<p>All of the advice here regarding the roommate should be prefaced (expressly or implicitly) with "assuming that the OP is painting the full and complete picture."</p>
<p>Giving advice to the OP, however, is not "ripping her to shreds" just because the advice isn't what she was hoping to hear and if it is directed to her and not to the D or D's RM. After all, the only thing we DO know for sure from this thread is what the OP's perception is and what sorts of things trip her alarms. We can speak to her distress (which I consider to be real) far better than we can sort out a roommate conflict (which OP considers to be real).</p>
<p>If there was a way to bet on this, my money would be on the two students becoming good friends because they have something to offer to each other with their differing personalities. I assume they will both find ways to be successful in college in their own ways and they will open up each others' eyes to new points of view. I wish them both luck and success...and I hope the OP can find a way to get to that same place.</p>