Evil Vs. Evil

Villains whose main enemies are also villains themselves. 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 or villain's hater".

Good examples of this include Joseph Stalin vs. Adolf Hitler, Vegeta vs. Frieza, Slade vs. Trigon, Freddy Krueger vs. Jason Voorhees, Mr. Krabs vs. Plankton (more specifically after the first movie), Kratos vs. Zeus, Alastor vs. Vox, Megatron vs. Starscream, Fliqpy vs. Tiger General, Tom Cat vs. Jerry Mouse, Ryuga vs. Rago, Spectra Phantom vs. King Zenoheld, General Shepherd vs. Makarov, Wario vs. Bowser, Kazuya Mishima vs. Heihachi Mishima, Xenomorphs vs.Predators, Tony Soprano vs. Phil Leotardo, Trevor Philips vs. Devin Weston, Skeletor vs. Hordak, Megamind vs. Tighten, Rick Sanchez vs. Rick Prime, Risky Boots vs. Pirate Master, Harley Quinn vs. Joker, Dan vs. Travis Touchdown, The Beast vs. Gaston LeGume, Kash D. Langford vs. Daniel Kon, Team Aqua vs. Team Magma, Mal vs. Uma, Walter White vs. Gus Fring, Prince Olympius vs. Diabolico, Gumball Watterson vs. Rob, Donkey Kong vs. King K. Rool, Tomura Shigaraki vs. Re-Destro, Sport vs. Travis Bickle, and Michael Corleone vs. Vito Corleone, Emilio Barzini, Philip Tattaglia, Carmine Cuneo, and Victor Stracci. Void 4 is an example, since he is a noble demon bent on destroying Black Hole and tyrants. Maleficient, Queen Ingrith, and King Stefan fit this trope for most of Maleficent (and its sequel), as all three are villains who are fighting against each other. Alejandro and Heather from the Total Drama franchise also fall under this category, as they both have a rivalry during their time in the competition. For the third season of 13 Reasons Why, Bryce Walker, Monty de la Cruz, Zach Dempsey, Marcus Cole, Clay Jensen, Justin Foley, and the rest of The Bakers Dozen are all examples of this.

Even villainous protagonists can qualify if they are (or occasionally) rivals with another villain. Good Examples: Peter Griffin vs. Carter Pewterschidmt, Felonious Gru vs. Vector Perkins, Darth Vader vs. Emperor Palpatine, Ryuga vs. Rago, Megamind vs. Tighten, Jim Carrey Grinch vs. Mayor Augustus Maywho, Jax vs. Caine, Venom (Sony's Spider-Man Universe) vs. Riot (Sony's Spider-Man Universe), Mr. Krabs vs. Plankton, Heinz Doofenshmirtz vs. Aloyse von Roddenstein, Trevor Philips vs. Steve Haines, and Walter White vs. Gus Fring and Tuco Salamanca.

NOTE: Sometimes after an evil vs. evil battle has ended and a less evil villain defeated the true evildoer, the former might possibly reform and become a hero or maybe an anti-villain if they wish, in which case they will NOT qualify as Karma Houdini. In such cases, they involve a more sympathetic villain going up against someone much morally worse. However, there are cases of Pure Evil villains who can viciously dispose another villain who is not Pure Evil (if able), and in rarer cases, a Pure Evil villain will take on another Pure Evil villain so this category counts as such. See Pure Evil Vs. Pure Evil for more information.