I am toying with the idea of keeping Watto and perhaps Zam Wessel (not as a shape-shifter). They stood out as feeling Star Warsy to me.
I understand why people would want to keep Maul and Qui Gon, I think in large part because they had two of the best performers in the films. I have no use for Maul. Such an obviously evil and "cool" character is destined to be superficial. Qui Gon was the only Jedi who seemed to have any sense. I would allow Obi Wan to have Qui Gon's favored characteristics.
Watto and Zam are probably the only elements I would keep mostly intact. What are all your feelings on those two?