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* Aftran does this in the ''Literature/{{Animorphs}}'' series, although she's actually an interesting example; we never saw her as a villain, she was just deeply in denial about how evil what she was doing was. Her claims to be a staunch supporter of Visser Three and the Yeerk Empire come across as trying to convince herself as much as anyone else, and ''even the person whose body she was controlling'' saw her more as an object of pity than hatred.
* ''Literature/ArtemisFowl'': Artemis' gradually becomes less of a [[AffablyEvil nice bad guy]] and more of a [[GoodIsNotNice bad nice guy]] with each passing book.
* ''Literature/TheBadGuys'' series:
** This is the main plotline of the series. The four main characters decide they're sick of being the bad guys (Mr. Wolf in earnest, the other three through convincing), and decide to become good. Unfortunately for them, they're not the best at it, but they slowly grow into the roles through the series.
** Legs is introduced post-Heel Face Turn, having turned to the heroes' side before his introduction via the encouraging of Mr. Wolf.
** The book "Superbad" reveals this was also the case for [[spoiler:The International League of Heroes, when they met each other and bonded through their troubles]].
* ''Literature/TheBelgariad'': In ''The Malloreon'', [[spoiler:Zakath. Over the course of the third and fourth book of the series, he goes from being the brutal monster he is initially depicted as in the ''Belgariad'', to a valued member of the group, and his friendship with Garion shows sign of bringing peace to the world finally.]] So long as they live long enough to do so.
* OlderThanFeudalism: Several instances from ''Literature/TheBible'':
** A literal version with Jacob in [[Literature/BookofGenesis Genesis]]. Jacob, whose name [[MeaningfulName literally means 'heel']] starts off as a [[GuileHero liar]] and [[UnscrupulousHero thief]] who steals both his brother's birthright and his father-in-law's property, running away instead of facing the consequences of his actions. In Genesis 32, he finally takes responsibility and confronts his past by going to meet his brother. Right before the meeting, he wrestles God (or an angel), wins, and [[MeaningfulRename receives the name Israel]]. And he calls the place where this happens "Peniel", which means "Face of God".
** Implied with the thief that was crucified next to UsefulNotes/{{Jesus}} according to the [[Literature/TheFourGospels Gospel of Luke]]. He asked Jesus for forgiveness for his sins, and received it.
** ''Literature/ActsOfTheApostles'': Saul who persecuted Christians until he had a vision from God and became one of the most influential Christians himself under the name of Paul the Apostle. Hence, in German, ''De/{{vom Saulus zum Paulus}}'' ("from Saul to Paul") is a common figure of speech for a Heel Face Turn, naming this very trope on the German language TV Tropes.
* The first few ''Literature/{{Bounders}}'' books feature the cruel bully Regis, who is finally kicked out of Earth Force after he makes two attempts on Jasper and Mira's lives in ''The Tundra Trials''. When Jasper and Regis meet again in ''The Heroes Return'', Regis explains that Waters taught him coping mechanisms for the behavioral issues that previously led him to act out violently, and he is now [[spoiler:a trusted member of LaResistance]].
* ''Literature/CharlieAndTheChocolateFactory'': After Mike Teavee gets shrunk his parents fret over how he can possibly live a normal life at his new tiny size. When Mike nonchalantly points out that he can still watch television, Mr. and Mrs. Teavee finally realize how harmful their sons obsession has become and so they vow to throw away their television set as soon as they return home.
* Ebenezer Scrooge becoming reformed by his experiences is the plot of ''Literature/AChristmasCarol''.
* Happens twice in ''Literature/TheChroniclesOfNarnia'':
** In ''Literature/TheLionTheWitchAndTheWardrobe'', Edmund Pevensie starts out as a self-centered brat who is easily manipulated to side with the White Witch against the Narnians and his own siblings. Later, when he is forced to see (and suffer) her cruelty, he takes the first opportunity to switch sides.
** Eustace Clarence Scrubb in ''Literature/TheVoyageOfTheDawnTreader'' starts out a [[SmallNameBigEgo peevish, arrogant, intellectual and emotional bully]], but eventually comes to see the error of his ways.
* Hans Ebert in ''Literature/ChungKuo'', after having lost everything, does some serious soul searching and changes his ways.
* In Jeramey Kraatz's ''Literature/TheCloakSociety'' novel ''Fall of Heroes'', Shade tells Alex that the Cloak members not posing as heroes now will fake this to join them; reformed villains are popular.
* ''Literature/DiaryOfAWimpyKidTheLastStraw'': Lenwood Heath was the biggest troublemaker in the Heffley's neighborhood, and Frank's biggest enemy. His enrollment at Spag Union changed him for the better, leading Frank to consider sending Greg there.
* Falk of ''Literature/TheDinosaurLords'', who's never publicly outed as a villain, gradually grows to respect his enemy and realizes that they're [[DividedWeFall all in this together]], eventually switching gears to be honestly on Jaume's side.
* Cawti in the ''[[Literature/{{Dragaera}} Vlad Taltos]]'' books did the exact same thing with the title character, beating Mara Jade in that she actually did kill him once, but his friends had him resurrected.
* ''Literature/TheDresdenFiles'':
** Harry Dresden refers this as the 'Vader Effect'. He is accused of it himself on several occasions, most notably when he [[spoiler:joins the Wardens, the quasi-military magical police who have been on his back since his youth]] despite not actually changing sides. More specifically, the 'Vader Effect' is that feared enemies make great allies, because you know exactly how scary they are to the other guy. It's a natural extension of the expression "glad you're on our side".
** As part of his backstory, Sanya, a large black Russian, in his youth took up a coin containing a FallenAngel within, granting him power and what he presumed was the affections of the woman who drew him in. Upon learning [[ExactEavesdropping she doesn't love him and sees him as a disposable pawn]], he leaves and finds himself truly regretting his actions. This causes him to purge the demon from within and he drops the coin into a river. Soon after, a [[ThePaladin Knight of the Cross]] finds him and offers him a job, to join them and help bring more bad guys to their redemption. Sanya is know wielder of the Sword of Hope.
** A far more dramatic instance is when [[spoiler:Lasciel's shadow image, or Lash, is convinced by Harry that she has free will of her own and "dies" saving Harry's life.]]
** In ''Changes'' it is revealed [[spoiler:Martin, the most bland person]] is a spy for the Red Court of Vampires sent on a long run mission to destroy their enemy, the order of St. Giles. However, while there [[spoiler:he saw the actions of his beloved king in a new light, and that the king truly is a monster that needs to be destroyed at any cost. He sets things up so well that by the end of the book, he gets Harry in a position to destroy ''all'' of the Red Court]].
* [[spoiler: Twigleg,]] in ''Literature/DragonRider''. Working as a spy for the villain, he comes to genuinely like the hero and [[spoiler: decides to switch sides.]]
* In Creator/FredSaberhagen's trilogy ''Literature/EmpireOfTheEast'', Lord Chup served the evil [[TheEmpire Empire of the title]] faithfully ... '''until''' one of its warlords demanded: "You must be for once not brave, but cowardly.... It will be difficult only once. You must learn to cause pain, for the sake of nothing but causing pain. Only thus will you be bound to us entirely." [[spoiler:Then he killed off a major demon, turning the tide of a critical battle.]] His Heel-Face Turn actually takes up the entire second book of the trilogy (''The Black Mountains'') [[spoiler:and he goes on to become a major hero on the rebel side]].
* Kavi in the ''Literature/FarsalaTrilogy''.
* In G.K. Chesterton's ''Literature/FatherBrown'' stories, the GentlemanThief Flambeau eventually turns over a new leaf under the good Father's influence, and even puts his colorful past to good use as a private detective.
* In ''Literature/FusionFire'', Tel Tellai slowly turns from blind adherence to Phoena Angelo and aristocratic Netaian ideas about who is worthy to live to a genuinely NiceGuy who wants to work to reform the moral failings in the Netaian system.
* ''Literature/Gameknight999'': [=Gameknight999=] starts out as a notorious griefer who ruins the game for his personal amusement, [[ReformedBully but soon becomes a selfless hero]].
* Michael Grant's ''Literature/{{Gone}}'' series: Caine does this at the end of ''Hunger'', either because Diana was bleeding out and she needed Lana to live, or because he realized how bad the Gaiaphage is.
* ''Literature/TheGreatGreeneHeist'': Wilton starts out as Keith's crony in bullying people and trying to steal the student council election. However, he gradually gets fed up with how paranoid and demanding Keith is and tells him to do his own dirty work.
--> '''Keith:''' You're supposed to be my right-hand man.
--> '''Wilton:''' No, I'm supposed to be your treasurer, but maybe I'll be Gaby's.
* There are quite a number of turns in the ''Literature/HarryPotter'' series:
** [[spoiler:Severus Snape before the start of the books, becoming a double (later triple) agent for Dumbledore.]]
** The Malfoy family make a rather big one towards the end of the series; Narcissa makes the biggest change when she [[spoiler:lies to Voldemort that Harry is dead so she can go into the castle and see if her son is alive. By doing this she saves the battle for the good guys]]. Her husband Lucius has quite a similar turn although he is not as active in his turn as Narcissa. Draco Malfoy's turn happens gradually in the sixth book when he is given a mission by Voldemort to [[spoiler: kill Albus Dumbledore]]. At first he's extremely full of himself but as the year goes on, he buckles under the pressure when he realizes that failure means his death. [[spoiler: Dumbledore offers him a chance to officially make the turn and he begins to]] before he is interrupted. He makes another Face Heel turn in the final book but is reunited with his family. In the epilogue [[spoiler: he and Harry appear to have abandoned their differences for good, although WordOfGod says that they are "not friends"]].
** Regulus Black, Sirius Black's brother, joined the Death Eaters willingly but after Voldemort [[spoiler:almost kills his house elf]], Regulus realizes what Voldemort is capable of and begins to have second thoughts. [[spoiler: He finally [[HeroicSacrifice dies]] in an attempt to steal and destroy one of Voldemort's [[SoulJar Horcruxes]]]]
** Kreacher pulls a mild one in ''[[Literature/HarryPotterAndTheDeathlyHallows Deathly Hallows]]'' after reciprocating all of Harry and Hermione's attempts at kindness with cruelty and hatred once he learns Harry is on the same quest [[spoiler: Master Regulus was on, and died for, he warms up considerably. It also helps that Harry gave him the chance to hunt down Mundungus for stealing from "the most noble house of Black". He still never shows any remorse for his part in orchestrating Sirius' death or taunting him to the point of near SanitySlippage while he was locked up in the same house in ''[[Literature/HarryPotterAndTheOrderOfThePhoenix Order of the Phoenix]]''.]]
** Gellert Grindelwald has a small role but makes the turn anyway. As a child he had a friendship with Dumbledore but he eventually became an all powerful Dark Wizard until Dumbledore defeated him in a duel and he was imprisoned for the rest of his life. In the final book Voldemort attempts to get information from him about the whereabouts of the Elder Wand (he was the Wand's previous master) but he refuses to tell and is killed on the spot. Later Dumbledore remarks that some people said he felt remorse for what he had done.
** To a lesser extent, so does Dumbledore himself. While in love with Grindelwald he enthusiastically accepts his Wizarding supremacist views, and only rejects them when they fall out.
** Dudley Dursley pulls one offscreen at the beginning of the fifth book after Harry saves him from some Dementors. Harry himself doesn't learn about the turn until the beginning of the final book. WordOfGod states they remain on Christmas card terms in their adulthood.
* At the end of the ''ComicBook/{{Hellboy}}'' novel ''Emerald Hell'', [[BigBad Brother Jester]] [[spoiler: is given back his humanity via [[ItMakesSenseInContext the piece of his shadow that was cut off]] and Hellboy says to him "Go and try to sin no more"]], keeping with the Christian themes present through out the story (as it takes place in the DeepSouth around Enigma, Georgia). Brother Jester then leaves and tries to make good on both his promise and the good guys' mercy.
* Both of Lyra's parents in the ''Literature/HisDarkMaterials'' Series.
** Her mother worked for the Magistrum but ultimately her motivation shifted to keeping Lyra safe and [[spoiler: helps defeat the BigBad.]]
** Her father starts off as a mad man who kills one of Lyra's friends but who can stay mad at a child-murderer fighting to free the multiverse from tyrannical spiritual (and sexual) oppression?
* ''Literature/HonorHarrington'':
** Many of the prominent Havenites from the later books were ''never'' precisely in the CardCarryingVillain category (almost all of them were [[PunchClockVillain Punch-Clock Villains]]), but Amos Parnell shows up as the Havenite Chief Naval Officer (which is ExactlyWhatItSaysOnTheTin), at the end of ''The Short Victorious War'' is used as a SacrificialLion by [[MeaningfulName Rob S. Pierre]] and ''five books later'' reappears in ''Echoes of Honor'' as a PoliticalPrisoner. He defects to the Manticoran Alliance side when Honor escapes the prison planet that all of them are imprisoned on.
** Haven itself pulls one off in Manticore's eyes after Manticore has just suffered a catastrophic sneak attack and the news that a massive Solarian fleet is coming to attack the Manticore system. Haven's President Eloise Pritchart -- who knows about both the attack and the incoming Solarian fleet, courtesy of Honor Harrington -- shows up with the core of her Cabinet and brand-new intelligence revealing [[AncientConspiracy who has been responsible for many of the problems Manticore and Haven have faced]], an offer not merely of a peace treaty (which was in the process of being negotiated) to finally end the war but one of a full ''military alliance'', and a few hundred warships to help defend Manticore. Queen Elizabeth takes her up on all three.
* In ''Literature/TheHost2008'' Wanderer's joining the side of the humans. [[spoiler: She is not alone in this; other souls like Sunny and Burns do the same.]]
* The Grinch at the end of ''Literature/HowTheGrinchStoleChristmas''.
* ''Literature/TheHungerGames'': [[spoiler:Effie.]]
* Wulfgar, in ''[[Literature/TheIcewindDaleTrilogy The Crystal Shard]]''. The Reghedmen barbarians collectively attack the Ten Towns and are defeated by their militias led by [[BreakoutCharacter Drizzt Do'Urden]] and Bruenor Battlehammer. Bruenor captures Wulfgar, barely more than a boy, and sets him to work in his forge. Ten years later, Wulfgar becomes the protagonist (of ''that'' book, at least).
* This tends to happen in some Indonesian literature (Mostly KKPK, short for Kecil Kecil Punya Karya or 'Little Kids Who Creates') written by children. The thing that irritates is that in ''nearly every single one'' of the books that plays this trope straight, the rich, snobby AlphaBitch (Always the Alpha Bitch, no exceptions) ''will'' turn good halfway through the story due to some event, and will instantly and melodramatically apologize to the hero, who instantly forgives her without any doubts whatsoever, despite the fact that they had been fighting since the first day of school. If not her, then it's her GirlPosse who will turn their backs at her because they haven't realized until today about how perfect, nice, religious, smart, etc the heroes are. Afterwards, the Alpha Bitches join the hero's group and have adventures like nothing has ever happened between them.
* ''Literature/TheInfernalDevices''
** [[spoiler:Gabriel Lightwood stops supporting his father after his father is turned into a demon by the demon pox.]]
* ''Literature/TheLastDaysOfKrypton:'' No-Ton starts out as a loyal recruit for Zod's Ring of Strength, impassively watching [[spoiler:Vor-On]] get ThrownFromTheZeppelin. However, when Zod decides to [[spoiler:destroy Borga City]], No-Ton tips off Jor-EL so he can warn people and try to change Zod's mind. When Zod [[spoiler:destroys Borga City anyway]], No-Ton is described as "moving ponderously, as if weary beyond description." He then begins resisting Zod in other small ways offscreen before joining the government that replaces Zod.
* ''Literature/LegacyOfTheDragokin'':
** [[spoiler: Kthonia]] did this pre-series but seeing her daughter killed in front of her by a man leads to a FaceHeelTurn.
** [[spoiler: Becoming Benji's auntie mellowed Zarracka out.]] Not only does she help in the fight against Kthonia without a devious agenda but she volunteers to go back to her cell when it's over.
* Inspector Javert in ''Literature/LesMiserables'', whose world view explodes with the sudden realization that Jean Valjean is simultaneously a criminal and a good guy. To let Valjean go free would be unlawful, while arresting him would be immoral. Javert removes the problem [[TakeAThirdOption by removing himself from the problem]]. He drowns himself in the river Seine.
* In Sam Gayton's novel ''Lilliput'', [[spoiler:Gulliver, who originally kidnaps Lily, eventually dies to set her free.]]
* Wolf and Jacin from ''Literature/TheLunarChronicles'' perform this.
** [[spoiler: Wolf was a Lunar Special Operative tasked to find Scarlet so information could be gleaned from her about Princess Selene. However, he bonded with her on their trip to Paris while pretending to be helpful out of kindness. He changed sides for real when he saved her life before his brother tried to kill her. It helps that he never really like being a Special Operative, anyways.]]
** [[spoiler: Jacin was initially a HeelFaceRevolvingDoor, but decided that being a hero [[HeroicNeutral would be the best side for protecting]] [[ChildhoodFriendRomance Winter.]]]]
* ''[[Literature/AMagespower A Mage's Power]]'': After [[spoiler: Duke Esrah's plot]] leads to Kasile being locked up in her own dungeon, [[spoiler: Siron]] decides that enough is enough and frees her.
* In the ''Literature/MalazanBookOfTheFallen'' Karsa Orlong starts out as unambiguously villainous. Even at the end of his character arc he is far from entirely sympathetic, but arguably becomes either an AntiVillain or a dark AntiHero. Some of this is arguably due to the narrative setting him against people who are unambiguously more villainous ({{Pedophile Priest}}s, slavers, etc.), but some of it is due to CharacterDevelopment, as his internal narrative makes it plain that he is re-examining the core beliefs that shaped him into the villain he was initially.
* ''Literature/MaximumRide'':
** Ari becomes good after breaking [[TrueCompanions the Flock]] out of The School in ''Saving The World and Other Extreme Sports''. Sadly, not long after this, he expires and dies. The Flock and Jeb hold a funeral for him.
** Also Maya/Max 2. she starts out as an evil clone and later becomes a part of Fang's Gang.
* ''Literature/TheMazeRunner'':
** [[spoiler:Gally turns from being Thomas' adversary into steadfast helper in after he escapes from WICKED's custody and joins the Right Arm. It seems that this in part fueled by [[TheAtoner his regret for being directed to kill Chuck]]]].
** [[spoiler:Ava Paige, who realizes the errors of her ways and the fact that no cure for the Flare virus will ever be found. She decides to become a BigGood and gets Thomas and the Immunes to head for the paradise she has prepared for them, free from the Flare virus]].
* Downplayed in ''Literature/{{Montmorency}}''. The titular character starts out as a liar, thief, almost a con-man, but by the end of the first book he's [[spoiler:happily working for the British government, alongside Fox-Selwyn.]] However, he's ''still'' a thief with the alias of Scarper, he's just got better motives now.
* Charles Dickens' ''Literature/OliverTwist'': Sympathetic heel Nancy, a prostitute who by default was a villain for her relationship with brutal criminal Bill Sykes, and at first enjoys her life. Nancy begins to turn after forming a relationship with the title character, a young street orphan who is kidnapped to be part of a band of pickpockets in London. Eventually, due to her desire to see Oliver become a respectable person, she decides to try to return Oliver to [[spoiler:his family]], but Bill brutally kills her before she can do more than give a few hints as to his location.
* ''[[Literature/OrigamiYoda Origami Yoda]]'': [[spoiler: Harvey at the end of the 2nd book. He decides to stop antagonizing Dwight.]]
* In Creator/LJagiLamplighter's ''Literature/ProsperosDaughter'', Miranda's Lady's aim is this, on a ''large'' scale. [[spoiler: In ''Prospero Regained'', we learn of how Prospero's plans also center about it.]]
* In the ''Literature/RainbowMagic'' series, a goblin in Sophia the Snow Swan Fairy's book does this, and Lydia does this in the movie.
* ''Literature/{{Ratburger}}'': [[spoiler: At the end, the bully Tina Trotts apologizes and stops being mean to Zoe.]]
* Creator/DamonRunyon's characters are often a brutal bunch, but they occasionally slip into virtue.
** In "Johnny One-Eye", a mortally wounded gangster makes friends with a mortally wounded kitten, and decides to do some good at the end of his life.
** The title character of "Earthquake" pulls off an HeroicSacrifice to save the occupants of an orphanage.
* ''Literature/SergeStorms'':
** In ''Pineapple Grenade'', Ted Savage is introduced as a CIA agent stirring up guerillas to destabilize an honest South American president (indirectly on behalf of {{Corrupt Corporate Executive}}s) but goes on to help Serge protect the president from an assassin after feeling betrayed by his handlers, and seems invested in his new mission.
** In ''The Pope of Palm Beach'', a group of {{Dirty Cop}}s are outraged enough by the murder of a ManOfTheCity and two of their colleagues to kill the cartel goons responsible and then work to protect a witness to the crime rather than try to kill him and steal the millions of dollars he ended up instinctively taking from the crime scene.
** In ''No Sunscreen for the Dead'', NewAgeRetroHippie Tofer Baez was a high-profile Soviet spy for much of the Cold War. However, he has come to acknowledge the worst aspects of the Russian government and would have quit before the end of the Cold War if he wasn't being blackmailed. When old Russian contacts still in America start being murdered, he sets out to warn people who he had manipulated into giving information that they may be in danger as well and assists Serge and various other guest characters in the climactic shootout.
** At the beginning of ''Tropic of Stupid'', Nathan Sparrow is an ambulance-chasing workaholic lawyer and fundraiser for slimy politicians. The sudden death of his ParentalSubstitute and a disgruntled client trying to ruin Nathan's daughter's career makes Nathan reevaluate his life. He quits his job, makes restitution to people he has wronged, destroys the career of the man who went after his daughter, and takes up a CallToAgriculture.
** In ''Mermaid Confidential'', cartel member Mercado inserts himself into the life of hospice worker Julie to provide for her and her patients to atone for the one time he personally killed someone (a BadassBystander near a botched drug deal).
* Garyl Shadowslayer from ''Shadowslayers'' pulled a heel-face turn at some point in his backstory, going from killing his mother and brother to risking his life to save the realm of Blackwood.
* {{Invoked}} in ''Literature/TheShepherdsCrown'' when Tiffany decides to give the [[TheFairFolk elf]] Nightshade [[spoiler:(the former queen of the elves)]] a chance to learn about being human and helping others in hopes of bringing her around. [[spoiler: It works... but she doesn't live long after proposing these ideas to the other [[AlwaysChaoticEvil elves]].]]
* Attorney Arcinas in ''Literature/SmallerAndSmallerCircles'', who goes from stonewalling the priests to helping them after he screws up badly by arresting an innocent man for the Payatas murders and indirectly allowing another murder to occur.
* ''Literature/{{Somewhither}}'': Nakasu the Blemmye goes from trying to devour Ilya to aiding him, in thanks for setting him free (and, in part, because he enjoys seeing the Dark Tower's schemes unravel.)
* Jaime Lannister from ''Literature/ASongOfIceAndFire''. His turn is a drawn-out, bitter process.
* The Staryk King in ''Literature/SpinningSilver''. From his point of view, HumansAreTheRealMonsters because they plopped a fire demon onto the tsar's throne and there's nothing wrong with creating an EndlessWinter that destroys the kingdom along with the tsar. When Miryem tells that they had ''no idea'' that the tsar was possessed and they would have killed him themselves if they knew, the King becomes much more willing to work with them. He also gains a genuine sense of respect for humanity in his dealings with Miryem and agrees to halt the Staryk's brutal raids against human settlements (which they did ''prior'' to the tsar's ascendance and therefore didn't have an excuse for).
* Angelina is the brilliant, beautiful, and psychopathic villainess of ''Literature/TheStainlessSteelRat''. After she is captured and the psych-techs have worked on her, she marries the hero and becomes an agent of the Special Corp who doesn't enjoy killing. As much.
* Twice in ''Literature/TheStanleyFamily'' series. In ''The Famous Stanley Kidnapping Case'', two of the kidnappers pull this and end up turning on their boss. In ''Janie's Private Eyes'', former bully Pete Garvey, who is friends with the dog thieves, turns them into the police once he sees they're putting the Stanley family in danger.
* Played with twice in ''Literature/StarTrekStargazer''. In "Enigma", ObstructiveBureaucrat Admiral [=McAteer=] seems to defrost into a JerkWithAHeartOfGold. After a dangerous mission alongside Commander Gilaad ben Zoma, he appears to make a peace offering and reveal a more understanding side to his character. However, it transpires he was merely trying to manipulate ben Zoma. In ''Maker'', murderous super-powered alien Brakmaktin also appears to be reconsidering his former conduct and having an epiphany. It turns out it was just him screwing with his captive.
* ''Franchise/StarWarsLegends'':
** Mara Jade went from wanting to kill Luke to marrying him. That makes her Heel Face Turn ''queen''.
** Lara Notsil a.k.a. Gara Petothel of the ''Literature/XWingSeries'', who starts as TheMole. She ends up falling in love one of her "enemies" and growing affection for her squadron, causing her to turn on her Imperial commanders and greatly helping the Rebels defeat the ''Iron Fist''.
** [[spoiler: Guri from ''Literature/ShadowsoftheEmpire'', if in later works, decides not to be a killer anymore, desiring a normal, moral life (however, it's a bit different since everything bad she did was Xizor's fault, as she was programmed to obey him)]].
* ''Literature/StarWarsLostStars'':
** Thane Kyrell, of course, ever since the Death Star reduced Alderaan to smithereens, eventually deserting his post in the Imperial Navy and defecting to the Rebels.
** Kendy Idele also mutinied with most of her unit against the Empire on Miriatin, with the survivors joining the Rebel Alliance.
* In Heather Tomlinson's ''The Swan Maiden'', Doucette's sisters are cruel to her because she has no magic. [[spoiler: When she discovers that she has magic, her sister Cecilia has one of these toward her, even though Doucette is now her rival.]]
* [[spoiler: Lady Lejean]] in Creator/TerryPratchett's ''Literature/ThiefOfTime'' rejects [[spoiler: her nature as an Auditor]] completely in the end.
* In the sequel to ''Literature/ThoseThatWake'', Arielle Kliest is fine wit torturing Mal and threatening him to get what the Old Man wants--but when she sees the totality of his plan, which involves assimilating every mind on earth, she's horrified and betrays him.
* ''Literature/TransformersDarkOfTheMoon'': "I... am tired of fighting. I sue for peace, Optimus."
* ''Literature/TrappedOnDraconica'': The NobleDemon [[spoiler: Taurok]] joins the heroes in the final act to overthrow the EvilOverlord.
* Mia Rinaldi is a minor villain in the first book of ''Literature/VampireAcademy''. [[spoiler:After her mom dies]], she becomes much nicer.
* ''Literature/VillainsByNecessity'': Robin and, before the start of the book, [[spoiler:Blackmail]], for certain values of "heel" and "face." Both started on the Good side, but realized their compatriots were misguided fanatics inadvertently destroying the world, so they joined the villains saving it.
* Dolokhov in ''Literature/WarAndPeace'' goes from being a ManipulativeBastard of a Humphrey, something of a minor antagonist, to the [[TheLancer trusted lieutenant]] of Vaska Denisov as the Russians chase the retreating French. He is still the same amoral asshole as usual (witness his reaction to [[spoiler:the death of the little Rostov]]) -- he is just putting is evil badassery to a good use.
* ''Literature/TheWheelOfTime'': [[spoiler:Ingtar, Asmodean, and Verin]], amongst others. [[spoiler:Fans have debated whether Asmodean's HeelFaceTurn was genuine because Rand and Lanfear left him with little other choice, but WordOfGod has confirmed that it was. Verin [[GoodAllAlong may not count]] because she only swore an oath to the Black Ajah to escape death and study them from the inside, and appears to have intended to be TheMole from the beginning. Ingtar's example is played straight.]]
* In ''Literature/{{Worm}}'', [[spoiler:Bonesaw]], considered one of the worst villains and a creator of [[AndIMustScream terrifying]] BodyHorror, undergoes one, though she's not remotely trusted, and in constant danger of backsliding even though she does want to change.
** As of the sequel ''Literature/{{Ward}}'' it appears to have stuck.

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