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** 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 [[TheSociopath Lila Rossi]] falls into this - [[EvilIsPetty her vendetta against Ladybug began because the heroine embarrassed her in front of her crush]] (the fact that Lila brought it on herself [[NeverMyFault slips her mind]]).

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** 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 [[TheSociopath Lila Rossi]] falls into this - [[EvilIsPetty her vendetta against Ladybug began because the heroine embarrassed harshly humiliated her in front of her crush]] (the fact that Lila brought it on herself was not guiltless [[NeverMyFault slips her mind]]).

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** The process of turning a person into an akuma (effectively a demon) seems to require said person to feel intense emotions of anger and hurt. So several of the akumatized villains are people who were angry over the mistreatment of their loved ones (love interests, family members, or close friends), or were in emotional pain because they were betrayed by someone they loved. Lê Chiến Kim felt betrayed because his crush rejected his romantic advances and humiliated him, Sabrina Raincomprix felt betrayed because her best friend was angry with her and wanted to terminate their friendship, and Chloé Bourgeois felt betrayed because the hero she idolized rejected her genuine efforts to help with a case.


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're 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]].

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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're 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]].


* In ''WesternAnimation/MiraculousLadybug'', there are plenty of [[MonsterOfTheWeek akumatized villains]] that came about because of something bad happening to a victim's loved one; for example, Mayor Bourgeois was akumatized because his beloved daughter was going to leave him and Paris for New York, and Luka Couffaine was akumatized when a CorruptCorporateExecutive threatened his crush[[note]]He was already mad at him for plagiarizing his band, but threatening Marinette sealed the deal[[/note]].

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* In ''WesternAnimation/MiraculousLadybug'', there are plenty of [[MonsterOfTheWeek akumatized villains]] that came about because of something bad happening to a victim's loved one; for example, Mayor Bourgeois was akumatized because his beloved daughter was going to leave him and Paris for New York, Marc Anciel was akumatized after his crush accused him of playing with his feelings, and Luka Couffaine was akumatized when a CorruptCorporateExecutive threatened his crush[[note]]He was already mad at him for plagiarizing his band, but threatening Marinette sealed the deal[[/note]].deal[[/note]].
** 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 [[TheSociopath Lila Rossi]] falls into this - [[EvilIsPetty her vendetta against Ladybug began because the heroine embarrassed her in front of her crush]] (the fact that Lila brought it on herself [[NeverMyFault slips her mind]]).

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[[/folder]]

[[folder:Western Animation]]
* In ''WesternAnimation/MiraculousLadybug'', there are plenty of [[MonsterOfTheWeek akumatized villains]] that came about because of something bad happening to a victim's loved one; for example, Mayor Bourgeois was akumatized because his beloved daughter was going to leave him and Paris for New York, and Luka Couffaine was akumatized when a CorruptCorporateExecutive threatened his crush[[note]]He was already mad at him for plagiarizing his band, but threatening Marinette sealed the deal[[/note]].


* Alberich from Wagner's Tetralogy "Ring of the Nibelungs". Rejected by the Rhei

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* Alberich from Wagner's Tetralogy "Ring of the Nibelungs". Rejected by the RheiRhei
[[/folder]]


* ''Fanfic/ChildOfTheStorm'' has, towards the end of the first book and in the sequel, [[spoiler: Harry]] teeter on the edge of this trope. He mentions after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night'' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing [[spoiler: the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'']] - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of [[spoiler: the Dark Phoenix]]. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is definitely a representative example. However, the PowerOfFriendship and ThePowerOfLove hold him in check, as well as that it unnerves him as much as anyone else.

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* ''Fanfic/ChildOfTheStorm'' has, towards the end of the first book and in the sequel, [[spoiler: Harry]] teeter on the edge of this trope. He mentions after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night'' Hell'' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing [[spoiler: the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'']] - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of [[spoiler: the Dark Phoenix]]. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is definitely a representative example. However, the PowerOfFriendship and ThePowerOfLove hold him in check, as well as that it unnerves him as much as anyone else.



* Alberich from Wagner's Tetralogy "Ring of the Nibelungs". Rejected by the Rhein Nymph Sisters for being a {{Gonk}}, he curses love and steals their gold, creating the infamous ring.
* Monostatos in Mozart's ''The Magic Flute''.
* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be a {{Domestic Abuse}}r from the beginning.
[[/folder]]

[[folder:Professional Wrestling]]
* During the late 80s, Wrestling/RandySavage becomes the RivalTurnedEvil because of Wrestling/HulkHogan's alleged advances towards Wrestling/MissElizabeth.
* Wrestling/JimmyJacobs found love in Wrestling/RingOfHonor, unfortunately it was with one half of the Minnesota Home Wrecking Crew and former Special K member Lacey. The only thing not predictable about the results was just ''how bad'' they were.
[[/folder]]

[[folder:Tabletop Games]]
* 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]]
* This is yet another trope that the TabletopGame/{{Ravenloft}} setting was (literally!) built out of. From Strahd von Zarovich's obsession with stealing his brother's fiancee, to Victor Mordenheim's determination to restore his wife's shattered body at any cost, love -- or, at least, what villains ''claim'' is love -- is a ''far'' better candidate for the Root Of All Evil than money, in the Land of Mists.
* 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.
* ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/{{Warhammer 40000}}'': the Chaos god of decay and disease Nurgle is the embodiment of the emotion born out of man's reaction to death, usually interpreted as the emotion of ''love''. And indeed, of all the Chaos gods, he's the nicest to his cultists (who refer to him as Papa Nurgle or Grandfather Nurgle), [[BodyHorror showering his faithful with gifts]]. Followers of Nurgle then seek only to bring the joy of pestilence and death to the universe.
** Another way of looking at it is that Nurgle loves ''all'' life in the universe... including deadly parasites, bacteria, etc. He also [[AnAesop loves everyone and everything just the way they are]]... [[BrokenAesop regardless of whether or not "just the way they are" is actually good for them]], tieing in with his other role as god of decay.
[[/folder]]

[[folder:Theatre]]
* 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]].
** Later, in the song "No Good Deed," Elphaba's transformation into the Wicked Witch of the original Wizard of Oz is significantly assisted [[spoiler:when Fiyero throws himself to an angry mob to save her. She frantically tries to magically protect him from afar, utterly unsure that she is doing him any good. In frustration, she declares that "no good deed will I attempt to do again," and is a StrawNihilist for most of the rest of the show]].
* One of the oldest deconstructions of this trope occurs in Creator/WilliamShakespeare's ''Theatre/RichardIII''. Richard, claiming that because he is "deformed" no woman has ever loved him; as he sees it, there are but two courses in life for men to take - that of the lover, or that of the villain - and because no woman would ever allow him to be their lover, he must therefore become a villain. This, therefore, turns the trope on its ear, into Lovelessness Makes You Evil, leading to a very CryForTheDevil idealism. (Shakespeare then subverts Richard's excuse by showing him, in the ''very next scene'', successfully wooing the widow of a man he killed.)
* [[spoiler:Mrs. Lovett]] in ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet''. Sweeney too, but it's just as much about {{revenge}}.
** Judge Turpin could also qualify, though much like Frollo above, there's more than a bit of lust involved as well.
* 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]].
--> '''Medea:''' Oh, what an evil power love has in people's lives!
* All the murders in ''Theatre/LittleShopOfHorrors'' are influenced primarily by Seymour's love for Audrey.
* 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."
* The seventeenth-century English drama ''The Changeling'' has this happen with both main characters. Beatrice-Joanna, the daughter of a wealthy nobleman, falls for a handsome sailor named Alsemero, but is betrothed to an older man; she becomes so obsessed with marrying Alsemero that she hires [=DeFlores=], her father's deformed servant, to [[MurderTheHypotenuse take care of her fiancee for her]]. Unfortunately, [=DeFlores=] himself is in love with Beatrice-Joanna, and after committing the murder, blackmails her into [[RapeAsDrama sleeping with him]]. It's Beatrice-Joanna, though, who's the more villainous: she's the main instigator of all of the crimes in the play, but even as she confesses her deeds to Alsemero, she cries, "It for your sake was done!"
* The framing device for ''Theatre/ThrillMe'' is Nathan's parole hearing, where he explains his crimes (theft, arson, murder) as being due to his feelings for Richard.
-->But you've asked a simple question\\
And I've told you why\\
It wasn't on a dare or on a whim\\
It's hard to comprehend now\\
That the reason why\\
Was simply that I went along with him\\
[[/folder]]

[[folder:Visual Novels]]
* Denny and Capek, the first two antagonists of ''VisualNovel/ShikkokuNoSharnoth''. The latter is necromantic, and the former has some twisted motivation about becoming king in order to win love.
* ''VisualNovel/HatofulBoyfriend'' has a route called "Bad Boys Love". Why is it called that? Most likely because it's about [[spoiler:the human protagonist being KilledOffForReal, her main love interest being traumatized to hell and back, and the genocide of the entire human race being set up]] all because of [[spoiler:Doctor Shuu]]'s unrequited love for [[spoiler:Ryuuji Kawara]] that caused him to do his best to [[ThePromise fulfill his promise]] to said love to [[spoiler:fulfill any wish of his son]] [[MadScientist in the best way he knew how]]. Of course, [[spoiler:Doctor Shuu wasn't the most stable of creatures to begin with, but it doesn't change the fact that ''none of this'' would have happened if he hadn't loved Ryuuji enough to take his promise to him so horribly seriously]].
--->'''[[LetsPlay Angie Gallant]]:''' All he has done, he has done for love. HORRIBLE HORRIBLE EVIL UNEARTHLY INFERNAL LOVE.
* Roa of ''VisualNovel/{{Tsukihime}}'' was apparently a very pure and probably decent person before apparently falling in love with Arcuied at first sight. He decided it was hate for some reason, so he tricked her into drinking his blood, making him a Dead Apostle and making her kill off all the other True Ancestors. Apparently all he wanted was for him to like her...
** To expand on that, Roa was a completely pure priest and member of the Church's Burial Squad. He was doing some research on immortality until the point where he first saw Arcuied. The moment he saw her, he fell in love, but because until then he had never felt either love or hatred, he was confused. Thus, he decided that the pain in his heart must be hate; It's actually quite a tragic chain of events.
-->For the first time since he was born. Probably, no definitely, the only time in his life. -Michael Roa Valdamjong fell in love with that white woman- "--------" This is the first time. Not an impulse, but truly Roa's heart. The only remaining emotion. Roa's personality had long died, but it continues to exist without disappearing, that eternal memory. "?? I, see." That's why---he hated Arcueid so much. The woman who stole his purity. Just an instant. He only saw her for an instant, but his heart was stolen. That hated True Ancestor that caused his purity to fall. That existence. He hated everything about that white vampire princess. "?? What a mistake." What a mistake it was. Roa hated her so much that he reincarnated so many times and always waited for Arcueid to come pursue him each time. For that, he did anything. He deceived Arcuied, fooling her when she didn't even know she was a vampire, and let her suck his blood. Becoming a dead apostle of Arcuied, he used her power to destroy the remaining True Ancestors, and waited for her. Why did he not understand? The hate that caused him to reincarnate and wait for Arcueid. That isn't hatred. The man called Roa was so pure, he didn't even understand his own emotions. To think about someone else so much it makes you go almost crazy. That feeling is very similar to hatred. But, merely a single word. If this man called Roa could have been told his feeling was love, he wouldn't have made this mistake---
* 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.
* 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]].
* ''VisualNovel/HigurashiWhenTheyCry'' gives us a case of psychosis and mass murder over a ''bad'' case of one-sided LoveAtFirstSight. And psychosis and murder over brotherly love. ''Twice''. Essentially, Love Makes You Evil ''and'' [[LoveMakesYouCrazy crazy]]. This is played straight with [[spoiler:Shion]], but subverted with [[spoiler:Tomitake]], who is horrified at [[spoiler:Takano]]'s plans.
* In ''VisualNovel/{{Sunrider}}'', the [[ArtificialHuman Prototype]] named Alice was taken in by a benevolent revolutionary called [[spoiler:Arcadius]]. Alice fell in love with him, but when [[spoiler:Arcadius]] was killed by his own followers for trying to stop them from butchering a helpless man in cold blood, she snapped, deciding that HumansAreBastards and deserve to be wiped out in revenge for [[spoiler:Arcadius]]ís senseless death. [[spoiler:She and the other Prototypes then took up his identity, becoming the tyrannical Veniczar Arcadius seen in-game.]]
* ''VisualNovel/DokiDokiLiteratureClub'' has [[spoiler: Monika, the club president. She is aware of the fact that she is a character in a visual novel and knows about the existence of the player, who she becomes obsessed with. So much that she makes the character flaws and issues of the other three girls even more problematic than they were before in order to make them "unlikable" and when that doesn't work, she straight up erases them from the game.]]
[[/folder]]

[[folder:Web Comics]]
* In ''Webcomic/SluggyFreelance'', Oasis's love of Torg has taken her into serious {{Yandere}} territory, complete with trying to kill anyone she sees as a rival for Torg's affection (including chocolate ice cream), chaining Torg up so she can force him to marry her, and at one point planning to sew herself to Torg with industrial strength cable so they can never be apart. As seen in the "Phoenix Rising" arc, when she's not actively pursuing Torg she's ... well, not exactly ''good'', but definitely more of an AntiHero than a {{Villain|s}}.
** 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...
*** Even though Oasis herself came up with the idea, it's not at all clear she actually changes personalities between incarnations, as opposed to just as a reaction to different events and circumstances as part of her instability.
** There was also the "Love Potion" arc, where the titular LovePotion brings out the most violent and destructive side of love in everyone it's used on.
* ''Webcomic/GunnerkriggCourt'':
** Even in a world where [[WhiteAndGreyMorality there aren't any outright evil characters]], love can make you ''do evil things''. Zimmy loves Gamma more than anyone or anything else in the world; so to make sure Gamma never leaves her side, Zimmy [[TranslationWithAnAgenda intentionally mistranslates what her peers say]], to convince Gamma that all the other students think she's stupid and ugly. Yes, WordOfGod (specifically TheRant below [[http://www.gunnerkrigg.com/archive_page.php?comicID=455 this page]]) confirms that this is intentional:
--->"Zimmy is straight up lying. She knows the best way to keep a friend is to make them think everyone else hates them."
** '' Diego''. Dear God man you made the robot cry. And [[spoiler: sent the one you love to her death]].
** And Reynardine's backstory, when he fell in love. . . involved killing someone.
* Smiling Man from ''Webcomic/TheCrossoverlord'' was a hero, who travelled through [[AlternateUniverse Alternate Universes]] with his beloved wife, until something went wrong, and she started to merge together with all her alternate counterparts, including evil, sick and dead ones. This forced guardian of TheMultiverse to kill her, which drive her husband crazy and turned him into a sick mix of SlasherSmile, TheChessmaster, EmperorScientist and MultiversalConqueror.
* ''Webcomic/TheOrderOfTheStick'' gives us [[spoiler: Vaarsuvius's]] [[DealWithTheDevil soul-splice arc]]. Although lust for power and control had a big influence on the eventual decision to take the fiend's deal, the initial motivation for contacting them truly was out of fear for [[spoiler: Inkyrius and the children]].
* In ''Webcomic/{{Collar 6}}'' this seems to have happened to [[spoiler: Trina]].
* ''WebComic/{{Spacetrawler}}'':
-->'''Growp:''' You're like a work of art, Emily. Battling you fills me with emotion. I've never met someone who could match my ferocity, my brutality.\\
'''Emily:''' If you adore me so much, stop trying to ''kill'' me.\\
'''Growp:''' You don't understand, do you? To kill you would complete this piece of art, would be an expression of life, of being. And your death can only be art if the kill is made by the master skill of a hand as poetic as mine.....Grrr! What I'm saying isn't coming out right, what I'm ''trying'' to tell you is... Is that... I... I love you.
* 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.]]
* Lana from ''Webcomic/MSFHigh'', to the point she beats up anyone who makes eye contact with Donovan.
* Aaronev Wilhelm Sturmvoraus from ''Webcomic/GirlGenius''. Considering his family's history, he probably wasn't the best or the most sane person around before he met Lucrezia Mongfish, but it was his obsessive love for her that made him even more crazy and ruthless, to the point [[spoiler: he sacrificed possibly hundreds of young girls (including his own daughter) to bring her back]].
[[/folder]]

[[folder: Web Original]]
* ''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.
** And then the BittersweetEnding reveals that,[[spoiler: after his weapon exploded and killed Penny,]] Doctor Horrible has become even ''more'' evil.
-->''"And I won't feel...a thing..."''
* ''WebVideo/AtopTheFourthWall'': "What these comics are trying to tell us is that love ultimately leads to death, destruction, and the devil. In other words, love no one. Ever."
* WebVideo/TheNostalgiaChick's "love" for WebVideo/ToddInTheShadows. Nella ([[ItMakesSenseInContext dressed up as a nun]]) summed it up best when she said God would judge the Chick harshly for how low she's fallen.
* ''Literature/SailorNothing'': [[spoiler: the Dark Queen unintentionally created the Yami-gaia in an attempt to save her lover from dying of consumption]].
* Zig-Zagged in ''Literature/{{Tasakeru}}''. In the Mythology, two of the settings death-gods come about from mortals corrupted by unrequited love (The Scarred One, who had the good part of his soul die upon being rejected by the object of his affections and subsequently being disfigured by her lover, and Aconite, who was so desperate for the perfect husband she offered to submit to him utterly and became the embodiment of decay when her sisters slapped her with ThePunishment), while in-story, love triggers [[spoiler:two of the main characters ascension to demigods]].
* Twilight of ''WebVideo/FriendshipIsWitchcraft'' is already unstable, but her love for her [[NotBloodSiblings adoptive]] [[BrotherSisterIncest brother]] Francis drives her to [[spoiler: kill off his fiance and brainwash him into requiting her feelings]].
* In ''Literature/{{Worm}}'', [[spoiler:Trickster betrays his teammates for Noelle, his ex-girlfriend who had gone insane and become an OmnicidalManiac]].
* Salem from ''WebAnimation/{{RWBY}}'' was once a lonely girl who longed for freedom. She found that freedom in the eyes of the dashing hero who rescued her and fell deeply in love. It did not end well. [[spoiler:The man she loved, Ozma, died from a fatal sickness. For trying to manipulate the gods into restoring his life, she was cursed with immortality to prevent her from being with Ozma in the afterlife until she learned the importance of life and death. Instead, she incited humanity to rebel against the gods which led to the destruction of humanity and the moon. When the God of Light restored humanity, he gave humanity a single chance to earn redemption and gave Ozma the responsibility of making it happen. By then, however, Salem had dived into the God of Darkness's pools of annihilation; instead of ending her curse as she hoped, it corrupted her into a being of pure destruction. Now Salem and Ozma are bitterly opposed to each other, one trying to unite humanity to save it while the other tries to divide humanity to destroy it.]]
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/BatmanTheAnimatedSeries'':
** 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.
** Other characters that represent this trope are Mr. Freeze and the Mad Hatter.
* ''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/DarkwingDuck'', "[[Recap/DarkwingDuckS1E50TimeAndPunishment Time and Punishment]]", has KnightTemplar [=DarkWarrior=] Duck becoming bad all because of losing his little girl Gosalyn. Even when she turns against him and tries to reset time, he can't bring himself to harm her and breaks down in tears.
* One of the reasons why Trina Riffin from ''WesternAnimation/{{Grojband}}'' changed her name from Katrina and became [[BrattyTeenageDaughter the way she is now]] was so she could win over her crush Nick Mallory.
* ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'' episode "The Cosmic Comet". A ''comet'' goes evil because it lost its love.
* ''WesternAnimation/{{Kaeloo}}'': Mr. Cat wasn't a very nice person to begin with, but it's heavily implied that most of his evil deeds are done for the purpose of pushing Kaeloo past RageBreakingPoint just so she will [[JekyllAndHyde transform into a monster]], who he has a crush on.
* In ''WesternAnimation/TheLegendOfKorra'', [[spoiler: Hiroshi Sato]]'s reason for joining the Equalists was [[spoiler: the murder of his wife by a firebender]].
* 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.
* 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]].
* Nox, the BigBad from ''WesternAnimation/{{Wakfu}}''. His love for his family [[spoiler: that he lost 200 years prior to the show]] drives him to do terrible things. Up to and including genocide.
* ''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.]].
* On ''WesternAnimation/WordGirl,'' [[GadgeteerGenius Tobey's]] villainy seems to be at least somewhat motivated just by [[DatingCatwoman his desire to interact with Word Girl]].
* On ''WesternAnimation/YoungJustice'', this serves as the cover story for [[spoiler:Aqualad's fake FaceHeelTurn in order to go deep undercover]].
[[/folder]]

[[folder:Real Life]]
* John Hinckley, Jr., who shot UsefulNotes/RonaldReagan to impress Creator/JodieFoster. [[CaptainObvious It didn't work.]]
* The infamous [[http://en.wikipedia.org/wiki/Amy_Fisher Long Island Lolita]] case of Amy Fisher. A sixteen year old girl who shot Joey Buttafuoco's wife in the face. Fortunately, she survived. Joey Buttafuoco was having an affair with the teenage girl, despite being twice her age. The case got national attention during the early 90s and many made-for-television movies were created based on the case. These films were famous for starring known eye-candy as Amy Fisher. For example: Creator/AlyssaMilano and Creator/DrewBarrymore.
[[/folder]]

----

to:

* Alberich from Wagner's Tetralogy "Ring of the Nibelungs". Rejected by the Rhein Nymph Sisters for being a {{Gonk}}, he curses love and steals their gold, creating the infamous ring.
* Monostatos in Mozart's ''The Magic Flute''.
* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be a {{Domestic Abuse}}r from the beginning.
[[/folder]]

[[folder:Professional Wrestling]]
* During the late 80s, Wrestling/RandySavage becomes the RivalTurnedEvil because of Wrestling/HulkHogan's alleged advances towards Wrestling/MissElizabeth.
* Wrestling/JimmyJacobs found love in Wrestling/RingOfHonor, unfortunately it was with one half of the Minnesota Home Wrecking Crew and former Special K member Lacey. The only thing not predictable about the results was just ''how bad'' they were.
[[/folder]]

[[folder:Tabletop Games]]
* 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]]
* This is yet another trope that the TabletopGame/{{Ravenloft}} setting was (literally!) built out of. From Strahd von Zarovich's obsession with stealing his brother's fiancee, to Victor Mordenheim's determination to restore his wife's shattered body at any cost, love -- or, at least, what villains ''claim'' is love -- is a ''far'' better candidate for the Root Of All Evil than money, in the Land of Mists.
* 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.
* ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/{{Warhammer 40000}}'': the Chaos god of decay and disease Nurgle is the embodiment of the emotion born out of man's reaction to death, usually interpreted as the emotion of ''love''. And indeed, of all the Chaos gods, he's the nicest to his cultists (who refer to him as Papa Nurgle or Grandfather Nurgle), [[BodyHorror showering his faithful with gifts]]. Followers of Nurgle then seek only to bring the joy of pestilence and death to the universe.
** Another way of looking at it is that Nurgle loves ''all'' life in the universe... including deadly parasites, bacteria, etc. He also [[AnAesop loves everyone and everything just the way they are]]... [[BrokenAesop regardless of whether or not "just the way they are" is actually good for them]], tieing in with his other role as god of decay.
[[/folder]]

[[folder:Theatre]]
* 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]].
** Later, in the song "No Good Deed," Elphaba's transformation into the Wicked Witch of the original Wizard of Oz is significantly assisted [[spoiler:when Fiyero throws himself to an angry mob to save her. She frantically tries to magically protect him from afar, utterly unsure that she is doing him any good. In frustration, she declares that "no good deed will I attempt to do again," and is a StrawNihilist for most of the rest of the show]].
* One of the oldest deconstructions of this trope occurs in Creator/WilliamShakespeare's ''Theatre/RichardIII''. Richard, claiming that because he is "deformed" no woman has ever loved him; as he sees it, there are but two courses in life for men to take - that of the lover, or that of the villain - and because no woman would ever allow him to be their lover, he must therefore become a villain. This, therefore, turns the trope on its ear, into Lovelessness Makes You Evil, leading to a very CryForTheDevil idealism. (Shakespeare then subverts Richard's excuse by showing him, in the ''very next scene'', successfully wooing the widow of a man he killed.)
* [[spoiler:Mrs. Lovett]] in ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet''. Sweeney too, but it's just as much about {{revenge}}.
** Judge Turpin could also qualify, though much like Frollo above, there's more than a bit of lust involved as well.
* 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]].
--> '''Medea:''' Oh, what an evil power love has in people's lives!
* All the murders in ''Theatre/LittleShopOfHorrors'' are influenced primarily by Seymour's love for Audrey.
* 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."
* The seventeenth-century English drama ''The Changeling'' has this happen with both main characters. Beatrice-Joanna, the daughter of a wealthy nobleman, falls for a handsome sailor named Alsemero, but is betrothed to an older man; she becomes so obsessed with marrying Alsemero that she hires [=DeFlores=], her father's deformed servant, to [[MurderTheHypotenuse take care of her fiancee for her]]. Unfortunately, [=DeFlores=] himself is in love with Beatrice-Joanna, and after committing the murder, blackmails her into [[RapeAsDrama sleeping with him]]. It's Beatrice-Joanna, though, who's the more villainous: she's the main instigator of all of the crimes in the play, but even as she confesses her deeds to Alsemero, she cries, "It for your sake was done!"
* The framing device for ''Theatre/ThrillMe'' is Nathan's parole hearing, where he explains his crimes (theft, arson, murder) as being due to his feelings for Richard.
-->But you've asked a simple question\\
And I've told you why\\
It wasn't on a dare or on a whim\\
It's hard to comprehend now\\
That the reason why\\
Was simply that I went along with him\\
[[/folder]]

[[folder:Visual Novels]]
* Denny and Capek, the first two antagonists of ''VisualNovel/ShikkokuNoSharnoth''. The latter is necromantic, and the former has some twisted motivation about becoming king in order to win love.
* ''VisualNovel/HatofulBoyfriend'' has a route called "Bad Boys Love". Why is it called that? Most likely because it's about [[spoiler:the human protagonist being KilledOffForReal, her main love interest being traumatized to hell and back, and the genocide of the entire human race being set up]] all because of [[spoiler:Doctor Shuu]]'s unrequited love for [[spoiler:Ryuuji Kawara]] that caused him to do his best to [[ThePromise fulfill his promise]] to said love to [[spoiler:fulfill any wish of his son]] [[MadScientist in the best way he knew how]]. Of course, [[spoiler:Doctor Shuu wasn't the most stable of creatures to begin with, but it doesn't change the fact that ''none of this'' would have happened if he hadn't loved Ryuuji enough to take his promise to him so horribly seriously]].
--->'''[[LetsPlay Angie Gallant]]:''' All he has done, he has done for love. HORRIBLE HORRIBLE EVIL UNEARTHLY INFERNAL LOVE.
* Roa of ''VisualNovel/{{Tsukihime}}'' was apparently a very pure and probably decent person before apparently falling in love with Arcuied at first sight. He decided it was hate for some reason, so he tricked her into drinking his blood, making him a Dead Apostle and making her kill off all the other True Ancestors. Apparently all he wanted was for him to like her...
** To expand on that, Roa was a completely pure priest and member of the Church's Burial Squad. He was doing some research on immortality until the point where he first saw Arcuied. The moment he saw her, he fell in love, but because until then he had never felt either love or hatred, he was confused. Thus, he decided that the pain in his heart must be hate; It's actually quite a tragic chain of events.
-->For the first time since he was born. Probably, no definitely, the only time in his life. -Michael Roa Valdamjong fell in love with that white woman- "--------" This is the first time. Not an impulse, but truly Roa's heart. The only remaining emotion. Roa's personality had long died, but it continues to exist without disappearing, that eternal memory. "?? I, see." That's why---he hated Arcueid so much. The woman who stole his purity. Just an instant. He only saw her for an instant, but his heart was stolen. That hated True Ancestor that caused his purity to fall. That existence. He hated everything about that white vampire princess. "?? What a mistake." What a mistake it was. Roa hated her so much that he reincarnated so many times and always waited for Arcueid to come pursue him each time. For that, he did anything. He deceived Arcuied, fooling her when she didn't even know she was a vampire, and let her suck his blood. Becoming a dead apostle of Arcuied, he used her power to destroy the remaining True Ancestors, and waited for her. Why did he not understand? The hate that caused him to reincarnate and wait for Arcueid. That isn't hatred. The man called Roa was so pure, he didn't even understand his own emotions. To think about someone else so much it makes you go almost crazy. That feeling is very similar to hatred. But, merely a single word. If this man called Roa could have been told his feeling was love, he wouldn't have made this mistake---
* 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.
* 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]].
* ''VisualNovel/HigurashiWhenTheyCry'' gives us a case of psychosis and mass murder over a ''bad'' case of one-sided LoveAtFirstSight. And psychosis and murder over brotherly love. ''Twice''. Essentially, Love Makes You Evil ''and'' [[LoveMakesYouCrazy crazy]]. This is played straight with [[spoiler:Shion]], but subverted with [[spoiler:Tomitake]], who is horrified at [[spoiler:Takano]]'s plans.
* In ''VisualNovel/{{Sunrider}}'', the [[ArtificialHuman Prototype]] named Alice was taken in by a benevolent revolutionary called [[spoiler:Arcadius]]. Alice fell in love with him, but when [[spoiler:Arcadius]] was killed by his own followers for trying to stop them from butchering a helpless man in cold blood, she snapped, deciding that HumansAreBastards and deserve to be wiped out in revenge for [[spoiler:Arcadius]]ís senseless death. [[spoiler:She and the other Prototypes then took up his identity, becoming the tyrannical Veniczar Arcadius seen in-game.]]
* ''VisualNovel/DokiDokiLiteratureClub'' has [[spoiler: Monika, the club president. She is aware of the fact that she is a character in a visual novel and knows about the existence of the player, who she becomes obsessed with. So much that she makes the character flaws and issues of the other three girls even more problematic than they were before in order to make them "unlikable" and when that doesn't work, she straight up erases them from the game.]]
[[/folder]]

[[folder:Web Comics]]
* In ''Webcomic/SluggyFreelance'', Oasis's love of Torg has taken her into serious {{Yandere}} territory, complete with trying to kill anyone she sees as a rival for Torg's affection (including chocolate ice cream), chaining Torg up so she can force him to marry her, and at one point planning to sew herself to Torg with industrial strength cable so they can never be apart. As seen in the "Phoenix Rising" arc, when she's not actively pursuing Torg she's ... well, not exactly ''good'', but definitely more of an AntiHero than a {{Villain|s}}.
** 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...
*** Even though Oasis herself came up with the idea, it's not at all clear she actually changes personalities between incarnations, as opposed to just as a reaction to different events and circumstances as part of her instability.
** There was also the "Love Potion" arc, where the titular LovePotion brings out the most violent and destructive side of love in everyone it's used on.
* ''Webcomic/GunnerkriggCourt'':
** Even in a world where [[WhiteAndGreyMorality there aren't any outright evil characters]], love can make you ''do evil things''. Zimmy loves Gamma more than anyone or anything else in the world; so to make sure Gamma never leaves her side, Zimmy [[TranslationWithAnAgenda intentionally mistranslates what her peers say]], to convince Gamma that all the other students think she's stupid and ugly. Yes, WordOfGod (specifically TheRant below [[http://www.gunnerkrigg.com/archive_page.php?comicID=455 this page]]) confirms that this is intentional:
--->"Zimmy is straight up lying. She knows the best way to keep a friend is to make them think everyone else hates them."
** '' Diego''. Dear God man you made the robot cry. And [[spoiler: sent the one you love to her death]].
** And Reynardine's backstory, when he fell in love. . . involved killing someone.
* Smiling Man from ''Webcomic/TheCrossoverlord'' was a hero, who travelled through [[AlternateUniverse Alternate Universes]] with his beloved wife, until something went wrong, and she started to merge together with all her alternate counterparts, including evil, sick and dead ones. This forced guardian of TheMultiverse to kill her, which drive her husband crazy and turned him into a sick mix of SlasherSmile, TheChessmaster, EmperorScientist and MultiversalConqueror.
* ''Webcomic/TheOrderOfTheStick'' gives us [[spoiler: Vaarsuvius's]] [[DealWithTheDevil soul-splice arc]]. Although lust for power and control had a big influence on the eventual decision to take the fiend's deal, the initial motivation for contacting them truly was out of fear for [[spoiler: Inkyrius and the children]].
* In ''Webcomic/{{Collar 6}}'' this seems to have happened to [[spoiler: Trina]].
* ''WebComic/{{Spacetrawler}}'':
-->'''Growp:''' You're like a work of art, Emily. Battling you fills me with emotion. I've never met someone who could match my ferocity, my brutality.\\
'''Emily:''' If you adore me so much, stop trying to ''kill'' me.\\
'''Growp:''' You don't understand, do you? To kill you would complete this piece of art, would be an expression of life, of being. And your death can only be art if the kill is made by the master skill of a hand as poetic as mine.....Grrr! What I'm saying isn't coming out right, what I'm ''trying'' to tell you is... Is that... I... I love you.
* 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.]]
* Lana from ''Webcomic/MSFHigh'', to the point she beats up anyone who makes eye contact with Donovan.
* Aaronev Wilhelm Sturmvoraus from ''Webcomic/GirlGenius''. Considering his family's history, he probably wasn't the best or the most sane person around before he met Lucrezia Mongfish, but it was his obsessive love for her that made him even more crazy and ruthless, to the point [[spoiler: he sacrificed possibly hundreds of young girls (including his own daughter) to bring her back]].
[[/folder]]

[[folder: Web Original]]
* ''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.
** And then the BittersweetEnding reveals that,[[spoiler: after his weapon exploded and killed Penny,]] Doctor Horrible has become even ''more'' evil.
-->''"And I won't feel...a thing..."''
* ''WebVideo/AtopTheFourthWall'': "What these comics are trying to tell us is that love ultimately leads to death, destruction, and the devil. In other words, love no one. Ever."
* WebVideo/TheNostalgiaChick's "love" for WebVideo/ToddInTheShadows. Nella ([[ItMakesSenseInContext dressed up as a nun]]) summed it up best when she said God would judge the Chick harshly for how low she's fallen.
* ''Literature/SailorNothing'': [[spoiler: the Dark Queen unintentionally created the Yami-gaia in an attempt to save her lover from dying of consumption]].
* Zig-Zagged in ''Literature/{{Tasakeru}}''. In the Mythology, two of the settings death-gods come about from mortals corrupted by unrequited love (The Scarred One, who had the good part of his soul die upon being rejected by the object of his affections and subsequently being disfigured by her lover, and Aconite, who was so desperate for the perfect husband she offered to submit to him utterly and became the embodiment of decay when her sisters slapped her with ThePunishment), while in-story, love triggers [[spoiler:two of the main characters ascension to demigods]].
* Twilight of ''WebVideo/FriendshipIsWitchcraft'' is already unstable, but her love for her [[NotBloodSiblings adoptive]] [[BrotherSisterIncest brother]] Francis drives her to [[spoiler: kill off his fiance and brainwash him into requiting her feelings]].
* In ''Literature/{{Worm}}'', [[spoiler:Trickster betrays his teammates for Noelle, his ex-girlfriend who had gone insane and become an OmnicidalManiac]].
* Salem from ''WebAnimation/{{RWBY}}'' was once a lonely girl who longed for freedom. She found that freedom in the eyes of the dashing hero who rescued her and fell deeply in love. It did not end well. [[spoiler:The man she loved, Ozma, died from a fatal sickness. For trying to manipulate the gods into restoring his life, she was cursed with immortality to prevent her from being with Ozma in the afterlife until she learned the importance of life and death. Instead, she incited humanity to rebel against the gods which led to the destruction of humanity and the moon. When the God of Light restored humanity, he gave humanity a single chance to earn redemption and gave Ozma the responsibility of making it happen. By then, however, Salem had dived into the God of Darkness's pools of annihilation; instead of ending her curse as she hoped, it corrupted her into a being of pure destruction. Now Salem and Ozma are bitterly opposed to each other, one trying to unite humanity to save it while the other tries to divide humanity to destroy it.]]
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/BatmanTheAnimatedSeries'':
** 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.
** Other characters that represent this trope are Mr. Freeze and the Mad Hatter.
* ''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/DarkwingDuck'', "[[Recap/DarkwingDuckS1E50TimeAndPunishment Time and Punishment]]", has KnightTemplar [=DarkWarrior=] Duck becoming bad all because of losing his little girl Gosalyn. Even when she turns against him and tries to reset time, he can't bring himself to harm her and breaks down in tears.
* One of the reasons why Trina Riffin from ''WesternAnimation/{{Grojband}}'' changed her name from Katrina and became [[BrattyTeenageDaughter the way she is now]] was so she could win over her crush Nick Mallory.
* ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'' episode "The Cosmic Comet". A ''comet'' goes evil because it lost its love.
* ''WesternAnimation/{{Kaeloo}}'': Mr. Cat wasn't a very nice person to begin with, but it's heavily implied that most of his evil deeds are done for the purpose of pushing Kaeloo past RageBreakingPoint just so she will [[JekyllAndHyde transform into a monster]], who he has a crush on.
* In ''WesternAnimation/TheLegendOfKorra'', [[spoiler: Hiroshi Sato]]'s reason for joining the Equalists was [[spoiler: the murder of his wife by a firebender]].
* 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.
* 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]].
* Nox, the BigBad from ''WesternAnimation/{{Wakfu}}''. His love for his family [[spoiler: that he lost 200 years prior to the show]] drives him to do terrible things. Up to and including genocide.
* ''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.]].
* On ''WesternAnimation/WordGirl,'' [[GadgeteerGenius Tobey's]] villainy seems to be at least somewhat motivated just by [[DatingCatwoman his desire to interact with Word Girl]].
* On ''WesternAnimation/YoungJustice'', this serves as the cover story for [[spoiler:Aqualad's fake FaceHeelTurn in order to go deep undercover]].
[[/folder]]

[[folder:Real Life]]
* John Hinckley, Jr., who shot UsefulNotes/RonaldReagan to impress Creator/JodieFoster. [[CaptainObvious It didn't work.]]
* The infamous [[http://en.wikipedia.org/wiki/Amy_Fisher Long Island Lolita]] case of Amy Fisher. A sixteen year old girl who shot Joey Buttafuoco's wife in the face. Fortunately, she survived. Joey Buttafuoco was having an affair with the teenage girl, despite being twice her age. The case got national attention during the early 90s and many made-for-television movies were created based on the case. These films were famous for starring known eye-candy as Amy Fisher. For example: Creator/AlyssaMilano and Creator/DrewBarrymore.
[[/folder]]

----
Rhei


* ''Fanfic/ChildOfTheStorm'' has, towards the end of the first book and in the sequel, [[spoiler: Harry]] teeter on the edge of this trope. He mentions after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'' - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of the Dark Phoenix. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is definitely a representative example. However, the PowerOfFriendship and ThePowerOfLove hold him in check, as well as that it unnerves him as much as anyone else.

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* ''Fanfic/ChildOfTheStorm'' has, towards the end of the first book and in the sequel, [[spoiler: Harry]] teeter on the edge of this trope. He mentions after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night' Night'' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing [[spoiler: the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'' Realms'']] - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of [[spoiler: the Dark Phoenix.Phoenix]]. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is definitely a representative example. However, the PowerOfFriendship and ThePowerOfLove hold him in check, as well as that it unnerves him as much as anyone else.


* ''Fanfic/ChildOfTheStorm'' has, in the sequel, [[spoiler: Harry]] mention after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'' - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of the Dark Phoenix. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is just one example.

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* ''Fanfic/ChildOfTheStorm'' has, towards the end of the first book and in the sequel, [[spoiler: Harry]] mention teeter on the edge of this trope. He mentions after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'' - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of the Dark Phoenix. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is just one example.definitely a representative example. However, the PowerOfFriendship and ThePowerOfLove hold him in check, as well as that it unnerves him as much as anyone else.

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* ''Fanfic/ChildOfTheStorm'' has, in the sequel, [[spoiler: Harry]] mention after the fact that if his best friend (who he's about one step away from being MindlinkMates with) had died in the ''Bloody Night' arc (which she very nearly did), he was willing to threaten the Council Elite of Skyfathers with his unleashing the Phoenix - risking unleashing the original Dark Phoenix and ''destroying the Nine Realms'' - if they didn't bring her back. That said, he also added that if they'd called his bluff, he'd have gone somewhere else, somewhere safer, before unleashing the Phoenix to do it himself. However, [[spoiler: Thor]] and [[spoiler: Jesus]], somewhat horrified, point out how awful an idea this would have been, risking the DisproportionateRetribution of multiple pantheons of JerkassGods, and the second coming of the Dark Phoenix. While [[spoiler: Harry]] seems to come to accept this, 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 - methodical dismemberment (of a vampire [[spoiler: Dudley Dursley]]) is just one example.


* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be a {{DomesticAbuse}}r from the beginning.

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* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be a {{DomesticAbuse}}r {{Domestic Abuse}}r from the beginning.


* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be given to DomesticAbuse from the beginning.

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* Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be given to DomesticAbuse a {{DomesticAbuse}}r from the beginning.

Added DiffLines:

*Don José in Bizet's ''Theatre/{{Carmen}}'' started out as a simple soldier who intended to marry his childhood sweetheart Micaela. But he was led astray by the FemmeFatale of the opera's title, whose subsequent love for the charismatic bullfighter Escamillo ends up costing her her life through Don José's belief that "IfICantHaveYou, Escamillo can't either!" Unfortunately, the controversial 2018 Florence production {{Flanderized}} Don José's character based on the somber conclusion alone, making him out to be given to DomesticAbuse from the beginning.


* Music/DschinghisKhan's "Der Verräter" (German for "The Traitor") is about a guy, who went AWOL from gate guard duty to see his girlfriend and allowed the enemy to enter the city. Afterwards, he's brought up on charges of treason and sentenced to death by hanging and everybody believes, that him claiming to have been seduced is only a pretext for the collaboration with the enemy and that his real motivation was promises of wealth and honor.

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* Music/DschinghisKhan's "Der Verräter" (German for "The Traitor") is about a guy, guy who went AWOL from gate guard duty to see his girlfriend and allowed the enemy to enter the city. Afterwards, he's brought up on charges of treason and sentenced to death by hanging and everybody believes, believes that him claiming to have been seduced is only a pretext for the collaboration with the enemy and that his real motivation was promises of wealth and honor.

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* Salem from ''WebAnimation/{{RWBY}}'' was once a lonely girl who longed for freedom. She found that freedom in the eyes of the dashing hero who rescued her and fell deeply in love. It did not end well. [[spoiler:The man she loved, Ozma, died from a fatal sickness. For trying to manipulate the gods into restoring his life, she was cursed with immortality to prevent her from being with Ozma in the afterlife until she learned the importance of life and death. Instead, she incited humanity to rebel against the gods which led to the destruction of humanity and the moon. When the God of Light restored humanity, he gave humanity a single chance to earn redemption and gave Ozma the responsibility of making it happen. By then, however, Salem had dived into the God of Darkness's pools of annihilation; instead of ending her curse as she hoped, it corrupted her into a being of pure destruction. Now Salem and Ozma are bitterly opposed to each other, one trying to unite humanity to save it while the other tries to divide humanity to destroy it.]]

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