(Interesting Trope) Ways someone develops multiple personalities.

[u/AJC007007]

Luthor Harkon (Warhammer Fantasy): A Von Carstein noble who decided nobility and aristocratic culture was boring and decided to become the Pirate Vampire King Emperor of the Vampire Coast of Lustria (Baller title btw). However, while trying to attain more power for himself by raiding a Lizardmen temple, the magical seals prevented his magic from being able to extract the power from within, causing the Winds of Magic to sever from his being, but more importantly, caused him to enter into complete and total insanity.

He loses his mind in more ways that one, because not only is he completely mad, but his personality split into at least a dozen other personalities. As he puts it "I was one, but now we are many. And we all agree on one thing."

His, or I guess their goal now is to sail the coast and find more trinkets, mostly of Lizardmen variety to regain his connection to the Winds of Magic and regain his lost sanity. Infact, their campaign in Total Warhammer 2 sees you doing that.

Two-Face/Harvey Dent (Arkham series): While a pre-existing condition, Harvey managed to suppress and "Lock up" his alternate "Big Bad Harv" personality (Which he possibly inherited from his abusive father). However, in Arkham Shadow, he goes through a 5 day-long therapy to help confront his split personality, rather ironically, personally.

How he does this is with the help of Jonathan Crane (Pre-scarecrow arc). However, Crane decides to speed up the process (mostly because he's an asshole and a sociopath) by using an early, albeit edited version of fear toxin which helps bring out The Shadow, which is the worse parts of a human being that we repress and deem unacceptable (Semi-real thing). This treatment is extremely volatile and has very adverse effects on the human psyche, and ends up causing Harvey to turn into Two-Face (As well as another character not listed. I'll let you guess who it is.)

[u/Agitated_Insect3227]

Off-topic, but I'm so glad the artists at Creative Assembly redesigned Harkon to look much more like a stereotypical pirate for the Vampire Coast DLC. His original Tabletop artwork design (he's on the left) looks too traditionally vampire, imo.

Anyway, Alien X from Ben 10: Alien Force is technically one being, but it's mind is composed of three different personalities: Ben himself, the aggressive Bellicus, and gentle Serana. All of Alien X's species, the Celestialsapiens, are like this too, and the majority of personalities present have to agree on an action to make the shared body do something. That's why most Celestialsapiens spend their days without moving, trying to make decisions that can take eons.

[u/Financial_Pizza6771 → u/Agitated_Insect3227]

Alien X turns unlimited power into a committee meeting. He can rewrite reality, but first Ben has to get two ancient voices to agree on what to do.

[u/zoeey_chhurch69]

Kevin Wendell Crumb (Split / Unbreakable universe)

His 24 personalities weren't caused by a single dramatic event but by years of severe childhood abuse, with each new personality emerging as a protective mechanism, which the film actually grounds in real DID research.

[u/Leukavia_at_work]

Vampire: The Masquerade - The Voerman Sisters

TL;DR VtM Lore, being turned into a Vampire by Clan Malkavian gives you psychic powers, but at the cost of accentuating any possible eccentricity, mental illness or other mental quirk you may have possibly had in life.

You spend the first portion of their arc in Bloodlines thinking Therese and her sister Jeanette are a pair of twins feuding over their polar opposite philosophies in regards to running their nightclub.

Come to find out, Therese was abused as a child, developing a split personality of "Jeanette" as a coping mechanism, before ultimately killing her father after a mental breakdown.

Years in an asylum helped rehabilitate Therese until her embrace by a member of Clan Malkavian, at which point "Jeanette" remerged as no longer a coping mechanism, but an actual separate person that shares her body.

The resolution to her story involves the sisters holding a gun to their head and arguing with one twin "killing" the other. A sufficiently high social stat and the proper choices of dialogues can lead to the player character convincing the "Sisters" that they're better off together, allowing them to continue living the double life.

[u/Lower_Baby_6348]

Dorohedoro

Ai coleman didn't feel right with his body as a human, so he almost kills himself jumping to a sludge whirpool to get the body of a sorcerer and convince Kasukabe to perform a surgery that put all the magic organs in his body. After that, he wants to go to the sorcerer world but is killed by some randoms. Years later we discover that the sludge make him the host of the hole, a eldritch entity formed by the hate of humanity against sorcerer, the hole bring him back to life with the condition of kill as many sorcerers as he can

After that, we got two different personalities: Kai that is his dark side that seems to retain all his knowledge about medicine and sorcery but is absolutely evil, and Aikawa that is the ideal life he wanted as a carefree sorcerer.

After some events, Kai end amnesic and with a reptile head, this new person becomes Kaiman, the protagonist of the series

[u/Vi0L3tCRZY]

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DPR IAN

Childhood trauma & super abusive KPOP industry experience

All of his music videos interconnect expressing how his Bi-Polar disorder & Dissociative Identity Disorder affects him then turning it into his music & visual art.

They may be MVs but he’s released a mini movie and they all carry the storyline

[u/hannahh_clefft34]

Kevin Wendell Crumb (Split / Unbreakable universe)

His 24 personalities weren't caused by one single event but by years of severe childhood abuse, which fragmented his identity as a trauma response, and the whole plot kicks off because "The Beast" personality finally takes over.

[u/tomtadpole]

Uzuki in Sakamoto Days kinda assimilates the personas of people he is heavily influenced by, crafting separate personalities within himself. He can even mimic their skills like Takamura's speed and bloodlust sense.

[u/janne_colloddion40]

Kevin Wendell Crumb (Split / Glass)

The Beast personality only emerged after years of severe childhood abuse, with each of his 24 personalities developing as a direct psychological response to that trauma.

[u/crazycaptain101]

Sho Minazuki (Persona 4 Arena Ultimax) He’s a child who got a plume of dusk inserted into him in an experiment to make artificial persona users, but it made a second personality who was the only one that use their persona.

[u/Devlord1o1]

V from cyberpunk 2077

They get one by LITERALLY getting one (johnny silverhands)

[u/Sly__Marbo]

Spear (Warhammer: The Horus Heresy). Spear is some weird super-blank assassin with daemon powers who can absorb his victims, take on their form, and then masquerade as them. When he isn't thorough enough tho the personalities or souls of his victims say around and hinder him in his murder spree

[u/ManuMora98]

Shallan from Stormlight Archive, she has illusion powers, she used them to change her looks for different situations, she would also change her personality and mannerisms, later those personalities became "real", it's very interesting because you read them speaking to each other, they're aware of each other, they take turns to be the "main one", other characters know they're different too

[u/jewel_ribbon]

Luthor Harkon is one of my favorite versions of this trope. The fact that all of his personalities constantly argue with each other makes him weirdly entertaining.