The qualities I posses that will contribute to the university community is that I am simply open-minded and ready to take in more knowledge.
....no need of repeating those known facts. Make use of every word to describe how your qualities and characteristics contribute to the uni.
I don't think you should be so direct in answering your unique quality. Instead, you could possibly describe an experience, and show your unique characteristic through that experience. Does that make sense? I think it would be a much more interesting essay if you showed me your unique characteristic rather than just telling me. I hope this helps! :)
I like ChristianB's comment. If you declare that you are open minded, tell them an incident which describes your open mindedness. Such expressions would convince the reader about your characteristics and qualities better than mere statements you make.