[quote=@Shard]
Since the power levels of various characters are like.., exponentially different, I am guessing the teamups will be somewhat tailored to that. Having a superman tiered character hanging around two demon hunters would be a bit weird, mechanically. Dunno, maybe it's just me. I can see how certain characters would create a very interesting dynamic together, though. 
[/quote]

Personally, Grim from the Justice League loves teaming up with street-level heroes to show how much better she is.