Mass murderer

In one of the series titled, "Deadpool kills the Marvel Universe", he actually kills everybody. He is one of the most dangerous anti-heroes that Marvel has ever created. In this four-part series, Deadpool is subject to a lopsided experiment and starts killing all the superheroes, villains and everyone in the Marvel Universe. He used different weaponry to assassinate everybody. Even the Avengers posed a victim to his stints. The most thrilling part of the series was when he pointed out to the readers and whispered, "I will find you soon enough".