My name is Legion, for we are many.Some people are victims of Demonic Possession or Grand Theft Me. Others have to struggle with the Enemy Within, or even an outright Superpowered Evil Side. All those things are terrible in their own way, but don't worry, it can always go From Bad to Worse. It's one thing when your body is taken by the 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 Demonic Possession or Enemy Within Up to 11. Instead of having one evil/antagonistic being taking over somebody, it's multiple ones. Somebody doesn't have just Jekyll & Hyde inside his head—it's Jekyll, Hyde, Steve and Edmund. And Zoidberg. The Trope Namer is a song by HammerFall, based on the famous biblical tale of Legion, man possessed by multiple demons, which is obviously the Trope Codifier. Contrast I Am Legion, another trope named after this tale (and a story in The Bible), which occurs when members of a group start referring to themselves as a group, rather than individual people, implying that they lost their individuality or at least see themselves as a community or partners. Compare Mind Hive and Split-Personality Team, similar tropes involving multiple minds/personalities simultaneously inhabiting one body, but are more or less in accord with each other. Likely to speak in the Voice of the Legion.
— Mark 5:9
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Anime and Manga
- Battle B-Daman 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 Sayonara, Zetsubou-Sensei chapter, this is done with Kaere. She's the fauxreigner Foreign Fanservice character and she splits into an entire United Nations' worth of personalities. 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 Bleach Ichigo Kurosaki shares his body with the spirit of his weapon, Zangetsu, and his Superpowered Evil Side, Hollow Ichigo. It's later revealed that Hollow Ichigo is the true Zangetsu whose name was stolen, and the other spirit is a piece of someone else's soul trying to take Zangetsu's power for itself.
- Jindai Komaki and Iwato Tatsumi from 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 could give 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 split personality. Not to mention the time Itachi shoved his crow down Naruto's throat...yeah, it's kind of crowded in there.
- By the end of the series, he's lost his parents, Itachi's crow, and his evil half, but gained the rest of the nine Biju, Hagoromo Otsutsuki, and Ashura, who was always there to begin with since Naruto is his reincarnation.
- In Fullmetal Alchemist:
- Father and the Homunculi all contain many human souls within their bodies, which act as 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.
- Hoenheim has a massive number of human souls in them, but 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. This means those souls are not constantly freaking out and move with him in a singular purpose of will, making him, in some ways, more powerful than Father or the Homunculi, who only use those souls as fuel.
- A seemingly more benign version occurs in My Hero Academia. 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.
- In X-Men Charles Xavier's son, Legion, once had multiple personalities with different superpowers. Then he went better, but as a whole was so powerful that he caused the Age of Apocalypse. 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 Mind Hive.
- The Incredible Hulk: 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 the Hulks and Banner merged into Professor Hulk, who was later retconned 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 Lucifer has host to the 12 Basanos.
- A later story has a large group of demons holding a conference inside of a possessed man while the demon who "provided the venue" is making him run around the city at night doing increasingly terrible things.
- She-Dragon from Savage Dragon combined this trope with Hearing Voices. 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, they belonged to beings on a counter-Earth.
- In the French series Zorn Et Dirna, Death Takes a Holiday (well, gets trapped in a Magic Mirror), 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).
Films — Live-Action
- In The Exorcism of Emily Rose 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 Very Loosely Based on a True Story 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 Adolf Hitler.
- Matthew Swift 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 John Dies at the End, by Cracked's David Wong, gives us Shitload, who is the host body of a hive mind.
- At the end of Children of Dune, Alia is overcome with the personalities of her ancestors within her and starts speaking with many voices.
- The Truth has 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 was only seen once and nobody wants to see him again.
- There's also Tiffany Aching in A Hat Full of Sky who is possessed by a Hiver, which in turn gives her flashes of personality from its previous victims.
- 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.
- A brief gag in Carpe Jugulum involving a man who had seven personalities, four male and three female. They used to fight for control when he had a drink and they all wanted to taste it, but mostly one was left in charge and the other six were at the back of his mind ... pairing up. He resented this.
- Shades from the Inheritance Cycle 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.
- The Dire Magnus from the Books of Beginning trilogy is an example of this.
- It's indicated this may be the case with Randall Flagg in The Stand. 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 Animorphs, Visser One is horrified when she first infests 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.
- In the Jacob's Ladder Trilogy, necromancers, who specialize in downloading the recorded minds of the deceased into their own brains, eventually become this.
Mallory: I've got a head full of so many dead people I suspect whoever I started off as should probably be counted as one of them.
- In The Girl From The Well, the ghost called the woman in black is actually an amalgamation of hundreds of evil spirits into a single form.
- In the Lois Mcmaster Bujold book The Hallowed Hunt, one of the Literature/Chalion'' books, this turns out to be the situation of the Big Bad Wencel. Hundreds of years ago when their country was in the process of being conquered, the last Hallowed King underwent a sacred ritual to ensure that if he were to die, his consciousness would pass to the next male heir in his line to continue the fight. And the next, and the next, and the next... The consciousness that originally inhabited these bodies is swallowed up and added to the amalgamation. By the time the story reaches the present day, he's given up all ambitions beyond ending the cycle and dying once and for all. When we get a look at him through spirit vision, he's a monstrous abomination of hundreds of twitching faces vying for control.
- In a Stargate SG-1 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.
- Star Trek: The Next Generation 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 Star Trek: Voyager episode "Infinite Regress," Seven of Nine manifests the personalities of the people she had assimilated as a Borg drone.
- In the Star Trek Verse, the Kurlan believed that a person was made up of a group of individuals, each with his own voice. A Naiskos was a sculpture representing a person, which could be opened to reveal several little people inside it.
- Alpha and Echo on Dollhouse, who don't forget their previous implants.
- In Kamen Rider Den-O, the main Rider is possessed by an Imagin. ...then another, and another. When suited, each possessor makes a different Den-O with a different Weapon of Choice. Though they're not all in him at once, any can take over at will. Hilarity Ensues (literal, non-ironic hilarity, that is) often.
- When he uses 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 Castiel swallows the Leviathans in season 6 of Supernatural, he starts hovering somewhere between this trope and Mind Hive.
- The Doctor in Doctor Who is something between this and Mind Hive, being an amalgamation of themself, the Other, and Zagreus.
- This occurs several times in the New Testament:
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.
- Jesus encounters a violent demon-possessed man who identifies himself as "Legion, for we are many." If taken at face value as a reference to a Roman legion, that would indicate about a thousand demons inside one individual. Jesus exorcizes the demons and sends them into a herd of pigs, which they destroy.
- There's another New Testament reference — St. Matthew XII, xliii.–xlv.:
- 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.
- Mutants & Masterminds 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.
- Portal 2 reveals this to be the case with GLaDOS, the other voices in question being the personality cores you destroyed in the first game.
- According to its Pokédex entries in Pokémon, Spiritomb is composed of 108 souls, trapped over 500 years.
- Platinum the Trinity of BlazBlue is a Magical Girl with a rather unpleasant female personality (Luna), a nicer male personality (Sena) and one of the six heroes (Trinity) sharing the same body.
- The Mask of the Betrayer expansion pack for Neverwinter Nights 2 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 Mass Effect is a single body inhabited by numerous operating systems. Despite seeming very similar, they were split evenly when you must decide whether to kill or convert the Geth heretics.
- Ermac from Mortal Kombat is this, especially later in the series.
- In Live A Live, O. Dio from the Western Chapter. 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 Kingdom Hearts habitually invites other people in, although he usually isn't consciously aware of doing so. At this point he's renting out space to Ventus, Xion, Roxas, and probably Vanitas, and 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, he's the hijacker, with the proper owner body being Terra. It counts as this trope because Terra took in Master Eraqus as a passenger shortly before Xehanort did his thing.
- In the PlayStation 2 title Guilty Gear 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 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 Final Fantasy V is 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.
- Turel from Legacy of Kain is possessed by several hundred hylden ghosts when you find him in defiance, they later move on to Raziel to inspire him to go through with killing Kain.
- In the 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 Diablo III, 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 Star Wars: The Old Republic, the Sith Inquisitor eventually learns the Force-Walk technique, allowing them to bind Force-ghosts, willing or not, to themselves in order to augment their powers. Unfortunately, binding too many spirits ends up causing them to suffer a Heroic R.R.O.D., forcing them to find a cure.
- In Bioshock this is a side effect of using plasmids. The ADAM samples the genetic memory so using too much or too often leads to one "Seeing ghosts" (Aka memories of the past users) In Bioshock 2, the Big Bad , Sophia Lamb, decides to intentionally invoke this on her daughter. She plans on filling Eleanor with all the ADAM in Rapture so Eleanor will cease to exist and instead be the perfect Utopian who only works for the common good and with every skill and talent ever in Rapture at her command.
- In Umineko: When They Cry, by the end of the series, you can count at least four different personae that are within Yasu's body. Basically, s/he is more or less confirmed to be Shannon, Kanon and Beatrice. However, if you count all of his/her imaginary friends 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 Yasu's personae and not actual people.
- In Tower of God Hoaqin's final 'clone' turned out to be the conglomeration of Albelda and the billions of souls that White had consumed prior to his "death".
- Tina from Wapsi Square is a "rats running the ship" version of this. The original Tina died long before the comic started, and her 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? They opened a coffee shop.
- In A Beginner's Guide to the End of the Universe, the Everyman turns out to be the personification of all of humanity.
- Two Guys and Guy: Played With. Guy has many demonic spirits inside. But none of them have that much control over her.
- This happens to Brutaka from BIONICLE in the web-serials, when he falls into a vat of Antidermis. This is the substance from which the Big Bad'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 Fantastic Drug. Thus the spirits do not corrupt Brutaka, he receives Powers via Possession, but his mind is totally overwritten, and his body becomes deformed.
- Twitch Plays Pokémon 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.
- Blitzwing from Transformers Animated has three personalities—a cool, calm tactician with ice blasts, or more awesomely, ice missiles; a rowdy, battle-loving hothead with fire blasts; and a cackling, non-sequitur spouting Talkative Loon 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 Batman: The Animated Series, 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 Avatar: The Last Airbender, 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 Unstoppable Rage, 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 Killed Off for Real.)
- After season 2 in The Legend of Korra, 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 bereft of the influence and experience of its past human incarnations it's been reduced to its most primal savage state.
- A milder version (which may have been Flanderized to this trope) is when people have inner conflicts and don't know what they should do. Like Faust by Johann Wolfgang von Goethe 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...
- Dissociative Identity Disorder (DID). A person with this condition may have just one other personality ... or several.