An informal, ad hoc system of tagging that has spontaneously evolved over the years within the greater FanFic community.

These tags are concatenated and prepended to a character name, separated by exclamation marks: for example, ''Angry!Uber!Harry.''

Common tags include:

* ''Angry'': The character is more prone to anger and rage than in {{canon}}. This is a common attribute for Literature/HarryPotter in fics set after ''The Order of the Phoenix''.
* ''Angsty'': Used to indicate the character will be excessively distraught during the fic.
* ''Canon'': Obviously used to denote that the author is trying to stick as close to the canon character as possible. (See OriginalFlavor.)
* ''Dark'': A heroic character is made evil -- [[AntiHero or at the least considerably more ruthless]] -- for the story.
* ''Drunk'' or ''Drunken'': Self-explanatory.
* ''Emo'': Synonym for "Angsty".
* ''Fem'': (Sometimes "Female".) A fairly rare tag, used to indicate that a character of uncertain or variable gender is female or predominantly so in the fic. Especially common in {{anime}} fanfiction. It's also used with a character (or a group of characters) of non-ambiguous gender, in which case it indicates a GenderFlip.
** For Ranma of ''[[RanmaOneHalf Ranma 1/2]]'', it usually indicates a story where he accepts and embraces his girl-side, often to the extent of abandoning being male altogether.
** In Literature/HarryPotter fanfiction, usually in stories written after the release of ''The Half-Blood Prince'', this is typically used to indicate a [[ViewerGenderConfusion female Blaise Zabini]].
** Multiple {{Unsettling Gender Reveal}}s happened to ''{{Gundam 00}}'' fandom when the beautiful Tieria was revealed to have a masculine voice. Even now, people call for 'female!Tieria' or the more explicit 'Tiera-with-girl-parts'.
** This happens frequently with the ambiguous character Haku from ''Manga/{{Naruto}}'', but this tag also gets used all the time on ''Naruto himself''. Partially ''Justified'' in the fact that Naruto has been seen changing into a female form as part of a Henge (or disguise), based on himself if he were a well endowed female instead of a guy.
** Seen in video game fanfics in which a main character's gender can be chosen by the player, such as ''VideoGame/KnightsOfTheOldRepublic'' (female![[spoiler:Revan]], female!Exile) and ''Franchise/MassEffect'' (female!Shepard) -- a corresponding "male" tag also exists.
** Seen in ''Series/StargateUniverse'' fanfiction where a female version of Eli has become quite popular. Well, Girl Eli.
** Fem! versions of the [[MoeAnthropomorphism nations]] in Manga/AxisPowersHetalia denotes that they have been [[GenderFlip gender bended]].
* ''Gay'': [[EveryoneIsGay Self-explanatory.]] Sometimes used if a character is portrayed as gay without being [[SlashFic involved in the main pairing.]]
* ''[=God=]'': A character is vastly more powerful, intelligent, and occasionally morally pure than in the source material. Similar to the below Uber tag, but more frequently used in negative criticism of a story than in the author's own description, with the frequent implication that the author incorrectly believes this version is {{canon}}.
* ''Not'': Frequently used to describe OriginalCharacters (or characters unfamiliar to the intended audience) that are (perceived as) blatant {{Exp|y}}ies, {{Captain Ersatz}}es, or otherwise have the SerialNumbersFiledOff from another franchise (for example, Not![[Anime/NeonGenesisEvangelion Misato]] to describe Haruka from ''Anime/{{RahXephon}}''). The tag might also be used to describe someone disguised as the tagged character.
* ''OOC'': OutOfCharacter. Generic warning that the character is likely to be nothing like you expect from watching the show/reading the book/seeing the movie.
** It can sometimes refer to everybody acting differently (sometimes with justified reasons, like mind control).
** Unfortunately some authors use this for "out of continuity", which causes some people to shun out-of-continuity fics unnecessarily.
* ''Past/Future'': In time-traveling stories, ''Past!'' and ''Future!'' may help with the WhichMe problem. More specific time periods may be used, for example, [[Film/BacktotheFuture 1955!Doc and 1985!Doc]].
* ''Psycho'': The character is insane, or acts like it. Specifically, he may behave like a psychopath or sociopath.
* ''Rational'': (Also ''Rationalist''). The character has a buff to common sense that would completely derail the canon of the series if it were brought into canon. Expect multiple characters to come along for the ride. Popularized (and possibly [[TropeMaker invented]]) by ''HarryPotterAndTheMethodsOfRationality''.
* ''Sue'': The character is evocative of a MarySue character of some kind, either by [[PossessionSue the derailment of the canon characters]]/inherent rules or by being overdosed with CommonMarySueTraits. ''Stu'' may also be used as for GaryStu. Sometimes this is reversed, as in Harry!Stu or Hermione!Sue.
* ''Uber'': (Sometimes ''Super''). The character is far more personally formidable than in canon, sometimes to the point of having actual super powers.
** Once again, Literature/HarryPotter, as authors explored the full range of possibilities for the "power the Dark Lord knows not" prior to the release of ''The Deathly Hallows''.
** Elevating Xander Harris from his nominal ButtMonkey status all the way to {{Superman}} and beyond is practically a cottage industry in ''Series/BuffyTheVampireSlayer'' fanfic.
** A subclass of this is the [=YAHF=], or ''Yet Another Halloween Fic'', from the fact that it uses the gimmick of the second season episode "Halloween" to achieve the Uber effect.

FanFic communities will often have tags specific to their fandoms that they use to describe tropes that occur with some regularity (Slytherin![[Literature/HarryPotter Harry]], Future![[Series/{{Heroes}} Hiro]], or Vamp![[Series/BuffyTheVampireSlayer Willow]], for example).

The title of a given FanFic 'verse, or an abbreviation thereof, can also be used to indicate the version of a character from that setting, particularly when there have been major changes to them: [[UndocumentedFeatures UF]]![[RevolutionaryGirlUtena Utena]], [[SailorMoonExpanded SME]]![[Franchise/SailorMoon Jadeite]].

Because this kind of tagging is ad hoc and in no way formalized, it's common to see unusual and/or idiosyncratic tags that indicate some truly wild variants, such as Cyborg![[Series/BuffyTheVampireSlayer Xander]] or [[Literature/TheChroniclesOfAmber Amberite]]![[Series/XenaWarriorPrincess Xena]].

The practice is starting to seep out from fanfiction, though, and can also be used when talking about similar things in the source material, such as, for example, Future!Hiro, Vamp!Willow, or Brainwashed!Undead!Starscream (''[[TransformersEnergon Energon]]''!Starscream for short). It's also used in a more tongue-in-cheek manner to categorize examples of the MarySue in a quick, concise form.

It can also be used to identify a specific version of a character or work when it had been done by different people and/or in different media since [[DependingOnTheWriter those can vary wildly from the source material]]. Sometimes this uses the name of the specific author or simply the form of the work ([[Manga/FullmetalAlchemist Manga!Pride, Anime!Greed]], [[{{ThePhantomOfTheOpera}} Leroux!Erik, or Movie!Phantom]])

These tags are also occasionally used when dealing with customizable characters in computer games. In addition, tags like this are used in spreadsheet programs to denote what sheet the cell in question is on if it's not on the same sheet as the cell you're typing in. [[http://www.catb.org/jargon/html/B/bang-path.html Bang paths]] were used in early e-mail to specify a UUCP route to a given user, and they're still part of the return path in {{Usenet}}.
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