This category refers to morally-dubious characters whose main enemies are themselves villains. Obviously, the story needs to have more than one villain (or even a multi-being or dissociative villain with two evil counterparts) for this to be possible. Many extremely dark works, such as Warhammer 40,000, base their main conflicts around this principle, and nearly all Protagonists are portrayed mainly fighting individuals who are either similar to or clearly even worse than they are. However, not every villain who has ever fought another villain should go here. Villains only belong if this applies to most or all of their activities and is a significant aspect of their character and if they are seen as "Heroes" in their setting due to the extreme levels of wickedness committed by their enemies. Some of these villains are also known as "Enemy of a Villain".