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[[caption-width-right:330:You think roommates are awkward?]]

->''My name is Legion, for we are many.''
-->[[Literature/TheBible Mark 5:9]]

Some people are victims of DemonicPossession or GrandTheftMe. Others have to struggle with the EnemyWithin, or even an outright SuperpoweredEvilSide. All those things are terrible in their own way, but don't worry, it can always go FromBadToWorse. It's one thing when your body is taken by the [[{{Satan}} lord of all evil himself]], but when he invites his twelve best drinking buddies to join the ride, that's something else entirely.

This trope is what you get if you take DemonicPossession or EnemyWithin UpToEleven. Instead of having one evil/antagonistic being taking over somebody, it's ''multiple'' ones. Somebody doesn't have just JekyllAndHyde inside his head--it's Jekyll, Hyde, Steve and Edmund. AndZoidberg.

The TropeNamer is a song by Hammerfall, based on the famous biblical tale of Legion, man possessed by multiple demons, which is obviously the TropeCodifier. Contrast IAmLegion, another trope named after this tale, which occurs when members of a group start referring to themselves as a group, rather than individual people, implying that they lost their individuality.

Compare MindHive, a similar trope which occurs when multiple minds/personalities simultaneously inhabit one body, but are more or less in accord with each other.

Likely to speak in the VoiceOfTheLegion.

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!!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* ''Anime/BattleBDaman'' has Bull, a boy with three personalities: calm one, confident one and aggressive one.
* Although for the most part, she actually only has one personality (the other one almost never comes up), in one ''Manga/SayonaraZetsubouSensei'' chapter, this is done with Kaere. She's the {{fauxreigner}} ForeignFanservice character and she splits into an entire United Nations' worth of personalities. [[spoiler:Inverted with Kafuka who happens to be one spirit within many bodies due to all the girls in class having one of her organs. Add another personality to Kaere's long list of personalities.]]
* In ''Manga/{{Bleach}}'' Ichigo Kurosaki shares his body with the spirit of his weapon, Zangetsu, and his SuperpoweredEvilSide, Hollow Ichigo. Zangetsu and [[FanNickname Hichigo]] seem to be representations of his powers, rather than his psyche, but still.
* Shinobu Sensui from ''Manga/YuYuHakusho'' has ''seven'' personalities.
* Jindai Komaki and Iwato Tatsumi from ''{{Manga/Saki}}''. They are both {{Miko}}, and they each have 9 goddesses that they tend together. Only one goddess can surface in a character in any given time, but their opponents can expect to essentially fight Komaki ''twice''.
* The title character of ''Manga/{{Naruto}}'' could give [[Franchise/KingdomHearts Sora]] a run for his money. For a start, he's the person-shaped can of a nigh-unstoppable monster. Then we find out that ''both'' his dead parents stored imprints of themselves in the seal, which triggered at separate points. The Waterfall of Truth briefly made his suppressed bitterness manifest into a [[EnemyWithout split personality]]. Not to mention the time Itachi [[ThatCameOutWrong shoved his crow down Naruto's throat]]...[[http://gabzillaz.deviantart.com/art/Naruto-497-crack-166273579 yeah, it's kind of crowded in there.]]
* In ''Manga/FullmetalAlchemist'', Father, the Homunculi, and [[spoiler:Hohenheim]] all contain many human souls within their bodies, which act as [[PoweredByAForsakenChild fuel]] for their powers. In most of these examples, it's an inversion of the trope--the host is the evil one, possessing a lot of tortured souls within them.
** [[spoiler:Hoenheim]] in particular plays with the trope even further when he reveals that over his long life he's reached an accord with each and every individual soul housed within him.
* A seemingly more benign version occurs in ''Manga/MyHeroAcademia''. We learn that the wills of the previous users of Midoriya's Quirk, "One For All", continue to exist and can be witnessed by its current user. When Midoriya sees them, they briefly take control of his finger and injure it to snap him out of his opponent's brainwashing. After the fight, Midoriya's mentor and predecessor All-Might denies this is the case, but it's implied he's not being entirely honest about it.
[[/folder]]

[[folder:Comicbooks]]
* In Comicbook/XMen Charles Xavier's son, Legion, once had multiple personalities with different superpowers. [[SplitPersonalityMerge Then he went better]], but as a whole was so powerful that he caused the ComicBook/AgeOfApocalypse. He later came back, now having hundreds of personalities, each with its own unique power. Some of them are minds of dead people he drained, making him a combination of this trope and MindHive.
* ''Comicbook/TheIncredibleHulk'': At the beginning it was only Bruce Banner and the ruthless Gray Hulk, who turned green and then started getting constantly dumber until we get the most well-known version of the character, the Savage Hulk. Later a new Gray Hulk, a mischievous and selfish version of the first gray Hulk, joined them. Then [[SplitPersonalityMerge the Hulks and Banner merged]] into Professor Hulk, who was later {{retcon}}ned to be a completely different personality altogether. Recently, the four of them have been joined by Green Scar--an intelligent, brutal warrior persona. There was a story revealing that Banner has a lot more Hulks in his mind, including such creatures as the lizard-like Guilt Hulk or the monstrous Devil Hulk, but the question of whether it's still in the continuity remains debatable.
* Jill Presto from ''Comicbook/{{Lucifer}}'' is host to 12 Basanos.
* She-Dragon from ''Comicbook/SavageDragon'' combined this trope with HearingVoices. The personalities never took over but there were very distinct perosnalities and voices in her mind that would speak out loud. As it turns out, [[spoiler: they belonged to beings on a counter-Earth.]]
* In the French series ZornEtDirna, DeathTakesAHoliday (well, gets trapped in a MagicMirror), so killing someone results in their soul being tranferred to your body. The closest thing to actual death is achieved by having criminals kill people in vast slaughterhouses, accumulating souls until they in turn are killed by another person (Zorn and Dirna's mother is the dominant personality inside a huge ''male'' barbarian).
[[/folder]]

[[folder:Films -- Live-Action]]
* In ''Film/TheExorcismOfEmilyRose'' Emily at one point starts speaking in demon voices as the demons say there are many of them in her and each one has possessed a different evil person throughout the history. Movie is VeryLooselyBasedOnATrueStory of Anneliese Michel, who was suffering from severe mental problems and had many seizures. She also believed she was possessed, specifically by Lucifer and several evil people throughout history, including Cain and UsefulNotes/AdolfHitler.
[[/folder]]

[[folder:Literature]]
* Literature/MatthewSwift shares his mind with the numerous entities known as The Electric Blue Angels to the point that the first person narration is constantly switching between "I" and "We."
* The novel ''Literature/JohnDiesAtTheEnd'', by Website/{{Cracked}}'s David Wong, gives us Shitload, who is the host body of a hive mind.
* At the end of ''Literature/ChildrenOfDune'', Alia is overcome with the personalities of her ancestors within her and starts speaking with many voices.
* In the ''Literature/{{Discworld}}'' books there's Altogether Andrews, a man with about eight personalities, of whom none are named Andrews. It's theorized that he was a medium who was too accommodating to lost spirits, and ended up getting pushed out of his body.
** Subverted in that most of his personalities are nice. Except for Burke, who [[NoodleIncident was only seen once and nobody wants to see him again.]]
** There's also Tiffany Aching in ''Discworld/AHatFullOfSky'' who is possessed by a Hiver.
** Subverted in Myria LeJean. The Auditors possessing her named this body expecting continued collectivism, but the form bestowed individuality upon whatever Auditor force(s) operated it, and at the end she changes her name to Unity.
* Shades from the ''Literature/InheritanceCycle'' are sorcerers whose bodies have been taken over by the spirits they command. The first one we meet (Durza) only has three spirits controlling him, but in the third book, we meet one who has ''twelve''.
* It's indicated this may be the case with Randall Flagg in Literature/TheStand. After Tom is put into his trance, he talks of the New Testament references--Flagg's name being Legion and Jesus driving him into a herd of pigs once.
* In ''Literature/{{Animorphs}}'', Visser One is horrified when she first infested a human, comparing a human's ability to doubt and question their own decisions as "living with our own traitor in our heads". She thinks this is why humans frequently war against each other -- they are practically at war with themselves.
[[/folder]]

[[folder:Live-Action TV]]
* In a ''Series/StargateSG1'' episode, Doctor Jackson has been possessed by personalities of multiple members of a spaceship's crew. Surprisingly, it was one of the rare examples when possession in this show wasn't evil.
* ''Series/StarTrekTheNextGeneration'' episode "Masks": Data is possessed by an alien probe, and takes on the personalities of various figures from the mythology of an extinct civilization. Mainly an excuse to let Brent Spiner act his nuts off.
* Similarly in ''Series/StarTrekVoyager'' episode "Infinite Regress," Seven of Nine manifests the personalities of the people she had assimilated as a Borg drone.
* In the ''Franchise/StarTrek'' {{Verse}}, the Kurlan believed that a person was made up of a group of individuals, each with his own voice. A [[http://memory-alpha.org/wiki/Kurlan_naiskos Naiskos]] was a sculpture representing a person, which could be opened to reveal several little people inside it.
* [[spoiler: Alpha and Echo]] on ''Series/{{Dollhouse}}'', who don't forget their previous implants.
* In ''Series/KamenRiderDenO,'' the main Rider is possessed by an Imagin. ...then another, and another. When suited, each possessor makes a different Den-O with a different WeaponOfChoice. Though they're not all in him at once, any can take over at will. HilarityEnsues (literal, non-ironic hilarity, that is) often.
** When he uses [[AllYourPowersCombined Climax Form]], Momotaros seems to remain the "default", but the other spirits are represented by pieces of armour. They can and do start arguing over how to go about things.
* After [[spoiler: Castiel swallows the Leviathans]] in season 6 of ''Series/{{Supernatural}}'', he starts hovering somewhere between this trope and MindHive.
* [[DarkMessiah The Doctor]] in ''Series/DoctorWho'' is something between this and MindHive, being an amalgamation of [[AntiVillain themself]], [[{{Precursor}} the Other]], and [[EldritchAbomination Zagreus]].
[[/folder]]

[[folder:Religion]]
* There's another New Testament reference — St. Matthew [-XII-], xliii.–xlv.:
-->And when an unclean spirit is gone out of a man he walketh through dry places seeking rest, and findeth none. Then he saith: I will return into my house from whence I came out. And coming he findeth it empty, swept, and garnished. Then he goeth, and taketh with him seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is made worse than the first.
** Of the little the Bible says for sure of Mary Magdalene, one thing is that Jesus drove seven demons out of her.
* Possession by multiple spirits is a core element in Korean shamanism, which is claimed to be a close descendant from Siberian shamanism. In a ritual, the shamans invoke multiple spirits to possess them one after another, so that they can borrow multiple powers to accomplish a goal. Somewhat frightening to see in real life.
* In Shintoism, a shrine can be build to venerate multiple deceased individuals at once, if there was something that connected them when they were alive. The ''kami'' (loosely, 'deity') of this shrine is a singular entity that represents all the deceased. One of the (many) reasons that the Yasukuni Shrine is berserk-inducing for Koreans is because it honors the war dead of Imperial Japan, which included enlisted soldiers from then-conquered people, including Koreans-- the clergy of Yasukuni refuses to take down the Koreans registered in the shrine, citing that they are part of the ''kami'' of Yasukuni.
[[/folder]]

[[folder:Tabletop Game]]
* ''TabletopGame/MutantsAndMasterminds'' character Moodswing, from the Super Unicorn META-4 universe chronicled in Crooks and in the 1E Player's Handbook, is a Chinese psychic who currently carries the minds of 6 other psychics in his head, his powers varying depending on who is in control.
[[/folder]]

[[folder:Video Games]]
* VideoGame/{{Portal 2}} reveals this of [=GlaDOS=]. From whom in the first game, you remove and destroy personality cores.
* One of the DLC characters for ''VideoGame/BlazBlue'' is a MagicalGirl with a rather unpleasant female personality, a nicer male personality and one of the six heroes sharing the same body.
* The [[VideoGame/NeverwinterNights2 Mask of the Betrayer]] expansion pack for ''VideoGame/NeverwinterNights2'' gave us One-of-Many - an amalgamation of several hundred spirits. He is governed by the worst of these--and as a result he is a twisted monster that keeps tempting you to do evil and add additional spirits to "the many".
* Legion from ''Franchise/MassEffect'' is a single body inhabited by numerous operating systems. Despite seeming very similar, they were split evenly when [[spoiler: you must decide whether to kill or convert the Geth heretics.]]
* Ermac from ''Franchise/MortalKombat'' is this, especially later in the series.
* In ''VideoGame/LiveALive'', [[BigBad O. Dio]] from the Western Chapter. [[spoiler:He's actually a horse possessed by the vengeful spirits of a regiment that got wiped out, taking out their hatred for humanity on an old west town. The horse returns to being a horse after O. Dio is defeated.]]
* Sora from ''Franchise/KingdomHearts'' habitually invites other people in, although he usually isn't consciously aware of doing so. At this point he's renting out space to [[spoiler: Ventus, Xion, Roxas, and probably Vanitas]], and [[spoiler: Kairi]] was also in there for most of the first game. Most of his tenants are fairly nice people, but all but two of 'em ''were'' trying to kill or suppress him at one point or another, intentionally or not.
** The villain of the series, Xehanort, is this as well, notable in that, for most of the series, [[spoiler: he's the hijacker, with the proper owner body being Terra]]. It counts as this trope because [[spoiler: Terra]] took in [[spoiler: Master Eraqus]] as a passenger shortly before Xehanort did his thing.
* In the Playstation 2 title VideoGame/GuiltyGear XX there's Zappa; A polite and friendly Aussie who's perfectly normal on the surface (Save an eccentric taste in wardrobe) except for the fact that he's the unknowing host to a grab bag of crazy ghosts including a spectral sword, a few dozen wisps, a hellhound, and an armor-clad lightning spirit. The most powerful and malevolent of his "guests" is S-Ko who [[ClingyJealousGirl readily takes control of him whenever he attempts to interact with other people]]. Unlike S-Ko, the weaker spirits are loyal to Zappa, often comforting him whenever he is depressed or sad.
* [=ExDeath=] from ''VideoGame/FinalFantasyV'' is [[spoiler:a living tree with many evil spirits sealed inside him. The release of these spirits combined with the power of the Void are what cause him to transform into Neo [=ExDeath=] at the games' end.]]
* [[spoiler:Turel]] from ''VideoGame/LegacyOfKain'' is possessed by several hundred hylden ghosts when you find him in ''defiance'', [[spoiler:they later move on to Raziel to [[ThePlan inspire him to go through with killing Kain]].]]
* In the ''VideoGame/{{Diablo}}'' series, the Prime Evil (as opposed to the Prime Evils, which are merely the three most powerful of the Great Evils) is the embodiment of all seven Great Evils in one being. The original Prime Evil was Tathamet, from whose body the Burning Hells and the original Great Evils sprang, but in ''VideoGame/DiabloIII'', [[spoiler:Diablo is reborn as the Prime Evil, and the reason he is able to be dominant over his brothers in this form is because Adria used Leah, her own daughter by him by means of his last host, as his vessel]].
* In ''VideoGame/StarWarsTheOldRepublic'', the Sith Inquisitor eventually learns the [[{{Necromancer}} Force-Walk]] technique, allowing them to bind Force-ghosts, willing or not, to themselves in order to augment their powers. [[spoiler: Unfortunately, binding too many spirits ends up causing them to suffer a HeroicRROD, forcing them to find a cure.]]
[[/folder]]

[[folder:Visual Novels]]
* In ''VisualNovel/UminekoNoNakuKoroNi'', by the end of the series, you can count at least four different personae that are within [[spoiler:Yasu]]'s body. Basically, [[AmbiguousGender s/he]] is more or less confirmed to be [[spoiler:Shannon, Kanon and Beatrice]]. However, if you count all of his/her {{imaginary friend}}s who don't actually take control of his/her body, the number of people in there easily jumps into the double-digits. It's a stinking party in his/her head. This is a slight variation on this trope, though, since these are all simply [[spoiler:Yasu]]'s personae and not actual people.
[[/folder]]

[[folder:Webcomics]]
* Tina from ''Webcomic/WapsiSquare'' is a "rats running the ship" version of this. The original Tina died long before the comic started, and her [[OurDemonsAreDifferent personal demons]] decided to take control of the body and walk out of the morgue. And what did these demons living on their own do? [[DarkIsNotEvil They opened a coffee shop.]]
* In ''Webcomic/ABeginnersGuideToTheEndOfTheUniverse'', [[spoiler:the Everyman turns out to be the personification of all of humanity.]]
* ''WebComic/{{Two Guys and Guy}}'': Played With. [[http://www.twogag.com/archives/1284 Guy has many demonic spirits inside. But none of them have that much control over her.]]
[[/folder]]

[[folder:Web Originals]]
* This happens to Brutaka from ''Franchise/{{Bionicle}}'' in the web-serials, when he falls into a vat of Antidermis. This is the substance from which the BigBad's species, the Makuta is born, and it contains the spirits of the unborn Makuta. Thankfully, they are all ''good'' by nature, and to Brutaka's species, Antidermis even works as a FantasticDrug. Thus the spirits do not corrupt Brutaka, he receives PowersViaPossession, but [[IAmLegion his mind is totally overwritten]], and his body becomes deformed.
* ''LetsPlay/{{TwitchPlaysPokemon}}'' features the Mob, who are usually interpreted as thousands if not ''tens'' of thousands of arguing, bickering, complaining Voices, all hijacking the same bodies. Most of them want to beat the game, but some want to sabotage the others' efforts, and others still ''generally'' want to win the game but want to dick around along the way. Amongst those who want to win, there are constant arguments over strategy, team choice, gameplay style, and all sorts of other things, with the result being chaos. When they actually work together, though, there is literally nothing that can stop them.
[[/folder]]

[[folder:Western Animation]]
* Blitzwing from ''WesternAnimation/TransformersAnimated'' has three personalities--a cool, calm tactician with [[AnIcePerson ice blasts]], or more awesomely, ice ''missiles;'' a rowdy, battle-loving hothead with [[PlayingWithFire fire blasts]]; and a cackling, non-sequitur spouting TalkativeLoon who can use ''either'' of their powers. He's also got two vehicle modes: Icy uses jet, Hothead uses tank, Random uses either.
* In one episode of ''WesternAnimation/BatmanTheAnimatedSeries'', Two-Face developed a third persona: Judge, a ruthless vigilante who was punishing criminals. Both the Harvey Dent and Two-Face personae were unaware of Judge's existence. It also seems that Judge didn't know he shared a body with them, since he was ruining Two-Face's plans and tried to kill him.
* In ''WesternAnimation/AvatarTheLastAirbender'', the Avatar is normally just one reincarnated person with the ability to use all four elements. If that person accesses the Avatar State, usually through an UnstoppableRage, he contacts the spirits of every single Avatar before, channeling thousands of spirits through one mortal body. It's a little bit scary. (The catch is, if an Avatar dies in that state, he or she is KilledOffForReal.)
* After season 2 in ''WesternAnimation/TheLegendOfKorra'', [[spoiler:Korra's link to her past lives is severed after Raava is temporarily slain. Even after they are reunited, it's just her and Raava now.]] The Avatar State is arguably even scarier now, since [[spoiler:bereft of the influence and experience of its past human incarnations]] it's been reduced to its most primal savage state.
[[/folder]]

[[folder:Real Life]]
* A milder version (which may have been [[{{Flanderization}} Flanderized]] to this trope) is when people have inner conflicts and don't know what they should do. Like Theatre/{{Faust}} by Creator/JohannWolfgangVonGoethe said: "Two souls alas! dwell in my breast."
* Modern neuroscience backs this up. As an experimental treatment for severe epilepsy, some people have had their corpus callosum severed, to prevent seizures from swamping the entire brain. This leaves the two halves of the brain, left and right, intact but unable to "talk" to each other. Result: the patients exhibit some fascinating behaviors that almost seem to indicate two different people living in their heads. (It is, however, limited to two.) There have been a fascinating case study of a man with severed corpus callosum trying to beat his wife with one hand and protect her (from himself) with the other. The implication is that we ''all'' have two people in our heads, but they work in such close tandem that we rarely notice...
* [[http://en.wikipedia.org/wiki/Dissociative_identity_disorder Dissociative Identity Disorder (DID)]]. A person with this condition may have just one other personality ... or several.
[[/folder]]

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