I would like to put my two cents forth concerning the Teifling. They are never innately good because of the demon in their blood, though they are not always innately evil. In a sense the race itself is generally very neutral toward everyone else. As well as Drow - they're too self serving to actually work with anyone else, not unless their using them. Who, of course, they would gleefully stab in the back, quite literally if I might add.