First of all I would like to make one thing quite clear: I never explain anything.
~ Mary Poppins

Mysterious Heroes (or Enigmatic Heroes) are characters 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 intimidating, because they are unpredictable, hard to understand, and, most important, you do not know how to defeat them. Even when they are shown, enigmatic heroes leave behind many unanswered questions.