Well here's some questions I have already...
What's your major? Why did you choose UC Merced? What do you want to be once you are finished with college? Are you serious about school but do you still like to have fun? How serious are you about school? What are you expecting your GPA to be each semester? Do you like to study? Are you clean? What city and state do you live in? What do you like to do for fun? Do you like/play/watch sports? What's your favorite subject in school? Are you in a relationship? If so would have them sleep over in our dorm? Would you have anyone sleep in our dorm? Would you have a problem if I wanted someone to spend the night? What do you consider your bad habits? What irritates you? What's your hobbies? Are you the only child? Are you a clean freak? What time do you sleep? What are you study habits? What are your social habits? Do you snore when you sleep? Do you drink alcohol? What would you hate for your roommate to do in the dorm? Would you rather live in a double or triple dorm and which Terraces would you prefer?
UCM students you may use these questions if you'd like to when your able to ask your roommate questions.
This is all I have can you think of any more?