Violator

The Violator is a primary villain in Image Comics' Spawn series. He is a demon under the service of Malebolgia. He is also one of the Phlebiac Brothers. His true form is that of a demon, but he prefers the appearence of a clown.

Movie
In the live action movie, Violator works together with Jason Wynn to have Wynn's best assassin, Al Simmons killed.

HBO Series
Like in the comics, Violator is a dominant antagonist in the first season.