Villager did not originate from fanon, and the information on this page may not be entirely accurate to their canon. You may read more about this subject in the context of their canon on the following wiki(s):
Villagers are humanoid characters that act as the customizable avatar characters of the Animal Crossing series. While their shirts have been customizable through every iteration of the Animal Crossing series, other games have added in additional options such as hairstyles, shorts, shoes, and skin tones.
Villagers have appeared outside the Animal Crossing series, with prominent appearances in Mario Kart 8 and Super Smash Bros. for Nintendo 3DS and Wii U. While Villagers outside of the Animal Crossing titles are generally not customizable, they often take the appearances of generic villagers used in Animal Crossing promotional material.