The concept often referred to as Rule 64 describes the gender-swapping of characters. It posits that if a character exists, there is an existing or potential version of that character of the opposite gender. This idea manifests frequently in fan art, fan fiction, and cosplay, wherein familiar figures are re-imagined with altered sex characteristics.
The proliferation of gender-swapped character representations demonstrates a fascination with exploring alternative interpretations of established narratives and character dynamics. This phenomenon allows creators and consumers to engage with familiar intellectual property in novel ways, fostering creativity and reimagining traditional tropes. Its prevalence underscores the enduring human interest in exploring variations and possibilities within fictional worlds.