What about Quidditch teams? I think it would be a cool touch for there to be names to plug with the positions, even if it is only once for the sake of doing it, and then everyone reverts back to the "House Name and Position" formula. I dunno, I'm just a nerd who likes coming up with characters and who also dislike vagueness and think that would be a cool touch to add an element of realism to the RP. Maybe people in the same Houses can come up with the names for their Quidditch teams?