Billy Hatcher is a character in the Gamecube game "Billy Hatcher and the Giant Egg". He is referenced in the .petition file found in C:\Users\USER\LOCATION\SDCWin32\Extra Data Files\Documentation\Printouts.
The text found inside the file is below;
Please bring back billy (hatcher) who has been gone for over a decade and a half. Nows the time to bring back the hatch man. Don't lay another egg on this one sega.