All Characters & FMV::
Make a new profile in Gameshow mode and name it DOUBLEDOUBLE.

All Weapons & FMV:
Make a new profile in Gameshow mode and name it TIMEFORCHAOS.

All Arenas, Weapons, Weapon Sets & FMV:
Make a new profile in Gameshow mode and name it AROUNDDAWORLD.

Food characters:
Make a new profile in Gameshow mode and name it FOODFIGHT. Then go to Battle mode and choose any character except Lucky Lucy or Lance. Press the white button and they will become a food product.

Uber mode:
Make a new profile in Gameshow mode and name it UBERHUNGARIAN. Then go to Battle mode and select Combat mode. Go to the star collection screen, highlight 200 stars and press the white button. Iit will say UBER. You will have to get 400 stars to win in this mode.

Thanks to Revolution readers Marc Bashir!