As I have heard, a Justice League movie is in the works. Along with the seven founding members, I think a few more should be added in to the mix.
Henry Cavill as Superman
Christian Bale as Batman
Ryan Reynolds as Green Lantern
I want the audience to be as familiar with this movie as possible
Angelina Jolie as Wonder Woman
Her acting is not as good as it could be, but good enough for the Amazing Amazon.
Chris Pine as Flash
Not only has he done pretty well on screen, but he has the exact looks for Barry.
Alex Skarsgard as Aquaman
He's youngish. His acting is great.
Kevin Michael Richardson as Martian Manhunter
He has just the right voice. He may be a bit chunky, but they're probably doing CGI for Martian Manhunter.
Maggie Lawson as Black Canary
Her acting is just sham-wow.
Ewan McGregor as Green Arrow
Yes, I know everyone's suggesting this, but it is a good suggestion.
Brandon Molale as Captain Marvel
I've seen a picture of Brandon in a red shirt with a lighting bolt in it. After seeing that I though "Wow, that looks so much like Captain Marvel".
For this to happen, all of the above have to have individual movies except Martian Manhunter and maybe Black Canary.
I'm also doing a fancast for a Justice Society movie.