History Main / SplitPersonalityMerge

* Mingmei Wu and Professor Sorgaz in ''Webcomic/TheWotch'', once Mingmei is made aware of her status as a [[GenderBender gender bent]] teacher dunked in the FountainOfYouth and the origional personality reappears. Perhaps a slight twist on this trope, as well; Mingmei is perfectly willing to go away so Professor Sorgaz can return to his normal life. It is ''Sorgaz'' who proposes merger, claiming she already has a better life than he ever did (He proposes merging the best of both worlds-- her friends, his bank account).

* Happens to [[spoiler:Sasha and Abby when Sasha dies while mentally linked with Abby]] in the Podcast/MetamorCity novel ''Making the Cut.''
* A [[https://anti-catharsis.tumblr.com/post/183557416601/can-i-just-go-ahead-and-say-how-great-the-writing fan commentary]] on the ''WesternAnimation/MiraculousLadybug'' episode ''Oblivio'' describes it in terms similar to this trope.

The resulting merged personality is usually a composite of the parts that is well and truly psychologically stable. This is especially true if they were an [[TheMcCoy id]], [[TheKirk ego]], and [[TheSpock super ego]]. If they were [[GoodAngelBadAngel moral]] or [[RedOniBlueOni temperamental]] opposites, the resulting merged personality will keep traits of both. In more action-driven works, this merger includes combat ability and powers, so if the character had a [[CrouchingMoronHiddenBadass moron and a badass]] coexisting, the united whole will be a badass all the time... while occasionally tripping on banana peels. Similarly, if the reason for the personality split was to seal awesome cosmic powers away (resulting in a SuperPoweredEvilSide; see both EnemyWithin and EnemyWithout) the united self will have full control over these powers without risk of SuperPowerMeltdown or corruption. If the integration isn't a completely smooth ride, however, expect aftereffects similar to AmnesiacDissonance.

* Sownplayed and reconstructed in ''Literature/TheWheelOfTime'': Rand Al'Thor suffered a long time clashing with his previous incarnation, psychotic and homicidal Lews Therin Telamon, and finally snapped. Eventually he [[spoiler: realized, that "voice of Lews Therin" was a way to manifest memories and experience from previous life, and accepted them as his own. Afterwards, he is still Rand, but much more stable, wiser and knowledgeable]].

* ''Fanfic/DanganronpaParadiseLost'': Midway through Chapter 5, [[spoiler:Shion Nanashi has a JourneyToTheCentreOfTheMind after being confronted with the fact that before she got amnesia, [[CanonCharacterAllAlong she used to be]] [[EnfantTerrible Monaca Towa]], which culminates in the two of them merging together. The resultant has both of their memories, answers to the name of Monaca, and has Shion's sense of righteousness]].

* In ''VideoGame/FatalFrame1'', Kirie ended up split into two parts -- one being the vengeful spirit possessed by the Malice and roaming the mansion, killing anyone that comes her way, and another, young version of herself that wants the other to be freed from the Malice and return to her original duty of keeping the Hellgate closed. The post-Final Boss scenes show the two forms merging again, and Kirie returns to her duty.

** In a way, this is end goal of the Eye of the Moon Plan, which requires the union of the nine Tailed Beasts into the single being where they originated from: the Ten Tails. Unlike the case with the Yin and Yang halves of Kurama, this is viewed in a negative light, as it is made clear that the nine are distinct beings with their own personalities, and certainly do not want to become erased just to recreate the Ten Tails.

** The Green Goblin has undergone this after his 1996 comeback, the Goblin previously veering between being an outright SplitPersonality of ComicBook/NormanOsborn, a psychotic break from reality and the power fantasy of an unstable CorruptCorporateExecutive who just won the SuperpowerLottery. Naturally, the amalgation of a mentally ill white collar criminal with his homicidal maniac alternate persona did not exactly make things better- the new Norman Osborn was a MagnificentBastard who developed particularly twisted views on his emnity with Franchise/SpiderMan and graduated from millionaire industrialist to head of S.H.I.E.L.D. (because HumansAreMorons). Recently, the Goblin has shown signs of making a comeback, in the form of delusions and homicidal mania.

This has notably been the accepted method of treatment of those with Dissociative Identity Disorder (DID) by psychiatrists.

* In ''Manga/{{Bleach}}'', Ichigo's power manifested in the forms of Zangetsu, his Zanpakuto, and his Inner Hollow. In time, [[spoiler: he comes to dominate both of them, learning how to use their power for himself. He also tends to take on aspects of their personality and appearance when using their power, such as the coat he acquires in Bankai mode and the mask and personality changes that accompany his Hollowfication. Recently, Zangetsu and the Inner Hollow merged themselves while Tensa Zangetsu was trying to teach Ichigo the [[EleventhHourSuperPower Final Getsuga]]. The result seems to be Tensa Zangetsu wearing a white robe instead of a black one, and having the top part of the Inner Hollow's super evolved mask. However, his personality seems to remain as that of Zangetsu's. Ichigo then merges with THIS personality, and takes on its confidence and... moodiness. Also the inner hollow turns out to be a merger of his Actual Soul Reaper powers and the hollow powers, while Zangetsu is his Quincy powers.]]

* This happens to the main character at the end of ''Literature/CityOfIllusions'' by Creator/UrsulaKLeGuin.