Anakin, Batman, and John Connor. I don't see any notable similarities rather than the fact they fall under the very, very broad category of "dark." That's a far cry from being a typecast.

But had he been Anakin instead of Bruce Wayne, I have the feeling Star Wars wouldn't have boostered his career as Batman did. Rather it would be something he'd have to fight to overcome, like McGregor and Portman.

Had he been in the role, the prequels might very well have been more warmly received critically. So the obstacles MacGregor and Portman face now might not have been there. Of course this is all speculation, not to mention completely beside the point.