I have found out some info
On the character menu there is no space for a another character
like this it goes
N Tropy......-----....-----.....-----.....Pinstripe......----- Normal
Ripper Roo...-----....-----.....-----.....Papu Papu
.............K. Joe.....Penta......Fake Crash
So if you could get oxide where would it go?
Well another peice of info to say you cant get Oxide
Found out today at 11:30 am GMT by FireDragons
Stumbed across this old site xD