[Dr. Boogie]

The Mechromancer. It's not in the full game, but if you preordered it, you get it for free when it comes out a couple weeks later.

Apparently they called it "the girlfriend class" because it works for people who suck at FPSs so they don't feel left out of the game. Later, the designer who said that had to quickly recant his statement on account of people not liking "girlfriend" being used as a euphemism for sucking.