* Hikaru in ''Fanfic/RevengeRoad'' is jealous of Kyosuke and Madoka for the happiness they share, and kills both of them in revenge.
* Duke in ''FanFic/DecksFallEveryoneDies'', to the point where he wants to kill Tristan.
* [[VisualNovel/HigurashiNoNakuKoroNi Mion]] in the fanfic [[http://www.fanfiction.net/s/6789334/1/GreenEyed_Demon Green-eyed Demon]].
* In the ''FanFic/PoniesOfOlympus'' series, Ran Biao went from Rarity's [[WeUsedToBeFriends friend]] to her [[TheRival rival]] due to being jealous of being AlwaysSecondBest.
** [[spoiler:[[SubvertedTrope Except]], as it turns out, she never cared about that she ''was'', however, jealous of Rarity's relationship with Razorwing, and tried to get them to break up so she could [[AllLoveIsUnrequited have Rarity for herself]]. This [[RapeAsDrama backfired horribly]], and ended up leading to her friendship with Rarity falling apart.]]
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''Fanfic/ADelicateBalance'', Fluttershy isn't at all happy that Twilight's infatuation with Applejack means that they can't spend as much time together. Fluttershy being Fluttershy, she feels awful about the fact that she's putting her own feelings before Twilight's and tries to be supportive of Twilight's relationship anyway.
* Sakura in ''FanFic/AGrowingAffection'' is none too happy that Naruto moved on and started dating Hinata. She does admit to Lee, however, that it might be that LaserGuidedKarma finally caught up to her.
-->''(bitterly)'' "It's funny. He (Naruto) used to like me but I was so busy trying to get Sasuke and he made me miserable. Now I like him but Naruto is with Hinata and they're happy."
* Grimlock in the Transformers fanfic ''[[Fanfic/AChildShallLeadThem A Child Shall Lead Them]]''. He is ''not'' happy when fellow Dinobot, Swoop, ends up getting the Matrix and becoming leader of the Autobots, the position he's always coveted. [[spoiler: He gets better and ends up serving as a mentor figure to his teammate.]]
* Kakashi calls Sasuke out on this in ''Legacy Of The Rasengan:Naruto''. Despite knowing about Naruto's life Sasuke is jealous of Naruto's power. Kakashi points out that A) Sasuke is being very childish (because Naruto has something he doesn't), B) Sasuke knows for a fact Naruto only uses the Kyuubi's charka as a last resort and C) because of B, Naruto works and trains harder than anyone in his age group going so far as to be a CombatPragmatist and ObfuscatingStupidity to get the drop on people.
* Vanitas in the KingdomHearts fic Fanfic/TheShroudedPath had a bad case of this regarding ''[[IJustWantToBeYou Ven's entire life]]''.
* Hefty is this to Empath in ''Fanfic/EmpathTheLuckiestSmurf'', especially when it comes to Smurfette, who passed over Hefty when he originally proposed marriage to her along with his fellow Smurfs because she couldn't decide which Smurf she loved the most at the time.
* In '''Fanfic/GettingBackOnYourHooves'', its revealed that [[spoiler:this is part of Checker Monarch's motivation for ruining Trixie's life: Trixie's her little sister and Checker, being a [[ItsAllAboutMe self centered]] {{Sociopath}}, couldn't stand having the spotlight split between them. However, she's also driven by a [[ControlFreak compulsion to completely control someone's life]] to justify her GodComplex, and Trixie happened to fit the bill.]] The verse's version of Magic Duel also implies that [[spoiler:Checker was jealous that Trixie got into Celestia's School for Gifted Unicorns]].
** Trixie herself has jealousy as one of her main character flaws in this verse. In the original fic, she shows jealousy over Twilight's close relationship with Shining Armor [[spoiler:compared to her [[CainAndAbel relationship with her elder sister]]]] and in ''Fanfic/PerfectCompanions'' she becomes jealous of the rest of the mane six having pets when she doesn't. She also shows jealousy of Twilight getting to perform in front of Celestia and the Saddle Arabian delegates. However, she has a ''lot'' better control over it than she used to before her HeelFaceTurn [[spoiler:or her insane sister has]] and doesn't allow it to override her loyalty to her new friends.
* In ''FanFic/MegaManReawakened'', Wily was insanely jealous of Light, and this led to their falling out.
* In ''FanFic/MegaManDefenderOfTheHumanRace'', Wily's jealousy of Light led to their falling out, and it still motivates him at times.
* The source of Daryan's [[DomesticAbuse abuse]] of Klavier in ''FanFic/DirtySympathy'': Daryan was originally their band's singer and frontman before their label made them switch. The switch became permanent when it was proved that Klavier had better stage presence and better vocal range.
* Robin becomes jealous of Sumia in ''FanFic/{{Pretender}}'' for having Chrom's love and for being married to him. Although he feels very bad that he does and overcompensates by making sure Sumia is well protected in the battle field.
** Sumia is jealous of Robin for taking all of Chrom's attention despite them being recently married and Sumia about to give birth to their first child. She knows that Robin has feelings for Chrom and Chrom keeps trying to get Robin's attention.
** Chrom become jealous of Frederick for seemingly taking his place as Robin's closest friend when Robin starts to become distant when he moves out of Ylissean palace after Sumia and Chrom's marriage.
* In ''FanFic/GraduateMeetingOfMutualKilling'', Ginchiyo was jealous of her sister for receiving the credit and fame for their work. This led her to try to usurp the invitation to Hope's Peak, but when it's revealed it was meant for both of them, she goes back home to tell her sister. The consequences were much more drastic than what she expected.
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