(Internet slang, fandom slang, informal) The proposition that it is possible to find genderswapped versions of every fictional character, especially as fan arts on the internet.
This kid likes Rule 63
by Oofbaby June 02, 2018
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Rule 63 is an internet rule that means "For any given male character, there is a female version of that character." This also apply to female characters turning into males. Unlike Rule 34, there are two exceptions to this rule. A: the male character is already so androgynous that a female version would be basically the same, or B: the female version hasn't been drawn yet.
Man: Chun-li is so sexy right about now.
Woman: Bah, here's a Rule 63 Chun-Li without boobs and now with a penis.
Man: Ok that's wrong...Now let me show you Dante with a Vagina and Brest.
by TheFallenWriter July 16, 2010
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Rule 63 is an Internet meme that states that, as a rule, "for every given male character, there is a female version of that character" and vice versa. ... It began to see general use in fandom communities as a term to refer to both fan-made and official gender-swaps of existing fictional characters, so if it's a famous dude, there is a female version
John: Hey have you seen spidergirl?
Me: Yea, its Rule 63, it's a gender swap, real or fake, it;s a female
John: Whats Rule 63?
Me: look it up on the urban dictionary
by SpaghettiSucker39 July 07, 2021
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Rule 63 is a rule of the internet that reads as follows: "For any given male character, there is a female version of that character." This rule's exceptions are only in the instance that A: the male character is already so androgynous that a female version would be basically the same, or B: the female version hasn't been drawn yet.
Nintendu: Rule 63 dont apply to evrythin!
Me: Fine. Name one male character who you think couldn't be made female.
Nintendu: zOMG, Link is so smexy! He's da manliest man evar!
Me: Boo! Here is a picture of Link with tits and a vagina! Muahaha!
Nintendu: (sobs)
by InternetHateMachine August 08, 2007
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A porn thing where you change the gender of a character
I need some good porn.

Have you tried Rule 63?
by Apex Kermit October 07, 2021
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