Besides being The Villain, that is? Case in point: Gru, the villain-turned-protagonist in the Despicable Me movies is a stereotypical Professional Villain. That's why he makes such a great cartoon character. He's filthy rich with no explanation of how he got that way, he's got hoards of minions at his beck and call, his house/headquarters sits in plain sight in the middle of a large city and no one seems to wonder what on earth he's getting up to in there or even care . . . The James Bond villains are more of the same. If you're writing fantasy you just make him the biggest, baddest wizard or mage in the kingdom. Or she can be the Evil Monarch. But what about stories set in real life? What if you're trying to write a villain/evil antagonist who's a little more real, a little-- no, a lot-- more rounded? Are you making his or her profession the field for his villainy? Or is his villainy a separate thing like a hobby or cause? And in that case, what finances it?