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 appearance of a clown.

Comic Book
The Violator is one of Spawn's most recurring and vicious opponents, being a mentor of sorts to the Hell-Spawn he is a arrogant and cruel entity that delights in the pain of others, while naturally a gigantic monster he often took the disguise of an obese clown when interacting with the mortal realm, hence earned his alter ego of the "Clown".

Violator sees murder, torture and depravity as forms of entertainment and holds humanity in contempt, feeling true demons like himself are superior beings, this in part fuels his particularly brutal interactions with Spawn: who he is sworn to serve but still holds in extreme contempt for being a former human.

Movie
In the live action movie, Violator works together with Jason Wynn to have Wynn's best assassin, Al Simmons killed. he was portrayed by John Leguizamo.

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

Todd McFarlane's: Spawn for Super Nintendo
Violator appears early in game and started a Prison Break to get to Billy Kincaid. Violator appears in the game as the clown, but immediately changes into Demon Form for the fight.. After Violator retreats, Billy is "used" to access a portal to Hell.

Spawn: Armageddon
Violator appears as one of the main antagonists in the video game Spawn: Armageddon and faces Spawn as a boss battle, like all of his previous appearances he is sadistic and cruel with a mocking and arrogant personality and formidable demonic powers at his disposal.