Well, either the Sniper or the Soldier. The Sniper because he'd have a plan to kill me (he probably wouldn't, but still), while the Soldier is a complete and utter raving psychotic maniac. And the Spy of course, who is a master of stealth and quite possibly a sadist. And the Pyro with his flamethrower..... oh dear, let's just keep it at "pretty much every single one".