Basically withered Shadow Bonnie is a weird glitch basically a long while ago someone out there downloaded a corrupted save file of Five Nights at Freddy's world depression played it for a little while and eventually unlocked withered Bonnie and Shadow Bonnie one day however they left their computer open and since I'd say file was corrupted it had free will to do whatever it wants so it started corrupting the entire game turning into a twisted version of itself the corrupted save file tried to fuse multiple animatronics together but each time it failed becoming a mess of code until it fused withered Bonnie and Shadow Bonnie together and created withered Shadow Bonnie but it thought that it failed as well so it's fat withered Shadow Bonnie out and kept on trying to create the ultimate animatronic Fusion and the rest is history after a little while of exploring with a shadow Bonnie eventually met his friends AKA keylee fb and roser
