Source: comicvine.gamespot.com
7. Two-Face II
Look, of course there's a second Two-Face.
He's very clearly nowhere near as notable as Harvey Dent, but he's still a part of the Batman canon, so we need to talk about him. First, the Golden Age version.
Paul Sloane was a hugely successful actor who was hired to play Two-Face in a movie based on the criminal. But a prop guy was angered by his girlfriend's crush on Sloane, and in the biggest overreaction in the history of overreactions, he switched out the water in the acid-throwing scene for actual acid, and Sloane got his face all scarred up and ruined. Just like Two-Face. So he became the new Two-Face.
The post-Crisis Two-Face II was Paul Sloan (without an "e" this time), an actor hired by a gang of villains to impersonate Two-Face. However, this resulted in Sloan going crazypants and thinking he was Two-Face. The real Two-Face found him and scarred him for real, turning him into an even crazier crazy man.

