Taskmaster would be a better choice then Ajax. He plays better off of Deadpool. They're rivals, and plus Taskmaster has the mimic ability and photographic memory that makes him perfect foil. Taskmaster can copy characters like Spider-man, Captain America, etc. Colosuss doesn't seem to fit. Not unless they're using the story where Deadpool joined up with the X-men. Would be better if they used Cable and the New Mutants, as Deadpool debuted towards the end run of New Mutants before they became X-Force.