Suggestions by @bubbazdean
6 suggestions

Ian McDiarmid
as The Emperor in Star Wars: Rebels
+7-2Score: +5

Pierce Brosnan
as Grand Admiral Thrawn in Star Wars: Rebels
+3-8Score: -5
Richard E. Grant
as Grand Admiral Thrawn in Star Wars: Rebels
+3-8Score: -5

Keanu Reeves
as Darth Revan in Star Wars characters without a live-action appearance (Legends and Canon)
+8-1Score: +7

Keanu Pires
as Darth Revan in Star Wars characters without a live-action appearance (Legends and Canon)
+1-1Score: 0

Russo Brothers
as Director in Star Wars
+10-6Score: +4