I think the obvious answer is five. Superman, Batman, Wonder Woman, Green Lantern, and Flash. You need those five. Then I think maybe an unexpected sixth would be cool; for examole I like to list Joseph Gordon-Levitt as Nightwing in my fancast for Justice League. I also like the idea of another non powered being in the group. Nightwing could be the young, not to ecpierenced member of the group that Batman brings on board late in the game when he thinks they'll need all the help they can get. Also for some reason I like sea heroes like Aquaman and Namor and if done right I think could be quite epic so I like to include Liam McIntyre as Aquaman in my fancasting as well. So my opinion, most likely will be the big five; could add an unexpected like Nightwing and make it six. Could add an important member like Aquaman or Martian Manhunter(who I hooe is not in the film cause I just don't like him) and make it 6/7. But thinking logically it'll just be the big five cause their the most well know and the less characters to deal with when most havent been introduced already the easier it will be to handle as a writer/director.
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