Examples of fanfiction [[CerebusSyndrome getting progressively more serious.]]

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* [[http://www.fanfiction.net/s/9644493/1/Zenith-Darkness-Reverie ''Zenith, Darkness, Reverie'']], a Death Note fanfiction, commences with a rock-climbing, Redditing nightcore fan locating a Death Note. It's destined to become a relatively light, humorous fanfic, of course. By chapter five (or approximately there), the protagonist is soliloquizing about obliterating humanity. By chapter fourteen, she has [[spoiler: committed over one thousand murders.]]
* ''Fanfic/TheLionKingAdventures'' started off as a cute, comedic adventure series featuring Simba and Nala starting a romance as cubs. However, it evolved into a dark, gritty drama, [[spoiler: rife with character deaths and tragedy.]]
* While the story was never [[http://www.fimfiction.net/story/81159/1/racer-and-the-geek/predawn all that lighthearted]] to begin with, ''FanFic/RacerAndTheGeek'' has definitely [[http://www.fimfiction.net/story/81159/racer-and-the-geek been going this way,]] starting from about chapter 3 with the introduction of gunponies, but with some fairly meaningful {{foreshadowing}} showing up in [[http://www.fimfiction.net/story/81159/2/racer-and-the-geek/midday chapter 2.]] Considering [[http://www.fimfiction.net/user/kalash93 who the author is,]] this is not unexpected.
* Fanfic/{{Pedestal}} started out as a lighthearted fic about the narrator's Franchise/{{Pokemon}} journey. Halfway though, things suddenly get [[DarkerAndEdgier much, much worse.]]
* The ''FanFic/TamersForeverSeries'': the author says it best:
--> ''"When 'Tamers Forever' was originally conceived, it was supposed to be a ten-story series mainly concerning a Takato/Rika relationship. It was supposed to be more of a romantic comedy, however, I realized my strong point wasn't comedy, as I unconsciously deepened and filled the plot with questions and secrets."''
** To give the man due credit though he never completely abandons the humour, in fact several scenes from later books are absolutely ''hilarious''
** The drama is taken UpToEleven during ''Silent Sorrow''
* FanFic/NineKnackeredSouls started as the [[Machinima/RedVsBlue RvB cast]] thrown into the wonderful SugarBowl [[WesternAnimation/MyLittlePonyFriendshipIsMagic world of ponies]], and trying and failing to fit in. [[spoiler: Then Maine appears....]]
* In ''[[{{Fanfic/AceCombatEquestriaChronicles}} Ace Combat: The Equestrian War]]'', despite things going well for the ponies for majority of the war, the griffins always find a way to get them on the edge. Then [[TearJerker chapter 15]] comes.
* ''FanFic/SixDaysTheAnimorphsWereIdiots'' begins as the crackiest of CrackFic, with silly events happening and no real plot to speak of. Marco takes acid and hallucinates the brightly colored clouds on the book covers, Vissers 1 and 3 go on a date, Cassie forms a whale-worshipping cult. But the cast ends up hijacking a Yeerk spacecraft and travel to the Andalite homeworld, and the plot takes a turn for something that would not be out of place in the original book series. The sequel/prequel fanfic, ''[[http://ifi-fics.blogspot.com/2012/05/attack-prolouge.html The Other Attack]]'' begins with roughly the same level of serious that the first fanfic ended with.
* ''FanFic/ClashOfTheElements'' Part 1 starts out with a little bit of humor and some light-heartedness you'd come to expect from a Mario game, but as time goes on and more details get revealed, everything starts becoming rather grim, culminating in the final battle [[spoiler: where everything pretty much goes to hell]] and even when things are resolved it is a rather Bittersweet conclusion...
* ''Fanfic/CalvinAndHobbesTheSeries'' is mostly comedy, but [[DownplayedTrope it gets a fair amount more adventurous with each passing season.]] The {{Season Finale}}s are quite dramatic, however.
** Taken UpToEleven in the SeriesFinale, ''Black Rain'', with an [[spoiler:open that could pass for a slasher film]], and [[spoiler: Dr. Thunderstorm and Shadow possibly ''die'' at the end]]. Oh, and [[spoiler: Slender Man appears. And he's a good guy]].
* ''Fanfic/GodSaveTheEsteem'' begins by exploring the quirks of having {{Daria}} be raised by punks instead of yuppies. By the end, her father has nearly died, Daria has nearly been killed, a friend is in psychiatric treatment [[spoiler:the school has been shut down for good thanks to a prank that Daria pulled on the cheerleaders,]] and martial law is declared, culminating in an epic battle of punks vs. police (with the National Guard preparing to move in).
* ''TheIntercontinentalUnionOfDisgustingCharacters'' is a series about exploiting the loopholes in the 1st Edition [[DungeonsAndDragons AD&D]] rules. But by the middle of ''The Sick Kids'', well ... just try reading the final moments of Sick Sword's life without getting a lump in your throat. (Or the funeral for [[spoiler:Ringman]] in ''The Intercontinental Proliferation of Disgusting Characters''.)
* ''Fanfic/ChildrenOfTime'' is a Series/DoctorWho[=/=]Literature/SherlockHolmes {{Crossover}} that starts goes from typical Doctor Who adventure and angst to DarkerAndEdgier in the three-part finale, helped along by a definite KnightOfCerebus, [[spoiler:Professor Moriarty]]. Holmes himself [[spoiler:does a FaceHeelTurn]].
* ''Fanfic/MyLittleAlicorn'' starts out as a quirky comedy about Celestia being turned into a filly and Twilight and Luna having to put up with her antics while they also struggle to effectively rule the country until they can turn Celestia back to normal. Eventually though, things get ''much'' more serious and dark as we're shown how ''no one'' has forgiven Luna for her crimes as Nightmare Moon, we see just how self serving and manipulative the Canterlot nobility is, Blueblood becomes [[SanitySlippage increasingly violent and deranged]] as he becomes obsessed with getting revenge on the Mane Six for the events of ''The Best Night Ever'', and we get a firsthand look at how dark and graphic [[spoiler:Discord's reign over Equestria, and the war to topple him]] was. And this is all ''before'' [[spoiler:the appearance of an AxCrazy sorcerer who has murdered literally ''millions'' in his quest for immortality.]]
* ''Fanfic/GettingBackOnYourHooves'' begins as a SliceOfLife fic dealing with Trixie...well, trying to get back on her hooves with assistance of the mane six. While some serious moments, its still comical and Trixie's mess ups are presented comically. Then the Cutie Mark Crusaders decide to try and find a camping spot in the Everfree Forest, forcing Trixie and Fluttershy to go on a dangerous adventure to save them...and ''then'' [[BigBad Checker]] [[KnightOfCerebus Monarch]] enters the story and pushes the plot in a direction more in tune with the two parters of the actual series.
* FanFic/TheNuptialverse: The first story, ''Post Nuptials'', is a {{WAFF}} about the Mane Six dealing with the {{Guilt Complex}}es that resulted from not believing Twilight about the imposter Princess Cadence and their friendships coming out stronger for it. Then ''Families'' comes out and, on top of having to still deal with Spike's guilt and Pinkie's personal problems with her family, they also have to deal with a conspiracy to discredit and usurp Princess Celestia [[spoiler: one member of which happens to be Scootaloo's [[AbusiveParents total monster of a father]]]]. And that's not even mentioning the side story ''[[VillainEpisode Metamorphosis]]'', which explores Queen Chrysalis' ''[[DarkerAndEdgier incredibly dark]]'' StartOfDarkness.
* The MLP fanfic ''Trixie has a Problem'', by the author of ''[[AskAPony Twixie Genies]]'', starts out as a comedic SliceOfLife fic where Trixie is accidentally turned into a human, and the hijinks that ensue as Twilight struggles to cure her. [[spoiler:Then Human!Trixie is kidnapped by the Apple Family, who in this story turn out to be ''cannibals''.]]
** And then comes chapter 6, where [[spoiler:''Applejack '''murders''' Twilight'' just because she tried to save Trixie.]]
* Blog/AskJappleack began as a NSFW ask blog. After the success of WebAnimation/PonyDotMov it started developing a plot. A plot which got progressively more dark, serious, and strange.
* The FanFic ''[[http://www.fanfiction.net/s/9308523/1/Sonic-Evil-Reborn-Zero Sonic Evil Reborn Zero]]''. Already a DeconstructionFic, the story makes a sharp turn southward at the start of the second arc when Sonic abruptly, for seemingly no reason, turns towards the dark side to join Eggman and Wikke (it's so abrupt even Eggman isn't prepared) and, immediately after, goes on a genocidal rampage through Station Square. Before this, it had been [[CerebusRollercoaster like a darker Sonic Adventure]] , with some chapters dedicated solely towards comedy and others towards drama, but this was the turning point where it remained dark. Amy's misery makes it worse.
* When Innortal published his first time loop stories, the characters were just screwing around with their cannon. Then Saphroneth came along and started his MyLittlePonyFriendshipIsMagic loops, not only [[TropeCodifier codifying]] the [[FanFic/TheInfiniteLoops Infinite Loops setting]] but [[DeconstructedTrope deconstructing]] parts of the premise, though the plot was still mostly the characters screwing around. The Mega Man loops open with their reboot being represented as a garbled datastream and an entire reality being [[RetGone obliterated,]] necessitating a three-way anchorship and traumatizing Rock, Roll, and Blues.
* In ''FanFic/MegaManDefenderOfTheHumanRace'', post episode 5, the characters' morale and the tone of events in the story have taken an increasingly dark turn. This is best exemplified by the episode 10 epilogue, which is a nonstop string of tragic events.
** Episode 11 is the darkest one yet, but has hopeful moments that become most prominent in chapter 11.
* Happens across the entirety of the ''FanFic/MassVexations'' trilogy. The first two parts are a relatively light-hearted romp through the ''Franchise/MassEffect'' series, with a sense of humor that wasn't afraid to tap into MediumAwareness at some points. [[spoiler:The third fic ends with a Class X-2 ApocalypseHow over Earth.]]
* In ''FanFic/CrownsOfTheKingdom'', the cartoony pratfall type gags taper off as the plot heats up.
* ''FanFic/SonicXDarkChaos'' starts a lot like the original third season of Sonic X. [[DarkerAndEdgier It doesn't take long]] before the heroes realize [[CrapsackWorld just how messed up the galaxy really is]]. And then there's [[WhamEpisode Episode 74]]...
* FanFic/TheDearSweetieBelleContinuity starts out with some family drama but is overall quite optimistic- up until [[Series/DoctorWho Time Turner]] cameos in ''Morning Glory'' to deliver sudden {{Foreshadowing}}, cemented by the very end of ''Phases of the Moon'' ([[AnachronicOrder which takes place first anyway]]). If one reads in publication order, the ending of "The Sin of Envy" has this effect as well, but it is meant to be part of a relatively self-contained arc (and also takes place after the other moments).
* ''FanFic/ConstantTemptation'' is a light-hearted, fluffy RomanticComedy until [[SerialKiller Beyond Birthday]] shows up.
* ''WebAnimation/MyLittlePortal'' is exactly what it sounds like: a fusion of its [[WesternAnimation/MyLittlePonyFriendshipIsMagic name]][[VideoGame/{{Portal}} sakes]], with Twilight Sparkle and various personality cores based on her friends traversing a test course. Sounds like silly fun, right? Aside from occasional dark hints of BackStory and a slightly sinister atmosphere (much like ''VideoGame/{{Portal}}'', at that), it is... for just about four episodes, until we learn just how everypony got there: [[spoiler:Canterlot was sacked by the changelings a decade before and Celestia and Luna were killed, which we get to see in gory detail, and the amnesiac Twilight is expected to be rehabilitated and lead LaResistance]].
* [[https://www.fanfiction.net/s/5789061/1/Hear-my-Song Hear my Song!]] used to be a light-hearted fluffy fic. Then, it started to take the focus off Miku and Luka and [[EnsembleCast onto other characters.]] Though there were a lot of dark points, pretty much everything involving Haku counting as one, things didn't get ''really'' dark until [[KnightOfCerebus IA and Yukari]] entered the plot. And at that point, things went to hell.
* Fanfic/StarWarsLightInDarkTime started out as a lighthearted TrollFic with some CrackFic elements, however, starting from chapter 3 onwards, the series takes a more serious turn, introducing dangerous villains, serious deaths, and a cohesive plot.
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