Rocket Raccoon and Han Solo
The young Han Solo has been cast for the film to feature the early years of the Star Wars'  hero.  I am not familiar with the work of Alden Ehrenreich, but he sure has his work cut out for him.  As cool as seeing a movie about Han and Chewie in their smuggling prime may sound, comparison to Harrison Ford's iconic performance will be unavoidable, and it will take some doing for the new guy to make the role his own.