Villains who worship Satan or the universe's equivalent. Some villains who may worship Satan or something close to that is doing it to save their families or loved ones or they do it but don't harm others according to certain beliefs. However, if they are willing to commit heinous deeds and think that is how they will worship their Satanic gods or so and are okay with it, then they can qualify.

To know more about Satanism in real life, go to Satanism | Religion Wiki | Fandom.