History Main / LoveMakesYouEvil

* ''WesternAnimation/{{Amphibia}}'': Played with. It’s not love that turns [[spoiler: King Andrias]] evil, but rather, friendship. [[spoiler: He once had two incredibly close friends, those being Leif and Barrel. However, their friendship would be strained, as Leif would end up betraying Andrias by stealing the Calamity Box (she foresaw that it was bad news and wanted to prevent it from getting into the wrong hands). Barrel ends up siding with Leif and helps her get away. Completely devastated by the loss of the two people he could trust most, Andrias ultimately decided to follow through with his father’s plans to make him a tyrant.]]

** Harley Quinn, although listed above, did originate in the Franchise/DCAnimatedUniverse. She is shown to be a generally good (if crazy) person when on her own. Being in love with The Joker though brings her to all the depths one would expect.

* ''WesternAnimation/HarleyQuinn2019'': While Harley always had a repressed dark side, it was falling in love with Joker that drove her to embrace her murderous impulses and become a villainess. [[spoiler:Later, thinking she can't get Ivy because the latter already has Kite Man, Harley makes a deal with Darkseid and uses a Parademon army to massacre the people in Gotham, mostly just to distract herself from [[LoveHurts the pain]].]]

** This extends to the main villains as well; [[BigBad Hawk Moth]] wants the heroes' [[TransformationTrinket miraculouses]] in order to [[spoiler: undo the events that left his beloved wife comatose]], while [[TheDragon Mayura]] is driven by [[SubordinateExcuse her unrequited feelings for Hawk Moth]]. Even [[ConsummateLiar Lila Rossi]] falls into this -- [[EvilIsPetty her vendetta against Ladybug began because the heroine harshly humiliated her in front of her crush]] (the fact that Lila was not guiltless [[NeverMyFault slips her mind]]).

* ''WesternAnimation/RickAndMorty'': Morty Smith shows little concern for morality when he’s trying to court Jessica. To elaborate:

* Oroku Saki/The Shredder in ''WesternAnimation/TeenageMutantNinjaTurtles2012'' was in love with the same woman Hamato Yoshi/Splinter loved. When she chose Yoshi over Saki, he became jealous of Yoshi and came to hate him. His entire plan is to kill Splinter by using his long-lost daughter as a weapon.

* ''Franchise/{{Batman}}'':

* In ''ComicBook/SupergirlRebirth'' [[Characters/SupermanCyborgSuperman Cyborg-Superman]] does horrible, horrible things like turning corpses into reanimated, soulless zombie cyborgs and making human sacrifices. And everything -- ''everything'' -- he does is because he loves his daughter -- [[spoiler:Characters/{{Supergirl|TheCharacter}}]] -- and wants her to be happy. He says "I'm doing this for you!" over and again, and he means it.
* Inverted with [[Characters/MarvelComicsThanos Thanos]] of the Franchise/MarvelUniverse, who was evil from the very beginning (or best case, a NobleDemon), but through it found love in [[AnthropomorphicPersonification (the Lady Death) itself]]. However, their [[TheMasochismTango tumultuous relationship]] has been known to drive him [[LoveMakesYouCrazy crazy]] at times.

* Happens to both Comicbook/{{Aquaman}} and Martha Wayne in ''ComicBook/{{Flashpoint|DCComics}}''. Aquaman does this out of vengeance for his wife's murder at the hands of Wonder Woman, after his wife caught them in an affair. In Martha's especially tragic case, she bears witness to her son dying in her arms at the hand of the mugger who originally killed her and her husband. Unable to bear it, she [[SanitySlippage quickly]] goes from crying over their loss to [[LaughingMad manically laughing]] with her son's blood staining her face in a look reminiscent of the Joker. [[spoiler: Which she just so happens to become.]]

* Becomes a DiscussedTrope in ''Comicbook/MegaManArchieComics''. Agent Stern warns Dr. Light that giving his robots emotions is a ''really'' dumb idea because of this trope and gives some nice {{Foreshadowing}} of the ''VideoGame/MegaManX'' series in the process.
* ''Comicbook/TheMightyThor'':

* Ramona Flowers of ''Comicbook/ScottPilgrim'' has seven evil exes that the titular character must defeat, and in a few cases the ex-boyfriends have been hinted at as being not exactly evil to begin with, but turning evil after the inevitable breakup. [[spoiler:The same fate may befall Scott, as well.]]

* The Jackal's StartOfDarkness began with the death of Gwen Stacy. As Professor Miles Warren, he was secretly in love with his student, and could never get it out of his head that [[Characters/SpiderManPeterParker Spider-Man]] (who he later discovered was another of his students and her boyfriend) was more to blame than the Green Goblin was. (It should be noted that although Warren received the financial backing of [[Characters/MarvelComicsNormanOsborn Norman Osborn]], the true mastermind of Comicbook/TheCloneSaga, he was kept in the dark about his identity.) Indeed, he tried to recreate her with a clone of Gwen (dozens, actually, but only one shared Ben Reilly's apparent immunity to the degeneration factor). When the second Carrion (Malcolm [=McBride=]) appeared (with Warren still believed dead) Spidey called Warren "A sick man obsessed with a dead woman" in disgust. But even when revealed to be alive, he would never let Spidey forget it. In fact, in one of the last fights between them (when his consciousness was inside the body of a coroner who had turned himself into the third Carrion, in ''Spider-Man: Dead Man's Hand''), Spidey told him, "Still hung up on Gwen, huh? Some things never change."
* In the ''Comicbook/SquadronSupreme'' limited series, Golden Archer [[spoiler: brainwashes his girlfriend]] after she rejects his marriage proposal. Hyperion's [[EvilTwin extradimensional duplicate]] [[spoiler:murdered Zarda's husband]] after falling for her. Admittedly, this is more accurately an example of "Love Makes You ''More'' Evil Than You Were Already".
* In ''Comicbook/SupergirlRebirth'' [[Characters/SupermanCyborgSuperman Cyborg-Superman]] does horrible, horrible things like turning corpses into reanimated, soulless zombie cyborgs and making human sacrifices. And everything -- ''everything'' -- he does is because he loves his daughter -- [[spoiler:Characters/{{Supergirl|TheCharacter}}]] -- and wants her to be happy. He says "I'm doing this for you!" over and again, and he means it.

* In ''WebOriginal/MommySleepsInTheBasement'', Tom claims he loves Claire more than anyone else, but his twisted love for her led him to [[spoiler:abduct her, keep her locked in his basement for over a decade and impregnate her against her will. And it didn't stop him from killing her eventually, though he expresses regret over this]].

* [[spoiler: Jean Loring]]'s ultimate motivation in ''ComicBook/IdentityCrisis''. The "so we can be together" quote in the trope description is even repeated, almost verbatim, at TheReveal.

* Inverted in ''WesternAnimation/TheHunchbackOfNotreDame''. Frollo was clearly a holier-than-thou bastard who hates everyone except himself to begin with. And when he meets Esmaralda, he hates her as much as everyone else. However, he develops a lustful obsession that causes him to go to insane lengths to either make her his own or kill her if she refuses.

* ''WesternAnimation/DannyPhantom'' has Vlad Masters/Plasmius who tries to [[MurderTheHypotenuse murder his once best friend to obtain the woman he loves]], not to mention try and constantly MindRape Danny into being his surrogate son, later going as far as making a [[CloningBlues perfect clone]] of him. The ultimate irony is that in an alternate timeline, Vlad ends up marrying Maddie, but it's not a happy marriage due to the fact that he's a total {{control freak}}. What's more, Maddie ''still'' prefers Jack.

* Happens to both Comicbook/{{Aquaman}} and Martha Wayne in ''ComicBook/{{Flashpoint}}''. Aquaman does this out of vengeance for his wife's murder at the hands of Wonder Woman, after his wife caught them in an affair. In Martha's especially tragic case, she bears witness to her son dying in her arms at the hand of the mugger who originally killed her and her husband. Unable to bear it, she [[SanitySlippage quickly]] goes from crying over their loss to [[LaughingMad manically laughing]] with her son's blood staining her face in a look reminiscent of the Joker. [[spoiler: Which she just so happens to become.]]

** ComicBook/HarleyQuinn in the DCU. She was a psychiatrist at Arkham Asylum until she was assigned to ComicBook/TheJoker. Falling in love with him, she broke him out and joined him as his girl sidekick. To what degree the Joker returns her feelings is questionable, ranging from 1% to zero. However, almost all her evil acts are an attempt to secure his affection.

* Comicbook/BlackAdam in Franchise/TheDCU first turned to totalitarianism when his wife was killed while he was away. Eventually (as in thousands of years later) he started to reform, especially when he [[LoveRedeems fell in love again with Isis]] as seen during ''ComicBook/FiftyTwo''. [[spoiler:When Isis was murdered, he leveled an entire nation and took on every active superhero on Earth at once.]] Later he combined this trope and WithGreatPowerComesGreatInsanity. [[spoiler: When he resurrected Isis with a fraction of his power, she turned evil, ripped Captain Marvel from his powers, and wrought chaos in the world seeking revenge. Later in that same story Mary Marvel, corrupted with powers Black Adam gave her, threatens Billy's ex-girlfriend, forcing him to take a part of her powers, which turned him evil.]]

** [[Characters/TheMightyThorGiants Skurge the Executioner]] fought on the side of evil because he was in love with Amora the Enchantress. At first it seemed like she only strung him along, using him as valuable muscle, since he was strong enough to fight Thor. But she actually did miss him and even tried to bring him back from the dead several times.
** A juvenile, [[RaiseHimRightThisTime nicer]] incarnation of ComicBook/{{Loki}} gleefully explains to his current [[PuppyLove love interest]] that he was willing to postpone whatever plan he had to help Asgardia, thus risking it failing, just to increase the odds of saving her too. Loki, when he has people he cares for, which is admittedly not often, has a general tendency to do terrible things for their benefit. Putting them before the fate of the world or making deals with literal devils several times over.

* The Jackal's StartOfDarkness began with the death of Gwen Stacy. As Professor Miles Warren, he was secretly in love with his student, and could never get it out of his head that Franchise/SpiderMan (who he later discovered was another of his students and her boyfriend) was more to blame than the Green Goblin was. (It should be noted that although Warren received the financial backing of Comicbook/NormanOsborn, the true mastermind of the Comicbook/TheCloneSaga, he was kept in the dark about his identity.) Indeed, he tried to recreate her with a clone of Gwen (dozens, actually, but only one shared Ben Reilly's apparent immunity to the degeneration factor). When the second Carrion (Malcolm [=McBride=]) appeared (with Warren still believed dead) Spidey called Warren "A sick man obsessed with a dead woman" in disgust. But even when revealed to be alive, he would never let Spidey forget it. In fact, in one of the last fights between them (when his consciousness was inside the body of a coroner who had turned himself into the third Carrion, in ''Spider-Man: Dead Man's Hand''), Spidey told him, "Still hung up on Gwen, huh? Some things never change."

* In ''Comicbook/SupergirlRebirth'' Cyborg Superman does horrible, horrible things like turning corpses into reanimated, soulless zombie cyborgs and making human sacrifices. And everything -- ''everything'' -- he does is because he loves his daughter -- [[spoiler:Comicbook/{{Supergirl}}]] -- and wants her to be happy. He says "I'm doing this for you!" over and again, and he means it.
* Inverted with Comicbook/{{Thanos}} of the Franchise/MarvelUniverse, who was evil from the very beginning (or best case, a NobleDemon), but through it found love in [[AnthropomorphicPersonification (the Lady Death) itself]]. However, their [[TheMasochismTango tumultuous relationship]] has been known to drive him [[LoveMakesYouCrazy crazy]] at times.
* Depending on the writer, Creator/MarvelComics villain Whirlwind is this. At one point, he accuses Comicbook/TheWasp of "owing" him, because his attacks on ComicBook/TheAvengers were attempts to get her attention.
* ''Franchise/WonderWoman'' [[ComicBook/WonderWoman1942 Vol 1]]: Paula von Gunther refused to work for the Nazis so they made her watch as they murdered her husband and then took her daughter Gerta hostage. In response, Paula decided that even if she'd probably never see her daughter again that Gerta was worth more to her than the rest of the world and came to enjoy her sadistic torture and experimentation on people for the Nazis, even if she never did stop hating the Nazis themselves.

* ''Film/EventHorizon'': It is strongly implied that [[spoiler:Dr. Weir's wife Claire committed BathSuicide in his absence while he was working on the gateway drive. The guilt gnaws at him, and [[GeniusLoci the haunted ship]] uses this to drive him insane and turn him into a [[{{Expy}} pseudo-]][[Film/{{Hellraiser}} Cenobite]].]]

* ''Franchise/StarWars''

--->Love love is gonna lead you by the hand/Into a white and soundless place/Now we see things as in a mirror dimly/Then we shall see each other face to face

* Giuseppe Verdi ''loved'' the trope, as proved by:
** Count di Luna in ''Il trovatore'' is so jealous of his rival that he outright says he wants to act as evil towards him as possible. It ended in his rival and his beloved both being dead.
** Amneris in ''Aida'' is madly jealous after she realizes Radames loves Aida. Her actions lead to her rival and her beloved both being dead (you can probably see a pattern here).
** Eboli in ''Don Carlo'' goes berserk after realizing her beloved Don Carlos is in love with the queen.
** Abigail in ''Nabucco''.

* Nessarose, Elphaba's beautiful but unstable sister from ''Theatre/{{Wicked}}''. Her obsessive love for Boq leads her to enslave the Munchkins so he can't leave her. When she discovers he doesn't return her feelings and has really loved Glinda all along, she [[spoiler:shrinks his heart so he can feel her pain; Elphaba has to turn him into the Tin Man in order to save him]].

* It would seem like [[spoiler: [[BigBad Junko Enoshima]]]] from ''VisualNovel/DanganronpaTriggerHappyHavoc'' would hate her classmates, judging by the fact that [[spoiler: she put them in a killing game,]] but the series' creator Kazutaka Kodaka has the opposite to say; [[spoiler: he explained that, "Enoshima loves her classmates," and, "It's like, the more she loves someone, the more she wants to treasure their mutual killing," which is to say that she wanted to feel the despair of seeing her beloved friends kill each other, and you can't feel pain at watching someone die if you don't care about them.]]

* ''WebVideo/DoctorHorriblesSingAlongBlog'' is about a [[IneffectualSympatheticVillain comically ineffectual supervillain]] who is constantly humiliated by his ArchEnemy, JerkJock Captain Hammer. Dr. Horrible doesn't truly start to turn evil until Hammer steals his would-be girlfriend, Penny, making [[ItsPersonal it personal]] and driving him to attempt to MurderTheHypotenuse. NiceJobBreakingItHero.

* In ''WesternAnimation/TheDragonPrince'', love tends to be a driving force for a lot of the main characters, familial or romantic. [[spoiler: A familial variant of this trope comes into play with Claudia. She's willing to do anything to keep her remaining family happy, even if that means betraying her childhood friends, going against her brother who knows better, and [[{{Necromancy}} even reviving her dead father]] after he was thrown off a mountain top by that "wretched elf" Rayla.]]
* ''WesternAnimation/HarleyQuinn2019'': While Harley always had a repressed dark side, it was falling in love with Joker that drove her to embrace her murderous impulses and become a villainess. [[spoiler:Later, thinking she can't get Ivy because the latter already has Kite Man, Harley makes a deal with Darkseid and uses a Parademon army to massacre the people in Gotham, mostly just to distract herself from [[LoveHurts the pain]].]]

* In the fourth episode of ''WesternAnimation/WhatIf2021'', Doctor Strange ends up this way since he loses his girlfriend Christine in a car accident, rather than shattering his hands like in [[Film/DoctorStrange2016 the prime reality]][[note]]The point of divergence from the film is that Stephen and Christine never broke up beforehand[[/note]]. [[spoiler: Stephen becomes unable to accept her death and studies magic to learn how to reverse time and prevent it. He ultimately plans to perform a DangerousForbiddenTechnique to save her since [[YouCantFightFate her death is a fixed point in time]]. Good news: [[BeCarefulWhatYouWishFor he does manage to save her]]! Bad news: Without her death, he would have never mastered the Time Stone in the first place, and the resulting RealityBreakingParadox ends up ''[[ApocalypseHow/ClassX4 destroying the universe]]'' and [[AllForNothing kills Christine anyway]], leaving Strange alone in a black void and [[MyGodWhatHaveIDone brought to tears over what he's done]].]]
** Another example happens in Episode Five. [[spoiler: Scarlet Witch became a ZombieInfectee, and Vision's love for her drove him to develop a cure instead of immediately killing her. While he did manage to create a working cure for the plague, Wanda's powers prevented her from being affected by it. Even worse, it's revealed that in order to keep her hunger satisfied in the meantime, Vision lured dozens of people to his base to be EatenAlive, even keeping T'Challa around and [[AnArmAndALeg cutting off limbs to feed her]]. While he ''does'' [[RedemptionEqualsDeath redeem himself by sacrificing the Mind Stone]] to Spider-Man's survivor group, it happens far too late as his actions lead Wanda to break free and kill several members of the group.]]

* On ''WesternAnimation/YoungJustice'', this serves as the cover story for [[spoiler:Aqualad's fake FaceHeelTurn in order to go deep undercover]].

-->-- '''Shinra''', ''LightNovel/{{Durarara}}''

* In Season 3 of ''Animation/FlowerFairy'', the reason Princess Fanny lets herself succumb to the Dark Demon's power and become a villain is because of her crush on Prince Kukuru. During their childhood in the fairy world, Prince Kukuru [[DeclarationOfProtection promised to Fanny that he will protect her from harm]]. When they grow older, however, Kukuru decides he wants to be with [[spoiler:Xia An'an]] instead, which breaks Fanny's heart since she takes it as Kukuru breaching the promise he made to her. At some point in that season, Fanny goes as far as to [[spoiler:magically alter the red string of fate connecting An'an and Kukuru so that it connects Kukuru to Fanny instead, also causing him to turn against An'an]].

* In Season 3 of ''Animation/FlowerFairy'', the reason Princess Fanny lets herself succumb to the Dark Demon's power and become a villain is because of her crush on Price Kukuru. During their childhood in the fairy world, Prince Kukuru [[DeclarationOfProtection promised to Fanny that he will protect her from harm]]. When they grow older, however, Kukuru decides he wants to be with [[spoiler:Xia An'an]] instead, which breaks Fanny's heart since she takes it as Kukuru breaching the promise he made to her. At some point in that season, Fanny goes as far as to [[spoiler:magically alter the red string of fate connecting An'an and Kukuru so that it connects Kukuru to Fanny instead, also causing him to turn against An'an]].

* Stephen Sondheim's ''Theatre/{{Assassins}}'', a musical about the men and women who have either killed U.S. presidents or attempted to do so, gives us the examples of John Hinckley, Jr. (see Real Life below) and Lynette "Squeaky" Fromme, who tried to murder Gerald Ford in an attempt to impress Charles Manson. They even have a duet about it: "Unworthy of Your Love."

** In ''Theatre/TheTwoGentlemenOfVerona'', Proteus falls hard for Silvia, who is already [[spoiler: in a secret relationship with Proteus' friend Valentine]]. His newfound feelings drive Proteus to [[spoiler: get Valentine banished and to threaten to rape Silvia if she does not submit to his advances]].

* Comicbook/BlackAdam in Franchise/TheDCU first turned to totalitarianism when his wife was killed while he was away. Eventually (as in thousands of years later) he started to reform, especially when he [[LoveRedeems fell in love again with Isis]] as seen during ''ComicBook/FiftyTwo''. [[spoiler:When Isis was murdered, he leveled an entire nation and took on every active superhero on Earth at once.]] Later he combined this trope and WithGreatPowerComesGreatInsanity. [[spoiler: When he resurrected Isis with a fraction of his power she turned evil, ripped Captain Marvel from his powers and wrought chaos in the world seeking revenge. Later in that same story Mary Marvel, corrupted with powers Black Adam gave her, threatens Billy's ex-girlfriend, forcing him to take a part of her powers, which turned him evil.]]
* The ComicBook/BlackWidow's mentor Ivan Petrovich had unrequited feelings for her for almost as long as he knew her, despite her only seeing him as a friend and father-figure. Eventually, this caused him to snap and concoct a plan in which he faked his death, unleashed nanobots that targeted everyone Natasha knew and cared for, including her former lovers, transferred his brain into a cyborg body, and intended to unleash nuclear devastation upon the world. Natasha was forced to kill him to put an end to his evil plot and as a result lost her oldest and dearest friend.

* ''Franchise/WonderWoman'' [[ComicBook/WonderWoman1942 Vol 1]]: Paula von Gunther refused to work for the Nazis so they made her watch as they murdered her husband and then took her daughter Gerta hostage. In response Paula decided that even if she'd probably never see her daughter again that Gerta was worth more to her than the rest of the world and came to enjoy her sadistic torture and experimentation on people for the Nazis, even if she never did stop hating the Nazis themselves.

* ''Fanfic/ACrownOfStars'': Shinji loves Asuka so much he -- someone who hates killing even in self defense -- would kill with his bare hands, crush or burn alive whoever hurt her, and he would "burn Heaven down for her". It disturbs him severely when he realizes that he would become a monster if something happened to Asuka. So he tells her that he would do anything for her, even becoming a monster, and he trusts her to hold him back.

** While Loki is more or less redeemed [[ReformedButNotTamed (more or less)]], as per canon he is willing to go some truly horrifying lengths to protect his loved ones.

** Harry also has some alarming tendencies in this direction. At one point, after his best friend/borderline [[MindlinkMates Mindlink Mate]] is nearly killed, he frankly admits he was willing to threaten the Council Elite of Skyfathers with unleashing the Phoenix - something which not only risked him becoming the Dark Phoenix, but also [[spoiler:unleashing the ''original'' Dark Phoenix and potentially ''destroying the Nine Realms'']] - to make them bring her back. While he had other plans, and is both aware of this tendency and alarmed by it (relying heavily on {{Morality Chain}}s), this is not the only time that he's noted as being willing to do some very frightening things for the sake of/to avenge his loved ones - the results tend to draw Magneto comparisons.

** Zigzagged with [[{{Jerkass}} Shinji.]] On one hand, he became slightly tolerable when he got a girlfriend, family and friends. On the other hand, he'll kill ruthlessly and bloodily whoever threatens them, and [[spoiler:started an [[TheEndOfTheWorldAsWeKnowIt Impact event]] to bring Asuka and Misato back from the dead]].

* Downplayed with Feral in ''Fanfic/RunningWithLightningFeet''. He's actually very sweet, awkward and nice, but his older brothers are Sith warriors and because he wants to be a good sibling, he's following their orders. Plo Koon and Wolffe try to point that it kinda makes Feral AccompliceByInaction and might not be the best way to live for the young Zabrak, as it obviously runs contrary to his very temperament.

* The 1956 horror film ''Film/TheBlackSleep'' stars Creator/BasilRathbone as a 19th century neurosurgeon named Cadman who uses experimental brain operations to turn his colleague into a mindless brute with an incestuous longing for his daughter and keeps him around to force his daughter to work for him, has his assistant abduct homeless people with promises of shelter and pay, destroys a test subject's ocular faculties so he cannot see and escape, frames his star pupil for murder, fakes his pupil's death, and then blackmails him into helping him or risk exposure. Why is Cadman doing this? So he can learn enough about how the brain functions to save his wife from a paralyzing brain tumor.

* In ''Film/GhostbustersII'', Jaonsz falls into this. He's initially a DoggedNiceGuy, but then undergoes DemonicPossession for most of the film. In the third act, he rejoices at the prospect of Dana becoming his wife if he helps Vigo abduct Oscar. He gets better later in the end.
* ''Film/TheHole'' combines this with LoveMakesYouCrazy in not just one, but two examples, owing to its use of RashomonStyle. In the first version of the story, Liz explains that [[spoiler: Martin's love of Liz and [[GreenEyedMonster jealousy]] of her liking Mike led him to lock Liz, Mike, Frankie and Geoff in the titular bomb shelter (in which they had been hiding to avoid going on a school trip) until she realized she didn't really like him very much]]. In the second, true version, it is revealed that [[spoiler: Mike wanted to leave the bomb shelter early to go patch things up with his ex, but Liz had become so obsessed with him that she decided to lock herself and the others inside the bomb shelter to prevent him from leaving, ultimately leading to Frankie, Geoff and Mike dying. She then kills Martin too to cover her tracks]].

* ''Film/LetMeIn'' has Owen. He has been neglected by his family, brutally bullied and beaten at school, and has no other friends or anyone else to look after him. Abby is the only one who shows real love and affection for him and protects him. Technically, Owen hasn't done anything bad yet other than helping his vampire lover Abby hide a corpse. But at the end of the plot he leaves the city with her. Whether she turned him into a vampire or her new caretaker, he will kill people for the rest of his life to get their blood.

** Non-romantic love, but Loki in ''Film/{{Thor}}'' loves his father and his Asgardian home very, very much. His desire to be acknowledged and loved on par to his brother Thor leads him to attempt genocide.

* The hidden setup of ''Film/SoIMarriedAnAxeMurderer'' as we find out in TheReveal. It is questionable, however, on whether the culprit, [[spoiler: Rose Michaels]], is actually [[LoveMakesYouCrazy insane]] the whole time.

* Creator/{{Lifetime}} movie ''Stalked At 17'' flirts between this and LoveMakesYouCrazy. Chad, a twenty-two-year-old college student, becomes obsessed with his sixteen/seventeen-year-old girlfriend, Angela, when she reveals that she's pregnant. When Angela's parents find out about her pregnancy and the father of their grandchild, they try to create some distance. This doesn't set well for Chad as he starts to stalk them and tries getting in contact with them. His {{Yandere}} levels go through the roof when he tries attacking Angela's father for getting a restraining order against him. He even turns to his mother, who was recently released from prison, for help on kidnapping Angela and their newborn son so that they can be a family together.

* ''Film/UniversalSoldierTheReturn'': It's easy to interpret S.E.T.H.'s intent to turn Luc's daughter into a Unisol as some sort of twisted fatherly affection on his part, since she was one of his only human contacts and he looks genuinely concerned when he visits her in the hospital and realizes she has a fever. In S.E.T.H.'s mind, he's just ensuring that she will never die.

* ''Film/XMenFirstClass'' shows that Erik's greatest motivation has always been love, be it for his people, his mother, the X-Men, or Charles. He loves them all, and is willing to do terrifying things to avenge them and keep them safe.

* In [[https://www.youtube.com/watch?v=E52rxz2sjRs The Willow Maid]], the titular fairy is murdered by a man who claims to be in love with her. After she rejects him, he chops down [[PlantPerson her tree]], and forces her to leave the forest with him. As he wanted to [[AndNowYouMustMarryMe force]] her to [[MaritalRapeLicense marry]] him, and it was clear from the beginning that there would not be a happy end, the fact that she turns in a flower and wilts after leaving the forest comes across as a BittersweetEnding. At least she is [[FateWorseThanDeath spared worse]].

* In the ''Fellowship of the White Star'' event "London Fires," [[spoiler:the arsons are caused by a woman who is in love with a heroic NPC who once saved her from a fire demon. She is setting various locations in London on fire in an attempt to meet him again and properly declare her love for him]].[[note]]This seems to be based off old Japanese Folklore.[[/note]]

* In a sourcebook for the ''TabletopGame/StarWarsD20'' role playing game this is used as a justification for Jedi not being allowed to love. More often than not it leads to anger, jealousy and the dark side.

* OlderThanFeudalism: Theatre/{{Medea}} murdered her brother and betrayed her people for her love of Jason. Then in the play he leaves her, and she goes a bit murderous then as well, though that's more about [[RoaringRampageOfRevenge revenge]].

* Caster from ''VisualNovel/FateStayNight''. At one point in UBW her arrogant, calculating mask slips and she's absolutely scared to death about her prospects. She's started doing horrible things, much worse than she did as [[spoiler:Medea]] in pursuit of a goal she doesn't believe is actually possible. It's not helped along by Kuzuki's incredibly emotionless behavior.

--->"Zimmy is straight up lying. She knows the best way to keep a friend is to make them think everyone else hates them."

** However, in Oasis' case, her insanity is due to her strange and large unrevealed abilities, which allows her to be resurrected from death, but radically alters her personality Solomon Grundy style; she could be completely AxCrazy one incarnation, and rational and contemplative the next. On the other hand, before meeting the heroes she was mind controlled by a villain, whose brief order to love Torg has been thought to have conflicted with later orders, which is thought to be the root of her insanity in the first place...

** Harley Quinn, although listed above, did originate in the Franchise/DCAnimatedUniverse. She is shown to be a generally good (if crazy) person when on her own. Being in love with The Joker though, brings her to all the depths one would expect.
** This incarnation of Jervis Tetch, aka the Mad Hatter, is originally a [[IntelligenceEqualsIsolation lonely genius]] who develops MindControl devices for Wayne Tech Enterprises. He falls hard for a secretary named Alice, but she has a long-time boyfriend, and though it's a struggle, Tetch genuinely tries to leave her alone because he knows that it would be wrong to force them apart. It isn't until he gets a chance at a date with her (Alice and her boyfriend fight, and Tetch decides to take her out on the town) that he develops the Hatter persona and starts using his technology for nefarious purposes--and when Alice returns to her boyfriend, Tetch goes JumpingOffTheSlipperySlope and tumbles into completely insanity.

* ''WesternAnimation/DannyPhantom'' has Vlad Masters/Plasmius who tries to [[MurderTheHypotenuse murder his once best friend to obtain the woman he loves]], not to mention try and constantly MindRape Danny into being his surrogate son, later going as far as making a [[CloningBlues perfect clone]] of him. The ultimate irony is that in an alternate timeline, Vlad ends up marrying Maddie, but it's not a happy marriage due to the fact that he's a total control freak. What's more, Maddie ''still'' prefers Jack.

* ''WesternAnimation/HarleyQuinn2019'': While Harley always had a repressed dark side, it was falling in love with Joker what drove to embrace her murderous impulses and become a villainess. [[spoiler:Later, thinking she can't get Ivy because the latter already has Kite Man, Harley makes a deal with Darkseid and uses a Parademon army to massacre the people in Gotham, mostly just to distract herself from [[LoveHurts the pain]].]]

** Morty asks Rick in “Rick Potion #9” to make him a LovePotion for Jessica, and still decides to use it even after Rick calls him out for essentially using a date rape drug.

* The Soul Sever from the ''WesternAnimation/Thundercats2011'' episode of the same name is a robot powered by the soul of a dead man who slaughtered the original coven of Mechromancers (think a LighterAndSofter version of the Necrons) when they wouldn't also ressurect his family. He stole their secrets and placed his family's souls in machines that kept them tied to the material realm, and began researching how to replicate his condition. It turns out, only a select few have the capacity to become {{Artificial|Zombie}} [[RevenantZombie Revenants]] like him, and anyone else becomes mindlesly hungry [[HauntedTechnology zombie robots]].

* ''WesternAnimation/WanderOverYonder'' has an entire episode centered around this trope entitled "The Lonely Planet". The titular character and Sylvia find a drab and empty planet but ever the optimist, Wander complements it by saying that it has lots of potential. It turns out that the planet can talk and change her environment. She tells Wander how thrilled she is to have visitors before introducing herself as Janet and making the planet an all out paradise for him. [[ButtMonkey The same cannot be said for]] [[TheChewToy Sylvia]] though. Janet [[SugarWiki/FunnyMoments blows fire in her face, gives her the universe's equivalent of poison ivy, grows jagged sharp rocks seconds after Sylvia gleefully tumbled down a hill.]] and basically goes from ClingyJealousGirl to {{Yandere}} when she decides to [[MurderTheHypotenuse flat out kill her]].

** Another example happens in Episode Five. [[spoiler: Scarlet Witch became a ZombieInfectee, and Vision's love for her drove him to develop a cure instead of immediately killing her. While he did manage to create a working cure for the plague, Wanda's powers prevented her from being effected by it. Even worse, it's revealed that in order to keep her hunger satisfied in the meantime, Vision lured dozens of people to his base to be EatenAlive, even keeping T'Challa around and [[AnArmAndALeg cutting off limbs to feed her]]. While he ''does'' [[RedemptionEqualsDeath redeem himself by sacrificing the Mind Stone]] to Spider-Man's survivor group, it happens far too late as his actions lead Wanda to break free and kill several members of the group.]]

* This and IdiotPlot are the main tropes leading to the [[DownerEnding Bad Ends]] in ''VisualNovel/SchoolDays''. Well, those of the anime and manga adaptations anyway. The bad endings in the original VisualNovel are [[EarnYourBadEnding entirely avoidable]].

** Also, in some versions, this is why Mr Freeze is a villain - for the love of his IllGirl wife Nora.

* In ''Webcomic/HaruSari'', we have [[spoiler:Chi-Min, who could've healed [[IllGirl June]]'s Calphanika's, but because he wanted her to need him. Alberich may also count, he stated that'd he'd do anything for Phoenix. ANYTHING]].

How many times have we heard this? "I [[DoggedNiceGuy did this]] for ''you!'' [[TragicDream So we could be happy together!]]" Love can be a strong motivation for [[LoveRedeems good]]. But if you are in a LoveTriangle, or your loved one is [[IllGirl dying of cancer]], it can also be a great motivation for [[MurderTheHypotenuse murdering the hypotenuse]], making a FaceHeelTurn, embracing TheDarkSide, [[DealWithTheDevil selling your soul to the devil]], [[RapeIsASpecialKindOFEvil raping your love interest]], or cursing yourself by opening the TomeOfEldritchLore, up to causing TheEndOfTheWorldAsWeKnowIt. And if that person should die, they are willing to go to horrific lengths to [[{{Necromantic}} bring them back]].

* ''Theatre/MarieAntoinetteMusical'': Orléans in the Hungarian production. He was in love with Marie Antoinette but, when she rejected him, he decided to have revenge and becoming the antagonist as a result.