Thief. As a matter of fact, I would be popular in the papers as "The Thief Without A Silly Trait". I'd be known for not leaving ridiculous clues in the area of my heists, inviting the police to puzzle them out to stop me.
But seriously, I'm rather stealthy, I'm observant, I blend in well in crowds (which helps when staking out a possible heist), and I understand how security technology and techniques work. I wouldn't be lifting Rembrants from the Louvre, but I could probably master knicking some knick-knacks (or is that knacking some knack-knicks?) from the reasonably wealthy.