History Main / MoodSwinger

[overjoyed] ''I can't '''believe''' I '''did this!''' ''\\

[[[WallBang leaning on tree]]] I am a horrible daughter. I'm going back!\\

* ''LightNovel/HaruhiSuzumiya'' comes close. Now she's a cheerful GenkiGirl, the next scene she's [[{{Jerkass}} abrasive, confrontational, dominant, and almost narcissistic]], after that she may become extremely [[TheEeyore melancholic]]. There are reasons for her mood-changes, but sometimes it just appears randomly.

* Sachiko from ''LightNovel/MariaWatchesOverUs'' may be an AloofDarkHairedGirl but she's prone to this nevertheless. She acts aloof or mean randomly and often pushes her friends away. Sachiko herself lampshades this when, in the third season, she questions when Yumi became so good at handling her.

** And then there's the Gromble, the megalomaniacal schoolmaster whose job is to teach Ickis and the other monster students to be terrifying. His demeanor can go from upbeat and flowery, to [[BadassBaritone deep]] and [[GutturalGrowler sinister]], to SuddenlyShouting and back again at the drop of a hat.

* This is lampshaded by Rumble in "Fanfic/CastlingCozyGlow''. Who after seeing Cozy Glow get so angry with him in Cloudsdale she almost outs herself to the nearby ponies, only to go back to her (fake) chipper personality on a dime, he's left unsure if she has terrible control of her emotions or great control of her emotions.

* PlayedForDrama in the film of ''Film/WaterForElephants.'' [[spoiler: August's temper]] is pretty infamous among the other circus workers; he goes from charming and polite to [[HairTriggerTemper violently mad]] in the blink of an eye, and can't seem to control it. While the other workers call him a "paranoid schizophrenic," the setting's time period[[note]] (the 1930s, when proper medical care and especially psychology was just getting started) [[/note]] mostly likely means that ''something'' is wrong with him, but [[AmbiguousDisorder people just don't know what it is.]]

-->You haven't been "bipolar" in sweeps. You miss being bipolar. It was better than this unidentifiable monstrosity.
-->No it wasn't! Ha ha ha, what are you talking about? It was even MORE horrible compared to this! At least this way you're guaranteed to not have to put up with a bad mood very long.

* In ''Fanfic/{{Fractures}}'', after meeting the Off-Colors, her collective traumas have left Pink Diamond to behave rather Bipolar; most days she is kind, supportive and wise to them, other days she goes off to sulk on her own collective hang-ups, ignoring or snapping at any gem that goes to console her.

* ''VideoGame/PizzaTower'' has the protgonist Peppino Spaghetti, whose existence is an unstable mix of anxiety, distress, confusion, enthusiasm, and rage, and can flip between any of those in a fraction of a second. Part of this is the stress of being a struggling restaurant owner. [[ItMakesSenseInContext The other part is the threat of having said restaurant vaporized by a talking pizza]].

* ''WesternAnimation/BatmanTheAnimatedSeries'': Poison Ivy can switch from [[TheTease sensuous]] [[TheVamp seductress]] to [[AxCrazy manical murderess]] and back again within seconds, as demonstrated in her [[Recap/BatmanTheAnimatedSeriesE5PrettyPoison debut episode "Pretty Poison."]]

* ''Series/{{Sherlock}}'s'' Jim Moriarty has, to say the least, a habit of doing this. "[[spoiler:SORRY BOYS! I'M SOOOOOO CHANGEABLE!]]"

* In the ''Series/StarTrekTheNextGeneration'' episode "Sarek", the titular Vulcan Ambassador (and father of [[Series/StarTrekTheOriginalSeries Spock]]) is suffering from Bendii Syndrome, which causes him to lose control of his emotions that Vulcans are legendarily known to suppress with great will. Even worse, he's also psychically spilling it out into the crew, causing a fist fight in Ten Forward and causing Riker and Picard to get into a screaming match. Ultimately, Picard convinces Sarek to perform a MindMeld with him so that Sarek can perform his duties without his emotions wrecking everything and Picard can hold on to those emotions. This leads to Picard going through this trope as all of Sarek's emotions about his family and the loss of control hit him like a train.

* ''Fanfic/ACrownOfStars'': During her first day in Avalon Asuka’s mood is changing constantly from bitter and weary to smirking and bubbling to angry to serious. Shinji notes that her moods are changing very quickly and he does not know how adapting.

* ''Manga/{{Evangelion 303}}'': Due to her psychological trauma, [[{{Tsundere}} Asuka's]] mood could change very, very quickly. She could go from [[http://eva303.smackjeeves.com/comics/907463/023/ cheerfulness to aggressiveness]], [[http://eva303.smackjeeves.com/comics/1743749/036/ restrained calm to unbridled anger]], [[http://eva303.smackjeeves.com/comics/1770002/051/ fury]] to [[http://eva303.smackjeeves.com/comics/1770004/053/ depression]] or [[http://eva303.smackjeeves.com/comics/1794693/027/ despair]] to [[http://eva303.smackjeeves.com/comics/1795228/064/ happiness]]. [[http://eva303.smackjeeves.com/comics/907464/024/ It could become pretty disconcerting when people met her for the first time.]]

* [[Webcomic/{{Homestuck}} Sollux]] is this in canon, but even more so in the fanadventure ''Webcomic/BeTheSeaDwellerLowblood''. He and Karkat will get in a fight, one of them will apologize, the other won't accept, then the second one apologizes and the first one ignores him, they get into another fight, one of them will apologize but be rejected ''again'', one will think about apologizing but change his mind, one will beat himself up over not apologizing sooner but then not go through with it, etc, etc, etc.

* [[TheCaligula King Hamdo]] from ''Anime/NowAndThenHereAndThere'' takes this trope to terrifying extents. His moods usually switch from petty, to cruel, to violently moody, to pathetic, and back, usually over the course of a few minutes.

* [[GenkiGirl Usagi]] from ''Anime/SailorMoon'' tends to switch from being serious to silly and childish in a split second.

* ComicBook/{{Supergirl}}: In the first issues of [[ComicBook/Supergirl2005 her Post-Crisis series]] the titular heroine suffered wild mood swings, going from fury to happiness to fury to gloominess in a single scene. Later it was revealed she suffered from Kryptonite poisoning which altered her behavioral pattern.

* [[Webcomic/{{Homestuck}} Sollux]] is this in canon, but [[UpToEleven even more so]] in the fanadventure ''Webcomic/BeTheSeaDwellerLowblood''. He and Karkat will get in a fight, one of them will apologize, the other won't accept, then the second one apologizes and the first one ignores him, they get into another fight, one of them will apologize but be rejected ''again'', one will think about apologizing but change his mind, one will beat himself up over not apologizing sooner but then not go through with it, etc, etc, etc.

* Boingo from ''WesternAnimation/{{Hoodwinked}}'' acts like this once he drops his TastesLikeDiabetes facade and starts acting like a supervillain. The commentary remarks that on one occasion they couldn't decide which take to use (maniacal, verge of tears, etc), so they just decided to string them all together to very good effect.

* Yuno of ''Manga/FutureDiary'' often can go from a [[{{Moe}} sweet, lovable and huggable darling]] to [[AxCrazy a murderous and terrifying psychopath]] on a whim,[[note]]or even ''both''[[/note]] and usually [[MoodWhiplash in the span of a single episode]]. Most of the time, all it takes is either [[ViolentlyProtectiveGirlfriend threatening]] or [[ClingyJealousGirl flirting with]] Yukiteru.

%%* Harry of ''Manga/OutlawStar''.
* A good deal of the characters from ''Manga/SayonaraZetsubouSensei''. Namely Kafuka who's somewhat similar to Rena, except she's even more overly optimistic.
* Kamille in ''Anime/MobileSuitZetaGundam'' can go from personable and friendly to teenage angst-fest in the blink of an eye (NotHyperbole). It's oftentimes difficult to tell what exactly set him off.

* ''Manga/JoJosBizarreAdventure'':
** ACDC from ''Manga/JojosBizarreAdventureBattleTendency'', even admitting that he's the most emotional of the Pillar Men. When Joseph [[spoiler:cuts off his arm and destroys it so he can't reattach it]], his reaction is to... [[InelegantBlubbering burst into tears and cry like a little girl]], and then after a while stop as quickly as he started and claim he was just blowing off steam. This actually makes him dangerous; Joseph reads his opponents to get the upper hand on them, but it's impossible to read ACDC's constant mood shifts.
** Jolyne's cellmate [[StarterVillain Gwess]] from ''Manga/JojosBizarreAdventureStoneOcean'', an [[PsychopathicManchild insane]] LivingDollCollector who acts kind and friendly before turning angry and murderous in the next.
** Thunder [=McQueen=] from ''Stone Ocean'', a PsychopathicManchild who's easily brought to tears from joy or sadness. When Ermes first meets him he bursts into tears over forgetting where he hid his stolen money, then when she shows concern he begins gushing over how he'd like to marry a woman like her before immediately lamenting that it'll never happen and [[DrivenToSuicide attempting to kill himself]]. Granted he had valid reasons to be upset considering he was imprisoned for a crime he didn't commit, but it's made clear that it's partially due to him being HisOwnWorstEnemy.

* ''Manga/MagicalRecordLyricalNanohaForce'' has Curren Hückbein and Cypha. Cypha is TheStoic, but she often switches to her sadistic AxCrazy persona when she's in a battle. The BigBad Curren can be very childish, acts as a cute and sweet woman, only to switch to her dark, intimidating, creepy persona, then back and forth.
* Kaguya from ''Manga/KaguyaSamaLoveIsWar'' is susceptible to changing emotions at the drop of a hat, something which is attributed to her less than stellar upbringing. This usually takes the form of a RunningGag where someone (most often Fujiwara) will get close to Kaguya's LoveInterest Shirogane, causing her to mentally curse them and call them scum; the victim then does something to get back into Kaguya's good graces, which causes her to fawningly act like they're best friends for life[[note]]To name one example, Shirogane shares some of his box lunch with Fujiwara, making Kaguya thinks to herself that the girl is a worthless parasite, but when Fujiwara shares the food with Kaguya suddenly she's tearfully apologizing for the earlier insult[[/note]].
* Sachiko from ''LightNovel/MariaWatchesOverUs'' may be an AloofDarkHairedGirl but she's prone to this nevertheless. She acts aloof or mean randomly and often pushes her friends away. Sachiko herself lampshades this when, in the third season, she questions when Yumi became so good at handling her.
* [[GenkiGirl Usagi]] from ''Anime/SailorMoon'' tends to switch from being serious to silly and childish in a split second.

** ''WesternAnimation/MyLittlePonyEquestriaGirls'' gives us the appropriately named Sour Sweet, who puts on a hint of cloying sweetness before snapping sourly at someone.

* ''WesternAnimation/TheHunchbackOfNotreDame'': Clopin, being the LargeHam he is, can go from very bombastic to laid-back at the drop of a hat, which can mostly be chalked up to him being a performer.

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