It is a housefellow, not an RA (resident assistant) at Res Halls. Dorms are divided into houses, hence the name. A house can be an entire building (Kronshage), more than one floor or a floor of a dorm building. Long ago UW stopped with roommate questionnaires as they found random assignments worked just as well.
Think about it- how would you answer questions? According to the person you think you are, your parents think you are, the person you want to be, the person you want to room with. That potential roommate will be doing the same thing. The slob may hope living with a neatnik will reform them (no).
You also need to figure out which dorm area and dorm type you would like. There is a great variety in locations and buildings on the UW campus. Before trying to find any roommate research the dorms. Many variables. My friends and I in the same major preferred very different settings. Your future roommate will have several things in common- you both prefer the same dorms.
There will never be a perfect match. One of you may need to be quiet, will need to not have that visitor, keep the mess to their area… You are not choosing your friend, you do not need to be friends but peacefully coexist. In fact, it can be nice to not depend on your roommate for your social life. You will learn a lot about yourself that first year of college once you are away from home and family. You and any roommate will change. I had one from a farm and she was much less an early riser after being away at college, I learned a bit about rural life. So many other experiences.
Do not worry about it.