MM. His powers are so different from the rest of the league and it would give so much more variety.

Cyborg and GA would be boring when the rest of the team is practically god like.

Shazam would be too much like Superman

Hawkgirl would be hit or miss.

It's not that I don't like these characters, I just can't see the developers (whoever they are) doing justice to them justice

Sure, I'll play along. Make mine J'onn. Nothing against the others, but his powers at least bring genuinely different things to the table without requiring suspension of disbelief (any more than that which is already necessary to justify Batman's presence, that is).

Actually, do something completely different and have Batman just be in charge of communication between the team, much like Cyborg did in JL: Earth's Final Defense. It'd never be approved by a board of directors, but hey...

A green arrow video game would be awesome but gotta stick with mmh

@self-dceit: I personally feel Cyborg would be the best choice given his technology and how that plays into the team. His gameplay would be more unique to him and less similar to the other Leaguers than MM in my opinion. J'onn would feel a bit like Superman having super strength, flight, invulnerability, martian vision, martian breathe. There are some things that would make him different with intangibility, telepathic attacks, etc. I also like he is a voice of wisdom, but again, I feel Cyborg would be the better choice to have differentiating gameplay between the Leaguers while also being interesting for the story. I think MM is also very interesting, it's a tough choice.

Green Arrow. A lot of people don't mention it, but he's got some pretty sweet gear which would obviously set him apart from Batman, who'd most likely be a physical, close range fighter with few long to mid range options.

Depending on the type of game, Arrow offers a lot of versatility. He can do hand-to-hand, long to mid-range, stealth, crowd control, escape, etc.

J'onn hasn't had martian breath in a very long time, he's not as strong, he's not invulnerable and his martian vision works differently than Superman's. But I see what you mean about Cyborg bringing more different stuff to the table.

@self-dceit: Yeah, it used to be all he could do. I know he isn't as strong or invulnerable in a certain sense and his vision is more like force IIRC and not heat. They both have things that would be interesting, but I'd go with Cyborg due to diversity, and what his character/gameplay brings to the table.