Play as secret characters in the demo version - First of all, complete
the demo, which will unlock the "Free Play" mode. Then, enter that mode
and you'll be able to create 2 characters. Continue playing and you'll
see only the two of them in the map. Press the key to switch characters,
and depending on the area you're currently in, different characters will
appear. You can not only play with most characters from the demo, but
also with the Emperor, from Episode VI.
End of Demo Code - Upon beating the demo and getting all 10 canisters
you receive a code for use in the normal game. Also listed in the pause
menu once you unlock the three unlockable characters are codes that
correspond to each, presumably for unlocking them in the normal game.
Characters -
Enter the password on the password entry screen.
UCK868 - Beach Trooper BEN917 - Ben Kenobi (Ghost)
VHY832 - Bespin Guard WTY721 - Bib Fortuna HLP221 - Boba Fett
BNC332 - Death Star Trooper TTT289 - Ewok YZF999 - Gamorrean Guard
NFX582 - Gonk Droid SMG219 - Grand Moff Tarkin NAH118 - Greedo
YWM840 - Han Solo (Hood) NXL973 - IG-88 MMM111 - Imperial Guard
BBV889 - Imperial Officer VAP664 - Imperial Shuttle Pilot
CVT125 - Imperial Spy JAW499 - Jawa UUB319 - Lobot SGE549 - Palace Guard
CYG336 - Rebel Pilot EKU849 - Rebel Trooper (Hoth) YDV451 - Sandtrooper
GBU888 - Skiff Guard NYU989 - Snowtrooper PTR345 - Stormtrooper
HHY382 - The Emperor HDY739 - Tie Fighter NNZ316 - Tie Fighter Pilot
QYA828 - Tie Interceptor PEJ821 - Tusken Raider UGN694 - Ugnaught