Which Squad member would you like to see added? I think there is room for one more on the roster especially since some of them have a very unique power set!
My pick would be El Diablo hands down! He's very unique because he can teleport, shoot fire, carry fiery chains and is essentially a spirit of vengeance. I think he'd be a cool addition and quite similar to Scorpion in gameplay which is a plus in my eyes. Plus his super could involve him turning into an Aztec fire god, like he did in the movie. My other pick would be Enchantress simply because she's a powerful sorceress (in the movie she was a Meso-American god) and looks cool.