We're talking fiction here. Have you written a bad boy and made him your protagonist? What about a bad girl as your heroine? And are we really talking "bad"? Or are we talking rough around the edges with a good heart?
Characteristics of the bad boy can be all kinds of "bad". Same with a female. There's the connotation factor which plays into the bad boy image. And that image doesn't go with a truly evil character. The predominant "bad boy" usually plays tough but is tender on the inside, often only visible to his love interest who isn't the "bad girl" type. The "bad girl" is generally tough too because she's been through hard things and remains a survivor. The heroic "good guy" breaks through her walls and exposes the softness she's had to suppress just to make it in this world. Sound familiar?
So. Have you written either type of character I've described? Or do you recall either type from your reading of novels? I can think of a few I've read . . .
Father, we often lose our reality in forged images of ourselves. Help us to be real, to be who you created us to be, and to write real too. In the Name of Jesus, Amen.