Tough call. I bounce between them and enjoy them all for different reasons. Han is great for a quick path to two of the planet multiballs. R2 for multiplier fun. Luke has a couple super awesome unique modes. Leia...well I'm not sure her advantage off the top of my head, but I did beat the Emperor with her the other night. I also love how the callouts, ball save videos, etc change depending on your choice. Just awesome programming. Dwight is by far my favorite programmer. GoT is my all time favorite code, but SW is pretty close behind. Can't wait to get my hands on a TMNT and it seems cut from the same cloth!

While Chewie would be a cool addition, I think it would have been difficult to make him unique from Han since they were almost always together. Part of the fun of the different characters in the game is that their required modes relate to scenes which they were in in the movies. Not sure how you'd separate Han and Chewie.