A headcanon can be seen as two things:
As a canonical fact in the game / anime / show that is either mentioned or not mentioned in it . But, it also can be a non canon fact that, basing it off other canonical facts in the game / anime / show, could make sense as canon.
Did you know that there is a danganronpa headcanon that says that there is a website based off canon stories happened in danganronpa 2? In the game, ghundam mentions it once!!

I think that teruteru could be headcanoned as bisexual ! He likes girls for sure, but in the game he shows some hint abput he may be interresed in guys too !
by Emo.hello.kitty August 12, 2021
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Something that has been thought up by fans of a certain type of media to either allow themselves to relate to a character or simply just for fun.
"I Headcanon Tony Stark as bisexual."

"People who get annoyed at headcanons are dumb."
by arddulliau October 26, 2022
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Something that was supposed to be fun and light but is tainted with weird Gen z that need to make everything about sexuality and gender
Weird Gen z: My headcanon is that this character from this story is an aro/ace-homosexual nonbinary
Others: oh.. I don't really care about that. I just wanna watch the show
Weird Gen z: oh so you're a arophobic, homophobic and transphobic
by robynngaeblack October 18, 2021
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Definitely in no way related to Hetalia, it refers to what a character from the webcomic Homestuck sounds like in their heads
Oh gog Octopimp's voices have so much headcanon in them
by AeromanDVance November 25, 2011
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An extreme act of oral sex on a penis.
She said she was good at blow jobs, but that girl straight up headcanon-ed me.
by jk_unicorn May 7, 2019
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When someone posts their own view or belief of something they think happened in a piece of fiction as a fact or truth when it hasn't been stated or addressed as such by the work itself or the creators of said fiction. Usually used to try to fix plotholes in a story.
Bill: This water has healing properties because in Book 3 , they gave some to Saragal and it healed her.

James: It does? But the book never says anything about that spring having healing powers and the characters who drank from it before never had their injuries healed.

Bill: Well it makes sense, so its true!

James: Bill, you can't just use your own headcanon solution as a way to explain something that has no evidence for.
by JazzRobot August 11, 2017
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A headcanon that dictates a canon event to be a non-canon one.
I'll do a reverse headcanon and pretend that doesn't exist.
by deepintheass August 10, 2023
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