Robert Pattinson

Having a persona people recognize, it's the thing that probably gets you paid the most - but it's also the thing that virtually every actor in the world doesn't want. 'Cause, like, no one would believe me if I wanted to play something ultra-realistic, like a gangster or something.

The most fascinating powers don't mean a thing if the guy's poorly motivated or dull, and the most generic powers won't hurt a well-motivated character. Personality and motivation are what make Magneto, Magneto and not Cosmic Boy. The powers work for him, but it's his motivation that makes him the character he is.