Rule 63

Rule 63 is an Internet meme that states that, as a rule, "for every character there is a gender swapped version of that character". It is one of the "Rules of the Internet" that began in 2006 as a Netiquette guide on 4chan and were eventually expanded upon by including deliberately mocking rules, of which Rule 63 is an example. It began to see general use in fandom communities as a term to refer to both fan-made and official gender flips of existing fictional characters.