Ian McDiarmid
Emperor Palpatine belongs in the movie-villain Hall of Fame. Played to perfect by Ian McDiarmid, the character has had a lasting impact on Star Wars fans around the globe. McDiarmid reprised his role in The Phantom Menace and has otherwise been busy working on stage as a member of the Royal Shakespeare Company.
Kenny Baker
Kenny Baker scored the role of R2-D2 in the original trilogy and he got to reprise the role in the prequel series. Baker does the convention circuit but he otherwise has been relatively out of the spotlight, not appearing in a project in almost a decade. Moreover, Baker racked up 41 credits through his career thus far.