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!