To get Santa Claus on Lego Star Wars 2:The Original Trilogy you must type in the code CL4U5H to get his hat and suit, then type in TYH319 to get his glasses and beard.

Then go to the free-play player creator and find his suit and hat (use a green or red lightsaber to be more festive).

Next go to a level and select free-play mode and pick Santa.

When you get to the level go to your bonus contents and select disguise 3 and you have Santa!

Note: Santa is also very strong!