So we have Cyborg...
Aquaman might be hard as he's under water, consequently may not have enough to do with the surface.
I think there should at least be 7, no less than 7 members. This isn't The Avengers.
Superman, Batman, Wonder Woman, Flash, and Green Lantern (but which one?) are the most important.
Flash has to be full of jokes. John Stewert was very straight but a little too boring, but I think he and Wally West set the balance. Hawkgirl was boring sometimes, but I liked her.
She was the toughest of the league. I think they must have more than just one woman. I can't stand that they only have one. So I would strongly recommend Hawkgirl.
Problem is, you have too many members in the League that can fly, except for Batman and Flash.
And you add Martian Manhunter...he's powerful, but he flies just like the rest.
You got to have someone who isn't white also. Justice League for the longest time had only white people. So adding in Cyborg was a good choice. You need to add at least one more woman other than Wonder Woman.
This way Wonder Woman could have another companion.
I loved Martian Manhunter. What was interesting, as powerful as he is, was how peaceful and Gandhi-like he was, and not that interested in humanity.
Cyborg can't fly as far as I know, and that's good, because you don't want to have everyone fly.
Problem with the Justice League in general, in comparison with the Avengers, their group is interesting because it is full of different heroes, not all similar, except they only similarities several of them share are super-strength.
In The Avengers, everyone comes from a different background. Most of them do not wear logos on their chest except Captain America, and the "A" on his mask. Each of them have different skills and powers whereas in Justice League, except for Batman, they can all do the same things. Cyborg, however will be able to do different things.
Martian Manhunter may be good because he can read minds for other members. Batman uses weapons. Superman, we know what he does. Only thing is Wonder Woman, Green Lantern, and Martian Manhunter all fly like Superman. Martian Manhunter does everything Superman does, not to mention, from another planet.
Green Lantern has a magic ring, so that might help, but he flies as well. Wonder Woman uses her rope...but she can fly too. If they add Hawkgirl, that means they will have another flier.