Do you know about Resident Evil Mercenaries Mode? It’s basically like Halo’s firefight, kill enemies and take rounds, but you can choose differents characters.
It would be exactly like Firefigh mode, but with the possibility to select differents characters like:
And who knows? Maybe Noble 6 just for play as him! (I know he’s dead)
Each character of course would have differents abilities and weapons
Would you like it?