The entire cast of the Broforce is thrown into the Khazan arena as a group. What is the strongest foe they could defeat?

Scenario 1) Strongest Single opponent (all vs one)

Scenario 2) Strongest Team opponent (any given established group from another medium, no mix-and-matching)

Stipulation a) The Broforce as seen in the game.

Stipulation b) The actual characters the Broforce are based on.