4. Flash In, Martian Manhunter Out
If Justice League War is anything to go by The Flash will definitely be a member of the League and will be a stoic, honourable type of character. He will be a big fan of Gotham's own crime fighter, the Batman, and an admirer of his work. Gone is the wise-cracking, brash and immature Barry Allen people may have seen before and in comes a more mature, moral hero, not dissimilar to Captain America's character in the Avengers. Unfortunately, in trying to find to the right balance of characters and personalities for the Justice League, we probably won't be seeing the Martian Manhunter any time soon. The last surviving alien of an extinct race who can fly and has super strength (amongst other abilities) is just too similar to that of Superman so, for now at least, the Manhunter will not be part of this Justice League. This League will focus on six characters who are Superman, Batman, Wonder Woman, Green Lantern, Cyborg and The Flash. Any more than six and the film would be in real danger of stretching itself a little too thin.