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"Oh, no — another fan with ideas..."
Avatar the Last Airbender

Mab: There, there... I guess Shonen-ai in Furfire was just not meant to be, Zina.
Silver: You know, I could've told you that much...
Zina: Pfft! Silly Silver! You're just the creator! What do you know?
Furfire fanart

Ultimately, Canon is much smaller than the people who throw the term around like to think it is. Canon is limited to that which has actually been described in the source material. Especially in groups of writers, it boils down to what the writers specifically need to worry about for the purposes of the ongoing plot.

Fanon is the set of theories based on that material which, while they generally seem to be the "obvious" or "only" interpretation of canonical fact, are not actually part of the canon. Occasionally, the explanation seems good enough to just be "common sense." The salient point to remember is that when someone shouts, "That episode was terrible because it violates canon!", they are very often totally incorrect.

Fanon fills in holes that the writers may have deliberately left in order to have fodder for later stories. In addition to arising from a point of vagueness in the canon, Fanon can come into existence as a fact gained from a popular but non-canonical source, or taken from a different Adaptation. Because many fans mistake their own Fanon for actual Canon, they tend to get riled up when a new fact is introduced which does not literally contradict anything canonical, but invalidates what were formerly the most obvious assumptions. Many examples of Ret Con and Continuity Drift that are imagined to be violations of Canon really only explicitly contradict Fanon.

Popular subjects of Fanon include character backstories, full names of characters with No Name Given, what characters actually do for a living, and Shipping — a whole other world of its own.

Since many creators in the aftermarket series universe are fans, Fanon often shows up there, and if those creators in turn start writing for the actual show, Fanon may actually become Canon. Alternatively, you just have Memetic Mutation within the fandom.

Fanon often also refers to the body of information provided by otherwise-official sources. Television and movie scripts are a continuing source of fanon material — Star Trek's Captain Kirk, for example, had a middle initial ('T.') but his actual middle name ("Tiberius") was considered "fanon" until it was revealed canonically in the sixth Star Trek movie (it was first heard on screen in an episode of the Trek animated series, but that series' canonicity is debatable). Note that this usage blurs the line between fanon and deuterocanon, though.

Warning: Fanon and accusations of Fanon are a classic Internet Backdraft, with the accusation commonly leveled by fans that have a different interpretation of the material — even when their theory is just as vulnerable to Schrodingers Gun.

Compare Broad Strokes, where the events of a story is referenced in passing but doesn't take everything said and done as having "officially" happened. See also Fandom Specific Plot.

But just between you and me...


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