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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)
rule 63 by InternetHateMachine September 8, 2007
Related Words
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.
Rule 63 by TheFallenWriter July 16, 2010
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
Rule 63 by SpaghettiSucker39 July 7, 2021
A porn thing where you change the gender of a character
I need some good porn.

Have you tried Rule 63?
Rule 63 by Apex Kermit October 7, 2021

CEO of Rule 63 

A nigga who shitposts and copy-pastes memes. Will fucking rule 63 u or even futa while you are in-active in Discord.
"Oh shit its the CEO of Rule 63! RUN!!!"
CEO of Rule 63 by CEO of Rule 63 August 12, 2019

rule 6383 

in which you swich genders every 83 seconds
bro 1: why can't u stop switching genders every 83 seconds
bro 2: BECAUSE OF THE RULE 6383
rule 6383 by vicxkellin July 19, 2018