[[AC: ''Manga/{{Bleach}}'']]
* In ''FanFic/ProjectTatterdemalion'', a quirk of [[GeneticEngineeringIsTheNewNuke genetically engineered biology]] means that people with PsychicPowers- shinigami and Quincies- really do need caffeine as a basic nutrient, especially when they use their powers a lot. Shinigami in particular also like it because it makes their hearts beat faster- the process that makes them shinigami slows their heartbeats way down, and caffeine brings it back to normal.
** A SugarWiki/MomentOfAwesome from [[TheMedic Isane]] is driven by her need to get coffee - in her ''first appearance'' no less! She just woke up as a Shinigami, isn't very coherent and just wants coffee. A Hollow gets in her way. [[CurbStompBattle You can guess what happens next...]]

[[AC: ''WesternAnimation/ChipNDaleRescueRangers'']]
* ''CDRR'' fanfic authors generally love to give Gadget an addiction to caffeine which is not even hinted at in the show. Examples include [[Fanfic/TheNowakverse John Nowak's stories]].

[[AC: CrossOver]]
* In ''Fanfic/TheMagicOfTorchwood'', Owen runs on coffee. He is annoyed when he is without it. He spreads this irritation around. It is generally considered best to give him coffee to avert this.
* ''Fanfic/ChildOfTheStorm'' has most of the Avengers fitting this trope, with one of Loki's more marketable skills being an excellent coffee maker - and Asgard gets so hooked to it that some characters joke that Nick Fury could get concessions from the Asgardians if he threatened to cut off all coffee trade. Another notable example is Carol, who is ''really'' NotAMorningPerson and requires caffeine to function. She's also capable of downing a steaming hot mug of coffee in one.
* Part 2 of ''WebAnimation/TurnaboutStorm'' starts with [[VisualNovel/AceAttorney Phoenix]] craving for coffee after an almost sleepless night, followed by [[WesternAnimation/MyLittlePonyFriendshipIsMagic Twilight]] telling him nopony has any.
* ''Fanfic/{{Ferris}}'': Bradford loves his coffee. It's later revealed [[MustHaveCaffeine/RealLife he was in the Navy]].
* In the remake of ''FanFic/BattleFantasiaProject'', interfering with exports of [[KlatchianCoffee Turk, Finnish and Italian coffee]] to Equestria is considered attempted murder of Twilight Sparkle, implying she is this. On the other hand, Pinkie Pie is banned from having any coffee whenever she visits Earth.
* ''Fanfic/TheNextFrontier'': [[VideoGame/KerbalSpaceProgram Bob Kerman]] gets through a quite staggering amount of [[CallASmeerpARabbit "a liquid it is convenient to call coffee"]]. No wonder he's so anxious all the time...
* ''Fanfic/ASparkOfGenius'': Xander creates a Starbucks {{Expy}} in the WesternAnimation/JusticeLeague Earth, using his Spark knowledge to make that coffee extra strong. The Flash gets hooked to an ultra-concentrated version of this, enough to make him even more hyperactive than in the series - and when Xander closes down the shops, Flash has to go cold-turkey while the entire world feels the hit (it is mentioned that Xander's company has rapidly become the mayor buyer of coffee beans and purveyor of coffee and coffee-derived products).
* ''Fanfic/ASparkOfIceAndFire'': After [[Webcomic/GirlGenius Agatha]] discovers [[CallARabbitASmeerp wakebean]], she creates the Coffee Engine - which soon becomes a staple of any court meeting.

[[AC: ''Manga/DeathNote'']]
* In the [[AlternateUniverseFic AU]] ''Fanfic/ThoseWhoStandForNothingFallForAnything'' Light and L stop for coffee in almost every chapter. [[BadBoss Light tends to sack people]] [[BerserkButton when he's deprived of his coffee.]] Also coffee is apparently so important to L that when they run out he rushes out to get more--[[AloneWithThePsycho leaving Light alone in the house with B.]]
* Light is a caffeine junkie again in ''[[http://archiveofourown.org/works/616971/chapters/1112940 To Feel Alive]]'' until Ryuk points out that it could have a negative effect on his lifespan.

[[AC: ''WesternAnimation/FairlyOddparents]]''
* In ''FanFic/OriginOfThePixies'', Fergus is very dependent upon his morning coffee and struggles with withdrawal when he goes to long without it.

[[AC: ''Franchise/HarryPotter'']]
* In ''[[Fanfic/ThreeSlytherinMarauders 3 Slytherin Marauders]]'' Harry gave Snape a joke T-shirt one Christmas that sported a caricature drawn by Nymphadora Tonks and the caption "World's Best Father - After Three Cups of Coffee."

[[AC: ''WesternAnimation/TheLegendOfKorra'']]
* Downplayed example, [[TheStoic as befits the relevant character]], in ''Fanfic/AMillionMilesOfFun'': [[DarkActionGirl P'Li]], at three in the morning and after driving for altogether too long, ''really'' wants some chi-enhancing tea.

[[AC: ''Franchise/MarvelCinematicUniverse'']]
* ''Fanfic/InfiniteCoffeeAndProtectionDetail'': Bucky Barnes dearly loves white mochas.

[[AC: ''Franchise/MassEffect'']]
* Even Wrex gets addicted to coffee in ''[[https://www.fanfiction.net/s/6083201/96/Mass-Effect-Newton-s-First-Law Newton's First Law]]''.

[[AC: ''WesternAnimation/MyLittlePonyFriendshipIsMagic'']]
* A cultural trait of the reindeer in ''FanFic/UnderTheNorthernLights''. It is also KlatchianCoffee, at least according to Spike. This is of course because their real life [[FantasyCounterpartCulture counterparts]], the Scandinavians, are heavy coffee drinkers.
* There's also a fic called "Pinkie Pie Discovers Coffee". It does nothing to Pinkie, but HilarityEnsues when Twilight drinks a mocha and ends up just as hyper as her friend.
* ''FanFic/SunsetsLittleTwilight'': The human Pinkie Pie just can't get going in the morning without that first cup of coffee. Ironically, it makes her pony counterpart ''lethargic'', so she drinks decaf instead.
* ''FanFic/ThePiecesLieWhereTheyFell'': [[spoiler:The human Pinkie]] is essentially a zombie before that first cup. [[spoiler:Yes, it's a ShoutOut to ''Sunset's Little Twilight''.]]
* ''FanFic/EscapeFromTheMoon'': In the sequel ''The Mare From the Moon'', Spliced is this in the morning, since she doesn't get a lot of sleep due to her nightmares.

[[AC: ''Manga/{{Naruto}}'']]
* In the cracky fanfic ''Reload'', a GroundhogDayLoop type fic that long ago reached the lets-goof-off stage, we have Sasuke (who is currently female, long story) get up and reach for the nearest cup of coffee. Naruto comments that it was boiling moments ago.

[[AC: ''Anime/{{Pokemon}}'']]
* In the ''Sword and Shield'' Verse, a crime-based ''Anime/{{Pokemon}}'' fanfic, we have [[ActionGirl Brenda]] [[SirSwearsALot Johnson]], our main OC character who's partnered with [[OlympusMons Mewtwo]] aka [[DarkAndTroubledPast Vahan]] [[PsychicPowers Smith]]. Just Brenda, who prefers her coffee "liquid, preferably alive". On the other hand, Mewtwo has stoutly refused to resort to coffee. Brenda considers that a sign of insanity.

[[AC: ''Manga/RanmaOneHalf'']]
* {{Fanon}} likes to ascribe this trait to Nabiki in ''Manga/RanmaOneHalf''.

[[AC: ''Anime/SailorMoon'']]
* [[https://archiveofourown.org/works/2106723 The French Do It With A Press]] has Zoisite a cranky, grumbling mess in the mornings until he's had his coffee.

[[AC: ''TabletopGame/{{Warhammer}}'']]
* ''FanFic/ToyHammer'': Commissar Tomas Sturm takes a liking to Terran "recaff" (a.k.a. coffee).
* Commissar Steve's entire motivation in ''Machinima/ADayInTheLifeOfACommissar'' is getting a cup of coffee. Justified, since his room-mate has night terrors and the beds are uncomfortable, so he barely gets any sleep. He goes completely berserk when he finds out Nathan Johnson, [[spoiler: the Force Commander of the local chapter of the Blood Ravens]], bought all the coffee on the planet. This escalates from teaming up with his SitcomArchNemesis, to challenging Johnson and his two friends ( [[spoiler: The Librarian and Chaplain]]) to a cage match, to demanding the use of a [[TankGoodness Baneblade]] Super-Heavy Tank.

[[AC: ''Series/StarTrekVoyager'']]
* [[https://www.fanfiction.net/s/500680/1/Harry-Kim-The-Goblet-Of-Coffee Harry Kim and the Goblet of Coffee]], shows that Janeway really did beat the Borg with coffee!
* [[https://www.fanfiction.net/s/525231/1/The-Killer-Dame The Killer Dame]] is a parody of the episode "The Killing Game", in which Voyager's crew was brainwashed by the Hirogen into thinking they're characters in a World War II holodeck program. RealityEnsues when Captain Janeway finds to her horror that the only coffee available to civilians in German-occupied France is ersatz coffee made of crushed acorns! When American troops arrive, she's willing to violate her CelibateHero status to get her hands on some real beans (fortunately the Doctor deactivates the brainwashing at that point).
* And [[https://www.fanfiction.net/search.php?keywords=janeway+coffee&ready=1&type=story here's some more stories about the coffee-powered Captain]].

[[AC: ''Series/StarTrekEnterprise'']]
* ''Coffee'' is about Hoshi musing on the joys of coffee.