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  • Sakubo, a character of .hack//G.U., has a serious case of this. Originally stating he and his sister shared a character, we later find out they're seperate personalties of the same person. Saku, the girl side, is the more violent side and Bo, the actual person, is a shy boy who developed Saku to help him stand up for himself. It's essentially like sticking Blackrose and Elk into one body. Add in the fact that Saku is obsessed with 'White Haired Pretty Boy' Endrance and things get a little weird if you think on it too long... This is hinted when they go berserk due to AIDA and fight Haseo in their Avatar, where both are somehow present. It isn't until the third game we find out the truth, that there was a "Real Saku", as Bo's twin, but she was stillborn. The "Saku" personality was created after Bo over heard his mother saying she wished he'd been the one to die instead, due to how sickly he was. Their personal quest can end with the Saku personality disappearing, though Haseo can encourage her to stick around, which later works suggest is the canon path.
  • Arknights has a couple of operators with disassociative personalities, Popukar and Nightmare. Popukar tends to flip to a more violent self when the rest of Reserve Squad A6 gets into loud arguments, which tends to leave the others in Medical, while Nightmare is undergoing aromatherapy provided by Perfumer with some degree of success in gaining control over her own violent personality. Nightmare as her operator codename is actually also the name of her disassociative self, something that she's not too fond of.
  • Bendy and the Ink Machine: As "Alice," there are two personalities for Susie Campbell: one that's obviously the vain and monstrous side, and one that speaks in a slightly higher voice and is aware of how awful her actions are.
  • In Borderlands 2, Krieg suffers from this as a result of the experiments Hyperion put him through to make him such a deadly killing machine. His dominant, active personality is a lunatic, buzz-ax-swinging berserker who spends most of his time spewing jumbled nonsense (i.e. trying to talk to Maya resulted in him screaming "I'M THE CONDUCTOR OF THE POOP TRAIN!" at the top of his lungs). His original personality has been downgraded to a voice in his head that tries to steer the Psycho's murderous impulses towards more deserving targets, but can't do very much beyond that. About the only thing the two consistently share is that both are in love with Maya and believe that she is the one capable of curing them. Or at least the sane personality does. The Psycho personality doesn't particularly want to be cured.
  • Goal gets a variation on this in Chaos On Deponia — Her mind was stored on a hard-disk-like brain implant, but after some Rufus-related shenanigans, the data on it is split into three disks, each of which contains a third of Goal's personality. Rufus can use a remote control to flip Goal between her selves. Tuning in the right Goal for the right situation is a core mechanic of the game.
  • Perpentach, the mad king of the Belseraphs in Civilization: Fall from Heaven, is this trope to a ridiculous degree. Due to his lineage, he has an incredible affinity for Mind Magic — so much so that he can't even control it properly. Any ordinary person who got close to him had their minds stolen from them, turning them into his slaves and adding their personality to his own. Hundreds of minds all locked within his own quite understandably made him snap, hard. The calamity ended only when his master Kylorin solved the problem by locking Perpentach's mind away and imprisoning Perpentach within a derelict building in a remote swamp... Which did the trick, until a wandering circus troupe got too close, hence explaining the theme of Perpentach's current form as well as his nation as a whole.
  • In the Strategy-RPG h-game "Cursed Futana Ring", The incredibly kind and age-forged loyal maid Ily has been in Lana and her family's service around since Lana was a baby, when a corrupt regiment arrives to take their home from them under questionable pretenses, she offers Lana her former hovel as a place to rest as Lana is forced to sort this whole mess out. The events near chapter 1's ending reveal that Ily is a beautiful futanari that had to lie about the true details of the ring that gave Lana her power to grow her newfound magic as Ily did long ago, minus most of the negative points, as it would tip off those looking for those with the rare "Cursed Seal" power. In the concluding third chapter, it turns out that Ily was once known as the Cursed Seal Princess as her original power is directly tied to her formerly sexually sadistic self, who absolutely relished in her conquest to control most likely the entire world before burying this side of herself at some point in the past. Unfortunately for Lana and friends, Baldo and his robed, ritual-researching mooks unexpectedly end up unearthing Ily's former sexually sadistic sidenote , forcing Lana and her friends to save her and the world, as the Cursed Seal Princess dethrones Baldo's villainous reign quite easily and temporarily becomes the Cursed Seal Princess' second-in-command during her MUCH more deadly reign.
  • In Clock Tower II: The Struggle Within, the entire storyline is based around a girl who has a malevolent split personality.
  • Riley Durden and Dying Joe in Cruz Brothers as an shout-out to Fight Club. There is not much difference between both in personality or even moveset it's just that he dress differently and doesn't answer to the other persona's name.
  • Royal Sorcerer Navlaan from Dark Souls II appears timid and gentle if you approach him in human form, but should you speak to him in hollow form, you'll meet his other personality — a malicious and evil being who will send the player on assassination missions. The good side of Navlaan sealed himself behind a magical barrier after the evil side went on a murder spree, and begs the player not to let him out. If you do let Navlaan out, you'll be attacked by dark phantoms of his evil side all around Drangleic.
  • Agent Francis York Morgan of Deadly Premonition often has conversations with "Zach", to the confusion of others. Near the end, it's revealed that Zach is the original personality and York was developed as a child in order to protect Zach's psyche. Eventually, Francis York Morgan goes back to being Francis Zach Morgan in order to confront Forrest Kaysen for the finale.
  • Tink from Disgaea 2: Cursed Memories has two sides — the "blue" personality, which is calm, polite, and timid, and the "red" personality, which is lecherous, short-tempered, rude, and selfish. It takes a magic spell to suppress his "red" side in the cutscenes, though he can switch between them freely in actual gameplay. When in the "red" side, he gets a boost to his stats by being near female characters and is generally more powerful, while his blue personality has a larger then average movement range.
  • Manah, the Creepy Child Big Bad of Drakengard, seems at first to be suffering from this. It later turns out to be part-Split Personality, part-Demonic Possession.
  • The Elder Scrolls:
    • The series' Aedra have oddly conflicting personality traits or govern over unusual combinations of spheres. Much of this can be traced back to St. Alessia's founding of the religion of the Eight Divines, which stitched together the classic Aldmeri pantheon her Nedic people were used to with the old Nordic pantheon of her Nord allies. Examples include Kynareth being the Goddess of the Air with a Friend to All Living Things slant while also being a Valkyrie and Psychopomp, and Stendarr being the God of Justice and... taking prisoners alive for ransom.
    • Akatosh, the draconic God of Time and chief deity of the Aedra gets hit with it especially bad. To note:
      • As mentioned above, this applies to most of the Aedra. However, Akatosh gets it the most. This is taken to the point where Cyrodiilic stained glass and statuary depictions of him show that he has two heads, a dragon head and a human head.
      • Crossing over with Literal Split Personality and Pieces of God, In-universe speculation is that Alduin (and perhaps all dragons and Dragonborn) is more akin to a fragment of Akatosh's being rather than his son. (For what it's worth, Alduin disputes this claim.)
      • The Maruhkati Selective, an extremist sect of the already-extremist Alessian Order, tried to force this onto Akatosh by using powerful magics and the Staff of Towers to split the Aldmeri aspect of Auri-El from Akatosh. It's not clear if they actually succeeded, but their efforts ended up causing The Middle Dawn, the most extreme Dragon Break in history.
    • Sheogorath, the Daedric Prince of Madness, is a split personality of Jyggalag, the Daedric Prince of Order. When the other Daedric Princes grew afraid of how powerful Jyggalag was becoming, they used their powers to curse him into becoming the very thing he hated the most. Oblivion's Shivering Isles expansion ends with you splitting them into two separate and distinct beings by taking on the mantle of Sheogorath yourself.
    • Shivering Isles is also contains a village called 'split' where each citizen has been turned into two people based on their Manic and Demented sides.
  • A pirate appears in Escape from Monkey Island who has developed two additional personalities in order to cope with having his ego shattered by the Ultimate Insult. They are manifested through the puppets he wears in a Punch and Judy type of show, which themselves take on the forms of the series' hero and villain in appearance, though not so much in personality.
  • Eternal Darkness' Xel'lotath speaks in two voices - one is well-spoken, rational, and almost as imperious as the paper to her scissors Ulyaoth, while the other sounds extremely paranoid and somewhat delusional, always using a quiet but harsh whisper. In cutscenes where she chats with Pious, it sounds like a conversation with three people. Fittingly, she is the Ancient of insanity.
    • Not only does she have two voice actresses who each take a personality, they also swap the rational/irrational role depending on the scene!
  • Socks, the lunatic boxer from Facebreaker, has two personalities (a nice, English-accented intellectual and an angry psychopath), which manifests in the sock puppets that he uses for boxing gloves.
  • The Fallout: New Vegas DLC, Dead Money, introduces Dog/God, a Nightkin with split personality. Dog is the dumb, violent, Extreme Omnivore who obeys Elijah's every whim and brings victims to the Sierra Madre to help him break in. God is exceptionally intelligent and well-spoken, but very cold and calculating and regularly threatens the people he's with. Dog comes out when a recording of Elijah's voice is played, and God comes out after Dog hears a recording of God's voice. In the end, Dog attempts to commit suicide and the player can kill him or talk him out of it, which allows for him to encourage one of the personalities to take over or merge both of them into a single balanced being.
    • All of the Nightkin have some form of this due to their overuse of Stealth Boys, Their illness has more in common with real-world dissociative identity disorder, but is referred to as schizophrenia in accordance with 1950's science.
  • In Final Fantasy VII, the protagonist Cloud suffers from a case of split personality, where thanks to Mako/Jenova experiments at the hands of Hojo, the Jenova cells injected inside him take over his brain and create a new persona based on Cloud's desires about being a badass SOLDIER operative like his idol Sephiroth and his friend Zack. The real Cloud is reduced to a mere voice in his head. There's also a third personality lurking in the dark corners of Cloud's mind, the "Sephiroth's Clone" with no goals and desires other than serve Sephiroth, and this one can come to the surface and take over by Sephiroth's command "Wake up".
  • Fire Emblem:
    • In Fire Emblem: Awakening, Noire has two personalities: a meek, timid one; and a bloodthirsty Large Ham that provides one of the more memorable catchphrases in the game. This second personality arose from a talisman that her mother made for her, and with it she was able to survive the destroyed world of the future.
      BLOOD AND THUNDER!!
    • Jeritza in Fire Emblem: Three Houses at first seems like just a cold and anti-social guy, but it turns out that, as a result of trauma he experienced in his past, he has a split personality that manifests as the Death Knight, an enemy frequently encountered throughout the game, and the reason he distances himself from others is because he's afraid the Death Knight will kill anybody he gets close to.
    • Also from Three Houses, we have Constance, whose personality switches depending on whether she is exposed to sunlight. Out of the sun, she is a haughty Large Ham. Under the sun, however, she becomes a sullen Shrinking Violet.
    • Fire Emblem Engage has Veyle, who has this. Her normal personality is a kind and friendly person, but she also has a dark personality brought out by Sombron's mind control who enjoys killing and despises humanity. Neither personality is aware of what the other does, leading to a lot of conflict, particularly in their interactions with the heroes. Eventually, encouraged by her sibling Alear, Veyle breaks free from Sombron's control, and in turn, effectively kills her evil personality.
  • Flower Knight Girl: The Ancient Flower Knight Common Zinnia is by default a blue-eyed, meek blacksmithing who looks up to her close friend Zinnia, a renowned hero of their time. Following Zinnia's death on their latest mission to Kodaibana, Common Zinnia formed Fake Memories and an alternate personality based on them as a way to cope with their death. This personality being the "Hero Zinnia", a red-eyed, outgoing fighter who's a talented gunslinger.
  • The Galaxy Angel II trilogy has Kahlua Marjoram, a blonde young witch who transforms into her Sexier Alter Ego, the purple-haired Tequila. Kahlua demonstrated great aptitude for magic since a young age, but an incident where she accidentally caused a fire and drove away a close friend out of fear caused her to block herself. As a result, she developed a second personality in order to handle the trauma and be able to use magic again. The final game of the trilogy gives a twist by revealing that Tequila was the original personality, and Kahlua was the alter-ego created following the incident, but her memories were modified by their mentor so she would believe she was the original and work through the trauma.
  • Ethan from Heavy Rain experiences occasional blackouts, and he believes that these blackouts occur when his alternate personality (who he believes is the Origami Killer, who is responsible for kidnapping his son) takes over. The actual Origami Killer is a completely separate character, and there's no real explanation given for Ethan's blackouts.
    • The reason behind Ethan's blackouts could be both the trauma he suffered from the accident he had trying to save Jason, or the stress caused from it. That and since the Origami Killer has been over the news recently, he could have (unconsciously) attempted to find a way to blame himself for something.
  • Jacket from Hotline Miami is implied to have one of these; each act begins with him "visiting" a room with three animal-masked entities.
    • "Richard" has a yellow hue, wears Jacket's Iconic Outfit and a rooster mask, and behaves in an ominous and mysterious manner, making various predictions and asking Jacket questions (if he likes hurting other people, who is leaving the messages on his answering machine, etc.). He's primarily there so that he can blur the line between what is real and what is not, as shown with his habit of Leaning on the Fourth Wall.
    • "Don Juan" has a blue hue and wears a green dress (just like Jacket's girlfriend in at least one scene) and a horse mask. "Don Juan" is also the name of a fictional libertine who was notorious for his womanizing ways and sexual conquest; this could mean that she is how Jacket views intimacy with women like his girlfriend. She always politely comforts Jacket whenever he visits, oftentimes tries to push him away from Richard's reality-checks, and serves as a foil to Rasmus' harsh hostility.
    • Lastly, "Rasmus" has a red hue and wears the standard Russian mobster outfit, along with an owl mask. He is unique in that he is the only one of the masked trio who openly does not want Jacket to be in the room, and speaks to him in a very hostile and angry manner. Rasmus seems to represent harsh judgement and hostility, along with Jacket's conflation of both of those things with the many people who he has murdered.
  • Inazuma Eleven 2's Fubuki Shirou has a special mention of a Split Personality aside from other characters with dual modes. His regular persona, a soft-spoken and timid defender, and his alter persona, created from a memory of his dead brother, a Hot-Blooded and reckless forward. The issue is developed further in the story.
  • In Killer7, the player-controlled character actually has seven distinct personalities, with their own looks, special abilities, everything. There's even a personality that's albino, one that's paraplegic, and one that's a woman.
    • In the first versions of killer7 the physical body that everybody else sees is Garcian's. There was either a cutscene or just a part of a level that showed this when Dan walked into a bathroom and saw himself Garcian. This is also alluded to in the released game when confronting Curtis Blackburn when he says "you turned into a badass".
    • In the ending, everything you knew about the split personalities is all torn down. They aren't Harman's split personalities. They're Garcian's, with the weapons of the six recessive personalities in Garcian's suitcase. Also, "Garcian Smith" is a more literal split personality of Emir Parkreiner, the most powerful assassin in the world, so powerful that a god's avatar says that he's not even a mortal being anymore.
  • In Layton Brothers: Mystery Room, there is seemingly only one Layton brother, despite the title. The plural title refers to his split personality which occasionally pops up during investigations and interrogations; compared to his "normal" personality, this one is much ruder and more abrasive. The ending reveals that the "Potty Prof" personality is actually the original one, with the "Placid Prof" having been created through hypnosis in an attempt to have him take the blame for a murder.
  • Played realistically (for once) in Mass Effect with the character of Talitha, who only shows up in certain branches of the Player Character's Multiple-Choice Past. She was kidnapped by batarian slavers as a child; after her release, she is a Third-Person Person who perceives her abusive experiences as having happened to someone else.
  • Metal Gear Solid games:
    • In Metal Gear Solid 2: Sons of Liberty, the protagonist Raiden was a deadly child soldier known as "Jack the Ripper", but after coming to America, blocked out this persona from his memories. This is explored further in Metal Gear Rising: Revengeance, where the Ripper persona resurfaces, to bloody and devastating effect for Raiden's enemies.
    • In Portable Ops: Twins Elisa and Ursula are in fact one and the same.
      • Crying Wolf of Metal Gear Solid 4 suffers from a split personality. The "wolf" personality has a compulsion to murder children and the "crying" personality mourns those killed by the "wolf", but seems unaware that she is the "wolf".
      • The Beauty and the Beast Unit in general, really. In all of their back stories, they end up doing something morally atrocious in response to extreme hardship and trauma during a war, and are found consumed by some manner of emotion in disbelief that it happened, blaming a wild animal for their actions. All four stories end with Drebin saying, "of course, there was no (animal)." They're all so similar, someone coded a Beauty and the Beast Unit back story generator.
  • In Mugen Souls, the main plot revolves around Chou Chou recruiting new peons, continents, and even planets as her allies with her different split personalities.
  • Mystery Trackers: The Void involves the sinister events following the disappearance of Marius Void and his criminally-inclined "brother" Sirius.
  • The ren'ai game Ori Ochi Onoe is a rare instance of two people having a love triangle or in this case, rectangle.
  • Sho Minazuki from Persona 4: Arena Ultimax is violent, childish and loves bad puns. He has another personality (born from the Plume of Dusk implanted into his body) that is calm, calculating and ruthless. In the English localization, the wilder personality is referred to as 'Sho', while the other is referred to as 'Minazuki'.
  • In Potion Permit, Dev the postman has a split personality that comes out when he gets exhausted. His alter Dan is an eccentric, enthusiastic, and somewhat kleptomaniacal wannabe pirate, but otherwise harmless.
  • Brad Kilstein from Psychic Force. For someone who is voiced by Ryūsei Nakao, he is surprisingly soft-hearted and abhors fighting and violence. However, at one point, his personality may revert into the typical RyĆ­sei Nakao character: a brutal, sadistic Ax-Crazy Psycho for Hire.
  • Psychonauts:
    • Ford Cruller suffers from this due to a battle that shattered his psyche in the past and is only able to remain stable within his underground sanctuary, which houses one of the largest psitanium deposits. His personalities are all named Cruller and serve as several different roles in the camp, ranging from Ranger Cruller, Admiral Cruller, Chef Cruller, and so on.
    • Fred Bonaparte and his split personality Napoleon Bonaparte — Fred knows he's crazy, he just can't seem to get rid of Napoleon until Raz helps him out. (Crosses over with Genetic Memory).
  • Randal's Monday: One of the patients at the therapist office. Robert is the normal personality, an Alan is the crazy one.
  • Gemini from Sakura Wars: So Long, My Love seems to be pulling a not-very-convincing masked vigilante act, until it's eventually revealed that she has a sister Geminine... living inside her.
  • In Samurai Shodown, Nice Girl Nakoruru is revealed to have a seemingly more malicious personality named Rera, who seems to be a Superpowered Evil Side at first but turns out to be more of a Well-Intentioned Extremist, able to take the actions Nakoruru isn't able to. Rera is a rather interesting case in that she developed from an easter egg in the original games where Nakoruru's purple second player color would often sport a malicious grin. This was expanded in later games with the Slash and Bust system where her bust variant would be the purple version, controlling the wolf Shikuru. This was finally expanded in the prequel, Samurai Shodown V, as Rera, who would take over Nakoruru when the latter wasn't able to deal with the disappearance of her father and adopted sister, not protect herself from danger. By the end of that game, it's said that both sides were finally to reconcile, allowing Nakoruru to keep Rera in control.
  • Soul Series:
    • Tira, who has had her brain broken by prolonged exposure to Soul Edge, and she flips back and forth between her original "joyous" personality (where she'll kill you with a smile on her face) and her "malicious" one (where she'll just kill you).
    • Siegfried: before Nightmare could fully take over (and before Nightmare became a completely separate entity), Siegfried and Nightmare were sharing one body, and Siegfried would usually wake up covered in blood.
  • This also happened in the Space Ace video game (which later became a short-lived cartoon). After being struck by the bad guy's "Infanto-Ray", Ace would sometimes involuntarily transform into Dexter, a skinny, nerdy, teenage alter-ego.
  • In Spec Ops: The Line, The John Conrad that Walker spends most of the game interacting with appears to be a hallucinatory second personality created by Walker's stress and latent PTSD. Walker spends half the game pushing the blame for all his mistakes onto Conrad, whose incarnation Walker interacts with tries to bring to light all the self-justifications, repressions, and outright lies Walker forces himself through in order to avoid coming to terms with how messed up his situation has become. Just how Walker decides to come to terms of it when he meets the real Conrad in the end segment and finally can't deny his situation any more makes up much of your choices in the ending.
  • In Vampire: The Masquerade - Bloodlines, you meet a pair of Polar Opposite Twins, Therese and Jeanette Voerman, who run the nightclub The Asylum in Santa Monica. Therese is a prim and proper businesswoman who doesn't have much patience for anything "vulgar" or "crass," and tries to conduct herself in a very professional and cool-headed manner. Jeanette is the life of the party, flippant and frequently sleeping with whoever she pleases, vampire or otherwise, much to Therese's chagrin. The two are never seen in the same place, but you can eavesdrop on the two of them arguing behind a locked door, and read vitriolic emails they leave for each other on their computer. They draw you into their sisterly feud, and depending on who you side with more often, eventually, one of them will call you in a panic, claiming that the other is holding them at gunpoint, and begging you to come help. When you get there, you quickly realize that they're not actually flesh and blood sisters, but rather, Therese is a Malkavian, who are known for their mental derangement, who's had dissociative identity disorder since she was a child as the result of being regularly sexually abused by her father, and Jeanette is the promiscious, carefree alternate personality she developed to cope. They think of each other as sisters, and give differing accounts of what became of their father; Therese, who's in extreme denial about what happened to her and insists that her father loved her and that she was a "good girl," says that Jeanette's rebellious behavior drove him to drink and eventually kill himself. Jeanette claims that one night, their father mistook her for Therese, snuck into their room, and was about to abuse her, when Therese fronted, found them together, and "shot him in a jealous rage." Therese was placed in a mental instituion, and during her stay, Jeanette never fronted (presumably due to drugs she was administered) but after she was turned into a vampire, Jeanette returned. They're now at each other's throats, and it's up to you to decide if you just want one of them to live, or if you'll try to remind them that they really do love each other and convince them to stop fighting. Word of God is that the writers carefully researched DID in order to maintain the arc's plausibility.
  • In the "bad" ending of Strife, it is revealed that Blackbird and The Entity are the same person. Whether Blackbird was a real woman on this plot path, and what became of her if she was, is not revealed.
  • Dinah, one of the spirits from Summon Night: Swordcraft Story 2 has a Good Angel, Bad Angel split personality. The "bad angel" personality is the default one, though sometimes her "good angel" side will shine through every now and then to apologize profusely for Bad!Dinah's rudeness.
  • Super Robot Wars:
    • Super Robot Wars: Split Personality is the gimmick of the heroine of SRW Destiny, Cliana Rimskaya. One is a rougher, stoic girl that is capable of piloting and kicking ass, one is a Nice Girl.
    • Super Robot Wars Original Generations: In Mugen no Frontier: SRW OG Saga, Lamia Expy Aschen Brodel has personality split disorder. Just wait until she reveals some skin, and all the stoic android facade gets replaced with a Genki Girl personality.
  • Tales Series:
  • The main heroine of Time and Eternity has one in the form of the soul of a completely different person, Towa, inhabiting her body. Switching out between the two of them, with their different personalities and fighting styles, is a game mechanic.
  • In The Ultimate Haunted House, the house's owner Gahan Wilson suffers from this, due to a formula he drank. One personality is good, the other is evil, and it is difficult to tell which one is in control at first glance. Part of the difficulty of dealing with Gahan is that Evil Gahan will often pretend to be Good Gahan so that he can mock you and curse you after you give him an item.
  • In Um Jammer Lammy, Captain Fussenpepper has a Split Personality, making him either The Ditz who can't tell right from left or a Drill Sergeant Nasty and War Hero.
  • Mythra/Pyra in Xenoblade Chronicles 2. After Mythra sank the titan Torna in the Aegis War 500 years before the game, she creates Pyra as a separate, weaker personality to put some distance between herself and everything she went through, as well as make sure her full power is kept in check. Later, they're also able to morph into Pneuma, essentially a Split-Personality Merge, while the very end of the game makes them a Literal Split Personality.
  • Xenogears:
    • One of the villains in Xenogears turns out to be an alternate personality of the main character, created as a coping mechanism against his childhood abuse. The villain's name, "Id", offers a vital clue to those with knowledge of psychology. Notably, neither are the original personality, and the situation only gets more complicated once reincarnation's thrown into the mix).
    • Xenosaga Episode II also has a mini-boss who alternates between two personalities, one of which is cold and cruel, the other of which is hot-blooded and nasty. Oddly enough, she doesn't feature in any story sequences and is just a throwaway boss.

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