Taskmaster

Deadpool kills the Marvel universe
Taskmaster was hired to kill Deadpool by many relatives of the heroes Wilson killed when he went on a killing spree.

Taskmaster finally tracked him down to the swamp of the Man-Thing and engaged him in battle. During their battle, Taskmaster began to mimic Deadpool's moves and while doing so, even began to hear Deadpool's inner voice. He realized the truth, which frightened him and that fear caused the Man-Thing to incinerate him.