There is no real consensus.

It's seems to be 

1-2 - Wing/Animal

2-2 Me/Trinity

3-2 Animal/Unlucky.

I'd personally prefer 2 or 3 but that would alienate you a bit Nightwing since you prefer hero characters in the case of 3. Personally the is a reason I would be interested in villains. It's not often done and it'd be very fun to play the super villains as the protagonists with the heroes being our pseudo antagonists. But the end game would be very weird it'd have to be whatever we can cobble together. Hell we may even end up in jail. It also brings along the question of how would we start off? One big event that blows up out of proportion that leads to us teaming up? The big bad recruiting us all for the big scheme? Do we just team up for practical purposes? That would need to be solved before we head into a villains scenario. Heroes would be simple enough. Be in the city, do hero stuff. Academy would probably just start off with us on our first day of school or the day before school when some event happens and we meet each other before the stuff goes on at school.