Source: dc.wikia.com

4. Black Mask

Roman Sionis was the child of a rich family in Gotham. But after seeing how they pretended to like people in order to improve their social status, Roman became bitter and jaded.

He was also attacked by a raccoon.

That’s true.

Roman would later burn down his house with his parents inside. After he destroyed his father’s company, he broke into his crypt and smashed up his coffin, then fashioned a skull mask out of the pieces. Taking the name Black Mask, Sionis became a crime kingpin in Gotham, and usually rivaled Penguin and Great White Shark in power. Mask has done some horrific things in the past, most significantly that time he tortured Spoiler to the point of near death. As a big mob threat, he’d make for an excellent antagonist in a Batman movie. That way, you could do a story about Batman fighting organized crime, but you’d have an antagonist who’s more visually interesting than a Falcone or Maroni.