A robber minifig, from the 2013 Lego Advent calendar. But instead of holding a coffee cup, Trevor will be holding his trick-or-treat pumpkin. If I had a million guesses, I never would have come up with that. But it actually seems pretty easy. Trevor owns black pants and a knit hat, so all I need to do is make a striped shirt, a mask, and a red bandana, then add a belt and some rope. He's unsure whether he wants yellow skin or not. I'm going to insist on the mustache though.