10. War Machine —
When Terrence Howard played Tony Stark's BFF in Iron Man, he hinted to a future possibility donning the War Machine armor. We all know what happened to him and Don Cheadle has successfully taken the reigns as James Rhodes. With Marvel beginning its Phase 2 initiative, it would be great for Jon Favreau to hop back into the director's chair and give War Machine a few side missions of his own. One possible idea can be taken from the storyline used in Iron Man 2 ("Demon in a Bottle") which finds Rhodes taking up the role of Iron Man as Tony recovers from his bout of alcoholism.