To activate these cheat codes, you need to start a new game, then enter "Decter's Dinner" and go into "Enter code".

BEQ82H - Princess Leia
L54YUK - Rebel Trooper
A32CAM - Darth Sidious
VR832U - Disquised Clone
MS952L - Mace Windu (Episode III)
RS6E25 - Clone (Episode III Walker)
N3T6P8 - Clone (Episode III Swamp)
BHU72T - Clone (Episode III Pilot)
ER33JN - Clone (Episode III)
SF321Y - General Grievous
ZTY392 - Grievous' Bodyguard
14PGMN - Count Dooku
EUW862 - Shaak Ti
CBR954 - Kit Fisto
DP55MV - Ki-Adi Hundi
A725X4 - Luminara
LA811Y - Bobba Fett
PL47NH - Jango Fett
XZNR21 - Super Battle Droid
LK42U6 - Battle Droid (Geonosis)
19D7NB - Geonosian
F8B4L6 - Clone
H35TUX - Darth Mual
92UJ7D - Padme
PP43JX - Royal Guard
DH382U - Droideka
EN11K5 - Battle Droid (Commander)
987UYR - Battle Droid
KF999A - Battle Droid (Security)
R840JU - PK Droid
U63B2A - Gonk Droid

The codes below needs activation in the "Extra" menu when you press [Esc] after you have entered them like the above cheat codes.

NR37W1 - Silly Blasters
L449HD - Classic Blasters
IG72X4 - Big Blasters
SHRUB1 - Brushes
PUCEAT - Tea Cups
LD116B - Minikit Detector
RP924W - Moustaches
YD77GC - Purple
MS999Q - Silhouettes
4PR28U - Invincible