7. Jimmy Olsen - Seth Green
Again, it's likely that the casting of Olsen will be announced before the Justice League movie comes to fruition, since Clark Kent is now working as a journalist in Batman Vs Superman, and will presumably meet some of his traditional work mates, but that doesn't discount the relevance of casting him. If being red-headed was the only qualification needed to play Olsen - as some fan communiities seem to be suggesting - then Rupert Grint would probably also spring to mind. But since he spent the majority of the Harry Potter franchise contorting his face horribly in the sometimes vain attempt to convey real human emotion, it's unlikely he'd be entrusted with a character who could potentially be as annoying as Ron Weasley was. Seth Green would be a far more appropriate casting, not least because of his physical attributes, but also because of his geek credentials and the persona he is most typically known for.