Only a few have actually made it to the dorms. It's like fishing; set up an attractive bait in the room and wait for someone to fall for it or something. See, like me; I subtly mentioned that Damien's room is the first one of 'em all, 1A, so anyone that's lazy enough like to not be able walk past the first room or just ones to be there should be greeted by Damien. Once his there, in any case. Lol. Most characters need a roommate, anyway; considering not everyone has started. And if nothings results satisfying, you could pair with an NPC; so virtually it's the whole room for yourself.