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5[[quoteright:350:[[WesternAnimation/{{Tangled}} https://static.tvtropes.org/pmwiki/pub/images/rapunzel_moodswinger.png]]]]
6[[caption-width-right:350: Rapunzel does this [[{{Montage}} all within a minute]].]]
7
8->''"You know, I can't help but notice you seem a little at war with yourself here."''
9-->-- '''Flynn Rider''', ''WesternAnimation/{{Tangled}}''
10
11A character whose personality isn't marked by any set mood, but by their tendency to swing between moods drastically. Sometimes (if the characters around them are lucky) there's some sort of warning of an impending mood swing — or at least a recognizable cause — but there may just as easily be no warning whatsoever.
12
13Frequently this is combined with [[http://en.wikipedia.org/wiki/Emotional_lability emotional lability,]] so they skip any emotion that isn't ''extreme''. They're never just happy, they're the cheeriest GenkiGirl in the world. They're never just sad; they're [[DrivenToSuicide on the verge of suicide]]. They're never just angry; they're filled with UnstoppableRage. And they can flip between any of them at a moment's notice. May very well be a one-person FourTemperamentEnsemble or simultaneous [[RedOniBlueOni red and blue oni]].
14
15Though they may be referred to as "bipolar", their mood swings are generally much more abrupt and frequent than the periods of mania or depression associated with real-life [[http://en.wikipedia.org/wiki/Bipolar_disorder bipolar disorder.]] This is also a very common aspect of [[http://en.wikipedia.org/wiki/Borderline_personality_disorder borderline personality disorder]], and it is also a common feature of traumatic brain injuries. We have our own UsefulNotes on UsefulNotes/BipolarDisorder as well.
16
17This is a stereotypical trait of women who are currently [[AllPeriodsArePMS menstruating or suffering from PMS]]. This is TruthInTelevision for many women, though it is neither as universal nor as extreme as lots of fiction portrays it. A common manifestation of monthly emotional instability, both in fiction and in RealLife, is for the affected woman to flip-flop between being ProneToTears and having a HairTriggerTemper. [[PregnancyMakesYouCrazy Pregnant women]] are also known for being {{Mood Swinger}}s.
18
19The Mood Swinger as a LoveInterest frequently fills the role of the {{Tsundere}}. This is also a common trait of TheSociopath and TheCaligula.
20
21For even more extreme cases, see HairTriggerTemper, ProneToTears, SplitPersonality, JekyllAndHyde, TheSociopath, {{Tsundere}} or {{Yandere}}. Not to be confused with MoodWhiplash, which is a trait of the ''storytelling'', not an individual character. They may also end up singing a SongOfManyEmotions.
22
23----
24!!Examples:
25[[foldercontrol]]
26
27[[folder:Anime & Manga]]
28* Alois Trancy of ''Manga/BlackButler''. Throughout the series, he switches from a cute and innocent kid to a very promiscuous child with TroublingUnchildlikeBehavior with a tendency to hit on anything within a five-mile radius, to emotionally vulnerable and sporting BrokenTears, and to LaughingMad and AxCrazy so many times it could make someone dizzy.
29** A rather dark example, since Alois's mood swings tend to be severe MoodWhiplash as well - going from cute and entertaining to TroublingUnchildlikeBehavior with ridiculous speed, and then back again. Not to mention that his extremes can create gems like the time he stopped innocently eating breakfast to [[EyeScream gouge his fingers through a maid's eye]] and then wiped his hand and went back to his eggs.
30* Revy of ''Manga/BlackLagoon'' normally displays a wide range of emotions, all the way from affection to psychotic rage to calm boredom.
31* In ''Manga/DemonSlayerKimetsuNoYaiba'', it is used for comedy effects whenever a scene calls for getting Zenitsu out of his comfort zone, that is getting him to go through a demon slaying mission despite his cowardly tantrums, Zenitsu will go from a seemly well behaved person to an incredibly nervous train wreck, yelling at the top of his lungs about how he is going to die at any second; another is getting him to train under a deadly regime, Zenitsu will immediately lose his mind and curse whoever thought of planning that training session, and when Tanjiro is there to make a counterpoint about how a deadly regime can get them better results at getting stronger, Zenitsu will unleash his fury at someone he once said was his great friend, only to pull a complete 180 degree turn on Tanjiro once he praises Zenitsu for being an important reference to others training as well, making Zenitsu then think his presence at the program really is necessary and that training isn’t so bad after all.
32* Kagura from ''Manga/FruitsBasket''. She seems cute at first, but whenever Kyo's around she becomes a combination of a {{Yandere}} and a {{Tsundere}}.
33** At the beginning at least, Kyo came across as this since he had NoSocialSkills and had a tendency to snap at people he wasn't mad at. So he'd yell at someone, apologize, then yell at them for not understanding him. Then apologize...
34* 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.
35* ''Anime/GaikingLegendOfDaikuMaryu'' has this as the signature trait of BigBad Proist, whose wild mood swings come with a change to her physical appearance. When she's in her calm persona, she leans hard into sex appeal, while she spontaneously becomes hideous whenever she turns into a bloodlust-driven maniac. Part of what makes Proist so dangerous even to her own allies is that there's no consistent trigger for her mood swings.
36* ''Literature/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.
37* ''Manga/JoJosBizarreAdventure'':
38** 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.
39** 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.
40** 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.
41* 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]].
42* [[PhysicalGod Misao Mikogami]] from ''Manga/KamiKaze'' can be a [[GenkiGirl fairly cheerful and fun-loving]] teenage girl, [[TheParagon nice to anyone who needs a hand]], and will stand up for someone when they need it. Say the wrong thing around her and [[HairTriggerTemper her mood will change so fast]] that you won't even have the time to mouth the words OhCrap before you're standing under an ocean of water with your current surroundings gone so far beyond the GodzillaThreshold that you'll be glad you're not around [[ApocalypseHow to see the aftermath]]. [[FromBadToWorse And that's not counting the times]] you've [[UnstoppableRage pissed her off enough]] that she decides [[FateWorseThanDeath to play around with you for a little while]]. She's the ''nicest'' deity [[CrapsackWorld in this series]].[[note]]The nastiest go straight through the MoralEventHorizon on [[ButForMeItWasTuesday your average Tuesday]] and don't even look back [[CrossesTheLineTwice to see where the line went]].[[/note]]
43* Ayukawa Madoka from ''Manga/KimagureOrangeRoad'' is a notable example, but her swings are more day to day than moment to moment. The matter is obviously her frustration because of KyĹŤsuke's indecisiveness and incapacity to reveal his true feelings. Of course, she's the Tsundere leg of the Love Triangle.
44* ''Manga/TheLegendOfZeldaTwilightPrincess2016'': As a teenage boy who has post-traumatic stress and the fate of Hyrule on his shoulders, Link is not exactly the most stable of heroes, and his sudden shifts in demeanor can concern or outright scare his friends. This makes him [[TheCorruptible especially vulnerable]] to getting high on the Master Sword's power, [[spoiler:and a spiral of near-suicidal self-loathing when it rejects him]]. He does even out considerably after the Hero's Shade talks some sense into him, though he still has his moments.
45* ''Manga/MagicalRecordLyricalNanohaForce'' has Curren HĂĽckbein 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.
46* ''Manga/MakeTheExorcistFallInLove'': After being [[spoiler:nearly raped by Asmodeus a second time]], Father snaps and goes on a rampage. During this time, he swings between wearing a SlasherSmile while pounding his foe into a bloody mess, tears of sorrow and fear, childlike amazement at how bright and colorful the world is, and disturbing apathy about the value of others' lives [[DeathIsCheap if he can just revive them afterward.]]
47* Sachiko from ''Literature/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.
48* 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.
49* ''Manga/{{Naruto}}'':
50** Karin has a fluctuating personality, at times appearing stern and tough and {{Tsundere}} and other times appearing carefree and highly flirtatious, but only around Sasuke. She even uses it as a way to escape some guards in Konoha.
51** Jugo has it even worse from a GentleGiant to AxCrazy. He even been named [[RedBaron Jugo "of The Scales"]].
52* ''Anime/NowAndThenHereAndThere'': King Hamdo's moods usually switch from petty, to cruel, to violently moody, to pathetic, and back, usually over the course of a few minutes.
53* Naomi in ''Manga/PsychicSquad'' started off being the calm, sweet girl all the time. Once she realized that her [[DirtyOldMan supervisor Tanizaki's]] [[WifeHusbandry treatment]] of her was why she was having trouble with her powers, she lets loose and from then on shows no restraint in throwing him into a wall when he gets too close. Her CodeName even changes from "Kitty Cat" to "Wild Cat" in the process.
54* ''Anime/SailorMoon'': Usagi tends to switch from being serious to silly and childish in a split second.
55* A good deal of the characters from ''Manga/SayonaraZetsubouSensei''. Namely Kafuka who's somewhat similar to Rena, except she's even more overly optimistic.
56* ''Manga/{{Upotte}}'': Agu (a personification of the Steyr AUG) switches from a shy assault rifle to an overbearing squad automatic weapon with a change of barrel/hairstyle.
57[[/folder]]
58
59[[folder:Comic Books]]
60* ''ComicBook/AstroCity'': Tumorr of the Stone Sea Mages goes from house-rattling death-threat roars to hyperactive glee in the blink of an eye.
61* ''ComicBook/{{Supergirl}}'': In ''ComicBook/GirlPower'' and other early arcs 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.
62* ''ComicBook/TheUnstoppableWasp'': Since Nadia first appeared, it had been shown that she would have amazing periods of giddiness before crashing down into terrible lows. Ultimately, in issue #4 and 5 of her title's second volume, it's discovered that she's bipolar after an attack by A.I.M. causes her to wig out and attack her friends.
63[[/folder]]
64
65[[folder:Fan Works]]
66* ''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 she's adapting.
67* ''Fanfic/CalvinAndHobbesIIIDoubleTrouble'' gives us the [[ExactlyWhatItSaysOnTheTin Mood Swing Babbler]], an alien from [[APlanetNamedZok Planet Zok]]
68* ''Fanfic/ChildOfTheStorm'':
69** During the ''[[DarkestHour Forever Red]]'' arc in the sequel, Strange's mood ticks back and forth like a metronome - one moment, he's addressing [[PhysicalGod Ra]] as "your featheriness", the next he's issuing softly spoken threats of cold-blooded murder. Since his famous foresight is being blocked and it's jumping up and down on {{Trauma Button}}s related to [[MyGreatestFailure his greatest failure]], and he nearly killed himself trying to set it all right, this is not surprising. This is noticed by everyone around him and considered to be deeply disturbing.
70** After the same arc, Harry ends up as this, with Ron explicitly noting at one point that he gets wary when Harry starts acting manically cheerful, because, like a rising broomstick, it's going into a certain dive shortly afterwards. This diminishes significantly as [[MentalHealthRecoveryArc his mental health slowly recovers]], but it's still noted by Clark a good forty-five chapters later.
71* ''Manga/Evangelion303'': Due to her psychological trauma, Asuka's mood could change very, very quickly. She could go from cheerfulness to aggressiveness, restrained calm to unbridled anger, fury to depression or despair to happiness. It could become pretty disconcerting when people met her for the first time.
72* ''Fanfic/TheWizardInTheShadows'' has Harry, the notably unstable protagonist, respond to his circumstances (being trapped in Middle-Earth for years on end) by rapidly cycling through manic cheerfulness, relaxed sarcasm, bitter depression, and UnstoppableRage - and then some. Sometimes, this all happens within the space of a single chapter, and it's noted InUniverse to be somewhat unsettling as no one ''quite'' knows which side of him you're going to see next. He gets better over time, though he remains somewhat odd. [[Creator/NimbusLlewelyn The author]] later revealed that this was a result of his personal CreatorBreakdown during his mid-teens, and its diminishing was a side-effect of his CreatorRecovery.
73* ''Fanfic/ScarTissue'':
74** After Instrumentality, Shinji's mood could change abruptly and instantly when he was pushed the wrong way. He could go from [[TheQuietOne quiet]] to [[TheBerserker maddened berserker]] to depressed to happy to sad in a matter of seconds.
75** Ironically, [[LoveInterest Asuka's]] mood stopped being so [[{{Tsundere}} shifty]]. After [[EndOfTheWorldAsWeKnowIt Third Impact]] she was nearly permanently angry and paranoid. During the fic, she makes an effort to control her temper, and she is constantly gloomy and depressed.
76* ''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.
77-->Congratulations. Over the span of two minutes, you succeed in getting pissed at Karkat, forgiving him, and getting pissed at him again, despite the fact that you have neither spoken to him nor physically seen him for hours.
78-->This is not bipolarity. Bipolarity is a pendulum swinging back and forth, going tick-tock like the beat of a heart, sometimes slowing so that it will be days before the next tick, perigees before the next tock. Sometimes for a time, it freezes in the middle, and you can breathe easy and clear your head. The emotions are not nearly as neat and tidy as a pendulum, but the process, the process is.
79-->This is not bipolarity.
80-->This is insanity. Not the tick-tock of a pendulum but the tacktacktack of a pinball machine. The swings are jagged and irregular, not back and forth but lurching all over creation. You're lucky when you get to hold on to an emotion for more than a fleeting moment.
81-->You haven't been "bipolar" in sweeps. You miss being bipolar. It was better than this unidentifiable monstrosity.\
82No 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.
83-->... Except that you usually switch from one bad mood to another bad mood.
84* In the ''Fanfic/{{Brainbent}}'' canon Sollux has rapid-cycling bipolar disorder, with accompanying psychotic episodes. It's so bad that after one incident where he didn't [[NoMedicationForMe take his medication]] he had to be sent to [[HospitalParadiso St. Lobaf]] for treatment.
85* In ''Fanfic/MegaManReawakened'', Tron Bonne has been like this since Arc 5 began--and it's revealed it's because [[spoiler:she's pregnant]].
86* ''Fanfic/PokemonResetBloodlines'' has the local KnightOfCerebus Belladonna Tyrian, who can easily switch from murderous rage to be very affectionate. This is quickly established in her first encounter with [[TheHero Ash Ketchum]], when as soon as she [[spoiler: realizes they're half-siblings]], she tries to talk and comfort him when just a few minutes ago she intended to ''kill'' him.
87* In ''Fanfic/FracturesSpaceDimentio'', 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.
88* ''Fanfic/RWBYScars'': Weiss often switches between normality and bouts of depression. She's usually content but it's easy to trigger a depressed state, which at her worst can last for weeks. According to the writer, she's schizoaffective but is untreated.
89* ''Fanfic/TurningPoint'': When Dracula and Lisa decide to court a relationship, he offers to wear a muzzle (though Lisa likens it more to a torture device) designed to keep vampires from biting people. He compares the will to feed in vampires to human libidos, can come suddenly without warning and that while he is usually TheStoic, he doesn't trust himself not to attack Lisa at any given moment.
90* ''Fanfic/WhenSheSmilesFreshC'': Asuka soon learns during her therapy seasons that she will not convince their doctors that she is making progress if her emotions are constantly and abruptly changing.
91-->No one can believe you when you're yelling wildly one moment, then claiming to be a person the next. There is no switch you can hit that will take you from being lost to being found. They humored me at first. Their words were soft and mocking. They asked me question after question. Analyzing and scrutinizing every word in every sentence.
92* ''Fanfic/TheManWithNoName'' has the 10th Doctor being this, but not that far from canon.
93* 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.
94[[/folder]]
95
96[[folder:Films — Animated]]
97* Boingo from ''WesternAnimation/{{Hoodwinked}}'' acts like this once he drops his SickeninglySweet 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.
98* After escaping from the tower in which she's lived her whole life without leaving in ''{{WesternAnimation/Tangled}}'', Rapunzel swerves wildly between unrestrained joy at being liberated and crushing guilt at breaking the promise she made to Mother Gothel to never leave the tower. So hilarious was it that it appeared swoop-by-swoop in ''VideoGame/KingdomHeartsIII''. The scene (unedited) can be seen [[https://www.youtube.com/watch?v=00abpt7AVDU here]].
99-->[ecstatic] I can't ''believe'' I ''did this!''\
100[horrified] [-I can't believe I did this.-]\
101[overjoyed] ''I CAN'T '''BELIEVE''' I '''DID THIS!''' ''\
102[appalled] Mother would be so furious.\
103[sitting by pond] But that's okay, I mean, what she doesn't know won't ''kill'' her, right?\
104[sitting in cave] Oh my gosh. This would ''kill'' her!\
105[running through leaves] '''This is sooo funnnn!!'''\
106[[[WallBang leaning on tree]]] I am a horrible daughter. I'm going back.\
107[rolling down hill] '''I am ''never going back!'''''\
108[facedown in meadow] I am a ''despicable human being''.\
109[swinging from tree] '''WOO-HOOOO!! Best! Day! Ever!'''\
110[sitting by rock] *sobbing*
111* "[[https://www.youtube.com/watch?v=moSFlvxnbgk Let It Go]]" from ''{{WesternAnimation/Frozen|2013}}'' is emotionally deep and complicated (part of what may have contributed to its Oscar win), and during some of its most intricate moments [[http://www.naclhv.com/2014/02/elsas-facial-expressions-during-let-it.html Elsa wears many highly expressive faces]] that change nearly second by second. It almost seems like Elsa has mixed emotions. At points, she has the facial expression of outright anger (for instance, when she casts off the gloves and cape), mixed emotions (when she creates Olaf), and outright happiness (when Elsa conjures up the icy staircase to bridge the chasm). And there are lines like "I'm never going back, the past is in the past!" where Elsa really rapidly changes facial expressions: from distress, to resolve, to sorrow, to resolve, to anger, to relief and happiness, regret, and then, as she's about to let down her hair, you see a pained look on her mouth like someone just punched her in the face.
112* Basil from ''WesternAnimation/TheGreatMouseDetective'' certainly swings from manically happy to crushingly depressed and back to manically happy again quickly. Of course, this is because he's based on Literature/SherlockHolmes, who was possibly bipolar, and definitely a massive cocaine addict. So either Basil could use a little lithium, or he's gotten into a bad, mouse-sized vial of seven per cent solution (an expected hazard of living under Holmes' floor).
113* ''WesternAnimation/{{The Hunchback of Notre Dame|Disney}}'': 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.
114* In ''WesternAnimation/MyLittlePonyTheMovie2017'', the [[BigBad Storm King]] is this. He can jump from LaughablyEvil to TranquilFury in the same sentence, for no real reason. This is one of the reasons he's so intimidating: you can never quite tell what he's going to do next.
115* ''WesternAnimation/TheNightmareBeforeChristmas'':
116** Jack Skellington, particularly during his BSODSong, "Poor Jack".
117** The Mayor of Halloweentown, to the point of literally having 2 different faces.
118* ''WesternAnimation/WreckItRalph'': King Candy is known to switch emotions wildly several times within the same sentence - from cheerful giggling to flustered to angry to some more giggling. He can be making puns one second and furiously ordering around his guards in the next. [[spoiler:Even when he briefly drops the King Candy image and shows himself as Turbo, he can't help but snap to gleeful conceit in-between his fury at his plans being unraveled.]]
119* ''WesternAnimation/TreasurePlanet'': According to B.E.N. Captain Nathaniel Flint suffered from this. Seeing how he was in the movie's opening, it's not too far off base.
120* In ''WesternAnimation/TurningRed'', Abby can switch between happy and angry at the drop of a hat. Her very first scene shows her angrily shouting at and scaring some classmates for littering, then cheerfully greeting Mei a few seconds later.
121[[/folder]]
122
123[[folder:Films — Live-Action]]
124* ''Film/AvengersAgeOfUltron'': Ultron himself can go from calm to angry to apologetic right back to angry in seconds. He is a PsychopathicManchild, after all.
125-->'''Ultron:''' ''(after having just sliced off Klaue's arm)'' Ooh, ooh, I'm sorry, it's just, I don't - don't compare me with ''Stark!''
126* ''Film/TheHobbit'': Smaug seems to frequently zig-zag between a FauxAffablyEvil politeness and rampaging wrath.
127-->"''You have '''nice''' manners... for a thief, and a '''[[SuddenlyShouting LIAR]]'''!
128* Paul, later in ''Film/PainAndGain'', due the effects of cocaine (as pointed out by the FunWithSubtitles). He zig-zags between cheerful, remorseful and stoic.
129* Multiple characters in ''Film/TheRoom2003'', but Johnny most obviously. He (in)famously goes from a tirade about how his "future wife" has falsely accused him of domestic abuse to being happy to see his best friend.
130* The titular character in [[Film/JulienDonkeyBoy Julien Donkey-Boy]], being a Paranoid Schizophrenic. His [[CloudCuckooLander eccentric]] Father (Played by Creator/WernerHerzog) also counts, both in a [[MoodWhiplash very]] [[NightmareFuel disturbing]] manner.
131* Gary King in ''Film/TheWorldsEnd'' is this, quickly able to shift from sad and regretful, to serious, to excited and manic (his most common phase). [[spoiler:This is an early hint that all is not right in his head, and he uses his tendencies to help mask some of his deceptions from his friends.]]
132* [[TheHeavy Kylo Ren]] from ''Franchise/StarWars: Film/TheForceAwakens''. He can shift to being {{The Stoic}} to {{The Berserker}} in the drop of a hat. Major example: after a messenger informs him that the droid with the map escaped, he wordlessly launches into a rage-fueled tantrum, slashing a computer terminal over and over again with his lightsaber; after he ultimately stops, he immediately turns back to the messenger and matter-of-factly asks, "Anything else?" - in a calm, even polite tone.
133* ''Film/WonderWoman2017'': Charlie switches between visibly suffering from PTSD and singing like a jolly fellow. And he also has his collected moments.
134* PlayedForDrama in the film of ''Literature/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 [[ThereAreNoTherapists people just don't know what it is.]]
135[[/folder]]
136
137[[folder:Literature]]
138* ''Literature/ACourtOfThornsAndRoses'': Tamlin loses his temper regularly. It gets worse in the second book, on account of his traumatic experiences.
139* ''Literature/HarryPotterAndTheChamberOfSecrets'': Once Harry arrives at the Burrow, Molly switches back and forth between scolding her three sons to welcoming Harry to her home.
140* ''Literature/KeeperOfTheLostCities'': Marella's mother, Lady Redek, has mood swings due to a brain injury from a fall. One character recalls a conversation where she laughed, cried, and screamed at them within minutes.
141* ''Literature/ParadiseRot'': Kyle Brightman has Bipolar II, which is usually represented like this.
142* Vlad Tepes in ''Literature/CountAndCountess'', usually to scary degrees.
143* Tonker in ''Literature/MonstrousRegiment'' has only two moods: calm and berserk. The description used in the book is "has no middle gears."
144* ''Literature/PeterPan'':
145** This is Tinker Bell's original characterization. J.M. Barrie explains that fairies are 'so small they only have room for one feeling at a time.'
146-->"Now, Tinker Bell was not all bad. At least, she was not all bad all the time."
147** Hell, Peter's like this at least as much. Having been raised by fairies may have something to do with it.
148* Less than halfway through the first novel, it's easy to see where theories of ''Literature/SherlockHolmes'' being bipolar come from.
149* Edward Cullen of ''Literature/TheTwilightSaga'' fame is a rather offputting example. He's portrayed as a [[TroubledButCute tortured, yet romantic]] gentleman who has the utmost devotion to Bella...but only when she's [[ExtremeDoormat submissive]]. However, when she puts up even the slightest resistance or actually voices complaints, he quickly goes from a "sensitive" boyfriend to a frothing, rageful lunatic bent on putting her in her place. In addition to his [[ManipulativeBastard manipulative tendencies]], it is because of this that he serves as the perfect candidate for a walking PSA and redflag archive on DomesticAbuse.
150* In ''Literature/RevengeOfTheSith'', Anakin Skywalker isn't too different. His frustrations with the war, the Jedi, what he feels is a lack of respect from said Jedi, and his fears about Padmé's prophesised death mean conversations with him are a veritable minefield. Even Padmé herself isn't safe as the story goes on. Just mentioning she's been talking to a group of senators who aren't happy about the way the war is going is enough to get Anakin to act increasingly hostile. And that's before his FaceHeelTurn.
151%% * Will Herondale from ''Literature/TheInfernalDevices''.
152* [[BastardBastard Ramsay Bolton]] from ''Literature/ASongOfIceAndFire'' and ''Series/GameOfThrones'' has a HairTriggerTemper and can jump from quiet contemplation, to ([[FauxAffablyEvil feigned]]) polite conversation, to [[PsychopathicManchild childlike glee]], to [[AxCrazy psychotic rage]] in a matter of seconds.
153* ''Literature/Birthright2017'': The villain Ko-Kraham switches from cheerful smugness to violent rage, and back again with almost no warning.
154* Janus bet Vhalnich from ''Literature/TheShadowCampaigns'' seems to have a milder version of this. He can go for weeks acting somewhat normally, then be extremely affable for an hour or so, jump straight into raging fury at the drop of a hat, and then go back to affable the following day.
155* Norman Bates from ''Literature/{{Psycho}}'' by Robert Bloch. Bloch sums up Bates' multiple personalities in his stylistic form of puns: "Norman", a child dependent on his mother; "Norma", a possessive mother who kills anyone who threatens the illusion of her existence; and "Normal", a functional adult who goes through the motions of day-to-day life. "Norma" dominates "Norman" much as she had when she was alive, forbidding him to have friends and flying into violent rages whenever he feels attracted to a woman including calling them "whores". "Norma" and "Norman" carry on conversations through Bates talking to himself in his mother's voice, and Bates dresses in his mother's clothes whenever "Norma" takes hold completely. Norman also shows this when he develops attraction to a girl in that he acts like a perfect gentleman, becomes increasingly unhinged while rambling that "we all go a little mad sometimes", [[ThePeepingTom sneaks a peek on them while they're changing]], calls them sluts that are trying to ridicule and laugh at him, becomes his "Norma" persona and either (depending on the version) stabs them to death or cuts them to pieces while they're showering. And then he becomes the benevolent caretaker of Bates Motel again.
156* ''Literature/TheMagicians'':
157** It's mentioned that one of the {{kid hero}}es of the [[Literature/TheChroniclesOfNarnia Narnia]]-[[{{Expy}} esque]] ''Fillory And Further'' novels, Martin Chatwin, suffered from this. By book three, he was known for being able to swing from cheery good humor to chronic depression at the drop of a hat, and his last appearance features him suffering a very public breakdown in which he gets into a fight with his younger brother, rages over being banished from Fillory due to him reaching the age of thirteen, and storms off into the woods - never to be seen again. [[spoiler: It's later revealed that his depressive spells were due to being sexually abused by Christopher Plover, and had come to depend on Fillory as a coping mechanism.]]
158** In a much darker example outside the Fillory novels, [[HumanoidAbomination The Beast]] proves to be terrifyingly mercurial: in his introduction, he paralyzes an entire class full of students, gleefully wastes time around the room, suddenly puts his fist through a clock, and the moment one of the students tries to fight back, he '''eats her alive.''' Then he departs, singing a lullaby. [[spoiler: It's later revealed that the Beast is none other than Martin, having undergone a horrific metamorphosis after delving into the dark magic of Fillory's nastier inhabitants.]]
159* Daylen in ''Literature/ShadowOfTheConqueror'' swings between hopeful optimism, [[{{Pride}} smug superiority]], [[HairTriggerTemper explosive rage]], [[PsychopathicManchild juvenile playfulness]], and [[MyGodWhatHaveIDone paralyzing self-hatred]] practically every few chapters. He also considers Lyrah to be this, due to how [[HamToHamCombat intense]] their conversations get.
160* ''Literature/BazilBroketail'': Hoo, boy. Wiliger is emotionally unstable as hell and switches between being a NiceGuy and a {{Jerkass}} like there's no tomorrow. For example, after his initial bad impression (see EstablishingCharacterMoment entry above) he invites the three eldest dragonboys (Relkin, Manuel and Mono) to an expensive restaurant for dinner and tries to befriend them, but turns hostile again after being informed that his overgrown "109" sign he planned to use is in fact against the regulations. Even his attitude in battle varies as well. He can be either cowardly and prone to panic on one occasion, only to act suprisingly bravely to LeeroyJenkins levels on another one.
161* Franchise/ConanTheBarbarian, as described by his creator Creator/RobertEHoward in his debut story, is a man whose moods are shifting between extremes. He never finds a middle ground between melancholy and mirth: "Conan, the Cimmerian; black-haired, sullen-eyed, sword in hand, a thief, a reaver, a slayer, with gigantic melancholies and gigantic mirth".
162[[/folder]]
163
164[[folder:Live-Action TV]]
165* ''Series/AllThat'' did a sketch called "Ask Ashley", which featured a girl hosting a show from her bedroom where she provides advice for people who are having troubles. Normally she's cutesy and chipper, but after reading a question from a sender, she screams a raging tirade against the author's note. Following such, she's immediately sweet again.
166* Similarly on ''Series/{{Amen}}'', everyone notes Thelma's erratic behavior as hers and Reuben's anniversary approaches. Her father notes to friends Amelia and Rolly that her mother was the same way as ''their'' first anniversary came -- "She was laughing and giggling one minute and throwing pots and pans at me the next. But at least she had a good excuse. She was pregnant." Their eyes widen as they realize that he may have just pinpointed the reason for Thelma's conduct. Sure enough, it turns out she's expecting.
167* ''Series/AshesOfLove'': Su Li swings between screaming in anger, smiling and almost crying in a few minutes.
168* On ''Series/BabylonFive'' [[TheCaligula Emperor Cartagia]] can go from goofing around like a decadent party animal to ordering your execution within the span of five minutes[[note]]five ''seconds'' if you say the wrong thing at the right moment[[/note]]. Suffice it to say, his DecadentCourt has a hell of a time figuring out which way to jump to keep in his good graces.
169* In ''Series/BreakingBad'' and ''Series/BetterCallSaul'', mood-swinging is one of several things that make Tuco Salamanca pants-shittingly terrifying. While he can put on a friendly face, he's one blink away from hospitalizing someone. On-screen, he beats his right-hand man to death for saying something meant to keep Walter White in line, and in ''BCS'', Nacho mentions that Tuco made salsa out of an underling's head with a shotgun due to being on drugs at the time.
170* ''Series/TheCaesars'' depicts [[TheCaligula Caligula]] as one of these; Caligula even says that he uses this to his advantage so that people do not know whether a given act of flattery will please him or anger him, thereby keeping them afraid of him.
171* ''Series/{{Charite}}'' has Emil Behring, jumping from sunny confidence to cold rage to a tearful, ashamed breakdown. He's infamous throughout the hospital for this and often called out on it, but in the late 1880s, few acknowledge that it's an actual psychological issue that should be treated -- it would later come to be known as bipolar disorder.
172--> '''Ida Lenze''': Doctor Behring is as erratic as April weather.
173* ''Series/DeadlyClass'': Maria's bipolar, so when off her meds she varies between affection, gloom and rage dangerously.
174* ''Series/DoctorWho'':
175** [[OmnicidalManiac Davros]] can switch between calm philosophical dialogue, or discussion of his latest plan, and shrieking megalomaniacal ranting, and back again, within the same sentence.
176** [[Recap/DoctorWhoS31E10VincentAndTheDoctor "Vincent and the Doctor"]] depicts Creator/VincentVanGogh this way, switching from moderately functional to inconsolably depressed to battle-ready within minutes. Somewhat TruthInTelevision: The historical Van Gogh was prone to erratic behaviour and sudden bouts of depression or mania, widely theorised to be either bipolar disorder or neurological impairment arising from a metabolic disorder called [[https://en.wikipedia.org/wiki/Acute_intermittent_porphyria Acute intermittent porphyria]] (the same disease that many historians believe King George the Third suffered from), but in real life they cycled over a period of weeks or months.
177* ''Series/{{ER}}''. When Abby's bipolar mother shows up, she's in a manic phase--talking rapidly, throwing herself into various creative projects, etc. Things culminate in her causing a huge disturbance, after which she disappears. When she resurfaces, she's now in the depressed phase and can't even muster the energy to get out of bed.
178* ''Series/{{Friends}}'':
179** Ross was like this between "The One With Ross's Sandwich" and "The One With The Girl Who Hits Joey", as a result of first getting depressed with all the bad things in his life, then snapping and developing his "rage", then being put on medication. This reaches its peak in the latter episode, where he goes from furious that Chandler is sleeping with Monica to delighted that Chandler is in love with Monica in about a second. He calms down a bit after that, but it still flares up sometimes, for instance in "The One Where Ross Is Fine".
180** Phoebe was like this with her pregnancy hormones in "The One With The Worst Best Man Ever". After she goes on an angry rant about how fed up she is with the discomfort of pregnancy Ross tries to calm her down with a cookie, which leads to...
181--->'''Ross:''' Pheebs, did you want a cookie?\
182'''Phoebe:''' [''sobbing''] Thank you so much!\
183'''Rachel:''' So uh, Pheebs, honey, how're those mood swings coming?\
184'''Phoebe:''' [''calmly''] I haven't really had any yet.
185* ''Series/GameOfThrones'':
186** Earlier on in the show, Jaime Lannister displays some of these traits; he goes from sulking over being forced to guard Robert's orgy, to cheerfully reminiscing about crushing Greyjoy's rebellion with Jory, to snapping at Jory for asking him to deliver Ned's message to the king.
187** Joffrey can switch from jovial to intensely angry with frightening speed.
188** Over the course of a single torture session, Ramsay can swing wildly between emotionless droning, absent-minded contemplation, childish glee, and psychotic rage.
189** Lysa, especially towards poor Sansa. It's clear Lysa cares about her, but her jealousy of Littlefinger's affections makes her even more dangerously unstable, when she thinks that he might having an affair with her. In all likelihood, this was probably why Baelish killed her eventually. She goes from gripping Sansa's hands so tightly that it hurts while accusing Sansa of sleeping with Petyr to hugging her niece and telling her everything will be fine and she will be Lady of the Vale someday.
190* ''Series/GeneralHospital'': Laura notes that she keeps bursting into tears over the most minute things. She recalls that the only other time she felt like this was when she was pregnant and with this, realizes that she's pregnant again.
191* The wife of the man with the bazooka round in his chest in the bomb squad episode of ''Series/GreysAnatomy''. She goes from uncontrollable screaming to uncontrollable tears to uncontrollable rage and then back to uncontrollable tears.
192%%* Kevin the Teenager from ''Series/HarryEnfieldAndChums'' is a nightmarish example.
193* Dickie Bennett of ''Series/{{Justified}}'' is a villainous example, who can shift from [[DeadpanSnarker sullen and sarcastic]] to [[FauxAffablyEvil faux cheer]], to {{sadist}}ic rage over the course of a scene. He's also possessed of a distinctly unreliable HairTriggerTemper--sometimes can keep his cool no matter how bad things are getting, while other times the slightest set back will set him off.
194* An eighth season episode of ''Series/LawAndOrder'' has [=McCoy=] and Ross prosecuting a manic-depressive teenager whose wealthy grandfather is hindering the case. The grandfather abruptly launches into a paranoid rant outside the courthouse, tipping off [=McCoy=] to his own manic-depression and giving him an opening to press a better deal for his grandson.
195* ''Series/MontyPythonsFlyingCircus'' has [[https://www.youtube.com/watch?v=K4QAlAjrz38 the man who's alternately rude and polite]].
196* ''Series/MuppetsTonight'' director Nigel suffers from this, going from mellow to hysterical and back again at the drop of a hat. Though working with Franchise/TheMuppets can have that effect on people.
197* A pregnancy example from ''Series/TheNanny''. The combination of her pregnancy and her son moving away to college left Fran's emotions all over the place, pinballing around in seconds.
198-->'''Niles:''' I thought tonight for a celebratory dinner, I would make salmon.\
199'''Fran:''' ''[Morose]'' Oh, no, those poor little salmons. They spend their whole life swimming upstream just to be poached for dinner?\
200'''Niles:''' I was going to barbecue.\
201'''Fran:''' ''[Chipper]'' Ooh, mesquite? With a teriyaki glaze? That would be perfect for Brighton's celebratory dinner. ''[Crying]'' my baby's leaving. ''[Angry]'' Who put their finger in the cake!?\
202'''Everyone else:''' ''[Slightly Confused]'' You did.\
203'''Fran:''' [[HypocriticalHumor Oh, well, aren't we a bunch of moody musketeers?]]
204* ''Series/{{Sherlock}}'''s Jim Moriarty has, to say the least, a habit of doing this. "[[spoiler:SORRY BOYS! I'M SOOOOOO CHANGEABLE!]]"
205* Tyres from ''Series/{{Spaced}}'' does this frequently, with the camera angle often changing with his mood. [[JustifiedTrope Explained]] as a long-term side-effect of taking waaaaaaaaay too much ecstasy.
206* ''Series/TheSuiteLifeOfZackAndCody'' London Tipton. One minute a crazy raging psycho, the next minute a sobbing heap of mush, the next minute icy calm, and finally party-girl cheerful.
207* In the ''Series/StarTrekTheNextGeneration'' episode "[[Recap/StarTrekTheNextGenerationS3E23Sarek 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 [[MentalFusion mind meld]] 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.
208* ''Series/{{Supernatural}}'':
209** Dean Winchester Dean can alternate between enthusiastic and engaging to sullen and withdrawn, sometimes so abruptly that others have trouble keeping up. Sam is accustomed to it, but it is a common source of tension between them. Castiel doesn't understand it, and his attempts to cope with it just lead him into doing things that cause still more mood swings.
210** Lilith, most noticeable in "[[Recap/SupernaturalS03E16NoRestForTheWicked No Rest for the Wicked]]". She goes from serene to downright cheerful to seething to icy-furious in matter of minutes. You never know what she'll do next or how she'll react or (most importantly) what's going to set her off.
211* Cat in ''Series/{{Victorious}}'' can go from happy to sad in under 4 sentences.
212* ''Series/ZyudenSentaiKyoryuger'': In one episode, [[TheDragon Chaos]] acts this way as a result of absorbing a ton of [[EmotionEater emotional energy]] to feed [[BigBad Deboth]], going from anger ("[[TheReasonYouSuckSpeech It's your fault for failing so much!]]") to sorrow (sobbing "Why am I SurroundedByIdiots?") to joy ("Oh well, ItCantBeHelped. Ha ha ha!") in the course of a single conversation.
213[[/folder]]
214
215[[folder:Music]]
216* Music/RelientK: Whoever the song "Mood Rings" was about: "First she's Jekyll and then she's Hyde... at least she makes a lovely pair", indeed.
217[[/folder]]
218
219[[folder:Radio]]
220* ''Radio/BleakExpectations:'' When Harry Biscuit turns evil for a second time, his wife Pippa responds to the news by cycling through a half-a-dozen different feelings in the space of a minute. Her brother Pip, being a Victorian gentleman, is horrified at all the emotion on display, and [[BritishStuffiness declares he's going to go to the pub and not speak to anyone for a month]].
221[[/folder]]
222
223[[folder:Tabletop Games]]
224* ''TabletopGame/{{Exalted}}'': Malfeas is known to be bipolar on a [[MalevolentArchitecture huge scale]], but the real MoodSwinger among the Yozis is Kimbery, whose affections change like the tides -- as soon as she's disappointed by you at all, she goes [[MyBelovedSmother lovelovelovelovelove]][[ThePowerOfHate SOMUCHHATE]]. Being in the second category is a death sentence; the first, a death sentence suspended until you inevitably enter category two.
225* ''TabletopGame/{{Godforsaken}}'': Allafreda's demeanour changes as easily as her shape. She adores you one moment and is bored of you the next.
226* ''TabletopGame/InNomine'': The Archangel Blandine, while more subtle than most examples given her reserved demeanour, is still notable for an emotional state swinging between Pollyanna optimism to utter despair with little warning.
227* ''TabletopGame/{{Munchkin}}'': One of the possible monsters is a "bipolar bear" -- he will attack you furiously or run away, depending on its current mood.
228[[/folder]]
229
230[[folder:Theatre]]
231* Lucy from ''Theatre/{{Thirteen}}'' has this dialogue with her boyfriend:
232-->'''Lucy:''' ...And don't forget to change your facebook status to in a relationship. [[ClingyJealousGirl That way our profiles will be linked together like little love handcuffs]].\
233'''Brett:''' (To Cassie, who is walking by) Oh hi Cassie.\
234'''Lucy:''' Are you '''''flirting''''' with her?!\
235'''Brett:''' No, I was just saying Hi.\
236'''Lucy:''' So you're saying [[HollywoodPudgy I'm fat]]?\
237'''Brett:''' No.\
238'''Lucy:''' Well, you never say anything about how amazing I look anymore.\
239'''Brett:''' Lucy, you are driving me crazy.\
240'''Lucy:''' See? Now that was sweet. And sweet makes me sweet. Got it?\
241'''Brett:''' No.
242* In ''Theatre/ShrekTheMusical'', Fiona seems "a bit bi-polar" during "I Know It's Today".
243[[/folder]]
244
245[[folder:Video Games]]
246* Aerie in ''VideoGame/BaldursGateII'' wavers more or less arbitrarily between "scarred but functional" and "if I can't fly I might as well just kill myself".
247* ''Franchise/BatmanArkhamSeries'':
248** The Joker veers into this in ''VideoGame/BatmanArkhamOrigins'': he can go from cracking jokes to his underlings, to [[DestinationDefenestration shoving a guy out of a window]], to raving about how much he loves the fruitcake. Notably, this is before he's developed his obsession with Batman, which comes at the end of the game.
249** Professor Pyg from ''VideoGame/BatmanArkhamKnight'' is legitimately insane, and one of the most obvious signs is that he can swing through every emotion known to man not only from sentence to sentence, but from '''''syllable to syllable'''''.
250* ''VideoGame/BendyAndTheInkMachine'': Due to having a SplitPersonality, Susie Campbell can alternate between murderous sadism, raw fury, and despaired panic within seconds.
251* The ''VideoGame/DanceDanceRevolution'' announcer, or at least the one from ''DDR Hottest Party''. He lavishes praise on you when you're doing well or even just ''okay'', but the second your dance meter falls into the red he'll angrily demand that you stop sucking. Also, when you idle on the song menu he demonstrates all the patience of a spoiled six-year-old ("'''''Bo-ring!'''''").
252* Firaeveus Carron in ''VideoGame/DawnOfWar'' is a contender for the most dramatic example on this page. He famously goes from sounding mocking and amused, to suddenly exploding into uncontrollable rage, and ending with thoughtful menace, all in ''less than ten seconds'':
253--> Look! Rhinos! ''Rhinos!'' Our enemies hide from us in metal boxes! '''THE COWARDS'''! '''''THE FOOLS'''''! WE... We should take away ''their metal boxes''...
254* Spamton from Chapter 2 of ''VideoGame/{{Deltarune}}'' flip-flops constantly between manic, cheerful friendliness, crushing despair, and murderous rage. If you pick the right dialogue options, he'll occasionally drop his ElectronicSpeechImpediment and quietly beg you for help, before going right back to his mania.
255-->'''Spamton:''' SPEAKING OF [[Communion]] KRIS, DID YOU KNOW THAT THE KNIGHT... No, I'm sorry! I'm sorry! I didn't mean to -- TOO MANY EXCESS VACATION DAYS?? [[ClusterFBomb TAKE A GOD DAMN VACATION STRAIGHT TO HELL]]
256* Anders of ''VideoGame/DragonAgeII'' is stated in the Codex to suffer from manic and depressive phases as of Act III, due to the SanitySlippage caused by his DemonicPossession. His dialogue throughout the game tends to reflect this, ranging from calm and caring, to snarky, to obsessively focused on his goals, to self-righteously grandiose, to self-loathing and miserable, to downright psycho, with alarming speed.
257* ''Franchise/TheElderScrolls''
258** Throughout the series, this is one of the most prominent traits of Sheogorath, the [[OurGodsAreDifferent Daedric Prince]] of [[MadGod Madness]]. He can go from a silly GreatGazoo[=/=]MadHatter one minute to a full blown AxeCrazy, [[KickTheDog Dog-Kicking]], [[ColonyDrop Hurler of Planetoids]] the next.
259--> '''Sheogorath''': "Since you're standing here, I assume you've succeeded. ''Or you're terribly confused''. '''[[SuddenlyShouting OR REALLY LACKING IN GOOD JUDGMENT!]]'''"
260** In the backstory, this was a trait of [[TheCaligula Emperor Pelagius the Mad]]. He would swing to both extremes, going from fully manic to attempting suicide in virtually no time at all. Once his madness became too publicly apparent, he was removed from the throne and institutionalized. Notably, Sheogorath's ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'' quest has you posthumously [[PetTheDog curing Pelagius]] of whatever madness ailed him.
261* Madison Li of ''Videogame/Fallout3'' has a habit of changing her tone from hostile and antagonistic to calm within the same sentence.
262* Noire in ''VideoGame/FireEmblemAwakening'' is notorious for switching between her [[ShrinkingViolet timid and soft-spoken]], and [[BloodKnight violent and loud]] personalities at random times.
263* Catalina in ''VideoGame/GrandTheftAutoSanAndreas'' is easily the ''[[PsychopathicWomanchild most]]'' '''''[[SpicyLatina infamous]]''''' example of this! One moment, she's a psychopathic bitch with ambitions to murder whoever she feels wrong her in even the slightest provocations. The next minute, she tells whoever her partner is that she loves them. Then after that, she claims to not love her partner anymore and considers dating them "just business". The fact that ''she herself'' is uncertain how she feels only exacerbates her behavior.
264* Due to programming, Cole Phelps from ''VideoGame/LANoire''. During interrogations, he'll typically ask a calm, polite question, and then if you select "Doubt" or "Lie", abruptly start screaming obscenities at the suspect, then return to normal for the next question. The UpdatedRerelease recontextualizes this, changing the "Truth/Doubt/Lie" prompts into "Good Cop/Bad Cop/Accuse", making it more clear that Cole is deliberately playing a one-man GoodCopBadCop routine.
265* ''Franchise/TheLegendOfZelda:''
266** The Happy Mask Salesman in ''VideoGame/TheLegendOfZeldaMajorasMask''. There are literally no physical transitions between his extreme emotions.
267** Ghirahim from ''VideoGame/TheLegendOfZeldaSkywardSword'' is an even more extreme example in that he goes from outright furious, murderous, and AxCrazy, to a narcissistic who loudly proclaims his perfection and beauty, to an AffablyEvil and playful antagonist around Link. He once breaks out into a dance.
268* The Whistleblower DLC for ''VideoGame/{{Outlast}}'' has Eddie Gluskin, also known as the Groom. Having been sexually abused by his uncle and father as a child, he became obsessed with sexuality and marriage, and was already a serial killer before coming to the asylum. The experiments conducted on him there only made him worse. When you finally meet him, he has already mutilated and killed dozens of other (male) inmates, turning them into his 'brides' - and he attempts to do the same to you. He fluctuates from using creepily loving endearments ("Darling!") to crazily misogynistic ones ("Filthy sluts. You're like all the others.") to outright death threats ("You don't deserve my children. You don't even deserve to live.")
269* ''VideoGame/PizzaTower'' has the protagonist Peppino Spaghetti, whose entire existence is an unstable mix of anxiety, distress, confusion, enthusiasm, and rage, where he can flip between any of those emotions in a fraction of a second. He can go from pathetic apprehension to wild-eyed fury by the simple expedient of running fast enough. 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]].
270* ''[[Franchise/ShinMegamiTensei Persona]]:''
271** ''VideoGame/Persona3'': While not as extreme as some of the others on the list, Yukari Takeba frequently goes through random moodswings through the course of the game. [[spoiler:Said mood swings get worse in [[PlayableEpilogue The Answer]] thanks to her grieving over the main character's death]].
272*** Perfectly understandable too, given the fact that, before the events of the game, she was (for the most part) a normal teenager.
273** Naoto's Shadow is this in ''VideoGame/Persona4'', alternating between a MadScientist giving the real Naoto a TheReasonYouSuckSpeech and [[ProneToTears bawling their eyes out]].
274* ''Franchise/{{Pokemon}}:''
275** N of ''VideoGame/PokemonBlackAndWhite'' is mentioned by the creators to be moody, though it's hard to tell (and plenty justified) given [[AbusiveParents everything]] [[RaisedByWolves else]] [[TykeBomb that's]] [[HumansAreBastards wrong]] [[BlackAndWhiteMorality with]] [[ManChild him]].
276** Cyrus of ''VideoGame/PokemonDiamondAndPearl'' is revealed in ''Platinum'' to be suppressing his uncontrollable moods, which he believes to be caused by [[StrawNihilist the inherently flawed nature of human spirit]]. It's suggested by his former neighbors that he [[BrokenAce snapped under pressure as a child]] and [[ThereAreNoTherapists never quite got the help he needed]].
277** Wigglytuff in ''VideoGame/PokemonMysteryDungeonExplorers'' has this reputation (along with HairTriggerTemper), though at first, it seems like its an InformedAttribute. [[FailureIsTheOnlyOption After you fail to bring back a Perfect Apple, however]], he ''literally'' almost blows up the guild. Besides that, the aftermath of his CurbStompBattle with Team Skull supports this.
278** According to its ''[[VideoGame/PokemonSunAndMoon Moon]]'' Pokedex entry, Tapu Koko is prone to flying into a rage at even minor inconveniences, but it will often forget why it was angry and calm down just as quickly.
279* ''VideoGame/PrayerOfTheFaithless'': After a certain point in the plot, Trill's emotions while in combat may change from turn to turn, if she's been emotionally destabilized.
280* In ''VideoGame/{{Psychonauts}}'', you delve into the brain of a former actress to control her mood swings. Her mind is represented by a stage where can change the atmosphere from cheery to depressing with a switch.
281* Silver from ''Franchise/SonicTheHedgehog''. When the player sees him, he's usually either moping around or being in-your-face and energetic. Given the pervasiveness and length of time between some of these episodes, it's possible that he's actually bipolar.
282* ''VideoGame/SoulSeries'': Tira is either bloodthirsty-cheerful or bloodthirsty-angry. She can change semi-randomly during a fight.
283** In her second appearance this [[{{Flanderization}} escalated]] from Bipolar to actual split personalities and her [[StanceSystem fighting style changes]] depending on her current mood/personality.
284* Arguably all characters in the Galactic Adventures expansion for ''VideoGame/{{SPORE}}'', as players are only given 5 emotions to work with (happy, sad, angry, scared, and neutral which is just a different version of happy) when making dialogue portions for their user-created missions, and they're all expressed in the most exaggerated way possible without and transitions between them. This also makes certain character types such as the DeadpanSnarker and TheStoic very difficult to portray believably.
285* This is the main gimmick of ''VideoGame/SuperPrincessPeach'': the heroine has four different moods that must be used in various ways. Further invoked by the presence of the Vibe Scepter, which has the power to make ''anyone'' this.
286* Over the course of ''[[VideoGame/ThePark The Park's]]'' relatively short runtime, Lorraine Maillard swings from perfectly rational fear to nostalgia, self-doubt, suicidal self-loathing, bitter resentment, concern, morbid whimsy, and crippling guilt; in one bit of narration, she expresses utter hatred for her son and wishes he was dead - but scant minutes later, goes MamaBear in promising to save him at all costs. [[spoiler: She's actually under the influence of machines used to siphon off positive emotions; as this is a tie-in with ''VideoGame/TheSecretWorld'', the symptoms can also be seen in Nicholas Winter, who goes from blase, to paranoid, to bitterly self-destructive over the course of your time together.]]
287* In ''VideoGame/Road96'', Jarod can swing from bland apathy to a screaming rage to cold Hannibal Lecter-like calm at the drop of a hat. This makes any encounter with him tense as there's no telling what will set him off or whether it's just a matter of time.
288* ''VideoGame/ZeroDivide'': Eve, introduced in the second game, ''Zero Divide 2: The Secret Wish'', is an AI that is made with the intention of replicating the personality of a human being. However, she is shown to have dramatic changes in emotion at the drop of a hat. In the introductory scene before fighting her as that game's final opponent, she will start off speaking nonchalantly, then weeping wondering about why she was created and having to fight in a battle in which it could be destroyed, then suddenly going into maniacal laughter and psychotically proclaiming [[TheAssimilator about assimilating her opponent]], and then back to melancholy.
289[[/folder]]
290
291[[folder:Visual Novels]]
292* Arcueid from ''VisualNovel/{{Tsukihime}}''. Nothing too drastic though, unless you make her really angry.
293* To say that ''[[VisualNovel/DanganronpaTriggerHappyHavoc Danganronpa]]'''s [[spoiler:Junko Enoshima]]'s mood changes on a dime is putting it '''''[[{{Understatement}} very]]''''' [[Main/{{Understatement}} lightly]]. [[spoiler:She gets so soul-crushingly bored that she changes her outward personality at a moment's notice because she becomes disinterested even with how she's presenting herself, cycling rapidly between [[GodSaveUsFromTheQueen a queen]], a [[PunkRock punk]]/[[HeavyMetal metalhead]], a childlike {{moe}}blob, a HotTeacher, [[MascotVillain Monokuma]], really serious and deadpan, really depressed, and finally, her actual personality]].
294* Rena from ''VisualNovel/HigurashiWhenTheyCry''. This and the fact that she's a NightmareFetishist seems innocent enough at first, but then you find out she's GrotesqueCute and CuteAndPsycho, best known as the "Cleaver Girl" for her AxCrazy tendencies. [[spoiler:[[GroundhogDayLoop Sometimes]]]]. The games hint she has a disorder, as she's shown to take pills back when she lived in Ibaraki and suffered from paranoia and hallucinations [[spoiler:caused by Hinamizawa Syndrome, but her doctors had no way of knowing that since only very few people know about its existence so they treated her symptoms instead]]. However, it's exaggerated [[spoiler:especially due to {{Unreliable Narrator}}s]] so it [[RuleOfScary seems freakier]].
295[[/folder]]
296
297[[folder:Webcomics]]
298* [[BigBad Zenith]] in ''Webcomic/CommanderKitty'' is prone to wild mood swings. [[http://www.commanderkitty.com/2010/07/04/nothing-like-a-good-rant/ Watch her go from indignant ranting to happily discussing where to hide her goons]], [[http://www.commanderkitty.com/2011/08/28/process-of-elimination/ or from total despair to omnicidal rage]]!
299* In ''[[Webcomic/DanAndMabsFurryAdventures DMFA]]'', for the 'cubi [[http://missmab.com/Comics/Vol_1207.php it's a racial trait linked to their emotion-based powers.]] A 'cubi is both mercurial and feels emotions more strongly than any other creature or being.
300* In ''Webcomic/DrFrost,'' Seol Song was one. It is ''not'' played for laughs ''at all'', as she was diagnosed with borderline personality disorder.
301* The fairy Red from ''Webcomic/GunnerkriggCourt'' veers between smarmy affection, despondency, and rage. If anything, she gets worse after she [[{{Metamorphosis}} becomes a human]]. ([[TheMindIsAPlaythingOfTheBody Maybe it's the hormones]].)
302** Zimmy is similar, though her personality is a bit more subdued (read: not psychotic). Her mood swings revolve around her friend, Gamma. An in-depth analysis of Zimmy's issues on the matter would make this page about twice as long, but the short version is this: Gamma acts as a grounding wire for the bulk of Zimmy's RealityWarper powers, which she can't control, and thus keeps Zimmy's mind mostly at peace. Zimmy is nonetheless aware that she's not a lot of fun to be around, and is terrified that if Gamma thought she had any other friends, she'd spend her time with them instead of Zimmy. Between this fear, and the power Gamma can't drain away, her overall reaction to the world is erratic and designed to keep people at arms' length by whatever means necessary.
303* Sollux of ''Webcomic/{{Homestuck}}'' has this problem, and tends to lapse in and out of HeroicSelfDeprecation repeatedly. It's part of his overall theme of [[DualityMotif duality]] and bifurcation, as Gemini in the Trolls' WesternZodiac motif.
304** [[spoiler:Sollux's ancestor-descendant Mituna]] also turns the intensity of Sollux's mood swings up a few notches, swinging erratically between being a raving, [[ClusterFBomb foulmouthed]] JerkAss and a cowed, apologetic ExtremeDoormat. [[spoiler:It may not have always been so bad, seeing as he suffered a HeroicRROD that severely crippled his mind before his introduction.]]
305* Jean Poule in ''Webcomic/TheInexplicableAdventuresOfBob''.
306* ''Webcomic/MenageA3'' has Kiley Shefford, a trainee psychotherapist who sometimes seems like she could do with some therapy herself.[[note]]Actually, she admits as much and has been getting both actual therapy and something that she ''calls'' therapy, though not of a conventional kind. [[IntimatePsychotherapy Hint; this is a sex comedy.]][[/note]] Her most dangerous flaw may be excessive but fragile confidence in her own abilities. She [[http://www.ma3comic.com/strips-ma3/all_your_comics jumps from cynical sarcasm to wild enthusiasm,]] [[http://www.ma3comic.com/strips-ma3/or_whatever from tearful panic to jumping someone,]] from "I'm such a good therapist" (strip #515, October 20th, 2011, NSFW) to [[http://www.ma3comic.com/strips-ma3/the_worst_therapist_in_the_world "I'm the worst therapist in the world",]] from [[http://www.ma3comic.com/strips-ma3/okay-sized ecstasy to tears,]] or from [[http://www.ma3comic.com/strips-ma3/calm_down anger to sobbing,]] with minimal provocation.
307* Without Garfield, Jon looks like he has inexplicable mood swings in ''Webcomic/GarfieldMinusGarfield''. [[http://garfieldminusgarfield.net/post/44547555944/g-g-the-book-g-g-on-facebook-g-g-on-twitter Case in point.]]
308* Seppi is one in ''Webcomic/NightmareFactory''. Emai even notes that his mood swings faster than a girl on her period.
309* Jinhui Choi from ''Webcomic/SurvivingRomance'' switches between two moods. Normally she's depressed and down on herself, but give her a sword and she instantly becomes lively and confident.
310[[/folder]]
311
312[[folder:Web Original]]
313* The 20 Questions-playing Website/{{Akinator}} can switch between smug satisfaction and red-hot rage between one question and the next, if what he thought was a perfect guess is thrown off by an answer that doesn't fit the bill.
314* WebVideo/TheNostalgiaCritic. All it takes is one bad move from a film and he'll go apeshit. Case in point?
315-->'''Critic:''' A BAT CREDIT CARD???????!!! I'LL KILL ALL OF YOU!
316-->*3 hours later*
317-->'''Critic:''' Sorry. I just get a little crazy when I see a BAT CREDIT CAR-!!!
318-->*12 hours later*
319-->'''Critic:''' ...RAPE MY CHILDHOOD YOU-
320* PlayedForDrama in WebVideo/DemoReel with Tom Collins. During a phone call message to Donnie, he goes from jovially commenting that SWAG is pretty awesome, to full-blown-stalker threats telling Donnie to not even think about ignoring him.
321* [[https://www.youtube.com/watch?v=LfaRPev8cbA Terry, the Bi Bi-polar Polar Bear]].
322-->'''[[CampGay Terry]]:''' I just want you all to know that I don't care if you're a boy penguin or a girl penguin, I just... Aw, heck, I'm just gonna come right out and say it: I love you all to pieces!\
323'''Penguin:''' Oh, thanks Terry. We all love yo--\
324'''Terry:''' '''GO TO HELL!!''' *Runs off crying*
325* Liu Bei in ''Fanfic/FarceOfTheThreeKingdoms.'' He will start crying at the slightest or no provocation.
326[[/folder]]
327
328[[folder:Western Animation]]
329* ''WesternAnimation/AaahhRealMonsters'' had Ickis, the UglyCute lead with '''serious''' issues. He could go from [[ThisIsNoTimeToPanic nervous stammering]] to [[{{Keet}} bouncing off the walls]] to [[{{Pride}} grossly inflated overconfidence]] and [[OhCrap back]] in minutes. And that doesn't even get into his bouts of [[WideEyedIdealist wide-eyed idealism]] and [[NaiveEverygirl naivete]]...
330** 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 deep and sinister, to SuddenlyShouting and back again at the drop of a hat.
331* ''WesternAnimation/{{Animaniacs}}'' has Mr. Director, who constantly goes from a suave, calm guy who treats comedy as SeriousBusiness to nothing but a TalkativeLoon.
332* ''WesternAnimation/AvatarTheLastAirbender'': Katara is pretty much this trope to a T. Justified given she's a teenage girl who's had a lot to deal with over the last few years.
333** Also Prince Zuko. One minute, he's calm, focused, and disciplined. The next, exploding in a flurry of grunts, growls, and fireballs. Even as a good guy, his mood doesn't improve much until the end. This is why he cannot use Lightning Bending, which requires absolute control over one's emotions.
334* ''WesternAnimation/BatmanTheAnimatedSeries'': [[Characters/DCAUPoisonIvy Poison Ivy]] can switch from [[TheTease sensuous]] [[TheVamp seductress]] to [[AxCrazy manical murderess]] and back again within seconds, as demonstrated in her debut episode [[Recap/BatmanTheAnimatedSeriesE5PrettyPoison "Pretty Poison."]]
335* Caprice from ''WesternAnimation/TheCrumpets'', who is a goth teenage girl, likes to switch from being happy to hostile or suicidal depression. In one example, she happily reads a text message sent to her boyfriend and immediately cries in a sudden after learning it's not spelled correctly. The show's [[http://www.quatre21.com/en/project/detail/crumpets-14/ description provided by its studio]] mentions this trait. Her name is [[MeaningfulName also fitting for this trope]].
336* Lunch Lady from ''WesternAnimation/DannyPhantom'' who switches from kind, grandmotherly figure to full-blown "I'll '''KEEL''' you" mode at the drop of a hat. Her [[spoiler:alternate future daughter]] picked up the habit as well.
337* Peg from ''WesternAnimation/GoofTroop'' can switch from being sweet and happy to terrifyingly angry in the same sentence, and effortlessly move back and forth between them. This usually occurs because she's addressing two parties at once, one she has a beef with and one she doesn't.
338* The titular ''WesternAnimation/InvaderZim''. One minute he'll spout about his next plan of attack, the next minute he'll calmly enjoy a plate of waffles.
339* Heloise from ''WesternAnimation/JimmyTwoShoes'' tends to switch from AxCrazy EnfantTerrible mode, to sweet and innocent mode, to DeadpanSnarker mode, to flirtatiously lovable mode (around Jimmy), to [[HairTriggerTemper pissed off mode]] and back again.
340* ''WesternAnimation/KimPossible'':
341** Doctor Drakken seems to go from mood to mood as an acrobat does on swings.
342** In the episode "Emotion Sickness", Kim and Shego become Mood Swingers thanks to the Moodulators attached to them. Ron and Drakken end up being on the receiving end of all of their emotions.
343* Lola Bunny from ''WesternAnimation/TheLooneyTunesShow'' has a tendency to have little control over her emotions, one moment she can be crying her eyes out and the next she's laughing her ass off. Being a CloudCuckoolander, it could be attributed to her never being entirely sure what's going on around her.
344* In WesternAnimation/MatchboxHeroCity, Bobby, Trey, and Bumper changes reactions to Ghosts throughout the episode.
345* ''WesternAnimation/MiraculousLadybug'': Duusu, kwami of the Peacock Miraculous, can go from exuberant cheer to bawling his eyes out and back again at a moment's notice. Of course, he is the AnthropomorphicPersonification of ''emotion'', so it makes some sense.
346* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
347** In Fluttershy's introductory scene in "Friendship is Magic, Part 1", Fluttershy goes from meek and bashful to gleeful and gushing when she gets a good look at [[CutenessProximity Twilight Sparkle's baby dragon sidekick Spike]]
348** In "Forever Filly", Rarity goes from [[InelegantBlubbering hysterically crying]] over not having had the time to hang out with her little sister Sweetie Belle anymore to gleefully making plans when Sassy Saddles suggests she make the time to visit her.
349--->'''Sassy Saddles:''' [[LampshadeHanging Way to immediately turn that around]]...
350** ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames'' gives us the appropriately named Sour Sweet, who puts on a hint of cloying sweetness before snapping sourly at someone.
351* Hexadecimal in ''WesternAnimation/ReBoot'' has her mood swings lampshaded -- her face consists entirely of a theater mask, and she has to manually wave her hand across it to change its exaggerated expression.
352* Ren from ''WesternAnimation/TheRenAndStimpyShow''.
353-->'''Ren:''' I'm gonna hit-cha! And you're gonna fall. And I'm gonna look down. And I'm gonna '''laugh'''. But '''first... ''first''...!''' I gotta take a whiz! Don't you go anywhere.
354* ''WesternAnimation/TheSimpsons'':
355** In "Smart and Smarter", Lisa, jealous that Maggie might be smarter than her, runs away and takes refuge at the Springfield Natural History Museum. As she goes to sleep on the tongue of a giant model of the human body, Lisa begins badmouthing Maggie before realizing [[VisualPun she's on the "bitter" side of the tongue]]. After moving to the "sweet" side, she starts sobbing and says "I miss them all so much!"
356** In "Crook and Ladder", Homer takes sleeping pills to [[ExactlyWhatItSaysOnTheTin sleep well through the night]], and Lisa reads off the side-effects, one of which is mood swings. Cue Homer repeatedly saying "Mood swings!" in various [[ExactlyWhatItSaysOnTheTin moods]].
357** ''Simpsons'' writer John Swartzwelder noted that he wrote Homer as if he were a "[[DogsAreDumb big talking dog]]":
358--->"One moment he's the saddest man in the world, because he's just lost his job, or dropped his sandwich, or [[BreadEggsMilkSquick accidentally killed his family]]. Then, the next moment, he's the happiest man in the world, because he's just found a penny—maybe under one of his dead family members."
359* ''WesternAnimation/{{Superjail}}'' - The Warden.
360--> (sees dead bunny) "You... sick... bastard." (squishes dead bunny, merrily sends the bunny's kidnapper off in a rocket ship, and holds dead bunny up) "Heeey, little guy! Underneath all that precious fur..." (cuddles dead bunny mournfully) "All scared and all alone..." (pets dead bunny contentedly, starts singing) "If only~ they knew~ what it was like~ to be~ yyyyoooOOOOUUUU!" (rips dead bunny's skin off and gleefully wears it as a hat) "Jared, I want one of these for each and every inmate, not a moment to spare!"
361* Blitzwing the Triple-Changer from ''WesternAnimation/TransformersAnimated'', who switches rapidly between three personalities/moods: [[AnIcePerson Icy]] ([[TheStoic stoic]] and calculating), [[PlayingWithFire Hothead]] (enraged and HotBlooded), and [[GigglingVillain Random]] (who is... well, [[{{Cloudcuckoolander}} Random]]).
362** In [[WesternAnimation/TheTransformers the original series]] [[AxCrazy Galvatron]] would switch moods at a drop of a hat. His moods seemed either insanely gleeful, terrified, sarcastic, calm or enraged. His moodiness is a symptom of his damaged metaprocessor (along with irrational behaviour).
363* ''WesternAnimation/{{Wakfu}}'': Qilby when he's [[OneWingedAngel merged with the Eliacube]]. He's capable of swinging from utter anger to maniacal laughter to being eerily placid (not necessarily in that order).
364* ''WesternAnimation/StevenUniverse'': Blue Diamond is usually in a state of ExcessiveMourning over [[spoiler:Pink Diamond's [[LiterallyShatteredLives shattering]]]] but when [[spoiler:Sapphire says she brought a human for [[PeopleZoo the zoo]]]] even though Blue never gave her an order to she immediately [[TranquilFury hardens]] and when she is given an answer that satisfies her she snaps back to depressed and during [[spoiler:"Rose Quartz's" trial]] she goes from sad to enraged and back several times.
365* ''WesternAnimation/WorkItOutWombats'': Zeke has a lot of emotions and they can all come out at once. He can be mad, sad, and glad all in the space of 5 minutes.
366
367[[/folder]]
368
369[[folder:Real Life]]
370* Ultradian-cycling bipolar disorder (in which the characteristic mood swings take place in periods of days or even hours, rather than weeks as is more typical) somewhat resembles this trope, and as noted above most fictional characters with bipolar disorder are depicted this way despite it being comparatively rare.
371* One of the key symptoms of Borderline Personality Disorder are rapid mood swings that can happen within hours. [[note]]As stated in the DSM-IV manual: "''6. Affective instability due to a marked reactivity of mood (e.g., intense episodic dysphoria, irritability or anxiety usually lasting a few hours and only rarely more than a few days)''".[[/note]] This trope is so much a core indicator of that disorder, in fact, that some propose to change its name to "Emotional (dys)regulation disorder" because the term "Borderline" is outdated and carries too much social stigma.
372** To be clear, the key difference between BPD and bipolar disorder is that mood swings in BPD are ''always'' a response to external stimuli (even if it is something as trivial as your pen being out of ink) while mood swings in bipolar disorder are spontaneous.
373* Some people with PTSD have mood swings as part of the hyperarousal aspect of the disorder.
374* Mood swings lasting at most hours as their symptoms can occur in many mental disorders, including autism, ADHD, and schizophrenia. What's distinctive about bipolar disorder is that the moods tend to be prolonged but distinct from the patient's usual behavior, lasting for days and often weeks and months, and either extremely elevated (irritable or euphoric mood with tons of energy and trying to get lots and lots of stuff done) or depressed (low mood with little energy or only nervous energy).
375* This is also a symptom (and a major red flag) of alcoholism & drug abuse, especially if the person in question wasn't known for being like this in years past.
376* This is a common feature of traumatic brain injuries, along with deficits in social judgment and impulse control, as well as memory, executive functioning, and processing. If someone who has recently had a head injury displays serious mood swings (''especially'' bouts of extreme anger or major depressive episodes), regularly acts in an inappropriate manner (often, but not always sexually), and has a great deal of difficulty with planning out or executing tasks and is easily confused, you are almost definitely looking at a TBI.
377* [[NamesToRunAwayFromReallyFast Ivan the Terrible]] had mood swings as a side effect of the quicksilver he used to treat his pain. One bipolar episode had him beat his son to death in a fit of rage. He reacted with devastating sadness.
378* The stock market is this, embodied by the AllegoricalCharacter [[https://www.investopedia.com/terms/m/mr-market.asp "Mr. Market",]] who makes decision based on emotion and mood. He is also somewhat of a DitzyGenius in that while he reacts quickly to news, sometimes he gets complacent and leaves a gap to be exploited for profit.
379[[/folder]]

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