I thought this was a cool idea,and if someone already mentioned this or someone has already made it sorry.
This is what the mutator should be like:
Name: Human Tank
purpose: So basicaly what this mutator would do is make the players human tanks! You get to spawn with 199 health and you spawn with a shield belt, chest armor, leg armor, a helmet, unlimited amo,recharging health, and jump boots with unlimited jumps. You would also have the berserk and juggurnaut power-ups for an unlimited amount of time, and would be in speed freak mode.
This could also be a game mode where somone starts out a the human tank and whoever kils him gets to become him(Pretty much a juggurnaut match)
I have no idea how to make a mutator so i was hoping that someone could make this. I have a PS3 so i know i may have to wait a while.