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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 12, 2012
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May 18 Word of the Day
When you think up something brilliantly righteous while baked.
X: I had this great highdea last night
Y: You clearly were philosopher stoned.
by TripleWest September 03, 2012
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An idea or opinion about a fictional series (Book, TV, Comic, or otherwise) that is true in one's head, but has not become a canon fact.
In my head canon, Jade and Dave from Homestuck are totally in love with each other.
by Nellaxival August 03, 2011
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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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An interpretation of a piece of media that is not shown or confirmed in the original but is believed to be true simply for preference.
May also include direct deviations from the canon.
In a perfect world, instead of Philip, Grog would have recited Percy's full name perfectly as his 'fancy name' and, after a moment of stunned silence, Percy would have added, 'You can just call him Percy.'"

...This is my new head canon.
by Haomakk April 07, 2021
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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 10, 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 October 31, 2015
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