When the first Sonic the Hedgehog game was localized to western markets, Sega of America renamed almost all of the animals and give them different backstories, which are explained in the Sonic Bible documents, and the guidebook Stay Sonic. In many games, advertisements, and instruction manuals have revealed the names of the rest of the animals to be Ricky (squirrel), Pocky (rabbit), Rocky (seal ), Pecky (penguin), Cucky (chicken) and Picky (pig). From the first Sonic game onward, Flicky became a recurring minor character in the series and Naoto Ohshima redesigned her to fit in with the other animals.
However, Flicky is the exception, who starred in her own eponymous arcade game released in 1984, and was designed by Yoshiki Kawasaki. Animals are presumably created by Naoto Ohshima, the character designer of the original Sonic the Hedgehog.