SUPERMAN:Mark Valley
I wanted to try another actor for superman rather than the usual ones that are mentioned on here. I looked at Mark Valley and thought he had the look and build for a middle aged superman which is what they are going for now. He would just have to dye his hair darker.
BATMAN:Jeremy Sisto
For continuity sake I am going to keep with my original choice for batman and go with Jeremy Sisto. This justice league movie would be like the animated series you would seldom see batman without his cowl off so you would just need his voice. Sisto is a great actor.
WONDER WOMAN:Cobie Smulders
Cobie is not only a beautiful woman but a very diverse actress and would bring diana to life and be able to stand next to superman and batman creating the trinity.
THE FLASH:Neil Patrick Harris
Neil is my favorite choice for the flash I know some people don't like him but I think he would be awesome as Barry Allen; he was amazing as the animated version I think he deserves a shot in live-action as well.
GREEN LANTERN:Ryan Reynolds
Ryan has already been cast and from the trailer looks decent. I think he is going to go from a comedic Hal Jordan to a transformed/mature green lantern.
MARTIAN-MAN-HUNTER:Dennis Haysbert
Haysbert has the deep voice that I see manhunter having and would also be a good Jon J'onzz.
AQUAMAN:Armie Hammer
Armie Hammer has the height & look to be the king of the ocean.
THE VILLAIN...
DARKSEID:Michael Clarke Duncan
Michael is a fan favorite for the role and mine too he would need either a mo-cap suit or prosthetics and would be an intimidating presence as darkseid on screen.