The Punisher (Marvel)

The Punisher is a violent vigilante from Marvel comics and varies from being a dark anti-hero to being an outright protagonist villain depending on the writer and/or story.

Driven by the death of his family, the Punisher hunts down criminals and kills them in brutal ways, and he is also known to settle for intimidation or torture. The Punisher is one of Marvel's more sociopathic anti-heroes and for this reason and can easily be seen as a villain by some, however in the end the Punisher does fight on the side of good: albeit he often utilizes tactics that would be undreamt of by more conventional (and ethical) superheroes.