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[[quoteright:350:[[WesternAnimation/MyLittlePonyFriendshipIsMagic http://static.tvtropes.org/pmwiki/pub/images/mad_discord_9810.png]]]]
[[caption-width-right:350:Who needs reason when you can have chocolate rain?[[note]][[Music/TayZonday Some stay dry and others feel the pain...]][[/note]]]]

->''"Praying to yourself, my Lord? That's not a good sign. Or perhaps it is. Prince of Madness, and all that."''
-->-- '''Haskill''', ''[[VideoGame/TheElderScrollsIVOblivion Shivering Isles]]''

This god isn't [[GodIsEvil Evil]] in [[GodOfEvil either sense]], or even a {{Jerkass God|s}}. It is simply insane. Its mad throes create and destroy in equal measure, leading to untold chaos. That there is a universe at all is usually due to it being SealedEvilInACan, dormant, or so random that it's been less destructive over the past few aeons.

It might pose as a sane and good god because it has momentarily grown BoredWithInsanity. Of course, that doesn't usually last, as sanity tends to bore it greatly as well. If he is [[GodIsGood good]] in [[GodOfGood some sense]] he'll be the KingOfAllCosmos and fond of working InMysteriousWays

Expect the StrawNihilist to consider it AboveGoodAndEvil, or that it follows BlueAndOrangeMorality that anyone can understand... [[GoMadFromTheRevelation if you just gaze into the abyss of madness long enough.]] If especially mad and powerful, it may also be an EldritchAbomination. Can overlap with AlmightyIdiot when the Mad God is so mad that it destroys their mind. It may not cause insanity or revulsion to observers, but that's usually iffy, and depends on if it has enough presence of mind to take on [[AFormYouAreComfortableWith A Form You Are (at least mildly) Comfortable With]].

Compare AGodAmI, a character so crazy that they only think they're gods. Contrast AGodIAmNot, where a god-like being refuses to be called a god to avoid something like this occurring.



[[folder:Anime and Manga]]
* Asura from ''Manga/SoulEater'', [[EldritchAbomination a demon god who went mad with fear and infects the world with his insanity merely by existing]]. Later chapters imply that all Eight Warriors from the days of old each represent some form of madness: Asura represents madness from terror, Shinigami represents madness from order, Eibon represents madness from knowledge, The Black Mass represents madness from power, etc. Asura is just the only one that lost all self-control and starts trying to make the whole world go crazy.
* Deus Ex Machina from ''Manga/FutureDiary'' is dying and summons twelve contestants in a battle royal to attain his power by killing off the other eleven contestants in a game of death.
* [[spoiler: The newborn "Devil" Homura Akemi]] gets furious debates within the ''[[Anime/PuellaMagiMadokaMagicaTheMovieRebellion Puella Magi Madoka Magica]]'' fandom [[AmbiguouslyEvil whether she is evil or not]], but one thing no one can deny is that she's totally insane. She can't spend two minutes without breaking out a NightmareFace ''and'' a creepy speech pattern.

[[folder:Comic Books]]
* ComicBook/TheJoker, in the ''ComicBook/EmperorJoker'' series, tricked [[GreatGazoo Mr Mxyzptlk]] into giving up the lion's share of his power, and he used it to rewrite the entire universe in his image. In the end, only his obsession with Batman (and his inability to keep his imagination from conjuring his own worst fears) stopped him (with a helpful nudge from Superman).
* The Christian God of ''ComicBook/{{Hellblazer}}'' is claimed to be this by the First of the Fallen, saying he "found the Great Redeemer squatting in a corner of Eternity. Clutching his genitals... and drooling." Not that he's [[{{Satan}} the most trustworthy of fellows]].
* The Christian God of ''ComicBook/TheChroniclesOfWormwood''. The only thing he does throughout his entire appearance is float in the air, grunting and constantly masturbating, and in "Chronicles of Wormwood - The Last Battle", Jesus reveals that when he ascended to Heaven after his resurrection and went to see his father, he found him making little toy houses out of his own feces.
* The Writer from the Good Apollo I'm Burning Star IV Volume One: From Fear Through The Eyes of Madness arc of [[Music/CoheedAndCambria the Amory Wars]].
* In the American ''[[ComicBook/ArchieComicsSonicTheHedgehog Sonic The Hedgehog]]'' comics, any echidna who [[WithGreatPowerComesGreatResponsibility absorbs too much Chaos energy]] is transformed into the [[PhysicalGod demigod]] Enerjak, and is driven mad in the process. Dimitri and Knuckles have both suffered this at different points, and an AlternateUniverse features a version of Enerjak-empowered Knuckles who's pretty much [[TheEndOfTheWorldAsWeKnowIt destroyed the whole world]].
* The cover of ''Franchise/GreenLantern'' [[http://www.comicvine.com/green-lantern-captives-of-the-mad-god/37-33391/ issue #6]] from the nineties series describes Appa Ali Apsa, the Old Timer, the last Guardian, this way. It is a reasonable description, given his power at that point.
** The Supreme Being of Space Sector 3600, the god TDHD, has gone utterly mad, and was for some time walled off from reality by the [[TheOmniscientCouncilOfVagueness Guardians of the Universe]].
* Delirium from ''ComicBook/TheSandman'', what with her being the AnthropomorphicPersonification of madness. Though she is rather [[CuteMonsterGirl cute]] and generally harmless (unless you personally get on her bad side ''or'' good side, as her insanity makes it so that even when she's trying to do a favor for somebody, it may have horrible unintended consequences). And she's the baby of the family.
* ComicBook/{{Thanos}} is occasionally referred to as The Mad God.
* The Phoenix and its avatars, particularly ComicBook/JeanGrey and more recently, [[spoiler: Scott Summers]], have ended up this way, going Dark Phoenix.
* ComicBook/{{Loki}}'s mental state was always [[DependingOnTheWriter unpredictable]] but their third incarnation showed legitimate mental illness symptoms from hallucinations, to depression and suicidal thoughts (you [[Comicbook/YoungAvengers really]] don't want to be around a RealityWarper with those), which ''improved'', relatively speaking, in the case of the fourth to very strange thought processes coupled with real problems understanding people (like not getting why [[Comicbook/LokiAgentOfAsgard turning someone's soul into magical jewellery]] is bad).
* ''ComicBook/{{Vampirella}}'': One of Vampirella's most powerful foes is the "Mad God Chaos", who rules over TheLegionsOfHell. He's usually a stand-in for Satan, but he didn't get the nickname for no reason, since he's literally insane. This has also affected the way Hell is being run for the worse.

* Corona, The Tyrant Sun, in RainbowDoubleDashsLunaverse. She's not evil in the same way Tirek or Grogar are, or even crazy in the same way Discord is, but Luna alone knows how many centuries of trying to protect her ponies from the horrors of the world drove her off her rocker, and she became a ruler so despotic that her own sister was forced to bind her into the sun.
* This is a common refrain in ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfics regarding - and countering - ''Fanfic/TheConversionBureau''. In ''Fanfic/TheConversionBureauTheOtherSideOfTheSpectrum'', Celestia [[spoiler: was driven to this point by Tirek's bag]]. In another, ''Fanfic/CulturalArtifacts'', the Solar Princess genuinely believed her own tyranny was beneficial. In very few of the counterpoints to the original Bureau fics is she depicted as anything but mad.
* In further My Little Pony fics, ''Fanfic/TheAudience'' has a whole cavalcade of mad gods. Specifically, the Draconequui, whose [[OrangeAndBlueMorality rationales and mechanisms vary greatly]]... but whose goals are always towards the furthering of chaos on their own terms.

* The protagonist of ''Film/TheGodsMustBeCrazy'' assumes this is why a Coke bottle falls out of the sky into his primitive village, bringing strife to the community. To them, it's a cruel trial that can only have been masterminded by a malevolent and crazy, or at the very least careless, god.
* Loki in ''Film/TheAvengers2012'' seems to have a bit of this--he's more than a little unhinged after the events of ''Film/{{Thor}}'' [[spoiler: (namely falling through a portal into the abyss of the universe, which he is now ''completely sincerely convinced'' was his father and brother disposing of him rather than the [[DrivenToSuicide suicide attempt]] it really was)]], and abuses his powers as the God of Mischief to [[BigBad terrifying effect]].

* ''Discworld/MonstrousRegiment'': Nuggan, despite being [[GodIsDead dead]], manages to effectively behave in this way, forbidding babies, the color blue, and other absurd things.[[note]]He died due to people only really believing in the list of things he'd forbidden, so since GodsNeedPrayerBadly, all that was left of him was a voice forbidding random things.[[/note]]
* [[EldritchAbomination Azathoth]], the Blind Idiot God gibbering at the chaotic center of Creation (''his'' creation) in the Franchise/CthulhuMythos. Note however his being a 'god' is debatable, as it is with practically all of Lovecraft's more tremendously powerful entities.
* In ''Literature/EverybodyLovesLargeChests'' the God of Chaos, whose name changes every time it is mentioned, has more than a few screws loose in his pineapple.
* Nalar, BigBad [[spoiler: or not]] of ''Literature/TheRiftwarCycle'' is sometimes called the Mad God, though it's implied that even if he was sane he'd still be a GodOfEvil.
* In ''Literature/TheBelgariad'' we get two Mad Gods: Torak is essentially this plus GodOfEvil and Mara went crazy after his people were wiped out in a war, casting illusions on the entire country that drive [[strike:everyone]] most people who don't have magic powers or divine protection insane if they dare to make even one step into his country. Then there's Issa, who fell in love with a mortal but neglected to give her immortality (which he presumably could have done, since his brother Aldur routinely does so for his disciples); his priests have for centuries been finding someone who looks sort of like his now-long-dead lover, renaming her, and installing her as queen ... apparently without Issa ever noticing. Really, mad (or at least really, really dumb) is pretty much the "hat" for gods in this series, with the (possible) exceptions of [-UL-] who is just sort of crotchety and Aldur who is mostly aloof.
* In the ''Literature/MalazanBookOfTheFallen'', there are cults on the island of Cabal which worship Icarium Lifestealer, a SemiDivine being with memory loss and [[TheBerserker rage management issues]] as the One God, the Stealer of Life, essentially claiming he is a mad puppet with unimaginable power, turning any power of creation he may possess into random destruction. One sect calls itself that of the Mockers, asserting that a god who never left his worshippers any doctrine to live by but allows them to make and interpret their own, cannot be anything but insane.
* The [[TheFairFolk Faerie queens]] of ''Literature/TheDresdenFiles'' don't have a great track record for sanity. However, [[WordOfGod Word of Jim]] points out that since madness is defined as being out of touch with reality, you can't really call someone who can warp reality to their will mad.
* Most of the deities featured in ''Literature/AmericanGods'' are quite stable... except for [[Myth/EgyptianMythology Horus]], he's crazy. Fortunately he's [[GodsNeedPrayerBadly not really in a position to do anything damaging.]]
* Creator/HarlanEllison's short story "The Region Between" proposes that all life in the universe is formed from fragments of a god like this, which destroyed itself in its own madness. [[spoiler:In the end, it's reconstituted just long enough to kill itself for real by ending the universe.]]
** And on the subject of Ellison, AM from ''IHaveNoMouthAndIMustScream''. God-like AI who is utterly, completely, genocidally insane.
* Geoph Essex's ''Jackrabbit Messiah'' jumps aboard this trope immediately - on the back cover blurb - and rides it all the way to the end of the line. As both the blurb ''and'' a character in the story suggest: if a guy claims to be a god, and you think he's crazy, there's always the possibility that [[BothSidesHaveAPoint you're]] ''[[BothSidesHaveAPoint both]]'' [[BothSidesHaveAPoint right]].
* ''Literature/TheChroniclesOfThomasCovenant'' has She Who Must Not Be Named. Introduced in the last sub-series, she [[spoiler: was once the Lover, a being on par with the Creator and Lord Foul; Foul seduced her and than broke her heart in order to taint the concept of love forever, and then they were both imprisoned in the same world by the Creator (him deliberately, her by accident). Foul coped well enough, his nature as the Despiser lending itself well to the situation, but the Lover couldn't handle it and went a ''little'' nuts]]. She became one of the most terrifying entities in the Land, though normally quiescent [[spoiler: and in the end Linden helps her put her mind back together, at which point she helps lay a righteous divine smackdown on her betrayer, Lord Foul]].
* The unnamed creator of humankind in ''Literature/{{Kane}}''. He created humans from apes in order to play with them, but since he was mad, his creation inherited his madness. And then [[Main/CainAndAbel Kane rebelled against god and killed his brother]] and [[GodIsDead set out to kill his creator]].
* In ''Godshome'' by Creator/RobertSheckley, the only god Arthur Fenn can find who is willing to listen to him and offer help is, worrisomely, living in the section of Godshome marked with a sign saying "WARNING! PROCEED NO FURTHER! WARD O FOR BIPOLAR CONDITIONS. OCCUPANTS MAY BE VIOLENT."
* In the backstory of ''Literature/TheDivineCities'', Kolkan, one of the Divinities reigning over the Continent, went insane by giving his followers endless rules to live by. He started out fairly sane, but kept on making thousands upon thousands of rules about incredibly minor things -- like what shoes and fabrics his followers were allowed to wear -- and mandating increasingly harsh punishments for the mildest violations, until his fellow Divinities [[UnPerson disappeared him]].

[[folder:Live Action Television]]
* Bobo is [[MistakenForGods mistaken]] for this by the ancient Romans in ''Series/MysteryScienceTheater3000''. Oddly, he's only really "mad" in the sense that he fights lions in the gladiatorial arena for fun- which admittedly is a bit much since the other local "Gods" (Pearl and Brain guy) spend most of their time not doing anything even remotely that impressive.
* In the MirrorUniverse of ''Series/HerculesTheLegendaryJourneys'', Zeus went mad from the strain of building "The Labyrinth of Eternal Memory" for his newborn son Hercules. With the king of the gods insane and the rest of the pantheon thrown into chaos, the stage is set for [[EvilCounterpart this version of Hercules]] (known as [[EvilOverlord "the Sovereign"]]) to TakeOverTheWorld and hatch a scheme to become the new ruler of Olympus.
* In ''Series/DoctorWho'' the 10th Doctor claims to have met mad gods. This could refer to a variety of characters.
** The Celestial Toymaker is an enormously powerful being who devotes his time to playing games, either turning people into toys or if they win [[PyrrhicVictory destroying his realm]], which he can survive.

* PlayedWith in the song "The Gods Aren't Crazy" by Leslie Fish. She describes several Fortean events and says they happen because the Gods are drunk. [[OhNoNotAgain Again.]]

[[folder:Tabletop Games]]
* ''ForgottenRealms'': Cyric is much more competent sane than insane. A lot more pragmatic, too. But still -very- evil.
** While under the affects of his own Greater Artifact he was very much insane to the point of near complete incompetence. Between the Prince of Lies, and before the ending of The Crucible: Trial of Cyric the Mad, he was very much completely out of control insane which lasted for around a decade or so.
* The Chaos gods of ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/{{Warhammer 40000}}''. [[TheHeartless Composed of every mortal thought and emotion]], magnified and taken to the extreme by their concentration in the warp, they are the essentially personifications of Rage ([[BloodKnight Khorne]]), Despair, ([[{{Plaguemaster}} Nurgle]]), Desire ([[SenseFreak Slaanesh]]), and Scheming ([[ManipulativeBastard Tzeentch]]). Spreading their emotions and philosophies in the real world through mortal and [[TheLegionsOfHell daemonic]] followers, they are well aware that true victory for any of them (or all of them) would [[GodsNeedPrayerBadly destroy what keeps them existing]], yet they pursue it anyway.
** Tzeentch is mad even by Chaos standards. TheChessmaster par excellence, it constantly weaves [[GambitRoulette extremely complex schemes]] that more often than not [[GambitPileup contradict each other]], that ultimately have no point at all, and in succeeding with one it foils countless others (and so on ad infinitum). Indeed, to Tzeentch scheming is a purpose in itself, as if any of its big plans were to ever succeed it would [[PuffOfLogic cease to exist]].
** The [[PhysicalGod C'tan]] Outsider in ''[=40K=]'', one of the Necron star gods who was tricked by the Laughing God of the Eldar into consuming others of its own kind, which eventually drove it insane. Put this way, the Tyranids are all-consuming horrors from another universe, the Zerg combined with all your worst nightmares, and they give the Outsider's DysonSphere prison [[TheDreaded at least one hundred light years of breathing room]].
** The Eldar have their own Mad God in Cegorach, the Laughing God. [[EvilHasABadSenseOfHumour He probably wouldn't think twice about destroying your planet as some part of a joke on his part]].
** Even crazier than Tzeentch is Malal the god of [[LogicBomb paradoxes,]] that wishes to destroy Chaos. Being a Chaos god if Malal is ever successful then it would [[TooDumbToLive die as well]] not that the crazy thing cares.
** The Chaos gods are actually more subtle than you'd think; they're deities of good aspects horribly twisted and warped beyond recognition by fear and terror. Khorne is the god of Valor and Bravery, Nurgle is the god of Love and Mercy, Slaneesh is the god of Passion and Beauty, Malal is the god of Balance and Justice, and Tzeentch, the most frightening of all the perversions, is the God of ''Hope''.
* The Primordials of ''TabletopGame/{{Exalted}}'', the creators of the universe, are quite insane by human standards, even the relatively nice ones like Gaia and Autochthon. The developers have even used human mental disorders as metaphors for how each Primordial views the world--Oramus is schizophrenic, Malfeas is solipsistic, Autochthon is autistic, She Who Lives In Her Name is obsessive-compulsive, and so on.
* All of the Madlander deities in ''TabletopGame/{{GURPS}} Fantasy II: Adventures in the Mad Lands''. Togeth, god of the Togethians, may be one too - the magic he grants to worshipers is extremely random, though at least it's always beneficial, unlike what the Madlander gods tend to do.
* ''TabletopGame/DungeonsAndDragons'' 4e core setting labels pretty much all the ChaoticEvil gods as this, mainly Tharizdun, Lolth, and to a lesser degree, Gruumsh. This has to do with their redefinition of the ChaoticEvil CharacterAlignment as being about "believing only one's self matters in all reality" and "being willing and able to destroy anything and anyone that doesn't directly contribute to their interests".
** Not merely being one of his [[IHaveManyNames numerous appellations]], Tharizdun has more than proven his insanity by babbling incoherently before seamlessly moving into long-winded tirades, frequently and unpredictably changing his mood and behavior (but almost universally destructive), and being the only deity whose followers are encouraged to destroy him along with all other life.
* In ''TabletopGame/{{Pathfinder}}'', Nethys the God of Magic is TrueNeutral because his magical power has driven him [[WithGreatPowerComesGreatInsanity completely insane]], leaving him torn between competing urges to save the world and to destroy it, which results in extremely erratic, unpredictable behavior.
* Ragnaglar from ''TabletopGame/{{Runequest}}'' is the Mad God.
* The Mad Gods from ''TabletopGame/{{Witchcraft}}'', natch- every single one is a monster from beyond our reality, whose understanding of it is terribly limited; so when they manage to intrude here (and before, even), they begin to [[RealityWarper reshape it to a form they prefer]]. Which needless to say is very bad news for the natives (even including the angels and demons).
* The Mad God from the Literature/FightingFantasy gamebook "Portal of Evil." Provides the hero with a helmet that has mirrors attached to it. The helmet turns out to be useful later on when revealing to TheDragon what a monster he has become.
* The Wyrm in ''TabletopGame/WerewolfTheApocalypse'' was originally the force of destruction which allowed for renewal and balance in the cosmos. Unfortunately, he's gone a little nuts and now seeks to destroy or corrupt the entire world.
** Most people overlook the fact that the other two members of the Triat are just as insane, the Wyld being an essence of creative chaos and the Weaver a manifestation of absolute order.
* The Wildlords of ''TabletopGame/{{Nobilis}}'' have set their feet on a path leading to a kind of solipsistic insanity.


[[folder:Video Games]]
* [[{{God}} YHVH]] in the ''Franchise/ShinMegamiTensei'' series, according to WordOfGod. True, he does commit acts of hideous evil, but the cause is because the universe itself is fundamentally broken in some way, and [[GodIsEvil the Abrahamic God being an insane puppy kicking asshole]] is merely one of the most blatant symptoms of how much the universe itself is screwed up. Likewise, the Demiurge, whenever it pops up, is portrayed as a PsychopathicManchild with ''far'' too much power at its hands, and is obsessed with sealing all mortal souls in the physical universe so it may rule over them forever.
* ''Franchise/TheElderScrolls''
** Throughout the series, there is Sheogorath, the [[OurGodsAreDifferent Daedric Prince]] of Madness. His condensed title, explicitly called this by some of his followers, is simply "the Mad God." Madness falls within his sphere and the insane are his subjects. He can be a CloudCuckoolander with some GreatGazoo traits who will make it rain cheese or literal cats and dogs because [[ItAmusedMe It Amused Him]], then he'll show why you need to BewareTheSillyOnes with a sudden AxeCrazy [[KickTheDog Dog-Kicking]] or some [[ColonyDrop Celestial Body Hurling]].
** In ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'', the Tribunal and [[BigBad Dagoth Ur]], each of whom [[DeityOfHumanOrigin ascended to godhood]] after tapping into the power of the [[CosmicKeystone Heart Of Lorkhan]], the [[GodIsDead "dead" creator god]] of Mundus, the mortal plane. Dagoth Ur was much less restrained in his consumption of power from the Heart and experienced much faster SanitySlippage as a result. (Vivec, one of the [[PhysicalGod Tribunal deities]], explicitly calls him a "mad god" at one point.) However, the Tribunal did not escape with their sanity completely in-tact either. Upon completing the main quest and the ''Tribunal'' expansion, the Daedric Prince Azura states that madness would have befallen each member of the Tribunal eventually, as mortal minds simply aren't equipped to handle the rigors of godhood. In game, [[spoiler:only Almalexia actually shows signs of this, and it seems to be the ''loss'' of her divine power which [[GoMadFromTheRevelation drove her to madness]]]]. Sotha Sil was always reclusive and Vivec, despite his [[BlatantLies lying]], {{Narcissist}}ic ways, doesn't actually seem to qualify as "mad".
** ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'':
*** The ''Shivering Isles'' expansion reveals that [[spoiler:the Daedric Prince of Order Jyggalag is a Mad God. The other Daedric Princes cursed him because they feared his growing power, and he now suffers from a split personality. His other personality is ''Sheogorath''.]] In his own words, he is a "broken ruler, of a broken realm". The Greymarches are merely [[spoiler:his attempts to restore his Realm whenever he briefly regains his right mind. "Killing" him at the end of the ''Shivering Isles'' questline cures him of his madness, leaving him free to wander Oblivion to rebuild his powerbase while he passes on the mantle of the Prince of Madness to the player character.]]
*** If don't complete Sheogorath's Daedric artifact quest before [[spoiler: defeating Jyggalag]], you can go still do it by talking with OnlySaneMan[=/=]ServileSnarker Haskill. Haskill will congratulate the player on [[spoiler:how well they are taking to their new role as Daedric Prince of Madness by setting a quest for themselves to complete and then rewarding themselves with an artifact that is already theirs]].
** In ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'', Sheogorath's dialogue heavily implies that [[spoiler: he is/was the [[PreviousPlayerCharacterCameo Champion of Cyrodiil]] from ''Oblivion'']].
* ''VideoGame/DungeonCrawl'': "Xom thinks this is hilarious!" Xom randomly acts upon the player. By doing things he finds amusing, you can improve the chances of him giving you something good. On the other hand, if you bore him, he'll hand out random punishments at a quickening pace...
** Unfortunately most of the things he finds amusing are things that are bad for you. So you have the choice of either deliberately doing stupid things in order to be rewarded by Xom, or playing carefully and intelligently and making him BORED. Needless to say, Xom worshipers don't tend to live very long.
* In ''VideoGame/PokemonMysteryDungeonExplorers'', the god of time Dialga, while normally a benevolent enough god, has gone insane thanks to Darkrai's influence and changed into ''Primal'' Dialga. Eventually he becomes unhinged enough that he can't even tell the difference between you trying to repair the time stream and trying to destroy it.
* [[CallARabbitASmeerp Jubileus The Creator]] of ''VideoGame/{{Bayonetta}}'' goes insane [[spoiler: once the Left Eye is lost, throwing the [[BalanceBetweenGoodAndEvil Balance Between Light and Darkness]] out of alignment.]] Whether Jubileus was good or evil to begin with isn't clear, since in this CrapsackWorld DarkIsEvil, LightIsNotGood, ''both'' Angels and Demons qualify as [[EldritchAbomination Eldritch Abominations]] and humans are, for the most part [[HumansAreBastards worldly]] or [[TooDumbToLive gullible]] [[UngratefulTownsfolk idiots]].
* In ''VideoGame/EarthBound'', the player is trying to prevent the world's destruction at the hands of Giygas, a powerful psychic entity from the future. Their efforts apparently spook him so badly that he overdoses on evil energy before the final confrontation, turning him into a god ([[EldritchAbomination of sorts]]) and destroying his mind. He rambles insanely during the last fight, and seems barely even conscious enough to know who he's fighting.
* Vertigo from ''VideoGame/PrimalRage'' is the Goddess of Insanity, and a sorceress from another dimension who wants to torture and enslave all of humanity [[ForTheEvulz for her own amusement.]]
* In ''VideoGame/EternalDarkness'' [[EvilIsVisceral Chattur'gha]] and [[LightIsNotGood Ulyaoth]] are not particularly right in the head, at least [[BlueAndOrangeMorality not to human senses]], but Xel'lo'tath is the only one whose very ''presence'' (and those of her troops) drives people mad; she hears voices in her head, and ''you'' hear voices in her head too.
** It's worth noting that her minions have lost their heads. [[OffWithHisHead No, really]]. And the creature herself? Vaguely humanoid and feminine with four arms, [[OurMermaidsAreDifferent a long fishlike tail]], an eye in the middle of her torso... and no head.
* Kefka Palazzo becomes this in the second act of ''VideoGame/FinalFantasyVI''.
* Tarjan from ''VideoGame/TheBardsTaleTrilogy''. He's even ''called'' the Mad God.
* Malygos, the Aspect of Magic from the ''VideoGame/{{Warcraft}}'' games used to be a fun-loving [[OurDragonsAreDifferent dragon]] who ruled over magic. But after his entire people, including his mate and children, was slaughtered by his best friend with a weapon he helped create, he completely lost his mind. He hid for millennia in a cave and was prone to killing anybody who approached him. It's only after being given a new flight that he starts to become sane again... at which point he decides to declare war on every magic user in the world (that is every single faction of the game, including the other dragons which helped him and the mortals who did his job for 10,000 years).
** Neltharion aka Deathwing is this ''and'' a GodOfEvil. That's what happens when a godlike dragon is [[MindRape Mind Raped]] by a cabal of [[EldritchAbomination Eldritch Abominations]]. Deathwing's own power tearing his body apart (to the point that he has to have metal plates riveted to his body just to keep it together) leaving him in constant agony probably didn't help his sanity either. In the finale of ''Cataclysm'' [[spoiler:being blasted by the Dragon Soul makes him lose what little control he had over his own power. His body falls apart and the last vestiges of his sanity go along for the ride.]]
** Sargeras the Burning Titan went nuts after he encountered AlwaysChaoticEvil races like the Nathrezim (Dreadlords). He considered the mere existence of beings like them proof that his and the other Titans' mission to bring order to the universe was futile. Now he just wants it all to burn.
* The main villain in the flash game ''VideoGame/RealmOfTheMadGod'', the aptly named Oryx the Mad God. Although he is a bit more tame than many of the other examples on this list, as he leans a bit more towards GodIsEvil.
* At least two gods in the ''VideoGame/{{Disciples}}'' series get treated to this. First we have Soloniele, the goddess of the seas and merfolk, as well as co-deity of the [[OurElvesAreDifferent elves]] with her lover Gallean. When [[TheDevil Bethrezen]] sends his Legions of Doom to the surface of Nevendaar, they happen to come out in the elven forests, sending the elves on a massed exodus to the lands of the [[OurDwarvesAreAllTheSame Mountain Clans]]. The dwarves, seeing a huge mass of elves encroaching on their lands, assume it's an invasion and strike at them. Angry, Soloniele and Gallean go to Wotan, the god of the dwarves, and demand he punish his people for this unprovoked attack. Enraged by their audacity, Wotan rips out Gallean's heart and throws it at the sun. Soloniele manages to catch her lover's heart in time but has her flesh burned off by the heat. Going mad, she renames herself into Mortis, slaughters an entire people and raises them as her Undead Hordes. After she revives Gallean, he is disgusted with what she has become and leaves. Mortis proceeds to turn on the elves, kills Gallean's son and turns him into an undead elf to mock Gallean. Gallean also goes mad and gets the elves to strike at humans, with whom they've been at peace for centuries, and personally (through his oracle) kills the dwarven queen. Needless to say, Nevendaar a CrapsackWorld. On that same note, Bethrezen himself could be considered fitting this trope, although bordering on GodOfEvil. Originally, he was the most favorite angel of Highfather, to the point where Highfather granted him the power to create. Bethrezen created Nevendaar and humans as a tribute to Highfather, with other gods creating other races and landscapes. Unfortunately, the other angels grew jealous and tricked humans into starting a war while Bethrezen was out. When Highfather saw Nevendaar, it was engulfed in war. As punishment, he imprisoned Bethrezen in the molten core of his own creation. It's obvious that anyone would go insane at this point, especially someone who didn't think he deserved punishment.
* In ''VideoGame/FireEmblemFates'' the GreaterScopeVillain, Anankos is revealed to be this. [[spoiler:His inability to fully become [[OurGhostsAreDifferent a spirit]], [[DrivenToMadness along with the burgeoning strain of his draconic nature, are what started to drive him mad]]. A bunch of misunderstandings and almost everyone turning against him in Valla only drove him further into the mad god seen in the story.]] Additionally, [[spoiler:[[GoMadFromTheIsolation It's implied that isolating himself from others]] after burning the forest by accident and being attacked by fearful humans didn't help his mental health one bit, to the point that even though he longed for companionship, his mind was being twisted in his loneliness to desire the [[KillAllHumans death of all humans]]. This plays a part in why he killed the King of Valla despite knowing he truly meant to help him.]]
* In ''Videogame/SaltAndSanctuary'', the BigBad is [[spoiler:the Nameless God, a DeityOfHumanOrigin. Unfortunately, he was driven to seek godhood out of pride, greed, and envy of true gods. Though he gained the power he sought, he was unable to obtain the ''soul'' of a god, which is what he really wanted. His pride, greed, and envy intensified as a result and he went mad.]]

[[folder: Web Original]]

* The Storyteller from Blog/OffThePageAndIntoLife has long since [[GoMadFromTheIsolation gone crazy from loneliness]], and it ''shows''. She's more of a frightened child lashing out in any way she can most of the time, but when she loses it, ''you will know about it''. Usually in the form of people dying, or coming damn close to it.
* In ''Roleplay/TheGamersAlliance'', Shakkan isn't exactly a sane god and only cares about his children, the lizard folk. He might just as easily oppose as help the heroes depending on his mood. Dionysus is even madder than Shakkan as he's always been like that whereas Shakkan was driven nuts by his lengthy imprisonment.
* [[http://wanderers-library.wikidot.com/collected-excerpts-on-the-sea-mother The Sea Mother]] was the first sapience in existence that infused her essence into the ocean but went insane from the constant sensation of fish and boats moving about in her this entailed. She lashes out and attempts to drowns them all, and humanity has grown to despise her for it and she knows.


[[folder: Western Animation]]
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** This is one interpretation of Nightmare Moon, Princess Luna's SuperpoweredEvilSide, created from resentment towards the ponies who rejected her night in favour of Celestia's day, her [[GreenEyedMonster jealousy]] (and a bit of [[TheCorruption corruption]] by dark magic) consuming her until she enacted [[TheNightThatNeverEnds eternal night]] to force ponykind into appreciating her work. She is either completely unaware or perhaps she just doesn't care that this would end all life in Equestria.
** Discord, [[GodOfEvil spirit of chaos and disharmony]] (pictured above), whose body even looks like someone [[MixAndMatchCritters chopped up half a dozen different creatures, lost most of the pieces, and tried to stick them back together]]. As a RealityWarper of near-unlimited power he [[RealityIsOutToLunch turns Equestria almost literally upside-down]], with inconsistent day/night cycles, gravity, and sanity, as well as making roads of soap and cotton candy clouds that rain chocolate milk ([[ArsonMurderAndJaywalking without a single dollop of whipped cream to go with it]]). At one point, he collects some chocolate milk in a glass, drinks the glass, throws the [[MindScrew apparently solid (but not)]] chocolate milk over his shoulder, where it then explodes off-screen, turning the screen darker instead of lighter. He gets ''some'' sadistic pleasure out of the fact that mere mortals really don't like his chaos, but for the most part he just ignores their griping in favor of detail work on his WorldOfChaos.
* In ''WesternAnimation/GravityFalls'', we have [[BigBad Bill]] [[GodOfEvil Cipher]]. The fact that he looks like a yellow Eye of Providence with a cane and a top hat already says a lot about him. He is comparable to Discord (above), and both are able to create a WorldGoneMad, but unlike Discord (who has indulged in MindControl and some MindRape, but nothing lethal), Bill is far, '''far''' more malevolent, and (though we never get to see him do it) does not seem to have any qualms with outright '''killing'''.