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When dealing with a character that has a SplitPersonality, there will frequently be a striking visual difference depending on who is "in control." It's not a literal transformation, like [[Literature/TheStrangeCaseOfDrJekyllAndMrHyde the original Jekyll and Hyde]]; it's still recognizably the same person, but the differences will be visible. This may include anything from subtle stylistic changes (the character's design becomes more hard and angular when an evil or aggressive personality is in control, but softer and more rounded when a kind and good personality is in control) to more physical things like changes in hairstyle and [[LooksLikeCesare black bags under the eyes]]. A significant vocal shift is common as well.

Some of these changes are perfectly possible to do without physically altering the person's body, like the personalities having hair that's styled differently (or one of them [[MessyHair not styling it at all]] and another styling it neatly) but the same length, or changes in body language and posture, or talking differently without completely changing voice actors, but others are firmly in the realm of ArtisticLicense.

These changes may or may not be noticed in-universe; if they are, expect them to treat the change as something intangible. They'll comment "he's like someone completely different now!" or "that's not the person I know!" rather than "hey, when did you get your hair cut?" or "did your voice just drop two octaves?".

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!!Examples

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[[folder:Anime and Manga]]
* Yugi from ''Anime/YuGiOh'' is one of the most prominent examples; when his "[[SeriousBusiness playing card games]]" personality takes over, his hairstyle changes, his eyes switch from {{Tareme Eyes}} to {{Tsurime Eyes}}, his voice deepens significantly, and he's drawn to appear taller and more imposing. (The height change only happens in the anime, though, and in Japanese he kept the same voice actor, who just changed her delivery style.) Happens with Bakura and Marik too.
* Allelujah Haptism from ''{{Gundam 00}}'' is a more subtle example; which personality is in control depends on which of his [[DualityMotif differently-colored eyes]] is hidden by his PeekABangs. Unusually for this trope, he's actually seen shifting his hair around in-universe when he changes personalities, rather than it happening automatically as a stylistic change.
* Jamie from ''ZoidsNewCentury'' gains swept back hair and a bold, deep voice when he becomes [[RedBaron the Wild Eagle]] during air combat.
* You can tell whether Agito or Akito is in control on Manga/AirGear depending on which eye their eye patch is on. They also have differently shaped pupils, and in the anime, drastically different voices. [[spoiler: The third personality, Lind, takes it a step farther; he has a totally different hairstyle and cross-shaped pupils]].
* In ''{{Psyren}}'', [[SuperpoweredEvilSide Abyss]] has darker skin than [[spoiler:Sakurako]].
* Motoko, the female protagonist of ''{{Change 123}}''. (Just look at the picture on the linked page!)
* Lucy, the main character in ''ElfenLied'' has rounder eyes, child-like and a softer expression as her second personality Nyu.
* Razlo and Livio from ''TrigunMaximum'' have a system with fairly reasonable in-universe mechanics. When Livio's running things, he has his long hair flipped over on side of his face. When Razlo takes over, he flips it to the other side and we discover that the previously covered side of his head is bald with weird computer-chip tattoos and a wild eye.
* The manga 'Historie,' a biography of one of Alexander the Great's secretaries, starts weird, and when Alexander finally appears gets weirder. Apparently Alexander is a rather sweet little prince who developed a split personality upon walking in on his mother having an affair with a slave. That split personality is (Alexander's real-life [[HoYay best friend]]) Hephaestian, who is kind of a dick and whose presence is signified by a fixed stare and covering up Alexander's snaked-shaped forehead birthmark with his mother's makeup.
* Lady Une in GundamWing has a split personality (which Treize claims is his fault), and the Colonel and the Diplomat can be distinguished easily by the former having her hair up and wearing glasses, and the latter wearing it down and taking the glasses off, as well as changes in facial expression and posture.
* Sensui, the biggest single villain in ''YuYuHakusho'' (and the mangaka's favorite) has ''[[UpToEleven seven]]'' personalities. We meet three, and the visible difference is as impressive as it is subtle, having as much to do with mannerisms and speech patterns as it does visual cues.
* In ''Manga/SaintSeiya'', Gemini Saga has two personalities; when "Good Saga" is in control, he has [[YouGottaHaveBlueHair blue hair]] and calm blue eyes. When "Evil Saga" is in control, he has gray hair and white eyes with bloodshot sclerae.
** His successor, [[Anime/SaintSeiyaOmega Gemini Paradox]], has something similar, changing from blue hair to [[PaintItBlack black]]. As a bonus, the interior of her temple [[FisherKing changes along with her]].
* Played straight with Zwei's two personalities Echo & Noise, from ''Manga/PandoraHearts'' . It even came as a shock to the main cast when they were revealed as being one and the same person. While Echo has dead eyes, free flowing hair, dresses in uniform, has a calm/stale posture and a voice that is generally gentle/weak, though devoid of emotion. When turning into Noise her eyes go wild with ecstasy, she braids her hair with an ornament, strips of all clothing (dressing up in a nightgown and bloodred cape), moves as if she was the star of a play and shouts/screams her words.
* There is no actual split personality involved, but Molossia from ''WebComic/AxisPowersHetalia'' changes from his real NiceGuy personality to a {{Delinquent}} [[JerkassFacade fašade]] in seconds by changing his hairstyle and putting on a jacket and sunglasses when anyone but America enters his territory.
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[[folder:Comics]]
* Some of the artists who have drawn ComicBook/{{Superman}}, like Frank Quitely and Ed [=McGuiness=], have made a point of giving Clark and Superman slightly different appearances to help explain why so few people make the connection between the two of them. Quitely's version of Clark, for instance, has a noticeably hunched posture and badly combed hair (whereas his Superman has the usual spitcurl). [=McGuiness=]' Superman has a perpetual squint, while his Clark's blue eyes are usually visible.
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[[folder:Film]]
* Buddy Love in the original version of ''TheNuttyProfessor''.
* Gollum from ''Film/LordOfTheRings'' qualifies - not only does his voice change, but his appearance is also subtly different.
* Willem Defoe does a masterful job of this playing Norman Osborne/Green Goblin in the first SpiderMan movie. Using only facial expression, vocal changes and body language, he becomes a completely different character, NightmareFuel incarnate.
* Not a split personality, but when {{Mulan}} is dressed as a [[SweetPollyOliver soldier]], she is drawn with no eyelid folds and a more angular jaw to make her look more masculine.
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[[folder:Literature]]
* Thendy Bravura (also known as another dozen names) in ''{{Felsic Current}}'' incurs very visible personality changes. Often, others can tell he's just "done it again" merely by witnessing his facials features melt into a completely different countenance, before he even speaks. Their mounting exasperation to these frequent incidences is usually the source of [[FunnySchizophrenia comedy]].
* The dark Cinderella adaptation ''Sunny Ella'' plays with this, as Ella sees the world (and herself) one way but the reality of the situation is much different. Ella sees herself as a beautiful fairy tale heroine with a lovely singing voice and a sunny disposition; in reality she is mute, scarred, unkempt and has violent tendencies.
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[[folder:Live Action Television]]
* They comment on this extensively in the miniseries ''{{Jekyll}}''. Hyde is slightly taller and thinner than Jackman, he has a slightly different hairline and jaw shape, and his eyes are jet black. Of course it's the same actor plus platform shoes and different tailoring/shooting angles, but the effect is subtle and present, and many viewers who may not even notice the prosthetic changes at the start of the series will immediately be able to identify which one of them is in control by the end, even without the vastly different body language and behaviour.
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[[folder:Video Games]]
* Therese Voerman from ''VampireTheMasqueradeBloodlines'' is a stiff Ventrue IceQueen in a business suit. Her "twin sister" Jeanette is a slutted-up Malkavian party girl. You find our they're sharing the same body when you reach the end of their storyline, and find Therese/Jeanette wearing Therese's clothes but with her makeup and hairstyle split between Therese's professional do and Jeanette's party girl do.
* ''[[DotHackGUGames .hack//G.U.'s]]'' [[spoiler:Sakubo]] lets you know who is in control by [[spoiler:her[[note]]Although Saku is a girl and Bo is male, the Sakubo character model is female[[/note]] hat, which changes which point is up, backpack, which changes color, eyes that switch from {{Tareme Eyes}} to {{Tsurime Eyes}}, and skirt which flares out or flattens. Her hair also gains a bit of a curve outward as Saku.]] Given that this is an MMORPG, this is hidden under the guise of [[spoiler:Saku and Bo being twin brother and sister.]]
* In ''VideoGame/DragonAgeII'', this is the case with Anders. While [[KnightTemplar Justice]] is in control, he will have GlowingEyesOfDoom and a severe case of EvilSoundsDeep (the "evil" part may, however, be debatable), as well as a minor case of PowerEchoes.
* ParappaTheRapper: Captain Fussenpepper's face turns red and his eyes become bloodshot when he's in his DrillSergeantNasty personality. Hairdresser Octopus's entire body turns red and his tentacles move when he's in his crazy personality.
* ''VisualNovel/DanganRonpa'' has [[spoiler:Touko Fukawa, an asocial, rude author]]. At the sight of blood, [[spoiler:Fukawa reveals her other persona, Genocider Syo, an infamous serial killer]]. The two are discernably different in that [[spoiler: Genocider Syo]] has red eyes and an OverlyLongTongue.
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[[folder:Western Animation]]
* Mike from ''WesternAnimation/TotalDrama'', to different degrees depending on which personality is in control. [[GrumpyOldMan Chester]] is hunched over, has wrinkles and speaks in an older-sounding voice, [[ForeignExchangeStudent Svetlana]] has eyelashes, unique irises, and lipstick, and speaks in a female voice with a Russian accent, [[{{Jerkass}} Vito]] has slicked-back hair, sounds like he's from {{Joisey}} and doesn't wear a shirt (since Mike losing his shirt is what triggers the personality begin with) and [[AwesomeAussie Manitoba Smith]] has an Australian accent and a fedora (again, because Mike putting on a fedora is what triggers him). [[spoiler:[[TheSociopath Mal]] has PeekABangs, a [[EvilSoundsDeep deeper tone of voice]] (which also has [[VoiceOfTheLegion a reverb effect]] sometimes), and dark bags under his eyes, though he can hide everything but the occasional reverb when [[HydePlaysJekyll masquerading as Mike]].]]
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