Batman had two different enemies named Wrath. The first, whose real name was never disclosed, had an anti-Batman origin very similar to Prometheus. One night, while sneaking out of their apartment to avoid paying rent, Wrath's parents were mistaken for burglars by the police and shot dead. Wrath became obsessed with taking revenge on police and other law-enforcers, which lead to a career as an assassin.
The second Wrath, Elliot Caldwell, was an orphan, one of five abducted by the original Wrath to become the equivalent of Robin, but Caldwell was the only one of the five to survive Wrath's training. Eventually, Caldwell took over as the new Wrath.
Pros: The purple costume is kind of cool, though it might not work in the Nolan-verse. Wrath's anti-Batman origin isn't as contrived as Prometheus'.
Cons: It's still a little contrived. And he's a total no-name villain.
How I'd do it: Show his parents' murder, then just cut straight to the pimpin' purple costume.
Casting Guesses: It could be anyone, so I'll say Clive Owen, cause I like him.
Verdict: Nah. If they announced Wrath, even most dedicated fanboys would be rushing to google to figure out who he is.
After The Scarecrow, Ra's Al Ghul, The Joker, and Two-Face, who should be Batman's next enemy in the Batman Begins/The Dark Knight series? Well, as of now we know that Tom Hardy will play Bane and Anne Hathaway will play Catwoman.
Check out the master list for all the villains covered. I've pretty much run out by now. Obviously, there are more Batman villains, but not any of significance that I know of. As of February 2009, no one is confirmed as a villain. Not the Johnny Depp Riddler, not Phillip Seymour Hoffman Penguin, nobody.