Used by followers of various media of entertainment, such as television shows, movies, books, etc. to note a particular belief which has not been used in the universe of whatever program or story they follow, but seems to make sense to that particular individual, and as such is adopted as a sort of "personal canon". Headcanon may be upgraded to canon if it is incorporated into the program or story's universe.
In my headcanon, John and Mary bicker like siblings when they're around each other... They just seem like they're brother and sister to me!
by the-deudliest-firearm July 13, 2012
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Used by many Hetalia fags to describe something that hasn't yet happened in original canon but has happened in their head.

i.e. Their own personal canon.
My headcanon says that Momma America was Native American actually
by shounenrobo April 8, 2010
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(also written as "head canon," but it's really one word.)

An idea, belief, or aspect of a story that is not mentioned in the media itself, but is accepted by either the media consumer themselves or the fandom in general. If it is confirmed by the creator of the story, it becomes canon.
In Homestuck , a popular webcomic , many suspect the headcanon that the trolls are carnivores, because of their natural homicidal tendencies and sharp teeth. It's never explicitly stated in the comic that this is true, but it'd be kind of dumb to assume they're a race known for salads and ice cream sundaes.
by TickTockTimeTraveler October 12, 2014
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Now... reality can be whatever I want...
person 1: omg i headcanon todoroki and dek-
person 2: please stfu
by ._.daydreaming April 11, 2022
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The non-canon personal ideas, opinions and believes that certain person or group of people feels strongly attached to, about a certain work of fiction (book, movie, cartoon, anime series, manga, comic book, etc...)

Sometimes people put their own headcanons above the actual canon of what was actually shown.
Person A: Android 17 is barely SSJ3 level, and that is exaggerating! Goku in SSJ Blue could have defeated 17 with a single punch!

Person B: That is your Headcanon. If he is a SSJ3 level character, then why Goku fought 17 with SSJ Blue instead of SSJ3, like he did with Trunks in a previous arck? Also, how can a SSJ3 level character resist attacks capable of hurting SSJ Blue evolution Vegeta and SSJ Blue kaioken x20 Goku that are 20 times more powerful than a SSJ Blue, 17 received a kick from Jiren, meant for Vegeta Blue Evolution in episode 127, and also took an explotion from Jiren that was able to knock out Goku and Vegeta, and he was still able to fight, a SSJ3 level character shouldn't be able to do that!
by TruthTellerX01 July 11, 2019
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Headcanons are traits, events and actions a fictional character is give to add more persona. Used by followers of various media of entertainment, such as television shows, movies, books, etc. Headcanons aren't specific .They are mostly add-ons to a profile of a character from someones belief, mainly never or possibly hinted by the creator.
Headcanon : Ichigo holds orihime with one of his arms while she lays on his chest as they sleep.
by Bluuu1999 November 1, 2015
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A HeadCanon is something that did not happen Canonically or Factually in an event(story, reality, etc.) but is something you would've liked to happen.
"I ship Name with Name. I think I would've liked if Event happened instead of Event."

"What? That's weird. Why do you think like that?"

"Oml, don't be a B¡tch. It's just a HeadCanon."
by Label_The_Candle August 22, 2021
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