Certain Chao forms were made to represent characters, specifically Sega ones. Some are evolved from normal Chao, and were presumably designed to be similar to the character, while three others, the Tails, Knuckles, and Amy Chao, were made and distributed to be very similar to their respective character, and are unobtainable through traditional evolutionary and breeding means. Certain breeders also attempt to organize Chao to resemble other characters, outside of the specifically designed ones, but will not be listed here.