I would have to say grunt... they are just to funny, and what jerk would hurt them...
Any jerk who would like to complete the Campaign in one piece.
As for me, I think I would be an Elite. They may not be an enemy anymore, but they sure were, and they are quite badass.
I wouldn't be an Elite in the Multiplayer, damned Dinos **** me off.
flood a single spore could take out a civilization
Unless Master Chief steps on it.