For anyone who's wondering, the six were:
-Luke Skywalker, an obvious one
-Emperor Palpatine, another obvious one
-Jorus C'boath, the third obvious one
-Grand Admiral Thrawn (Hand of Thrawn duo)
-Baron Fel (Hand of Thrawn duo)
-Bevel Lemelisk (sp?) - The tough one. He was cloned numerous times after failing Palpatine. Palpatine killed him gruesomely and then cloned him repeatedly.
OK, new question:
This dark skinned human of the Imperial Special Forces fought against Wedge Antilles and Winter on Ryloth. Who was he?