Something like that happened to me, you know. I... I'm not exactly sure what it was. Sometimes I remember it one way, sometimes another... If I'm going to have a past, I prefer it to be multiple choice!
~ The Joker talks his multiple backstories.

Enigmatic Villains are characters who are surrounded in mystery. They often appear out of nowhere or have extremely vague pasts, and give little clue about their identity. You ignore their name, their true nature, or even their motives.

They are also very dangerous, intimidating, and unapproachable, because they are unpredictable, hard to understand and (most important) anybody does not know how to defeat them. Even when they are stopped, Enigmatic Villains leave behind many unanswered questions.