History AdaptationPersonalityChange / MarvelCinematicUniverse

* [[invoked]] [[ComicBook/AvengersTheKreeSkrullWar The Kree and Skrull]] Empires [[SwappedRoles effectively swap personalities]] in relation to the comics for the films. In the comics, while often villains, the Kree are still pretty reasonable, having long peaceful periods along with being willing to work with the good guys against greater cosmic threats (such as Thanos), whereas the comic version of the Skrulls are an almost always AlwaysChaoticEvil ReptilianConspiracy (as seen ''ComicBook/SecretInvasion'' where they almost take over the Earth). In the [=MCU=], the Skrulls are a deeply tragic and sympathetic NotEvilJustMisunderstood WoobieSpecies of WarRefugees who openly acknowledge that they've done horrible things in their war with the Kree, but more than anything else just want a chance to live their lives far from Kree oppression. Heck, the [=MCU=] Skrulls even from an OddFriendship of sorts with humanity, helping out ComicBook/{{SHIELD}} in ''Film/SpiderManFarFromHome'' and [[spoiler:having a personal connection to Monica Rambeau in ''Series/{{Wandavision}}'']]. In sharp contrast, the [=MCU=] version of the Kree are warmongering fascist imperialist [[AliensAreBastards assholes]] with no redeeming traits whatsoever, to the point where their war against the Skrulls is reframed in the films as a FinalSolution against a weaker foreign nation who simply refused to be enslaved instead of a ProperlyParanoid preemptive strike against their former oppressors as it was in the comics.

** Princess ComicBook/{{Shuri}} is a GadgeteerGenius and helps design and implement much of the new technology in Wakanda, effectively making her Black Panther's [[Characters/JamesBondQ Q]]. This is a complete 180 from her comic counterpart, who is very spiritual and heavily tied to the mystical aspect of Wakanda. In fact, the comic version of Shuri is probably even ''more'' spiritually-inclined than her brother.

* Tony Stark aka Film/IronMan differs greatly from his [[ComicBook/IronMan comic counterpart]]. He’s still an egotistical InsufferableGenius with a reckless approach to saving the world, but he isn’t the self-hating BrokenAce who imprisons his friends and repeatedly throws the world into chaos from the comics. In general, MCU Tony due to being the first hero and overall main character is even considered the BigGood and saviour of the world, in the comics this tends to be Captain America’s role while Tony is only TheLancer at best (when he isn't directly opposing Cap). Also, comic Tony continued being a ArmsDealer, while [=MCU=] Tony ends his company's weapons program after he sees the destruction it's caused (instead re-orienting it as more of a "generic" tech conglomorate and clean energy producer) and the only weapons he makes (apart from his PoweredArmour) are solely for his friends and loved ones to use while saving the world. Tony in the comics also keeps being TheCasanova and a PlayboyMillionair after his origin story with a ''lot'' of different {{Love Interest}}s in different comic runs while MCU Tony lets this days behind after the events of the first film and eventually gets monogamous with Pepper Potts, eventually [[HappilyMarried starting a family with her]].

* Tony Stark aka Film/IronMan differs greatly from his [[ComicBook/IronMan comic counterpart]]. He’s still an egotistical InsufferableGenius with a reckless approach to saving the world, but he isn’t the self-hating BrokenAce who imprisons his friends and repeatedly throws the world into chaos from the comics. In general, MCU Tony due to being the first hero and overall main character is even considered the BigGood and saviour of the world, in the comics this tends to be Captain America’s role while Tony is only TheLancer at best (when he isn't directly opposing Cap). Also, comic Tony continued being a ArmsDealer, while [=MCU=] Tony ends his company's weapons program after he sees the destruction it's caused (instead re-orienting it as more of a "generic" tech conglomorate and clean energy producer) and the only weapons he makes (apart from his PoweredArmour) are solely for his friends and loved ones to use while saving the world.

* ComicBook/CarolDanvers gets quite a lot of this. In the comics (especially the earlier ones), Carol is an extremely passionate person to point of being HotBlooded and generally very outgoing having friends on both the Avengers and X-Men as well as being quippy as Spider-Man (whom she’s very close with). [[Film/CaptainMarvel2019 MCU Carol]] is a much more introverted, stoic and irritable person, being a DeadpanSnarker {{Troll}} even among her allies, although there’s some InUniverse justification since she believes she's a Kree soldier for most of her solo movie and has spent a ''lot'' of time away from other humans in ''Film/AvengersEndgame''[[note]]in actuality both the filmmakers and her actress Creator/BrieLarson hadn't fully figured out Danvers' personality at the time due to shooting her ''Endgame'' scenes prior to ''Captain Marvel''[[/note]]. Carol's [[DefrostingIceQueen friendlier and more easygoing attitude]] as seen in both ''[[WesternAnimation/WhatIf2021 What If...?]]'' and TheStinger of ''[[Film/ShangChiAndTheLegendOfTheTenRings Shang-Chi]]'' is closer to how she [[DependingOnTheWriter usually]] is in the comics.

* ComicBook/CarolDanvers gets quite a lot of this. In the comics (especially the earlier ones), Carol is an extremely passionate person to point of being HotBlooded and generally very outgoing having friends on both the Avengers and X-Men as well as being quippy as Spider-Man (whom she’s very close with). [[Film/CaptainMarvel2019 MCU Carol]] is a much more introverted, stoic and irritable person, being a DeadpanSnarker {{Troll}} even among her allies, although there’s some InUniverse justification since she believes she's a Kree soldier for most of her solo movie and has spent a ''lot'' of time away from other humans in ''Film/AvengersEndgame''[[note]]in actuality both the filmmakers and her actress Creator/BrieLarson hadn't fully figured out Danvers' personality at the time due to shooting her ''Endgame'' scenes prior to ''Captain Marvel''[[/note]]. Carol's [[DefrostingIceQueen friendlier and more easygoing attitude]] as seen in both ''WesternAnimation/WhatIf'' and TheStinger of ''[[Film/ShangChiAndTheLegendOfTheTenRings Shang-Chi]]'' is closer to how she [[DependingOnTheWriter usually]] is in the comics.

* [[invoked]] [[ComicBook/TheKreeSkrullWar The Kree and Skrull]] Empires [[SwappedRoles effectively swap personalities]] in relation to the comics for the films. In the comics, while often villains, the Kree are still pretty reasonable, having long peaceful periods along with being willing to work with the good guys against greater cosmic threats (such as Thanos), whereas the comic version of the Skrulls are an almost always AlwaysChaoticEvil ReptilianConspiracy (as seen ''ComicBook/SecretInvasion'' where they almost take over the Earth). In the [=MCU=], the Skrulls are a deeply tragic and sympathetic NotEvilJustMisunderstood WoobieSpecies of WarRefugees who openly acknowledge that they've done horrible things in their war with the Kree, but more than anything else just want a chance to live their lives far from Kree oppression. Heck, the [=MCU=] Skrulls even from an OddFriendship of sorts with humanity, helping out ComicBook/{{SHIELD}} in ''Film/SpiderManFarFromHome'' and [[spoiler:having a personal connection to Monica Rambeau in ''Series/{{Wandavision}}'']]. In sharp contrast, the [=MCU=] version of the Kree are warmongering fascist imperialist [[AliensAreBastards assholes]] with no redeeming traits whatsoever, to the point where their war against the Skrulls is reframed in the films as a FinalSolution against a weaker foreign nation who simply refused to be enslaved instead of a ProperlyParanoid preemptive strike against their former oppressors as it was in the comics.

** [[Characters/GuardiansOfTheGalaxyModern Nebula]] eventually gets the biggest example of this; in the comics when she's not a BrokenBird she's a brutal DarkChick who actively works against the good guys and seeks to become a tyrant herself. In the first two Guardians movies, while she's pretty cruel she's also deeply sympathetic and only helps Ronan because she wants revenge on Thanos for his years of torture. In the later movies she even helps the Avengers save the universe from Thanos, while in the comics she tried to kill the survivors of Thanos's Decimation with the Infinity Gauntlet before being stopped.

** William Foster in the comics started off as a biochemist who eventually joined Hank Pym as the boisterous crimefighter "Goliath" and was killed by a EvilKnockOff of Thor in ''ComicBook/CivilWar'' for his troubles. In the MCU Foster is a RetiredBadass who enjoys being a laid back biochemist, though he does put himself at risk when he decides to help Ava Star fix her {{Intangibility}}.

** In the ''ComicBook/CivilWar'' comics, ComicBook/BlackPanther was against registration and sided with ComicBook/CaptainAmerica on the issue. In the film, because the triggering event of the Accords is the deaths of Wakandaian emissaries and furthered by [[spoiler: Cap helping ComicBook/BuckyBarnes, who T'Challa thought killed his father (when it really was the aforementioned Zemo)]], T'Challa is for registration and assists Iron Man. He's also more hotheaded and impulsive than his comic counterpart (who is usually TheStoic), though he shows signs of moving closer to his classic characterization by the end of the movie.
* In ''Film/DoctorStrange'':

* ComicBook/{{Loki}} is a different kettle of fish in the comics since he lacks a lot of the reasonable motivations and heroism from the films and most of the evil things he does are purely ForTheEvulz. His sole FreudianExcuse in the comics was the abuse he suffered under his hands of his Ice Giant parents, in the films he was raised by Odin and Frigga and his main motivation is jealousy of Thor, though Loki doesn't go as far with his chaos as he does in the comics where he causes Ragnarok.

* [[ComicBook/ScarletWitch Wanda Maximoff]] gets a good deal of this. In the comics she’s a genuinely compassionate woman who was in her own words "held captive" by her father ComicBook/{{Magneto}} and ForcedIntoEvil. She happily heel turned and joined the Avengers at first opportunity when free of her his influence. In ''Film/AvengersAgeOfUltron'' and later MCU titles however Wanda is a much more [[DarkerAndEdgier cynical and dark character]] who will work for Baron Von Strucker and Ultron for sake of revenge and self preservation, Wanda does becomes more heroic like in the comics but she keeps her bitter and self-orientated personality up until ''Series/{{Wandavision}}'' [[spoiler: where it’s BeneathTheMask of her false cheerful personality]]. Granted Wanda does make poor and destructive decisions in comics as well see ''ComicBook/HouseOfM'' but in even then it’s mostly spurred on by the antagonism of others (e.g Magneto nearly killing [[ComicBook/{{Quicksilver}} Pietro]] in front of her) whilst MCU Wanda will [[AdaptationalJerkass willingly perform evil actions]] like MindRape completely of her own accord.

** ''Film/AntManAndTheWaspQuantumania'' does this to [[Characters/KangTheConqueror Kang the Conqueror]] to significant degree. In the comics Kang though possessing some NobleDemon qualities [[labelnote:example]] he never just uses TimeTravel to just wipe out the Avengers, [[ChallengeSeeker for the sake of giving them a fighting chance and himself more fun]] [[/labelnote]] is still very much a conceited {{jerkass}} MultiversalConqueror who has many misogynistic and “[[KickTheDog cruel for cruelty’s sake]]” moments — including holding a futuristic gun up to the pregnant belly of Jessica Jones. Much like Thanos and Doctor Doom comic Kang can also be disgustingly egotistical and petty. In the film however Kang is instead a sorrowful IDidWhatIHadToDo antagonist who takes no real satisfaction or pride in his butchering and even sheds many TenderTears over his deeds. Like in the comics, he’s still very threatening here as well as arrogant and cruel at times but definitely no where near as malevolent as he is on the page. [[spoiler:As revealed by TheStinger though this is just one version of Kang, the other variants are more traditionally diabolical.]]

* Steve Rogers aka Captain America is mostly the same as his [[ComicBook/CaptainAmerica comic book version]] but there are some key changes. MCU Steve is slightly more of a realist willingly to concede and even compromise [[WellIntentionedExtremist for the greater good]], whilst comic Steve is [[TheParagon adamantly idealistic]] and rarely wavers from his righteous attitude and beliefs. The Russo Brothers in particular [[WordOfGod intentionally]] made Cap quite the RoundedCharacter, he’s still a good man [[HeartIsAnAwesomePower with a pure heart]] who despises bullies, but unlike in the comics Steve isn’t above making some selfish decisions, perform morally questionable actions and [[IHatePastMe even gets annoyed at his younger idealistic self]] showing his CharacterDevelopment. It arguably finds a middle-ground between the IdealHero 616 Cap and his Ultimate version, who is a much more typical - and cynical - WW2 soldier.

* ComicBook/NickFury and [[Characters/SHIELDDirectors MariaH ill]] are far more likeable than their comic counterparts. While they’re not above withholding the truth and lying to their allies like on the page, they do genuinely believe and support the Avengers and superheroes in general. This differs from the comic where both Fury and Hill distrust Marvel’s heroes and will sometimes actively work against them.

* Steve Rogers aka Captain America is mostly the same as his [[ComicBook/CaptainAmerica comic book version]] but there are some key changes. MCU Steve is slightly more of a realist willingly to concede and even compromise [[WellIntentionedExtremist for the greater good]], whilst comic Steve is [[TheParagon adamantly idealistic]] and rarely wavers from his righteous attitude and beliefs. The Russo Brothers in particular [[WordOfGod intentionally]] made Cap quite the RoundedCharacter, he’s still a good man [[HeartIsAnAwesomePower with a pure heart]] who despises bullies, but unlike in the comics Steve isn’t above making some selfish decisions, perform morally questionable actions and [[IHatePastMe even gets annoyed at his younger idealistic self]] showing his CharacterDevelopment.

!!''Franchise/MarvelCinematicUniverse'':

Every hero in the universe has been altered to some degree, with the most consistent change being that none of them abide by the ThouShallNotKill trope, even the ones who ardently lived by it in the comics.

** ComicBook/NickFury and Maria Hill are far more likeable than their comic counterparts. While they’re not above withholding the truth and lying to their allies like on the page, they do genuinely believe and support the Avengers and superheroes in general. This differs from the comic where both Fury and Hill distrust Marvel’s heroes and will sometimes actively work against them.