History AdaptationPersonalityChange / DCExtendedUniverse

** ComicBook/TheJoker is better off mentally and morally in the film. In the comics he's a ChaoticEvil MonsterClown who abuses Harley, in the film, he's just a somewhat AxCrazy mafia boss who does genuinely care for Harley and even rescues her. ''Film/BirdsOfPrey2020'' corrects this decidedly stating Joker is a vicious boyfriend to Harley who soon leaves him, but in the comics Joker is known to stalk [[EntitledToHaveYou obsess over]] Harley even if she cuts ties with him, while he apparently just gives up on her in the film. ''Film/ZackSnydersJusticeLeague'' [[PlayedWith flips it again]] as during the BadFuture segment, Joker while still unpleasant is shown to be a RetiredMonster and TheAtoner who has a shaky truce with Batman, which is actually genuine. In the comics and most media the Joker usually goes back to trying to kill/hurt Batman after the EnemyMine ends.

** Orm is more a TragicVillain whose motivations and anger towards Arthur are [[EvenBadMenLoveTheirMamas due their mother Atlanna]] being banished by his father due giving birth to Arthur out of marriage. In comics he is a racist tyrant who even when working with the heroes, still tries to seize the throne at first opportunity. Also in the comics Orm hates Arthur while he has some level of VillainRespect and brotherly care for him in the movie.

* In the comics, both Superman and his adopted father Jonathan Kent are very idealistic and optimistic people, hoping for the best in people. In this universe, Jonathan was pretty paranoid because of Clark's origins as an alien and felt TheWorldIsNotReady for Clark. As a result of this and constantly being a HeroWithBadPublicity despite his efforts, this version of Clark is also more reserved and melancholic, suffering feelings of alienation, sensory overload and survivor's guilt. [[spoiler: Superman's personality is significantly realigned in both versions of ''Justice League'' in order to bring him more in line with his classic portrayal, as part of the intended arc to have him grow into the role.]]
** General Zod in the comics and previous films was a straight-up villain, a War Criminal who attempted a coup prior to Krypton's destruction before being sent to the Phantom Zone, wishes to kill Superman simply for being the son of his old friend Jor-El (who he blames for his banishment). ''Film/ManOfSteel'', [[AntiVillain however, expands on his motivation]], having him attempt his coup because Krypton is dying and he blames the rulers for it, [[WellIntentionedExtremist and his attempted conquering of Earth being so he could preserve his now-near extinct species]].

* Comicbook/LexLuthor is ''very'' different than the comic version, being portrayed as a sort of PsychopathicManchild; apparently the idea was to modernize him as an eccentric young tech billionaire, but most fans find him much less threatening than the usually calm, {{Stoic}} that he is in most modern adaptations.
* Much like in [[Film/Batman1989 Tim Burton's film]] (and [[Film/TheDarkKnightTrilogy Chris Nolan's reimagined series]], however much the titluar character says otherwise), Batman is more open to the idea of lethal force, albeit against mercenaries rather than mentally ill people. This version for a time also branded rapists and human traffickers for other criminals to target. However, he begins to undergo CharacterDevelopment that sees him backing off these more extreme methods and becoming closer to his comic counterpart. Superman's resurrection via the Genesis Chamber and a Mother Box in ''Film/{{Justice|League 2017}} [[Film/ZackSnydersJusticeLeague League]]'' is something Bruce decided, as opposed to his traditional opposition to the use of the Lazarus Pit in the comics, though it's also implied that it was also motivated by guilt over his actions against Superman in ''[=BvS=]''.
* In the comics Barry Allen/The Flash is an enthusiastic-yet-humorless dork. Here he's still a dork, but he also has the DeadpanSnarker trait that's typically associated with his successor Wally West.
* ComicBook/{{Aquaman}} is a HotBlooded BoisterousBruiser, not unlike his ''[[WesternAnimation/BatmanTheBraveAndTheBold The Brave and the Bold]]'' counterpart.
* Cyborg is far more stoic than most portrayals of him, the ReCut made him more lighthearted similar to his ''Teen Titans'' personality. The Snyder Cut clarifies that this was part of his character arc and it's implied in the epilogue that he would be much more upbeat if he ever made a future appearance.
* Steppenwolf in the comics (and the theatrical cut of ''Justice League'') is little more than a BloodKnight who is audacious enough to tell Darkseid he doesn't think that highly of him despite being one of his trusted enforcers. In the Snyder Cut it's mentioned that he was initally part of a coup against Darkseid and has long since repented for his crimes. He also doesn't seem to get much joy out of conquering planets unless he's fighting someone like Wonder Woman.

** ComicBook/HarleyQuinn while she's steadily become more heroic in [[CharacterisationMarchesOn recent years]] is still a unstable PsychopathicWomanchild who too eagerly dispenses DisproportionateRetribution to anyone she takes issue with. In ''Suicide Squad'', ''Birds of Prey'' and ''The Suicide Squad'' she's mainly just childish and only becomes violent in self-defence or to protect people she likes. She also has [[TheLeader leadership qualities]] in her second film outing, which she happily lacks in the comics.

** [[spoiler:Ares]] is a WellIntentionedExtremist as he views humanity as destructive and thinks wiping it out would help the world. Additionally, he's more AffablyEvil toward Wonder Woman even after TheReveal.
** [[ComicBook/WonderWoman Diana]] herself is far more naive than she was first presented as in the [[UsefulNotes/TheGoldenAgeOfComicBooks Golden Age]] or most modern depictions, being a complete FishOutOfWater. She's also a CompositeCharacter of her previous and current portrayals, like early continuity she's compassionate and idealistic, but she's also more than [[BloodKnight willingly]] to use lethal force like she is in [[ComicBook/New52 modern]] [[ComicBook/DCRebirth continuity]].

** Doctor Sivana is an unrepentant MadScientist in the comics, in film he's an incredibly sympathetic TragicVillain who has suffered great abuse from his father and brother and corrupted by the Seven Deadly Sins.
** Billy himself is a CompositeCharacter of his idealistic Golden Age self and the AdaptationalJerkass of his ComicBook/New52 version. He's not a saint but still a good kid at heart.

** Peacemaker while still a KnightTemplar is much more humorous and even crude in his attitude compared to the serious AxCrazy vigilante with BlackAndWhiteInsanity from the comics. He's not as much TheUnfettered [[spoiler: as when forced to fight and kill Rick Flag and then attempt to kill Ratcatcher II as well under Waller's orders to keep Project Starfish secret, he shows genuine regret and hesitation especially with the latter, unlike his comic counterpart who kills without a second thought.]]

* ''Film/SuicideSquad'':

** ComicBook/{{Mera}} is a prominent FieryRedhead in the comics whose temper allowed her to join the Red Lanterns, in ''Justice League'' and ''Aquaman'' she’s very calm even in the face of her LoveInterest Arthur’s idiocy and recklessness. She does get angry at him on few occasions but it’s not to the HairTriggerTemper levels of her comic version who’s quite a [[ClingyJealousGirl clingy wife]] at times.

** Rick Flag is TruerToTheText compared to the 2016 film, being a FatherToHisMen and pretty much TheParagon of the team. [[spoiler: He’s also unwilling to be a lapdog of his country as upon discovering America’s involvement in Project Starfish, he betrays Waller and wants to make sure the world knows what atrocities took place.]]

** Rick Flag is TruerToTheText compared to the 2016 film, being a FatherToHisMen and pretty much TheParagon of the team. [[spoiler: He’s also unwillingly to be a lapdog of his country as upon discovering America’s involvement in Project Starfish, he betrays Waller and wants to make sure the world knows what atrocities took place.]]

** Harley Quinn compared to the 2016 film, is much moral and loyal to the team. As seen when she shoots Silvio Luna when talks about murdering women and children, in contrast to her first film where she was an accomplice to Joker in the death of Robin. Although this likely due to her better qualities and character arc from ''Birds of Prey'' being carried over into this film.

* Comicbook/LexLuthor is ''very'' different than the comic version, being portrayed as a sort of PsychopathicManchild; apparently the idea was to modernize him as an eccentric young tech billionaire, but most fans find him much less threatening than the [[BerserkButton usually]] calm, {{Stoic}} that he is in most modern adaptations.

** Zsasz in the film is a incredibly loyal and illiterate henchmen of Sionis who shows a bit of of his sadism now and then. Comic Zsasz is, [[UpToEleven far, far worse]] being a horrific killer even by the standards of Batman’s RoguesGallery. Unlike the film, comic Zsasz is very intelligent albeit maliciously so.

** [[ComicBook/Batgirl2000 Cassandra Cain]] is a solemn and highly trained TykeBomb who’s generally compassionate and righteous when not beating the snot out of criminals. The movie version is a BrattyHalfPint street kid who’s quite sarcastic, she’s also not mute like in the comics.

* In the comics, both Superman and his adopted father Jonathan Kent are very idealistic and optimistic people, hoping for the best in people. In this universe, Jonathan was pretty paranoid because of Clark's origins as an alien and felt TheWorldIsNotReady for Clark. As a result of this and constantly being a HeroWithBadPublicity despite his efforts, this version of Clark is also more angsty and brooding, suffering feelings of alienation, sensory overload and survivor's guilt. [[spoiler: In response to the negative reaction these changes garnered, Superman's personality is significantly realigned in both versions of ''Justice League'' in order to bring him more in line with his classic portrayal.]]

** Bloodsport is a largely two dimensional BigScaryBlackMan and PsychoForHire in the comics. In the film he’s a affable PunchClockVillain turned AntiHero who cares for his daughter as well as daughter surrogate Ratcatcher II and even decides to be a hero by the end of the movie. This is partly due to making Bloodsport a CompositeCharacter of Deadshot right down to the estranged daughter.

** Mary in most continuities is either a PluckyGirl or just upbeat, in the film she’s more mature, quiet and is depressed at the prospect of leaving her adoptive family. She’s also [[UnrelatedInTheAdaptation not Billy’s biological sister]] allowing for a ShipTease between them.

** Orm is more a TragicVillain whose motivations and anger towards Arthur are [[EvenBadMenLoveTheirMamas due their mother Atlanna]] being banished by his father due giving birth to Arthur out of marriage. In comics he is a racist tyrant who even when working with the heroes, still tries to seize the throne at first opportunity. Also in the comics Orm hates Arthur while he has some level VillainRespect and brotherly care for him in the movie.

** Doctor Sivana is a unrepentant MadScientist in the comics, in film he’s an incredibly sympathetic TragicVillain who has suffered great abuse from his father and brother and corrupted by the Seven Deadly Sins.

** Peacemaker while still a KnightTemplar is much more humorous and even crude in his attitude compared to the serious AxCrazy vigilante with BlackAndWhiteInsanity from the comics. He’s not as much TheUnfettered [[spoiler: As when forced to fight and kill Rick Flag and then attempt to kill Ratcatcher II as well under Waller’s orders to keep Project Starfish, he shows genuine regret and hesitation especially with the latter, unlike his comic counterpart who kills without a second thought.]]
** Harley Quinn compared to the 2016 film, is much moral and loyal to the team. As seen when she shoots Silvio Luna when talks about murdering women and children, in contrast to first film where she was an accomplice to Joker in the death of Robin. Although this likely due to her better qualities and character arc from ''Birds of Prey'' being carried over into this film.

** Polka-Dot man is a SmugSnake and BoisterousWeakling in the comics. In the film he’s very much TheWoobie, being deeply psychologically scarred thanks to his abusive MadScientist mother. He’s even capable of outright heroism unlike his often pathetic comic version.
** Nanaue aka King Shark is while bloodthirsty and savage is still intelligent in the comics able to speak and plot. In the film, he’s mainly got HulkSpeak although compared to the comic he’s more of a BruiserWithASoftCenter, especially around Ratcatcher II.

** [[ComicBook/WonderWoman Diana]] herself is far more naive than she was first present as in the [[UsefulNotes/TheGoldenAgeOfComicBooks Golden Age]] or most modern depictions, being a complete FishOutOfWater. She’s also CompositeCharacter of her previous and current portrayals, like early continuity she’s compassionate and idealistic, but she’s also more than [[BloodKnight willingly]] to use lethal force like she is in [[ComicBook/New52 modern]] [[ComicBook/DCRebirth continuity]].