joker, Doomsday + Deathstroke the Terminator, The Penguin + Metallo, etc. The heroes were Composites of Justice League and Teen Titans members, although Wally West was the same because he's on both teams at the same time as Creator/TheFlash. Examples: Hal Jordan + Dick Grayson, Raven + Zatanna, Starfire + Black Canary. Even Gotham City and Metropolis were combined into Gothamopolis. [[spoiler: It was a dream world created by Doctor Destiny.]]
* Cypher and ComicBook/{{Warlock}} of the ComicBook/NewMutants could merge into TwoBeingsOneBody, which usually looked like Cypher covered in circuitry. In fact, Warlock could do this with ''anyone'', except that he risked transforming them permanently.
* Jitterjack from ''ComicBook/AstroCity'' is a villainous composite. He appears as two bisected men joined together lengthwise, with more than double the speed, reflxes, and agility of a normal person.
* The ComicBook/MetalMen can merge into a composite form called Alloy. This ability first appeared in ''ComicBook/KingdomCome'', then migrated into the main continuity during the ''ComicBook/DCOneMillion'' event.
* ComicBook/UltimateMarvel event ''Hunger'' has what appears to be Composite variety with [[spoiler: Gah Lak Tus]] and [[spoiler: Galactus, his counterpart from the mainstream Marvel Universe]].
* ComicBook/{{Galactus}} is the permanent fusion between the Power Cosmic and Galan, the last survivor of the universe preceding the present one. The Power Cosmic was drawn to Galan's refusal to surrender even as the universe died around him. It's no longer clear how much of Galactus is the Power Cosmic and how much is still Galan.
* The ComicBook/JusticeSocietyOfAmerica gets a Power Boost when they merge with the Norse gods to fight the Ragnarok in order to prevent Adolf Hitler from destroying the universe circa 1945 in ''ComicBook/LastDaysOfTheJusticeSociety''. Some of the members even get miraculous healings in the merging, such as with Sandman's heart problems and Wildcat being unable to use his legs.
* At the end of the Avengers OGN Rage of Ultron, [[spoiler:Ultron and his creator Hank Pym are merged into a single, half-organic, half-cybernetic being. However, because Ultron's personality was a copy of Pym's in the first place and he was acting on Pym's subconscious misanthropy, Pym makes no attempt to fight Ultron's control]].
* Creator/DCComics OccultDetective BattleCouple Comicbook/DoctorOccult and Rose Psychic had their souls bonded by a magical ritual in order to save the life of one of them.[[note]]Accounts vary on which one it was whose life was being saved[[/note]] As a result, they must "time-share" with only one of them permitted physical existence at a time.
* ComicBook/MickeyMouseComicUniverse: The 1990 comic book series ''Mickey Mouse Adventures'' had Professors Ecks and Doublex, two of the three monkey mad scientists that Mickey Mouse faced in the Floyd Gottfredson comic strip story ''Blaggard Castle'', return as a recurring villain known as Dr. Doublecross, a two-headed being that was created when a mishap with a cloning ray fused Ecks and Doublex together.
* Deadpool and Madcap were once both reduce to piles of ash that ended up mingling together. [[FromASingleCell They regenerated]], but in the body of Deadpool [[TwoBeingsOneBody with Madcap becoming another voice in his head]]. They unfused when Deadpool gets their body ripped in half, the two halves regenerating into their separate bodies.
* A crossover comic from the late 90s, ''ComicBook/{{Superman}}/ComicBook/{{Madman}} Hullabaloo'' featured an odd variation; Due to the machinations of Mr. Mxyzptlk, Superman and Madman were transplanted into each other's universes, each one acquiring different traits of the other in a weird mix of this trope and FreakyFridayFlip.
* While nothing was done with it (in part because of ''ComicBook/TheCrossing'', Teen Tony, and ''ComicBook/HeroesReborn'' being {{Dork Age}}s), this is currently what [[Franchise/IronMan Tony Stark]] is: [[http://www.cbr.com/abandoned-love-the-titanic-tale-of-teen-tony-stark-aka-iron-teen/2/ a fusion of the classic Tony and Teen Tony]] created by [[ComicBook/FantasticFour Franklin Richards]] when he saved the Avengers and the Fantastic Four from the events of ''ComicBook/{{Onslaught}}''.
* ''ComicBook/TheUltimates2015:'' After suffering a serious case of SanitySlippage, [[spoiler:Master Order and Lord Chaos hunt down their servant, the In-Between, and devour him so they can transform into a new being called Logos, a contorted fusion of faces, arms and wings.]]
* One What-If? comic for Marvel had Reed Richards, Bruce Banner (who never had a Hulk persona when transformed as that what-if's divergence), and Professor X being forced to fuse into a single 10' tall glowing golden being in order to battle Galactus when he arrived. It formed its own identity of the X-man, retaining only the desire to battle Galactus and after a fierce mental battle just barely drives off Galactus before reverting to its components, none of whom retain their super-powers as they were consumed by the transformation.
* The conclusion of ''ComicBook/SupermanReborn'' has this happen to [[spoiler:the pre-Flashpoint Superman and his ComicBook/New52 counterpart]] and also to [[spoiler:the pre-flashpoint Lois Lane and her New 52 counterpart]]. The circumstances of this fusion actually cause a [[spoiler:CosmicRetcon, where history itself is altered so that the composite versions have ''always'' been the only ones present]].
* In ''ComicBook/ZeroHour'', Waverider from ''ComicBook/Armageddon2001'' as well as Monarch fuse together to form Extant, while the Golden Age Hawkman and Hawkgirl fuse together with the modern age Hawkman and the Hawk-God to form the Post-Zero Hour version of Hawkman.

[[folder: Fan Fiction]]
* ''FanFic/DungeonKeeperAmi''
** Keepers have the ability to possess their minions. This gives the keeper access to skills and powers possessed by the minion in question.
** This gets taken one step farther with youma, whose appearance is determined in part due to their self-image. As a result, when possessed, they become literal amalgams of Mercury and whatever they looked like before.
** Taken yet further by Tiger, who possessed Mercury while she was also possessed by the Dark God Crowned Death. In that case, not only did Mercury and Tiger's features blend, but Mercury's armor fused with her/them. resulting in a towering, muscled amazon with metal skin and the burning Crown of Crowned Death. Badass!
* In ''FanFic/PokemonMaster'' [[spoiler: Misty and her lost twin 'sister' Valdera merge together to form Mistaria, resolving Ashura's love interest problem]].
* In ''Fanfic/TheThreeSisters'', [[spoiler:Cocoon sacrifices herself to save both Rarity and her sister Pupa by fusing them into one entity]].
* A powerbooster variant happens with Triverion, [[spoiler: who happens to be three Eevelutions merged into a... multi-headed dragon thing]]. It also happens with [[spoiler: Mikey's Eevee and Missingno]].
* Fanarts of a unified Germany and Italy can be found on Website/DeviantArt. They are usually composites.
* [[FanFic/UltimateSleepwalker Sleepwalker]] and his human host Rick Sheridan ended up becoming bonded with one another. Sleepwalker became trapped in Rick's mind and could only emerge when he fell asleep or unconscious. One notable occasion reversed the fusion and Rick's consciousness ended up in Sleepwalker's mind, which allowed them to temporarily return to Sleepwalker's home dimension, the Mindscape.
* A scary example of the shapeshifting type in ''Winter War''. Aizen's Hollowification experiments fuse shinigami with their zanpakuto, the results being Tortured Abominations who still retain enough awareness of their situation to make the whole matter ''even more'' horrific.
* In ''Fanfic/TheSwarmOfWar'', the Overmind does this with ''bases''. A Hive merged with a dozen Spine Crawlers and Spore Crawlers is not something to take lightly.
* {{Inverted|Trope}} in ''FanFic/DiariesOfAMadman''. The various races of pony were created when Discord literally split the alicorns into three.
* In the universe of [[Webcomic/TheGreatestGift Ask Twixie]], Twilight never became an alicorn, so she and Cadance did this in order to handle Tirek.
* In one chapter of ''[[FanFic/MonstersInParadise Monsters In Paradise,]]'' a naive Mismagius triggers a fusion with Marisa Kirisame completely by accident. The end result has Marisa's face, hat and hair, but Mismagius' dress-like body. Whether Marisa gained any powers from the fusion or not isn't brought up, though.
* In [[Fanfic/APonyOutOfPlace Flames And Twilight]], [[spoiler:Flare and Nightmare Moon become Knightmare Nova after Flare puts on the Alicorn Amulet.]]
* In the climax of [[Fanfic/TheDearSweetieBelleContinuity "Cutie Mark Crusaders Dream Warriors"]], the CMC do this in the dreamscape to [[spoiler:finally defeat [[ArchEnemy Feather]] [[BigBad Duster]] for good]]
* In ''Fanfic/SevenDaysInSunnyJune'', the human Octavia Melody is a chimera, having absorbed her twin in the womb. Needless to say, this fact greatly disturbs her.
* It's revealed that ''[[http://www.fimfiction.net/story/237978/how-trixie-somehow-saved-hearths-warming How Trixie (Somehow) Saved Hearth's Warming]]'' that the three Windigos from the story were actually each thousands of Windigos merged into one due to the abundance of hatred running rampant at the time causing their population to skyrocket. [[spoiler:[[BigBad Leidr]], while a mutant sapient Windigo, is capable of this fusion as well and does so with his two nonsapient heardmates to go OneWingedAngel.]]
* In ''Fanfic/TheBridge'',
** It's revealed the BigBad [[spoiler:Bagan]] is a permanent fusion of three super ancient kaiju named Doragon, Mizu, and Enjin, who did so to save the world long ago (before [[FallenHero he eventually fell to evil]]). He can project clones of them to act as Avatars, but they are now mindless extensions of his will.
** While she goes by Mothra, Lea is more accurately a fusion of Mothra and Battra resulting from the Earth lacking the necessary mana to remake Battra after his death and instead merging his essence and power with Lea's egg to create a hybrid of both divine moths. According to WordOfGod, it is similar to the process that created [[spoiler:Bagan]], but unlike him she can still reproduce asexually and could theoretically create a new independent Mothra and Battra by doing so. The same applies to her MirrorUniverse counterpart Battra Lea.
* In the ''Fanfic/PonyPOVSeries'':
** Several ponies are the result of a Shadow of Existence fusing with a pony to create a new being. For example [[spoiler:Twilight is the result of Minty's Light of Existence merging with the Shadow of Existence of G1 Twilight, Rainbow Dash is G3 Rainbow Dash fused with Firefly's Shadow of Existence and so on.]] If a person's Light of Existence is the one the Shadow originally possessed (as their Light reincarnated while their Shadow went to Oblivion), they recreate the original soul [[spoiler:such as Yearling and Puzzlemint's Shadow of Existence merging, which thanks to Pandora resulted in them also becoming the real Daring Do, and Lovestruck fusing with Cupid's Shadow of Existence to reconstitute his Concept.]] However, it's noted the two ''must'' be compatible, otherwise it will go ''very'' wrong. This is especially true of the Shadows of Concepts, as while the end result is never shown, it's universally stated to be a FateWorseThanDeath and create something horrific.
** [[spoiler:Nightmare Eclipse forcibly fused every Twilight with herself every time the GroundhogDayLoop that she'd trapped Discord in reset. [[KarmicDeath Fittingly enough]], when defeated, Eclipse was forcibly fused with Twilight, resulting in Amicitia coming into being. This is a complicated one, as while Amicitia has all of Eclipse's memories, the Eclipse persona was [[DeaderThanDead completely destroyed.]]]]
* In the MagicalGirl CrisisCrossover ''FanFic/ShatteredSkies'', the manga and 90s anime versions of [[Franchise/SailorMoon Rei Hino]] merge together after anime!Rei takes a life-threatening injury. The result is a slightly unstable "fusion Sailor Mars" with elements of both personalities.
* In ''Fanfic/UniverseFalls'', [[WesternAnimation/StevenUniverse Steven]]'s ability to perform Fusion with humans extends to his friends [[WesternAnimation/GravityFalls Dipper and Mabel]]. There's a three-part mini-arc devoted to introducing not only "Stevonnie", but also "Maven" (Steven + Mabel) and "Stepper" (Steven + Dipper).

[[folder: Fan Games]]
* ''VideoGame/BattleMoonWars'' gives us the ninja [=RoSHIaKI=], a fusion of Michael Roa Valdamjong and Tohno SHIKI ([[spoiler: Roa's 18th incarnation, who is ''not'' the same person as the protagonist of ''VisualNovel/{{Tsukihime}}]]).
* ''VideoGame/MushroomKingdomFusion'' uses the Power Booster variant: The playable characters can gain forms representing popular characters that are not playable. For instance, Mario has a VideoGame/{{Mega Man|Classic}} form and a [[Franchise/{{Halo}} Master Chief]] form, and Luigi has a Protoman form and a Red Spartan form.

[[folder: Film]]
* In ''Film/RoboGeisha'', [[spoiler:cyborg assassin sisters Yoshie and Kikuyakko merge together, using their combined powers and weapons to defeat Hikaru and foil his plans.]]
* The Station aliens in ''[[Film/BillAndTed Bill and Ted's Bogus Journey]]'' can body-slam into each other to form a larger, muscular alien.
* At the end of ''Film/TheDarkCrystal'', the surviving urRu and Skeksis are rejoined into their original [[{{Precursors}} Urskek]] forms.
* In ''Film/DudeWheresMyCar'', the Alien Jumpsuit Chicks merge together into one [[AttackOfThe50FootWhatever Super Hot Giant Alien]].

[[folder: Literature]]
* Creator/MichaelMoorcock's [[Literature/TheElricSaga Elric]] temporarily merges with two of his Eternal Champion alter egos from different worlds in order to save the multiverse. They become a three-headed, six-armed superbeing. An another opportunity, he merges with three of them.
** Moorcock is obviously ''very'' fond of this trope. In [[spoiler: ''The Final Programme'']] the protagonist merges with his (female) rival to create a hermaphroditic superhuman. In [[spoiler: ''The Dreamthief's Daughter'']] the protagonist, an alternate-universe Elric, merges with him in order to overcome many challenges. And in [[spoiler: ''The City in the Autumn Stars]] something similar is attempted, but the experiment fails because they just didn't have the technology yet.
* In Emily Rodda's ''Literature/DeltoraQuest'' series, mild Steven never has to fear danger, for [[spoiler: his brother Nevets]] dwells within him, and at the first sign of danger can rise to the surface and destroy every living creature within the reach of his fists. While Steven doesn't fear [[spoiler: his brother]], he has on several occasions suppressed his emergence, since [[spoiler:Nevets]] [[{{Berserker}} doesn't distinguish between friend and foe and would kill even the young heroes if they got near him]].
* At the end of Creator/PiersAnthony's ''[[Literature/ApprenticeAdept Unicorn Point]]'', after merging the worlds of Photon and Phaze together, The entire sentient population of Phaze became Switchers, merging with their opposite number from Photon. The only exceptions were Photon residents who hadn't been on the planet long enough to have gained an "other self," or those whose alternate selves happen to have died.
* In the Creator/IsaacAsimov novel "The Gods Themselves", the aliens come in three different genders (Rational, Parental and Emotional) who use this to have sex and [[spoiler:create their mature, final solid form, the Hard Ones]]
* The Composite happens during a battle with Lucifer in the book ''Literature/{{Magnus}}'' by Matthew Dickens.
* In ''The Moment of the Magician'', Jon-Tom fights a spellsinging duel against four demonic creatures, whose bodies gradually fuse into a literal one-man-band. [[spoiler: This results in a "fusion dance" of a different sort, when Jon-Tom spellsings it/them into submission with his rendition of the Pointer Sisters' "Neutron Dance", and they explode in a miniature mushroom cloud!]]
* ''Literature/CodexSeraphinianus'' has a page or two (which usually also doubles as cover art) of a human man and woman fusing together to form an ''alligator'', and provides a very detailed and somewhat unsettling series of images of their bodies merging into a single creature.
* In ''Literature/CityOfIllusions'' by Creator/UrsulaKLeGuin, two minds who have lived sequentially in the same body (after one was erased and the other grew in its place, then the first one was restored) end up in joint control. Since their enemies have told a different story to each of them, they are able to see through the lies by working together.
* In Creator/StormConstantine's ''Literature/BuryingTheShadow'', the eloim naturally have sex through fusion dance. Occasionally the fusion will be permanent, resulting in a creature called a Harkasite. The practice is largely taboo by the beginning of the book in favor of more human sexual behaviors.
* In Simon Hawke's ''The Wizard of Santa Fe'', Billy Slade starts out as a teenager who shares his body with the spirits of two millennia-old archmages. When Billy suffers a lethal wound, both possessing spirits simultaneously sacrifice their own energies to save his life, and the three of them undergo a Fusion Dance, transforming Billy's body into an adult that shares their physical traits and magical aptitudes, while blending aspects of their personalities with his.
* [[Literature/{{Dragons}} The Last Dragon Chronicles]]: This happens when the Fain "commingle." [[spoiler: By the end of Book Four, David also contains Ingavar, Thoran, Dr. Bergstrom, ''and'' G'lant. That's a lotta people in one body.]]
* In the Literature/EighthDoctorAdventures book ''Alien Bodies'', it's mentioned the [[NotSoHarmlessVillain Krotons]] will ultimately become a single gestalt race, the Ixtricite, with another crystalline race called the Rhotons and some other race whose name the Doctor can't recall.
* In ''Literature/Heretical Edge'', some people [[WillingChanneler willingly let themselves]] be [[DemonicPossession possessed]] by a [[OurAngelsAreDifferent Seosten]], resulting in the Power Booster variant; Seosten can use their perfect memory, communicate with their host, control some of the host's powers, and apply temporary multiplicative boosts to all of the person's natural and supernatural abilities. The trouble is [[LightIsNotGood finding a Seosten willing to do this...]], as [[FantasticRacism very few of them will cooperate with races they see as inferior.]]
** Apollo was revealed by WoG to offer this to various thrill-seekers so that together they could pull dangerous stunts without him being recognized.
** Enguerrand, though not a Seosten himself, has their powers. In addition to possessing his opponents, he occasionally possesses [[PersonOfMassDestruction Gabriel Prosser]] to supercharge Prossor's [[SuperpowerLottery already impressive powers]].
** [[spoiler:Jophiel and Elisabet]] form a romantic version of this.
** [[spoiler:After learning she was possessed by Tabbris, Flick]] proposes this.
** Chayyiel, already one of the most powerful Seosten, wants a powerful host she can do this with. [[spoiler:She had her sights set on King Arthur before Puriel took him out of play.]]
* In the ''Literature/ParadoxTrilogy'', phantoms come in sizes ranging from smaller than a finger to larger than a planet. It turns out that larger phantoms are formed by many smaller phantoms fusing together.
* In ''Literature/ParadiseLost'', of all places, this is how angels are said to make love, melting together and just ''loving'' each other. [[HoYay Note well]] that no explicitly female angels are ever shown in the poem... So yes, [[Creator/JohnMilton an old Puritan man]] did this trope centuries before any other example you're likely to name.
* In the ''Literature/JacobsLadderTrilogy'', one source of conflict is that the divided Angels must perform one to reunite into a single AI capable of controlling the entire ship. However, only one mind will be in control of the worldsoul produced by the fusion, and each Angel wants to be the dominant one. [[spoiler:Ultimately, Rien's interference in the process results in the birth of the Angel Nova, which has a unique identity of its own rather than the mind of any of its components]].
* In ''[[Literature/{{Nightside}} Paths Not Taken]]'', two minor villains - a married couple who'd bargained to ensure they'd [[BeCarefulWhatYouWishFor never be parted]] - incur some karmic retribution for their misdeeds, and are fused into a single monstrous creature. [[spoiler: It's strongly implied, albeit not stated outright, that the resulting creature will become the Lamentation.]]
* At the end of ''Discworld/ThiefOfTime'' [[spoiler: Lobsang Ludd and Jeremy Clockson, temporal duplicate sons of the AnthropomorphicPersonification of Time, merge with each other to become a Composite. (Jeremy has an innate and very precise sense of timekeeping; Lobsang has an instinctive understanding of the work of the History Monks, and together he has the full powers of his mother and enables her to retire.) The Composite decides to keep being called Lobsang, though, because Jeremy was pretty screwed up and never really ''liked'' being Jeremy.]]
* ''LightNovel/UndefeatedBahamutChronicle'': Gatouhan's Drag-Ride has the special ability of fusing living organisms with other living organisms or inorganic matter with other inorganic matter (but not living organisms with inorganic matter). He can fuse multiple Abyss to create hybrids with the powers of their constituents, such as Gargoyles that have the invisibility of Phantoms. He can also fuse anything used to attack his Drag-Ride and either shoot it back as projectiles or convert it into additional armor. When at a disadvantage, he fuses with his two allies (with their consent), healing his injuries with their flesh and upgrading his Drag-Ride into a three-headed one with the combined capabilities of all three.

[[folder:Live-Action TV]]
* ''Franchise/PowerRangers''
** ''Series/PowerRangersInSpace'': Darkonda can force Ecliptor (and possibly others, though we've never seen it) to fuse with him, becoming Darkliptor. Darkliptor has the design and weapons of both, but the voice and will of Darkonda only. (Ecliptor has been able to force a separation, but not control the combined form.) Another case of a Power Booster that looks like a Composite.
** [[Series/PowerRangersSPD Jack]], [[Series/PowerRangersMysticForce Nick]] and [[Series/PowerRangersOperationOverdrive Mack]] ALL gained their "battlized" forms by fusing with allies: the RobotBuddy R.I.C, the dragon Fireheart and the Sentinel Knight. Sentinel could talk (through a giant face on the armor; it's as unnerving as it sounds) but it's not clear if he could take the driver's seat. Again, Power Booster disguised as Composite.
* In one episode of ''Series/StarTrekVoyager'', Neelix and Tuvok are accidentally merged together. The new hybrid character "Tuvix" (played by a new actor) didn't want to be separated, and Captain Janeway did it by force. Tuvix had several of the positive traits of both component beings, including a sense of humor (which Tuvok didn't have) and edible cooking (Neelix was a decent cook, but all the dishes he knew how to prepare were radically different from Alpha Quadrant tastes).
* ''Series/BuffyTheVampireSlayer'':
** In the climax of season 4, the Slayer temporarily merges (mentally) with her three sidekicks to acquire Willow's magical talent, Giles's obscure knowledge, and Xander's heart. (If you're thinking [[WhatKindOfLamePowerIsHeartAnyway so what]], go watch any number of episodes where he demonstrates non-powered bravery.)
** The First Evil does one with Caleb.
* ''Series/KamenRiderDenO'' has a form of Composite and Power Booster fusions. Ryotaro (and to a lesser extent, Yuuto) contract with various [[NobleDemon heroic]] [[MonsterOfTheWeek Imagin]] who [[DemonicPossession possess]] their partners. This results in the possessed human's body being controlled by the Imagin and speaking with his voice while gaining some outward physical changes (like glowing eyes and a lock of hair, both in the Imagin's [[ColorCodedForYourConvenience personal color]]). This also extends to their Rider forms, where an Imagin taking control causes the Rider suit to change armor, weapons, and abilities based on the Imagin's personality.
* ''Series/KamenRiderKiva'' does the Power booster example. Kiva gains alternate forms by using his allies as weapons.
* ''Series/KamenRiderDouble'' uses a similar Composite[=/=]Power Booster setup, except that instead of a MonsterOfTheWeek, the protagonist Shotaro gains the consciousness of his human partner Philip when they transform into the titular Rider (Phillip's body falls unconscious as long as Double is active). Double himself speaks with the voices of his individual parts in unison, though both halves can also engage in conversation with each other. MidSeasonUpgrade [=FangJoker=] reverses the dynamic, using Phillip's body and Shotaro's mind, while for Double's SuperMode [=CycloneJokerXtreme=], the TransformationTrinket actually absorbs Phillip's body and merges it with Shotaro for a true Fusion Dance.
* The ''Franchise/UltraSeries'' often uses a Switcher-type for its heroes, having an alien Ultra-being bond with a (typically recently dead) human. There have also been composite types.
** ''Series/UltramanAce'' actually has a double example, with Ace bonding with two humans, a man and a woman, who would then fuse together to give him control. [[spoiler:This is dropped after about halfway through the series when Yuko Minami (the woman) is PutOnTheBus.]]
** Series/UltramanCosmos and Ultraman Justice fuse into Ultraman Legend in TheMovie ''Ultraman Cosmos vs. Ultraman Justice: The Final Battle''.
** In the GrandFinale of ''Series/UltramanMebius'', [[spoiler:Mebius, Ultraman Hikari, and GUYS merge into Phoenix mode, thanks to ThePowerOfFriendship, and utterly destroy the BigBad with it.]]
** Ultraman Mebius can also fuse with the first six ultra heroes to become Infinity mode, which is used in the ''Mebius and the Ultra Brothers'' movie to battle the gargantuan U-Killersaurus. This is more of a power booster.
** Franchise/UltramanZero, Series/UltramanDyna, and the before-mentioned Cosmos fuse into Film/UltramanSaga in the movie of the same name in order to battle the {{kaiju}} Hyper Zetton.
** Series/UltramanGinga and Victory can become Ginga Victory, though it required some training from Ultraman Zero to achieve it, as seen in TheMovie.
* ''Series/{{Dollhouse}}'': Echo and Alpha are both prime examples of this; to a lesser extent, other dolls are as well.
** Even the individual imprints are, since they are usually composites of different people made into one personality.
* ''Series/HyakujuuSentaiGaoranger''; After being reduced to puddles of goo, the three Highness Duke Orgs are combined into the Ultimate Org Senki, who possesses elements of all their bodies.
* In ''Series/KaizokuSentaiGokaiger'', when Gai can't decide which of ''[[Series/EngineSentaiGoOnger Go-onger]]'''s {{Sixth Ranger}}s he wants to [[PowerCopying transform into]], the keys combine into one that has the power of both Go-on Wings. A Composite type, since the suit is half-and-half ala Double (he even riffs on their catchphrase), and Gai has two Rocket Daggers available.
** He does it again later with the [=GokaiRed=] and [=GokaiGreen=] keys, in a one-time fusion to create [=GokaiChristmas=].
** And then there's his SuperMode, gained by merging all the SixthRanger keys into the Golden Anchor Key.
** An {{Omake}} has Gai and Marvelous fuse together into a hilarious mishmash of each other, which passes down to their initial transformation, which utterly confuses the announcer upon seeing the silver jacket of [=GokaiSilver=] with the red helmet and boots of [=GokaiRed=]
* On ''Series/TeenWolf'', [[spoiler: the twin brother [[OurWerewolvesAreDifferent Alphas]] Aiden and Ethan can do this to become a big super-Alpha]].
* ''Series/MysteryScienceTheater3000'' "Mitchell":
--> '''Dr. Forrester:''' "Oh, Frank, look! Remember? The double butt graft! My science project from Evil-O's. I grafted the butt of a dog onto the butt of a cat. Sure, they all laughed...."

[[folder: Multiple Media]]
* In ''Toys/{{Bionicle}}'', any three Toa of different [[ElementalPowers elements]] can merge and form a Toa Kaita. The only exception is a Toa of Light and an evil Toa of Shadow (technically not a Toa anymore, as Toa means "hero"), since the two elements cancel each other out. The Kaita fusion merges the three minds into one, creating a new being wielding their powers along with a boost in strength. Other creatures have also shown the ability to form a Kaita, most notably the [[CombiningMecha mechanical Bohrok]], Bohrok Va, Bohrok-Kal and [[EliteMooks Rahkshi]]. So far, only the Rahkshi have gained new powers from merging. If a Kaita's mind loses concentration, it will split into the individual beings again. In addition to Kaita there are also a Matoran Nui and Turaga Nui, which combines six beings instead of three. However, these tend to last shorter, as the concentration required to maintain it is immense. Legend has it that a Toa Nui could be formed, rivaling even the power of the [[PhysicalGod Great Spirit]] [[HumongousMecha Mata Nui]]. However, WordOfGod says that it is not possible.
** The Kaita so far shown are Akamai ([[PlayingWithFire Tahu]], Onua and Pohatu), Wairuha ([[BlowYouAway Lewa]], [[KillItWithWater Gali]] and [[AnIcePerson Kopaka]]; plus its upgraded Toa Nuva version), Bohrok Kaita Za (Tahnok, Nuhvok and Pahrak (coincidentally the same elements as the Toa)), Bohrok Kaita Ja (Lehvak, Gahlok and Kohrak; plus it's Kal-version), Rahkshi Kaita Za (Tuhrak, Lehrak, Kuhrak) and Rahkshi Kaita Vo (Vohrak, Guurahk and Panrahk). Yes, ''BIONICLE'' characters of the same elements and species tend to have similar sounding names; why are you asking?
** Also Takutanuva, the merged light/dark being formed when [[SixthRanger Takanuva]] switches {{mask|OfPower}}s with [[BigBad Makuta]] while submerged in [[SentientPhlebotinum Energized Protodermis]]. It appears to be a Composite type, although the personality seems more akin to [[MessianicArchetype Takanuva]] than [[EvilOverlord Makuta]].
*** This was more or less FridgeLogic-ed when it was revealed that this was because Makuta's plan meant he decided to remain more-or-less dormant.
** All these are represented by using the instructions put together from the individual ''BIONICLE'' instruction manuals to build a new, bigger model from all their parts combined. The spiritual predecessors of the ''BIONICLE'', the ''{{Toys/Slizers}}'' and ''Toys/RoboRiders'', also had this feature.

[[folder: Roleplay]]
* In ''RolePlay/YuGiOhEastAcademy'' [[spoiler: Denero and Meteor are forced in to doing this during the duel against his parents, proving the latter's conviction but also hoping to gain the power to win]] Marcus seeming to be unable to keep a monster on the field for them had not helped matters.

[[folder: Tabletop Games]]
* In ''TabletopGame/MagicTheGathering'', [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=27564 Feral Shadow]], [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=3278 Breathstealer]], and [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=3319 Urborg Panther]] can fuse to form the [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=3315 Spirit of the Night]]. Well, that's the flavor of it anyway.
** The background fluff also has a Power Booster example: The plane of [[{{Qurac}} Rabiah]] was split into 1001 individual versions, each with a counterpart for each resident of the original, except for one man, Taysir, who was reflected only five times (one for each colour of mana). The black Taysir was manipulated into fusing with each other Taysir, which resulted in him becoming the most powerful planeswalker in the multiverse until Urza ascended.
** More recently, there's Karona, a merging of three women.
** Planes tend to merge and split a bit. This can be quite jarring to the inhabitants, as in Alara or Kamigawa, and it was actually the entire point of the creation of Rath.[[note]]Yawgmoth couldn't attack Dominaria directly for some reason, so he created Rath to send his troops to, and when Rath merged with Dominaria, yeah.[[/note]]
** Mechanics-wise, Rath has a race called Spikes, 0/0 creatures (in other words, too weak to live) who come into play with +1/+1 counters (making them strong enough to live), but you can remove them to put them on other creatures, or for other effects. You can also equip one living weapon on another living weapon.
** The expansion ''Eldritch Moon'' introduced a mechanic called "meld", which involves flipping two cards over and combining them into a new creature.
** [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=439521 Grusilda, Monster Masher]] can combine any two creature cards from graveyards into one creature.
* In ''TabletopGame/{{Exalted}}'', there's a Solar Circle Sorcery spell called "Unity of the Closed Fist" found in the White Treatise. It creates the composite variant but adds all the elements of the different types of Exaltations involved. It can combine up to five individual Exalts, thus the name--five fingers making a single closed fist.
** Alchemicals have a version known as Synthesis of Divine Affiliation, which can affect six instead. However, the only way that you'll be using it to fuse one of each caste of Alchemical is when everything has gone to hell, because the sixth caste are supposed to go completely unseen until at least four varieties of brown gooey substance have hit the fan.
* In ''TabletopGame/GeistTheSinEaters'', Sin-Eaters are the power booster type, having a Geist that fused its soul with theirs, giving them ghost-like powers and abilities, as well as near immortality. The Caul Manifestation takes this one step further, as the Geist (which is usually just a presence in the back of the Sin-Eater's head) merges with the Sin-Eater, enhancing his form and granting him new powers.
** And in the TabletopGame/OldWorldOfDarkness, the Blood Brother bloodline of vampires naturally came in packs that could fuse together into [[TwoBeingsOneBody a grotesque mashup]].
** Also from the Old World of Darkness were the ''vozhd'' war ghouls, produced by Tzimisce vampires by taking around a dozen or two ghouls (usually human) who were then [[BodyHorror fleshcrafted into one gargantuan near-mindless fleshy engine of destruction and mayhem]]. Their heyday was during the dark ages - not only is modern usage of them too attention-grabbing in most situations, modern advances in weaponry mean that they're much easier to defeat than they were before, [[AwesomeButImpractical usually making them a waste of resources]].
* In ''TabletopGame/{{Deadlands}}'', a Harrowed is formed by fusing a deceased man and a demon. It's a Switcher, because only one of the two is in control at any time, but they share the powers pool. In case of the good Harrowed, it's also EnemyWithin.
* ''TabletopGame/DungeonsAndDragons'':
** Edition 3.5 has a high-level power called "Fusion", for Psions who specialize in Psychometabolism. The power lets the user combine with a willing creature taking on all their abilities, combining hit points, the best of saves, skills, attacks, and ability scores. If both used psionics they even combined their power point pool.
** The ''Book of Exalted Deeds'' introduces Channeling, which allows Celestials (Outsiders from the good-aligned planes) to merge physically with a mortal (as an equivalent of the fiends' DemonicPossession). It works only on willing mortals and gives them serious boost to mental stats, and share all skills and supernatural powers of the Celestial. Powerful Celestials have this as a power, and lesser ones can profit of Channeling too if the mortal cast the appropriate spells.
* ''TabletopGame/{{Shadowrun}}'' has the Inhabitation Creature Power. This power is mostly seen in Insect Spirits. Under the Fifth Edition rules, to summon an Insect Spirit, it must inhabit a living or dead vessel. When an Insect Spirit inhabits a body, it may take on one of three forms: True form, Hybrid form or Flesh form. All three resemble '''Power Booster''' in that the spirit gains a phsical body although hybrid and flesh forms also gain some or all of the vessel's knowledge and/or skills as well as gaining other extra powers. The Hybrid form also resembles '''The Composite'''. In all cases, the Spirit has full control over the host.
* The Ritual of Union in ''TabletopGame/UnknownArmies'' is a power-booster version, with a few twists.[[note]]Neither participant knows in advance which personality becomes dominant, the "winner" can choose which body's form to use, and the whole process is extremely mentally stressful.[[/note]]
* ''TabletopGame/YuGiOh'':
** Monsters can fuse using a card called Polymerization, although this is usually AwesomeButImpractical due to the fact that, as with any other card, you can only have three Polymerization cards in a deck. There are many variations of Polymerization, though, including a [[FieldPowerEffect Field Spell Card]] that allows you to use the effect of Polymerization at any time.
** This is the [[Metaplot/YuGiOhHiddenArsenal Gem-Knight]] archetype's main gimmick. Later on, "Gem-Knight Lazuli" fused itself with the 12 "Constellar" monsters to become "Constellar Sombres" in order to defeat "Sophia, Goddess of Rebirth" together with "Evilswarm Kerykeion", who's also the result of several fusion dances.

[[folder: Toys]]
* Franchise/{{LEGO}}'s ''WesternAnimation/{{Mixels}}'' line has this as its main gimmick. If two Mixels merge they'll either become a Mix, which is a Power Booster/Mixed Form Shapeshifter with one Mixel dominant and the other giving them their powers, or they'll become a Murp, which is a misshapen Composite that has its own personality and the Mixels' powers with no control over them. If three Mixels of the same tribe merge they'll become a Max, which is a large bestial Composite.

[[folder: Video Games]]
* Though it contains more than 2 beings, ''VideoGame/CrashBandicootTheHugeAdventure'' gives a composite form of all the game's bosses which you must run away from in a "true" final level (while avoiding freighter's worth of Nitro Crates, to boot). This ending can be unlocked if the player has gathered all the gems and relics in addition to the Crystals, naturally.
* ''VideoGame/PuzzleAndDragons'' lets you fuse several {{Mons}} together, usually three to five at once. These fusions let your mon evolve into a stronger new form, with the evolution usually ''not'' similar at all to the mons you chose to fuse it with. Power Booster.
* ''VideoGame/BlueDragon'' has Ultimate Szabo, which is all five Demon King Robots at once.
* Several occurrences of this appear in the ''Franchise/BreathOfFire'' series:
** The first game has Karn, whose only "power" is his ability to fuse with other party members to create powerful fused forms. The power is [[PermanentlyMissableContent entirely missable]], which can make Karn entirely useless. He gets a form which can only be used underwater [[PowerUpLetDown after the only underwater section in the game has finished]].
** Ryu's [[InfinityPlusOneSword Infinity Plus One Dragon]] in the first game also allows him to absorb all his partners to form one giant dragon with physical features from all of them. It always does maximum damage with every attack, making most bosses a breeze.
** The two bosses Balio and Sunder from ''VideoGame/BreathOfFireIII'' perform their own fusion to fight the protagonists. Ironically, it's [[HopelessBossFight the only defeatable form]]; all but one of its attacks are toned down versions of attacks the two had separately, and it can only perform one attack per turn versus two for the two separately. Ouch. Its appearance is also a major ShoutOut to ''Series/{{Ultraman}}'', complete with an energy beam performed with the distinctive L arm pose.
*** There's also a Miracle gene and Tiamat form in ''[=BoF3=]'', which allows replaces the party with one gigantic dragon. (The Fusion gene might seem like an example, but Ryu never absorbs other party members when using it; he just [[PowerCopying copies their attributes]].)
** In ''VideoGame/BreathOfFireII'', powering up your teammates takes the form of fusing them with different elemental Shamans. This can have minor effects (turning Sten's fur red) to major effects (changing the nigh-JokeCharacter Jean into one of the game's most powerful characters).
* At the end of ''VideoGame/{{Darkstalkers}} 3'', Lilith fuses with Morrigan as a Power Booster. Lilith was originally part of Morrigan, split off precisely because their combined form was strong enough to threaten dimensions and the established order. Due to the time they spent apart, they ''still'' got more powerful, by being able to split in order to do two-pronged attacks.
* Near the end of ''VideoGame/LegacyOfKain Defiance'', [[spoiler: Kain and Raziel]] do the Power Boost version.
* In ''AdultVisualNovel/PrincessWaltz'' Protagonist perform composite fusion twominds/onebody with one of six other characters to create "Sword Princess Iris" who always looks the same except her dress colour (which depends on a character main hero fuses with). He also often comments on how Iris feels Taller or Faster depending on fusion partner. Game has pretty straight storyline, so no matter which one of 5 [[spoiler:6 Chris is a girl too]] girls you chose, you always end up with [[spoiler:Chris as Main "Wife" and others as lesser harem]]
* In the ''VideoGame/MegaMan'' series, Mega Man and Bass can perform a Power Booster fusion with their respective canine companions (far more often for Bass, Mega Man only did it in 6 and 7).
** Soul Unison ([=DoubleSoul=]) in ''VideoGame/MegaManBattleNetwork''. It allows [=MegaMan.EXE=] to (composite) fuse with other Navis and gain some of their abilities.
** A special type of fusion occurs at the end of ''Battle Network 3'' when [[spoiler:Lan digitizes himself and merges with Mega Man to boost their response time.]] This eventually allows synchronization in subsequent games: when [=MegaMan.EXE=] scores a counter hit or is performing well, he becomes more powerful as a result of being "in sync" with Lan. But when he performs badly, he becomes more vulnerable as a result of being "out of sync".
*** Taken further in ''Battle Network 6'', where Megaman can use 'Beast Out' to (Composite) fuse with the Cyber Beast he has [[SealedInsideAPersonShapedCan sealed inside of him]], which also have a touch of Two in One Body as if Megaman is mentally exhausted, he can make one last pull, but temporarially loses himself to the Beast's power, and afterwards is left [[HeroicRedRingOfDeath fatally weakened]], or take the characteristics of an allied Navi (another composite), or reap the benefits of being "In Sync" with Lan (see above). And yes, you can have ''[[UpToEleven two of these at once]]''; sadly you can't be in "FullSync" and in a "Cross"(The Navi Fusion) at the same time, making Megaman absurdly powerful with the right combination of chips and programs.
** In ''VideoGame/MegaManStarForce'', the hero(es) use(s) a combo composite/switcher. Geo lives his life normally until the baddies attack, and then he turns into the "Mega Man" of the series, which involves fusing him with [[EnergyBeings energy being]] alien Omega-Xis.
*** He can also take the powers of other EnergyBeings to gain additional powers. It's even possible to have what could be considered a four-way fusion in the third game.
** ''VideoGame/MegaManX'' had a few characters who could join together as Composites; for example, Bit and Byte of ''X3,'' who become Godkarmamachine O Inary.
** ''VideoGame/MegaManZX'' has Biometals (Livemetals in the Japanese version), [[spoiler:which contain the souls of characters from ''VideoGame/MegaManZero'' and ''X'']]. The Biometals act as a Power Booster for humans and Reploids, turning them into "Mega Men" and granting them armored forms and abilities.
*** This Power Boosting system ''also'' has a Composite function; once the player finds both the Model X and Model Z Biometals, they can fuse with ''both'' at the same time to become Model ZX in what's called Double Megamerging. The titular transformation is only one of the six Double Megamerges (out of seven forms). (In the sequel, the player only has a single Biometal--Model A--that can copy the forms of other characters and Biometals without actually fusing with them).
* Every ''VideoGame/GoldenSun'' game ends with one of these as the final boss.
** The Fusion Dragon is a fusion of Saturos and Menardi.
** The Doom Dragon uses [[spoiler:Felix's parents and Isaac's dad. The player character shows remarkably little grief over it... Must be a HeroicMime thing. ]]
** The Chaos Chimera uses [[spoiler:Blados, Chalis, and the Chaos Hound as its components. TearJerker ensues as the latter turns out to be Volechek, and forcibly fights his sister and her companions again.]]
* In ''VideoGame/{{Starcraft}}'', two Protoss Templars can fuse into a single, ultra-powerful 'Archon' unit. It is a one-way process, and falls outside the three main types, since the brutal martial prowess of the Archon is quite different from the casting abilities possessed by the Templars. It's explained that, while Templar are very powerful with directed psychic abilities, Archons are the embodiment of raw psychic energy.
** The process is inverted by the martially-deadly Dark Templars that can merge to form a Dark Archon - which have a few ''very'' powerful "spells", but are completely useless in battle when they're low on mana.
** In ''Starcraft 2'', both the Dark Archons and the announced Twilight Archons were ditched and now any combination of templars results in a conventional Archon. The InUniverse reason being that the Dark Archons are the result of a DangerousForbiddenTechnique and far too powerful (one by the name of Ulrezaj goes nuts and is a big-time villain in the novels).
** The third expansion pack features Archon Mode, where two players run the same base and army.
* In ''VideoGame/SoulNomadAndTheWorldEaters'', the main character is the 'victim' of a botched DemonicPossession by OmnicidalManiac ex-BigBad Gig, which ends with the two SharingABody and Gig effectively becoming the main character's Power Booster on a permanent basis. It has the side effects that Gig isn't exactly [[DeadpanSnarker the most pleasant being to coexist with]]--and that [[PhlebotinumOverload drawing too much on his power]] will complete the possession to a manner more to his liking.
* In all the ''Franchise/{{Disgaea}}'' games, monster-type enemies can be merged by throwing them together--effectively a Power Booster, in that the fused being is the highest-leveled component monster with a boost in levels equal to the level of the weaker monster. ''VideoGame/{{Disgaea 3|AbsenceOfJustice}}'' also had the Magichange ability, which enables a monster to temporarily transform into a weapon for a human character, which enters into this trope mainly for those that turn into Fist-type weapons. (In all cases, the Magichanged monster provides both its main ability, and a percentage of its stats, to the wielder--but for most non-Fist versions, it more closely resembles an EmpathicWeapon.)
** Expanded on in ''VideoGame/{{Disgaea 4|A Promise Unforgotten}}'', where a monster can do a Fusion Dance with another one to supersize it, giving it increased stats across the board, and an increased range/radius on its attacks, among other things. It can still magichange in this state, as well, which gives a humanoid a ridiculously huge weapon that increases the range and radius of all ''their'' skills, ontop of the usual magichange benefits.
* In ''VideoGame/DragonQuestMonsters'', you breed {{Mon}}s together, the results of which are frequently a Fusion--especially when dealing with the Slime. For example, breeding a Slime (looks like a blue hershey's kiss) and a Golem (looks like a man made out of bricks) gets you a Rockslime, which looks like a Hershey's kiss made out of Bricks.
** Later localizations {{Enforced}} this trope by [[DubNameChange renaming this mechanic]] to synthesis, possibly because they wanted to avoid people thinking about the details on just how the copulation happens.
* In ''[[VideoGame/{{Boktai}} Lunar Knights]]'', Lucian and Aaron can merge with the dark and light terrenials, respectively, to enter a more powerful form, although it has a fairly short duration.
* In ''VideoGame/{{Persona 3}}'', the Main Character can create new Personae by fusing two or more existing Personae together. The new Persona can inherit attacks from any or all of its "parents" (including some that it wouldn't learn naturally).
** The original ''VideoGame/{{Persona}}'' allows the main character to do something similar, but using cards containing the essence of demons.
** Most of the ''other'' games in the ''Franchise/ShinMegamiTensei'' series let you fuse demons directly; in the continuity comprising ''1'', ''2'', ''If...'' and ''Imagine'', it's AllThereInTheManual (and visually explicit in ''Imagine'') that this effectively kills the original demons in the process.
*** In ''VideoGame/ShinMegamiTenseiIIINocturne'', there are standard fusions and "sacrifice fusions." Entering a certain door with either the first pixie who joined you or a demon made by fusing her [[spoiler:will cause that demon to transform back into the original pixie with boosted stats and powers. Using the pixie as a sacrifice will not let you trigger the scene,]] suggesting that using a demon as a sacrifice will kill them, but regular fusion, not so much.
** In ''VideoGame/ShinMegamiTenseiII'', it is explained that Satan is the result of a fusion between the demon Seth and a specific human. It is later revealed that the human is [[spoiler:your ally Zayin. You cannot stop the fusion, and on the Law route, you'll want the fusion to happen.]]
** Rather brutally explored in ''VideoGame/ShinMegamiTenseiStrangeJourney'': [[spoiler:Jack's Squad, who didn't get the Demon Fusion program, are trying to work out the methods themselves... through horrible experiments on captive demons. (One captive begs for the return of its hands and feet.) They're trying to fuse ''humans'' with the demons, and judging by the hideous demons you fight in their HQ, the results are not anything good. And then there's what happens with Jimenez...]]
** In ''VideoGame/ShinMegamiTenseiIV'', [[spoiler:Jonathan fuses with the Archangels to form Merkabah. Walter also fuses with Lucifer, but this only restores Lucifer's true powers]]. In ''VideoGame/ShinMegamiTenseiIVApocalypse'', two major instances occur near the end of the game: [[spoiler:Krishna fuses with Flynn to become Vishnuflynn, and Merkabah and Lucifer refuse to become Satan]].
** ''VideoGame/ShinMegamiTenseiV'' will once again feature the demon fusion mechanic, as usual for the series.
** In ''VideoGame/DigitalDevilSaga'', [[spoiler:the lead male and female, Serph and Sera, fuse into one ultimate being named Seraph; while the result is mostly controlled by Sera due to Serph being a HeroicMime, it is stated their minds would eventually merge the same way]]. This is explicitly a reference to the Hindu religion, where the perfect being is said to be a fusion of both the female and male aspect. An example in Hinduism is Ardha, the fusion of the Shiva and his wife Parvati. This may not apply to all sects of Hinduism though; being OlderThanDirt, Hinduism has so many different sects and interpretations that your head will explode trying to figure out the contradictions.
** ''VideoGame/DevilSurvivor'' heavily features the usual series mainstay of fusing demons together, but also has a rather bizarre offhand reference when fusing the demon Lilith with another.... wherein she will pout and state that she would much rather try fusing with ''you.'' It's unclear whether she was just going for a little DoubleEntendre, or if this is actually possible in the game's universe.
* In ''VideoGame/StarControl II'', the Mmrnmhrm (a mechanical sapient race) and the Chenjesu (a crystalline race) are eventually discovered to have merged into a gestalt composite race, the Chmmr. Once they join your alliance, they are able to provide you some [[GameBreaker small assistance]] with your combat capabilities.
* Masa and Mune in ''VideoGame/ChronoTrigger'' fuse after getting their individual butts kicked while testing potentials to wield the Masamune. The result is pretty... chubby, for some reason.
** Obviously, [[Anime/DragonBallZ their fingertips were misaligned]].
*** Makes you wonder how powerful they'd be if they got the fusion dance right.
** Dream, or Doreen, merges with them in ''VideoGame/ChronoCross''. They all inhabit the "Grand Dream," or [[{{Woolseyism}} Mastermune]].
** The Time Devourer of ''VideoGame/ChronoCross'' is a Composite fusion of [[spoiler:Lavos and Schala, whose disapproval at the notion of Might Makes Right Evolutionary theory has her tell the entire space-time continuum/multiverse that it had better find some other way of defeating Lavos, or she'll erase everything. Granted, she's affected by Lavos' destructive intent.]]
*** We also see Harle, the [[SixthRanger Seventh Dragon]], doing the Fusion Dance with the other six dragons.
* Some Slimes in the ''VideoGame/DragonQuest'' series can band together to form a King Slime. You can tell right away that they're different from garden-variety Slimes because they take slightly more damage than normal, and they always call for help.
* For most of ''VideoGame/IllusionOfGaia'', Will is a Switcher: he lives the normal life, but he can take the form of the Dark Knight Freedan or the Light Knight Shadow (don't ask) when he explores dungeons. At the very end of the game, however, [[spoiler: he performs a Composite fusion with Kara, another fully evolved human and the new Light Knight, to become a super-powered version of Shadow, complete with a new "Firebird" attack.]]
* The main premise of the old NES game ''VideoGame/MonsterParty'' was that Mark, a kid with a baseball bat, and Bert, a flying gargoyle dragon thing, fused together to fight monsters in the Bert's home, the Dark World. Most of the game is played as Mark, who only transforms to Bert when he [[TransformationTrinket scoffs down]] [[PowerUp pills]] that are [[BlatantItemPlacement just lying around]]. It is a mystery why Bert needed Mark, since the Bert form is entirely superior.
* ''VideoGame/{{Marathon}}'' gives us an example with two non-physical characters. Near the end of ''Infinity'', the player character merges his [[VoiceWithAnInternetConnection AI With An Internet Connection]] Durandal with the ancient alien AI Thoth. The resulting character is a Composite of the two, although thankfully he doesn't seem to posess some of the traits of [[MagnificentBastard Dura]][[JerkAss ndal]] or [[GratuitousIambicPentameter Thoth]].
* ''Franchise/KingdomHearts'':
** ''VideoGame/KingdomHeartsII'', Sora can use his party members as Power Boosters using the Drive System. For example, Sora's DualWielding [[http://kingdomhearts.wikia.com/wiki/Valor_Form Valor Form]] involves absorbing Goofy. Absorbing Donald turns him into the magic-oriented Wisdom Form. Absorbing both active party members can turn him into Master or, later on, Final Form.
** In ''[[VideoGame/KingdomHeartsDreamDropDistance Dream Drop Distance]]'', Riku can use [[{{Mons}} Dream Eaters]] as a Power Booster and enter various "Link Styles". [[spoiler:The fact that Riku can do this and Sora can't is {{Foreshadowing}} that Riku ''is'' a Dream Eater in this game.]]
* ''Franchise/TheLegendOfZelda'':
** In ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', the Twinrova witches merge into a composite form for the second half of their BossBattle.
** ''VideoGame/TheLegendOfZeldaALinkBetweenWorlds'' [[spoiler: the final boss]] is a fusion of [[spoiler: Ganon and Yuga.]]
* In the ''Videogame/{{Touhou}}'' series, Utsuho Reiuji (a hell raven youkai) received a Power Booster of sorts by eating the body of a yatagarasu (a divine sun crow), [[spoiler: as directed by another goddess, Kanako Yasaka]]. As a result, she now has power over nuclear fission and fusion, and her body has changed somewhat as well - she now has the yatagarasu's third eye on her chest, a control rod (the "yatagarasu's third leg") on her arm, and "feet of fission and fusion".
--> '''Utsuho Reiuji:''' The ultimate energy is nuclear fusion power! Won't you fuse with me?
** The Touhou fandom seems to like making Utsuho ''herself'' an unwitting Power Booster for others, such as [[http://i833.photobucket.com/albums/zz253/NoNumbersPlz/safebooruomaemonapixiv566453.jpg?1282419312 Mokou Fujiwara]], [[http://i833.photobucket.com/albums/zz253/NoNumbersPlz/danboorushushio394062.jpg?1282419311 Nitori Kawashiro]], and [[http://i833.photobucket.com/albums/zz253/NoNumbersPlz/gelboorufalketto833215.jpg?1282419313 Tenshi Hinanai]]. Becoming a part of someone else, rather than them becoming a part of her, is probably not what Utsuho had in mind ...
** And then there's Utsuho's [[http://www.youtube.com/watch?v=xOKfaD7cSdE actual Fusion Dance.]]
* For the FinalBoss of ''VideoGame/TombRaiderLegend'', Amanda merges with the Unknown Entity.
* This is how each of the power-ups work in ''VideoGame/SonicColors'' Sonic merges with the Wisp to gain its powers. They reappeared in ''VideoGame/SonicLostWorld'', filling the same purpose as they did in ''Colors''. However, in ''VideoGame/SonicForces'', they are instead being fused with a gadget called a Wispon.
* The final boss of ''[[VideoGame/TronTwoPointOh Tron 2.0]]'' is a monster formed from the three main antagonists after their botched attempt to digitalize themselves.
* The entire point of ''VideoGame/{{Trine}}'' is that the three main heroes become a Switcher single main hero due to the titular artifact.
* In ''VideoGame/FreedomForce'', a blind female witness and an idealistic rookie cop get hit by [[SuperSerum Energy X]] and merge into a switchable superhero named Law and Order. The witness becomes Law, who is appropriately blind, and is armed with a sword. The cop becomes Order and is armed with a massive gavel. Only one can exist at any given time.
* Similar to the ''VideoGame/{{Starcraft}}'' example, the Viron units in ''VideoGame/GroundControl II'' are able to merge into other units, although the new units are not necessarily more powerful. Unlike ''Starcraft'', this process is reversible, making Virons pretty versatile.
* In ''[[VideoGame/KikiKaiKai Pocky & Rocky 2]]'', Pocky can use Magic to fuse with her partners as a Power Booster (though there are a couple she just rides instead).
* In ''Franchise/DragonAge'' non-demonic spirits who possess a mortal seem to be Switcher/incomplete Composite types. They're always present in mind, and their personalities do influence the other, but the spirit can also take over. In Wynne's case, the spirit of Faith only takes over briefly to protect her with healing and buffs. Anders is a gifted healer who switches mode to deal the more powerful offensive magic that only Vengeance is capable of. Sometimes Vengeance appears to seize control against Anders' will.
* In the ''VideoGame/{{Fallout}}'' series, creatures called Centaurs are made by putting more than one creature into a vat of the Forced Evolutionary Virus. The results are [[BodyHorror not pretty]].
* In ''VideoGame/LittleFighter2'', [[PlayingWithFire Firen]] and [[AnIcePerson Freeze]] can merge into the super-powered [[YinYangBomb Firzen]], but only one player gets to control him, so the other has to sit out until they decombine.
* The gameplay of ''VideoGame/{{Illusions}}'' involves merging and splitting [[MegaMicrobes amoeba-like creatures]] called Gleebs.
* The obscure 1989 [[Creator/BandaiNamcoEntertainment Namco]] shmup ''Dangerous Seed'' has an example in the last three bosses before the final stage. Allowing the st. 5 or st. 6 bosses to escape leads you to a different planetary orbit, with a boss consisting of a mashup of the boss who escaped and the boss who you'd normally fight there. What makes this really interesting is that if you allow Multi-Squid (st. 5) to escape, then let its fusion with Shark-Mouth, Monster-Head, escape the next boss fight, the new seventh boss, Ultimate-Tiger, is a Monster-Head/Twin-Claw fusion. In other words, it's ''three'' bosses fused together. Have fun!
* Salazar in ''VideoGame/ResidentEvil4'' fuses with the Queen Plaga and a Verdugo to form the Chapter 4 boss.
* ''Franchise/{{Pokemon}}'':
** From ''VideoGame/PokemonBlack2AndWhite2'' onwards, Kyurem can become Black Kyurem by merging with Zekrom, and become White Kyurem by merging with Zekrom's other half, Reshiram. It can do this due to being a byproduct of Zekrom and Reshiram splitting from their original form. The DNA Splicers let the player do this (and reverse the process) at any time, so long as both are in their party.
** Zygarde is made up of several Zygarde Cores and many more Zygarde Cells. While it remains in its 50% Forme, it's able to merge with all its components [[GodzillaThreshold in dire situations]] to achieve its Complete Forme.
** A rare human example in ''VideoGame/PokemonSunAndMoon'' can be seen with [[spoiler:Lusamine and Nihilego during the climax. Lusamine willingly fuses herself with Nihilego in order to defeat the main character once and for all. Upon her defeat, she tries to personally kill her daughter, Lillie, but Solgaleo/Lunala (depending on the version) arrives and defuses the pair.]]
** Another (much more bizarre) human example occurs in ''[[VideoGame/PokemonRubyAndSapphire Omega Ruby and Alpha Sapphire]]''. [[spoiler:In an AllYourPowersCombined version, the guys who hand out O-Powers in Mauville City perform an event where they circle around another man who lives in an apartment nearby and merge with him one by one, eventually forming Mr. Bonding from ''VideoGame/PokemonXAndY''.]]
** In ''VideoGame/PokemonUltraSunAndUltraMoon'', Necrozma can perform a GrandTheftMe on Solgaleo and Lunala to form Dusk Mane Necrozma and Dawn Wings Necrozma, turning the former into some form of armor on the latter.
* [[UnfortunateNames Kinky]] of ''VideoGame/PacMan Arrangement'' has the Power Booster form of this ability; being able to merge with any of the four standard ghosts and cause them to double in size and gain a special ability. They're also worth double the points when you eat them.
* Happens a lot in [[Franchise/SuperMarioBros Mario]] [[RolePlayingGame RPGs]]. A lot of those also contain DemonicPossession, but the fusing aspect is still there. Often they're final bosses:
** Both ''VideoGame/PaperMarioTheThousandYearDoor'' and ''VideoGame/PaperMarioStickerStar'' have Boos joining themselves together to form a bigger, meaner Atomic/Big Boo.
*** The final boss' first form from ''The Thousand-Year Door'' is a fusion between [[spoiler: Princess Peach and the Shadow Queen]].
*** Do not forget the Smorgs.
** ''VideoGame/SuperPaperMario'', the final boss is a fusion between [[spoiler: Dimentio and Luigi]], having features from both characters and powered by the Chaos Heart.
** ''VideoGame/MarioAndLuigiSuperstarSaga'' has Cackletta taking over Bowser's body after being defeated midway through the game, turning into Bowletta, which is Bowser's body showcasing some of Cackletta's features (including [[FanDisservice boobs]]).
** In ''VideoGame/MarioAndLuigiDreamTeam'', when battling in the Dream World, Mario and Dreamy Luigi perform the Power Booster version of this, with Dreamy Luigi becoming a green aura that powers Mario up.
** ''VideoGame/MarioAndLuigiPaperJam'', the final boss is a fusion of both [[spoiler: Bowser and Paper Bowser called Shiny Robo Bowser]]. It also has a few {{Mooks}} mixed in there.
* The [[GameMod ROM hack]] ''VideoGame/BrutalMario'' has the seven Koopalings merging together, a {{homage}} to the 7 Heroes from ''VideoGame/RomancingSaGa2''.
* The TrueFinalBoss in ''[[VideoGame/{{Something}} Something Else]]'' is [[spoiler:a merger of the Evil Guy and Ballser.]]
* In ''VideoGame/{{Robopon}}'', the three Zero cyborgs in Robopon 2 do this to attack Cody one more time as he leaves the Pond Garden, creating the multi-faced abomination called Insector.
* ''VideoGame/YuGiOhReshefOfDestruction'' inverts this with Dark Flare Knight. In the real life game, he's a fusion of Dark Magician and Flame Swordsman. In this game, when the Dark Flare Knight is send to the graveyard, it [[CameBackStrong Comes Back Strong]] as Mirage Knight, and when the turn ends, he's de-fused into his original two forms. The game itself has no Fusion Monsters.
* In ''VideoGame/PinballQuest,'' the main enemies of the first table are a set of animated skeletons who combine to form a [[KingMook giant skeleton]].
* ''VideoGame/TalesOfZestiria'' Out of the 6 fighters, it lets two characters fuse. Gaining new powerful attacks and a Mystic Arte to go with the new form. This process is called Kamui in Japanese and Armatization in English.
** ''VideoGame/TalesOfBerseria'' also has armatization, in a much more unstable and experimental fashion as used by the antagonists. It still gives a human the powers and appearance of a malak counterpart, but [[spoiler:it's more like forcing the malak into the human's body, and can kill the user if used improperly. Most of the {{Mook}} exorcists end up involuntarily ''self-destructing'' after using it.]] There's also the part where [[spoiler:Teresa lets a therion fuse with her so she can attack the party.]]
* Done unwillingly by [[Franchise/{{Batman}} Robin]], [[Film/LordOfTheRings Frodo]], and [[WesternAnimation/TheLegoMovie Metalbeard]] in ''VideoGames/LegoDimensions'' to form [[RealityWarper The Tri]].
* ''VideoGame/CapellasPromise'' has the Mother superweapon, whose sole purpose is to combine people and monsters into monstrous soldiers known as Hutes. Worse yet, she can fuse Hutes into even stronger Hutes. [[spoiler:The BigBad of the story, Zanara, ends up fusing with her to create an intelligent but insane war machine.]]
* Several crossover games have merged bosses made of up of two characters from the respective franchises being featured:
** ''VideoGame/MortalKombatVsDCUniverse'' has Dark Khan, a combination of Shao Khan from ''Franchise/MortalKombat'' and Comicbook/{{Darkseid}} from DC. It happened as a result of Superman blasting Darkseid with his EyeBeams, when the villain was stepping through a Boom Tube, at the same moment as Raiden was blasting Shao Khan entering a portal with his lightning.
** ''VideoGame/CapcomVsSNK2MarkOfTheMillennium'' has a variant. Just before the final boss fight, players are treated to a cut scene where Akuma from ''Franchise/StreetFighter'' faces off against Rugal Bernstein from ''VideoGame/TheKingOfFighters''. If Rugal wins, he absorbs Akuma's Satsui no Hado and becomes God Rugal, and if Akuma wins, he absorbs Rugal's Orochi power and becomes Shin Akuma.
** In ''VideoGame/MarvelVsCapcomInfinite'', ComicBook/{{Ultron}} and [[VideoGame/MegaManX Sigma]] use the Infinity Gems to become [[BreadEggsBreadedEggs Ultron-Sigma]].
* In ''VideoGame/{{Cuphead}}'', the two BashBrothers, Ribby and Croaks, perform their dance during the final phase of their fight, where one swallows the other and they turn into a huge slot machine.
* In ''VideoGame/EternalFighterZero'', [[VisualNovel/{{Kanon}} Mai]] [[IaijutsuPractitioner Kawasumi]] and [[CuteGhostGirl her ghost partner ]](Also called Mai) can do a '''Power Booster''' version for their Final Memory, called "Awakening": The ghost partner merges with Mai, who gets a boost in offense and speed for several seconds, giving her access to more combos and other powerful moves.

[[folder: Visual Novels]]
* In ''VisualNovel/{{SC2VN}}'', Stunt controls one side's units while Reva handles the economy, just like in [[VideoGame/StarcraftII Starcraft 2's]] archon mode above. Stunt {{lampshade|Hanging}}s it.

[[folder: Web Animation]]
* ''Machinima/RedVsBlue'' explores multiple examples. Project Freelancer was a military experiment that implanted AI partners in the minds of their top soldiers, intending to get the Power Booster result. However, some Agents instead became Composites as the personalities and desires of the human and AI became intermingled. And in at least one case, a powerful and dangerous AI is able to hide within a host as a Switcher, eventually taking over the body to wreck some havoc. Some [=AIs=] even adopt a new title based on a fusion between their partner's name and their original Greek letter designation, such as O'Malley, a fusion of the Omega AI and its host Allison.
* ''EskimoBob'' In the special, "Return of the girl", Bob and Alfonzo (or rather their clones) can do the Composite example by doing the animation the originals do in the beginning of each episode. The Penguin and Sams can do the power booster example with the help of the alien business men. And The Fish in a space ship can do this with the Fishticons.
* TheMovie of ''WebAnimation/TVTomeAdventures'' ends with [[spoiler: Alpha and Zetto merging their characters to make the far stronger "[=AlphaZet=]."]] Bizarrely, the merged form doesn't merge their characteristics at all, simply having the left side of the body look like one character and the right side looking like the other. Both of them have equal control over the resultant body, and have to work in perfect sync. [[spoiler: This is never mentioned again until the season three finale where, in a subversion of the usual trend of the movie having no effect on the series as a whole, they use the merged form ''again.'']]
* In the ''Franchise/SonicTheHedgehog'' fanimation ''WebAnimation/NazoUnleashed'', [[spoiler:Sonic and Shadow fuse into Shadic after assuming their [[VideoGame/Sonic3AndKnuckles Hyper forms]].]]
* Done by Dewey and Louie in ''WebAnimation/{{Ducktalez}} 3'', but this ends up being their undoing as they argue over their fused name.
* ''WebAnimation/DSBTInsaniT'': At one point, Darkness Duck uses Darkness Snake's headless body as a replacement for his string. He becomes much stronger in the process.

[[folder: Webcomics]]
* In the animated webcomic ''Webcomic/KidRadd'', the DamselInDistress love-interest Sheena (who subverts her assigned role at every turn) winds up merging with what was, essentially, a dying, future version of herself. In her normal form, she's an NPC--[[InvulnerableCivilians Invulnerable Civilian]], but incapable of attacking... her future self is a Hero, however, and thus capable of powerful attacks, while sacrificing the inherent invulnerability of the NPC. Thus, this is a Switcher type.
** ''Kid Radd'' also contains a structure designed with LostTechnology that causes Composite fusions of characters. This is crucial to the villain's EvilPlan:[[spoiler: to have either [[TheDragon Crystal]] or Radd's group gather an army of the most powerful sprites and have them fuse together, then assimilate their fused form as a Power Booster]]. It would have worked, [[spoiler: if only Crystal fused herself with an NPC]].
** There is also Gnarl and Kobayashi, two minor villains who end up [[spoiler:accidentally fusing themselves by the same method as the BigBad. They are eventually separated, but they learn to fuse themselves again whenever necessary, becoming the Composite.]]
*** Also resulting in one of the better lines from the comic: [[spoiler:I'm... we. I mean, us are me.]]
* In ''Webcomic/AnsemRetort'', [[spoiler:Axel and Zexion were somehow able to fuse into ''UsefulNotes/AndrewJackson'']].
-->[[spoiler:'''Zexion''']]: You're a killer and I'm a politician. [[BrickJoke Fusing us would just turn us into]] [[spoiler:Andrew Jackson]]!
* Parodied in ''Webcomic/ProblemSleuth'', in which Ace Dick uses Belly Of The Whale to absorb his alternate form clones, Zombie Ace Dick and Fiesta Ace Dick, gaining their powers. This results in Ace Dick becoming [[spoiler:himself, since he doesn't have the imagination to come up with a suitable combined form.]]
* In ''Webcomic/{{Jack|DavidHopkins}}'' the twin demonic personifications of Gluttony often share the same body with one in control of it and the other's face sticking out of the crotch, switching seemingly at random.
* Near the end of ''Webcomic/{{Fite}}'', [[spoiler:Guz is absorbed into Lucco. It's mostly a Power Booster type, but there's a little Composite, as Lucco has Guz's eyes after the fusion]].
* Parodied in ''Webcomic/{{Paranatural}}'' with the "friendship fusion", [[http://paranatural.net/chapter-1-page-24/ which is really just three kids standing on each other's shoulders]].
* In ''Webcomic/{{Homestuck}}'', during Act 6, Gamzee forcibly prototypes a Kernelsprite with the bodies of [[spoiler:Tavros and Vriska]], creating the unholy abomination known as [[spoiler:Tavrisprite]]. He later does the same with [[spoiler:Erisolsprite]] and [[spoiler:Fefetasprite]].
** Other sprites have elements of this, due to being prototyped twice.
** [[spoiler:Lord English]] turns out to essentially be a fusion of [[spoiler:Equius, Dirk's autoresponder, half of Gamzee, and of course, Caliborn.]] By extension, this also applies to [[spoiler:Doc Scratch]]. [[spoiler:Lil Cal]] is the SoulJar that allowed all of this to happen.
* In ''Webcomic/{{Redeem}}'', every character can fuse himself with another via magic using the Composite Modus Operandi.
* In ''Webcomic/ShotgunShuffle'', while shopping for toys on Black Friday, Ellie's second-oldest sister Tarragon and her youngest sister Pumpkin randomly fuse together.
-->'''Ellie:''' They seemed to have gotten into a huge mess and... "combined their powers."\\
'''Ginger:''' They formed Captain Planet?\\
'''Ellie:''' I think it's called ''Tarrakin''.\\
'''Pumpagon:''' ''We are Pumpagon!''
* In ''Webcomic/{{Magience}}'', several [[BlobMonster slimes]] merge into a giant Slime Golem.
* In ''Webcomic/{{Drowtales}}'', this is one way to make the "Taint" safe. By becoming one, truly one, with the demon it will no longer be able to harm you. Given that this requires merging with it on the [[SplitPersonalityMerge spiritual and mental level]] as well, it's still pretty risky.
* This is the premise behind the "Divine Union" in ''Webcomic/{{Holystone}}''. Mortals already share their bodies with gods as a matter of day-to-day life, but the Union combines them into one more powerful creature.
* In the Webcomic/{{Bravoman}} webcomic the heroes discover that by destablising Anti Bravoman's anti particles (by [[ButtMonkey beating him up]]) the resulting vortex fuses them into Bravomaster: a powerful and completely serious giant. When repeating the fusion at the end of the series Waya Hime joins in which gives the resulting fusion ninja abilities but doesn't effect the personality.
* In Extra Fabulous Comics #212, a piece of cheese and a burger try the trope. [[http://extrafabulouscomics.com/comic/212/ It turns worse than you would expect]].
* Several companies from ''Webcomic/{{Consolers}}'', like Square Enix and Koei Tecmo, are "merges" - two companies merged together into one character. When companies merge with each other, it turns them into one character with combined traits and looks from both of them.
* Changelings in ''Webcomic/CharbyTheVampirate'' gain new bodies by [[BodyHorror merging with]] and [[KillAndReplace replacing the originals]].
* During the Inert Vessel arc of ''Webcomic/AwfulHospital'', when [[http://www.bogleech.com/awfulhospital/climax-balmerdolphind7.png the Dolphin (still partially embedded in the mangled corpse of Doctor Balmer)]] attempts to follow the Exvironator into the pool of embalming fluid, the exvironator-contaminated Flush turns it and Balmer into [[http://www.bogleech.com/awfulhospital/ascendedbalmer.png Balphin]].
** Before that, Fern's allies [[http://www.bogleech.com/awfulhospital/407.html merge]] in a [[ShoutOut direct reference]] to ''Westernanimation/StevenUniverse''.

[[folder:Web Original]]
* Word of god states that this will happen with Trayen and previous osmovessels [[WesternAnimation/AvatarTheLastAirbender Avatar]] style in series 3 of ''Literature/{{Phaeton}}''.
* ''Website/GaiaOnline'' had a subplot where Gino had, unbeknownst to everybody (possibly including himself), fused with his "[[NoOneCouldSurviveThat dead]]" father, making him into the badass superhero The Masque at the expense of making him unpredictable and violent, particularly towards Ian (who felt likewise about him/them). The reveal came when the local MadScientist injected him/them with a catalyst that caused them to split, ending that plotline and setting up the next with an EarthShatteringKaboom.
* In Website/DeviantArt, this is quite common. Most of the fusions are between females however. If the fusion is between a male and a female, expect the result to be female or female-ish, but it's a rare occasion to find it ending with a male result, especially if the result is rather muscular.
* As part of a RunningGag on ''WebVideo/GameGrumps'', the Grumps [[https://www.youtube.com/watch?v=7hPeDvXVKFQ chronically confuse]] WebVideo/ProJared with Jirard WebVideo/TheCompletionist, and at one point make a joke of a possible composite fusion of the two, dubbing the result "[=ProJirard=] The Finishist." By the time that the Grumpcade episode for ''VideoGame/TeenageMutantNinjaTurtlesTurtlesInTime'' came out, they got both Jared and Jirard to appear simultaneously on the show, and [[https://www.youtube.com/watch?v=SNG1-EnThF4 made a joke introduction of the two fusing into ProJirard the Finishist,]] ''Anime/DragonBallZ'' style. They also make references to the character by having Jirard and Jared [[VoiceOfTheLegion say the same things at the same time]].
* Lanipator and Kirran of Creator/TeamFourStar can do the fusion dance to become Lirran. See [[https://youtu.be/anIwlZ0_ouI?list=PLAD5jdjmBF51jHgIkEP7mx8muIlzI4RWa&t=580 Xenoverse 18]], [[https://youtu.be/YEiynJcqCuU?t=885 Drunklstiltskin 3]] and [[http://way2thedawn.deviantart.com/art/Lirran-549630335 some fanart]].
* ''Blog/ThingsMrWelchIsNoLongerAllowedToDoInAnRPG'':
-->1462. Dwarves do not have the racial ability to merge into a larger, more powerful dwarf.
* ''Literature/WhateleyUniverse'':
** The twins Phobos and Deimos sometimes fuse into a more powerful being called Fury that has the heads and limbs and tails of both of them, along with a fear aura so powerful that it rips up reality around itself. Later on, [[spoiler:Phobos dies, Fury is created by fusion with others]].
** Gog and Magog can fuse into a larger being called Gogmaggog.

[[folder: Western Animation]]
* The 2000s ''[[WesternAnimation/TeenageMutantNinjaTurtles2003 Teenage Mutant Ninja Turtles]]'' animated series features an involuntary fusion of two villains, Drako and The Ultimate Ninja, into a powerful but terror-inducing form.
* ''Franchise/{{Transformers}}'' ''loves'' this. You've got the gestalts like Devastator; Optimus Prime and, well, ''lots'' of things; and the "Spark of Combination" pairs.
** Given that they're MechanicalLifeforms, they kinda toe the line between this and CombiningMecha.
** Groups like the Constructicons or Aerialbots are CombiningMecha. The 'Spark of Combination' from Energon would count as this trope, as would Optimus Prime's combined super modes from Cybertron as Composite/Powered Up combinations.
** This can vary by continuity. Combiners like Devastator and Superion are usually a Composite. The component 'bots go through a mental fusion to create the gestalts mind and personality. The more in sync a team is, the more mentally stable the resulting gestalt is.
* An episode of ''[[WesternAnimation/{{Superfriends}} The Superfriends]]'' had Green Lantern using his ring to fuse himself and Superman to deal with the day's NegativeSpaceWedgie.
* The second SeasonFinale/last episode ever of ''WesternAnimation/LegionOfSuperheroes'' featured a Composite of Franchise/{{Superman}} and his clone-from-the-future (er, ''further'' into the future), Superman X. It was accomplished with Saturn Girl's PsychicPowers, as it was technically a BattleInTheCenterOfTheMind.
* ''WesternAnimation/AvatarTheLastAirbender'' and ''WesternAnimation/TheLegendOfKorra'':
** The Avatar State is a Composite and Power Booster at once, with a bit of Switcher mixed in. It allows the current Avatar to harness the skills and knowledge of Raava the Avatar Spirit as well as all the previous Avatars. In moments of extreme danger or emotional distress, the Avatar State awakens by itself, and the current Avatar has no control until the danger/angst has passed. Additionally, in certain circumstances, the Avatar can take the ''physical'' form of a previous avatar. Avatar Aang was able to turn into Avatar Roku while inside Roku's temple, and into Avatar Kyoshi while wearing Kyoshi's artifacts.
** Additionally, other forces can use Aang's body and Avatar State to their own ends, such as La the Ocean Spirit.
** While not actually resulting in a fusion, Book 3 had an episode where Aang and [[spoiler:Zuko]] perform a firebending "form" that very much resembled the ''DBZ'' fusion dance at several points and was called the "Dance of the Dragons." One humorous fanmade sketch shows [[http://street-angel.deviantart.com/art/ZukAang-Chapter-13-SPOILERS-73949169 the result of said fusion]]. This is likely a ShoutOut, since the show creators are anime fans.
** Dark spirits can also fuse with humans. For example, in ''WesternAnimation/TheLegendOfKorra'''s Book 2 finale, [[spoiler: [[BigBad Unalaq]] and [[TheAntiGod Vaatu]] merge to form the "[[TheAntichrist Dark Avatar]]."]] Also in this finale, [[spoiler:Avatar Korra reunites with a newly regenerated Raava (who had previously been destroyed by Vaatu) and starts the Avatar Cycle over again.]]
* In the short-lived ''WesternAnimation/MortalKombatDefendersOfTheRealm,'' Nightwolf was the team SmartGuy and seldom joined the others in battle, preferring to stay back with his pet wolf and man the computer systems. When important missions did require him to accompany the team, he would merge with the wolf as a Power Boost when kombat got thick and open a can of whoop-ass on the {{Mooks}}. It was quite awesome to see and helped to break the monotony of the show, though he only did it like three times over the course of the series.
* An episode of ''WesternAnimation/ReBoot'' had main villain viruses Megabyte and Hexadecimal merge (via a third component, a Web Virus) to make an even more powerful hybrid called Gigabyte, who is specifically said to have both Megabyte's strength and Hexadecimal's special powers.
** Season 4 revealed that this fusion was more of a recombination; Megabyte and Hexadecimal used to be a single virus, [[PunnyName Killabyte]], who upgraded into Gigabyte and then split into Megabyte and Hexadecimal shortly after being portaled into Mainframe.
** In Season 3, Bob performs a Power Booster. He [[spoiler: merges with his (damaged) keytool Glitch upon being reunited with it toward the end of the third season. This actually ends up causing problems for him in the fourth season, as the merge didn't quite work right due to Glitch's damaged state. It's mentioned that if he continues to use his Glitch powers he'll eventually die because of it. He manages to split from Glitch (though he decides to separate from Glitch because he believes he can win Dot's love that way, not because he's going to die!) a few episodes later, returning him to his original look. Glitch also returns, repaired and upgraded]].
* In ''WesternAnimation/{{Ben 10}}'', Ben unintentionally does the Mixed Form variant in "Dr. Animo and the Mutant Ray". Additionally, there was a promotion where Bandai sold Ben 10 toys that had codes. Typing two of the codes on the Bandai Ben 10 (now classic) website to see what two of Ben's aliens would look like fused together. With the absence of Grey matter and Ripjaws's codes, Stinkarms was the only form from the episode that could be recreated, though many fusions created separately could be made.
** Done on purpose in the {{crossover}} episode ''[[WesternAnimation/Ben10GeneratorRexHeroesUnited Ben 10[=/=]Generator Rex: Heroes United]]'', with Ben serving as a Power Booster for Rex. The background even showed a [[MotifMerger fused version of their logos]].
** A potential FutureBadass version of Ben as Ben 10,000 has invented the Biomnitrix, two Omnitrix gauntlets he can slam together to transform into fully functional Mixed Form fusions of his aliens.
* In the ''WesternAnimation/{{Gargoyles}}'' episode "Grief", a magic scroll fuses an avatar with Anubis, god of death. Pack member Jackal interrupts the ritual for it and combines with him, causing some prime terror in the process.
* In ''WesternAnimation/DannyPhantom'', [[FallenHero Dark Danny]] is the result of a fusion between [[spoiler:Danny and Vlad's ghost halves, with Danny ending up with complete control, but inheriting some of Vlad's traits, like the green skin, the pointy ears, [[BreadEggsMilkSquick and being evil]].]]
* Ramon De La Porta from ''WesternAnimation/KongTheAnimatedSeries'' frequently uses a device to merge various animals with himself to fight the eponymous gorilla. This has been utilized to create various monsters of mythology, including the griffin and manticore.
** Kong and the male protagonist would also merge as a Power Boost. Or rather a mental boost, the merge gives Kong a more rational mind to out-think and better handle his opponent.
* The Trix in the season 2 finale of ''WesternAnimation/WinxClub'' merge together into an even more powerful being.
* In the penultimate episode of the second season of ''[[WesternAnimation/JusticeLeague Justice League Unlimited]]'', "Panic in the Sky", [[spoiler:ComicBook/LexLuthor convinces ComicBook/{{Brainiac}} to merge with him. The resulting godlike being possesses all of Brainiac's power and knowledge combined with Luthor's ego and ambition.]]
* The animated movie ''WesternAnimation/TheGuardiansOfTheLostCode'', uses a combination the composite and power booster, with the "Warrior Form" between a human and a [[{{Mon}} brije]]: The fusion increases the human's physical strength and multiplies the brije's magical powers.
* In ''WesternAnimation/StevenUniverse'', any Gem is able to perform fusion by (literally) dancing. Pearl and Amethyst can fuse into the serene Opal, Garnet and Amethyst can fuse into the destructive Sugilite, Garnet and Pearl can fuse into the showy Sardonyx, and all three can combine to form Alexandrite; apparently any member of their species can combine with each other. Fusion is treated as a very ''intimate'' act based highly on the personalities on the gems involved.
** Whether the components gems' personalities fuse along with their forms seems to vary depending on the component gems and the product. [[spoiler: Garnet,]] Sardonyx, and Sugilite all demonstrate a merged personality. Malachite, Alexandrite, and Stevonnie on the other hand all demonstrate the individuals sharing the body, although Stevonnie seemed to go back and forth. It appears that the more in sync the component gems are the more the personality and identity merge, thus making the fusion more stable. Malachite's components hated each other, Alexandrite is too many people, and Stevonnie was just getting used to it. Opal is ambiguous, but given how she can barely maintain a physical fusion it's unlikely she has a singular identity. On the other hand, fusions with unique personalities can outright overwhelm the components, demonstrated with Sugilite [[spoiler:and hinted occasionally with Garnet]].
*** The dance actually isn't strictly necessary, it's a way of expressing oneself while also participating in a partnership. Fusion can naturally occur when physically close in a crisis, as the minds synchronize.
*** Jasper's fusions seem to work differently, her overpowering personality keeping the fusion together with her in sole control (or [[spoiler: Lapis turning the tables and overpowering her mentally]]).
** Steven can fuse, and his nature as both a gem and organic life somehow allows him to fuse with not only gems, but his friend Connie and hypothetically other humans. For a while he hadn't fused with anyone besides Connie, gem or human, but eventually he fuses with [[spoiler: Amethyst to form Smoky Quartz]].
** Fusions also tend to be large in comparison to the sum of their component Gems, as seen with Alexandrite [[http://vignette3.wikia.nocookie.net/steven-universe/images/a/a0/Alexandrite_Fusion_2.jpg/revision/latest?cb=20141108003219 here.]] [[spoiler: Stevonnie, Steven and Connie's fusion,]] and [[spoiler: Garnet, Ruby and Sapphire's fusion,]] are both taller than their original bodies, but this still applies considering their constituents are about the same size as Steven.
** "Keeping It Together" reveals that the Homeworld Gems have also attempted alternate methods of fusion dance, by way of [[spoiler: [[AndIMustScream forcibly fusing the gems themselves together, not just the physical forms]], and creating [[ArtificialZombie monstrous, screaming results]]]]. The test subjects in question were ''[[spoiler:[[CondemnedContestant fallen Crystal Gems from the war]]]]'' [[spoiler:which were incubating under the Kindergarten for at least 5,000 years]]. Garnet describes the results as a perversion of everything fusion stands for.
** "The Answer" reveals that traditionally on the Homeworld, Gems only fused with Gems of the same type (as seen when three Rubies fuse into one big Ruby). Fusion between two different types of Gems was seen as scandalous, and an affront to Homeworld's FantasticCasteSystem [[spoiler: as demonstrated when Sapphire and Ruby end up accidentally fusing together into Garnet for the first time, to the outrage of all the other Gems in Blue Diamond's court.]] Even then, gems of the same type only ever fused for combat, not really having time to explore how their fusions affected their personalities or their relationships with one another. Ruby only felt as though her fusion with the rest of her squad was just a bigger version of herself, despite her and the other rubies indeed having distinct personalities.
** Two big mostly-silent Topaz guards also become one ''bigger'' mostly-silent Topaz guard. [[spoiler: Turns out they have a Garnet-like relationship and choose to be fused more than not. This is used against them when Aquamarine discovers Steven has convinced them to mutiny, threatening the two of them with separation and chastizing them for becoming too "sentimental", suggesting that even Gems of the same type develop feelings for each other when fused, and this is somewhat more accepted but still ostracized.]]
** "Off Colors" reveals more fused Gems who have become pariahs and outlaws in Homeworld society: Rhodonite, a highly-stressed fusion of a Ruby and a Pearl who fell in love and were ostracized and replaced by their Morganite master, and Fluorite, a six-Gem polyamorous fusion who is open to adding more to themselves if that Gem is emotionally compatible.
** "Jungle Moon" gets us into Stevonnie's head some more, as they stay fused and mostly alone for the whole episode. There's a lot of TalkingToThemself and switching from "I" to "we" and back as Stevonnie switches from thinking like Stevonnie, Steven, and Connie at different points. (One attempt to make radio contact says it all: "It's Stevonnie! Steven and Connie! We're stranded! We need help! Come on, don't leave me here!") They shift seamlessly between being one person and functioning quite perfectly as two people in one body. Garnet would approve. They even have a dream in their fused state (with a family photo that interestingly shows Stevonnie in between Connie's parents).
** "Earthlings" reveals what happens when a gem fuses with a corrupted gem monster. [[spoiler: The corruption spreads, mutating the healthy gem into an equally animalistic beast. Jasper learned this the hard way.]]
* In the ''WesternAnimation/FamilyGuy'' episode "Welcome Back, Carter", three skinny girls press themselves together for a group photo and suddenly merge to create one fat girl.
* In the ''WesternAnimation/RegularShow'' episode "Video Game Wizards", when Mordecai tells Rigby that playing with his best friend is more important than winning a video game tournament, they're greeted by a spiritual version of the Power Glove [[BlandNameProduct knockoff]] they're competing for, who for their realization mixes them into a muscular two-headed four-armed being with Rigby's body and Mordecai's head, arms and right leg. They proceed to easily defeat the team they're playing against before going back to normal.

[[folder: RealLife]]
* Male anglerfish are Power Boosters to the extent that some [[CripplingOverspecialization aren't even physically capable of eating]]. Essentially being the fish equivalent of [[HiveCasteSystem drone bees]], their sole purpose in life is to sniff out a female (multiple times their size) and bite into them, releasing an enzyme that slowly reduces the male to a pimple with gonads for a ready supply of semen whenever the female's ready to lay eggs.
* Primary Symbiosis is the biological version of this, where two organisms (a microbe with another microbe or another larger multicellular host) become so necessary for each others' survival that they essentially merge with each other. Bacteria can become incorporated within the actual cells of its host, to the point of almost being considered an organelle. This is, in fact, the origin of mitochondria (thought to be descendants of an ancient alpha-proteobacteria) and chloroplasts (descended from a cyanobacteria), as well as eukaryotic cells themselves!
* [[http://boingboing.net/2009/05/01/the-mind-blowing-wor.html Biological Chimeras and Mosaics]] are basically two developing fetuses performing a Fusion Dance in the womb. A chimera has cells from both twins, with each individual cell containing the DNA of one twin; the proportions vary from case to case, ranging from a few scattered cells here and there to patchwork-like patterns to different organs originating from different individuals.
* A number of modern countries previously existed as smaller entities before fusing into one larger state:
** Germany and Italy were each a collection of smaller kingdoms and principalities before they were each united under a single monarch in the 19th century. Germany did this ''again'' after TheGreatPoliticsMessUp, when the capitalist West Germany merged with the formerly communist East Germany to become Germany as we know it today.
** Many of the provinces and states that make up Canada and the United States were once all separate British colonies. However, they eventually chose to fuse themselves into larger countries by establishing federal governments. Canada is an unusual variant in that many of its founding fathers originally wanted to merge all of the British North American colonies into one single big colony and erase all the provincial borders, although they settled on a federal system over the protests of some of the representatives from the Maritimes, and even moreso the protests of Lower Canada/Quebec.
** The United Kingdom was once the separate countries of England, Scotland, Wales and part of Ireland. England eventually conquered Wales and Ireland, even as it merged the English and Scottish Crowns together. Most of Ireland eventually became an independent republic, although the provinces of Northern Ireland remain part of the U.K.
** What are now the provinces of the Netherlands were different counties governed by Spain in the 16th century. When the Dutch Rebellion began they decided to work together, and that's how the United Republic was born, with roughly the same borders as the Netherlands has today.
** Ditto for (some at least) cities, that as they have growth have absorbed close towns that have ended as districts on them. Despite this they tend to keep their former aspect (layout of the streets, low houses, a large church in the center[[note]]At least in Spain. One example in its capital, Madrid: [[https://en.wikipedia.org/wiki/Vallecas Vallecas]][[/note]], the building of the former town council...)
* Grafting of plants is a common agricultural practice, particularly for fruit trees and for ornamental plants such as roses or potted cacti.
** A botanical sculptor at Syracuse University is in the process of constructing an orchard of grafted-together fruit trees, each of which will bear 40 different varieties of stone fruit (apples, peaches, plums, cherries, nectarines, almonds). In springtime, every branch of each tree will bloom in a different color.
* The Universe ''loves'' this trope. From the smallest scales to the largest ones:
** Nuclear fusion as mentioned above. 'Nuff said. Much earlier, just after the Big Bang, free quarks and antiquarks combined to form protons and neutrons as well as antiprotons and antineutrons respectively.
** Planet formation[[note]]Terrestrial planets. Gas giants, except for their cores, form on a different way[[/note]] is considered to take place in the form of grains of dust and ice combining to small groups (planetesimals) that merge to make protoplanets, and so on until planets are finally formed. The process continues up to this day in our Solar System, when an asteroid or comet collides with Earth or another planet.
** In places with high stellar density as (the centers of) star clusters or centers of galaxies, as well as in [[https://en.wikipedia.org/wiki/Double_star binary systems]] where the stars are very close one to each other, stars can collide and fuse to form larger ones known as [[https://en.wikipedia.org/wiki/Blue_straggler blue stragglers.]]
** Black hole mergers, that we've just recently started to detect via gravitational waves. They deserve special mention since spacetime itself ''rotates'' with them during the dance before merging and when two supermassive ones embrace the event is so violent that the hole product of the merger may be expelled from its galaxy, not to mention the mess left in the surroundings.
** In the [[https://en.wikipedia.org/wiki/Lambda-CDM_model current paradigm]] of galaxy formation and evolution, galaxies grow ''bottom-up'', as small galaxies combine to form larger galaxies, which merge to form larger systems that combine again and so on - bonus points when two galaxies orbit each other before merging, altering their shapes in a true fusion dance - and the same goes for groups and clusters of galaxies and even the [[VoidBetweenTheWorlds voids that separate them]]. This is heavily supported by many observations as well as predicted by computer simulations[[note]]Our own galaxy is disrupting and absorbing a much smaller one and is predicted to merge with the Andromeda Galaxy, which is larger than ours, within 3 billion years; deep surveys have shown many similar events, and messy systems interpreted by astronomers as the product of two galaxies combining to form a larger one as [[https://en.wikipedia.org/wiki/NGC_7252 NGC 7252]] aren't uncommon at all[[/note]]