The bottom line here is... these guys know their comics like the back of their hand and they are quite committed to community feedback and ideas. Dinozords, who runs a weekly Friday night stream show starting at 7PM EST, has uploaded and posted a few videos in which really reach out to the illiterate DC Universe fan in all of us. If you do not know the comics and these character's general backstories and so on... you will learn a lot about the DC world in minutes.
In one of Dinozord's videos, the "Stage ideas" it really opens the roof when thinking what all stages and what all combo and damage possibilities are at hand here. You will need to just check out this video to understand. I assure you... these guys won't waste your time and they know their stuff.
UPDATE: In the "Developer Diary Breakdown" Dinozords showcasing hints at Mr. Freeze and Poison Ivy*
Dinozords: Stage Ideas, Developer Diary Breakdown Hints at Mr Freeze and Poison Ivy - Join In!