Every one says that you can't get darth vader but I can tell you now you can and it is pretty hard
First you have to go on every level and get as many studs as you can find and the bar at the top will flash when it does that means that you have succesfully got the special mini kit thing for that level do it for every level and it will turn otu to be the rebel blocade runner (tantive iv) when you do that I think it will say that you have unlocked darth vader but then you have to buy and think he is 100,000 studs
Hope I help I know it's allot but lord vader is cool cos when you put his saber away you can here him breating.
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