I decided to go for a long shot here. I honestly don't know how he would be but I want to hear your opinions.
well, at first I was going to say thats some epic trolling you got going on there.... BUT then I remembered thats not impossible...
(lets seee...... Jake Loyd as Anikan.... Hayden Christiansen as Anakin...Arnold Swartzenager as Conan... swartzenager as Mr. Freeze... Tommy Lee Jones as Two-Face....that guy as Bane from Batman and RobinETC ETC)
Leo would destroy this role. He would make you forget that he is a prettyboy, dude smashed the Departed, Crushed his role in the Island, I mean, if you told me when Titanic hit Theater's that I would be a Leo Decaprio fan, I would have said you were insane, but dude, Dejango Unchained, that is all.