6. Warwick Davis
Why Warwick Davis? Warwick Davis didn't really get a chance to flex his dramatic muscles as Wicket the Ewok in Return Of The Jedi (which kind of makes sense given that his character didn't speak English and that he was eleven years old at the time), but in the past thirty years he has become pretty much the go-to actor for vertically challenged characters. He's notched up a huge number of diverse roles over the course of his career including a murderous Leprechaun in a series of 90s horror films, warrior mouse Reepicheep in The Chronicles Of Narnia, and Charms teacher Professor Flitwick in the Harry Potter films. His talents have really developed over the course of a long career and he's capable of portraying a large range of emotions and characters. So it only seems right that he should return to the series that started his career.
Who Could He Play? Any kind of alien or short human character would suit Davis thanks to him having a lot of versatility as an actor. It would be interesting to see him take on a more villainous role though.