User blog comment:Magma MK-II/Characters that shouldn't be here, Part 3: Return of the Revenge/@comment-366087-20151230223311/@comment-4708882-20151230234508

Two of those count for being serial killers.

With Punisher it can vary from writer whether on how bad but a few writers have portrayed as just a delusional mass murderer. He has also been an antagonist of heroes like Spider-Man and I assume others. In Greg Rucka's War Zone he goes up against the Avengers themselves apparently.

Dexter is a serial killer admittedly his victims are typically seen as worse it's still morally and ethically wrong and considered villainous. Here a link to a page outside our wiki from TV Tropes (just a supporting exampl). He considers himself a necessary evil that takes care crinminals who otherwise would get away. Villains can have morals or personal code the only type that absolutely can't is Complete Monsters. Even if you don't count the fact a serial killer which is a villainous trait on its own, he tries to frame one character who from what I found was another cop who didn't trust him and tried to kill a person who was trying to bring him to justice even if she wasn't too likable from what I hear. Even the Dexter wiki has referred to Dexter as a villain protagonist on at least two pages.