#3. Robert Downey Jr. as Tony Stark
A particular fan-favourite, Robert Downey saw his struggling career revitalised following his casting as the genius billionaire playboy philanthropist. Despite a slight dip in quality in the heavily-criticised Iron Man 2, Tony Stark’s four cinematic outings have seen him develop well as a character, with Downey clearly enjoying material that has allowed him to play to his strengths. There are question marks over his future in the role, especially after the closure of Iron Man 3, but I’m guessing Age of Ultron will have a lot to say on where Downey’s future in the role will lead.