4. Gary Oldman
Gary Oldman is one of the most acclaimed actors in the world and despite already starring in two of the biggest and most recognizable franchises in recent history with Harry Potter and Batman, he would be a great addition to the Star Wars universe. He has played an iconic villain in Leon, a father figure in Harry Potter and something in between in a masterful performance in Tinker Tailor Soldier Spy. His versatility as an actor is such that I don't even have a recommendation for a role as he'd be equally good almost anywhere, although I would probably most like to see him return to his more villainous roles.