I visit family in Champaign several times a year and eat here at least once every trip. They offer a variety of pancakes and omelettes and some healthy breakfast options as well.
This is a very popular restaurant, so be prepared to wait, especially on weekends. The wait usually isn't too bad--it is a large restaurant , and they are efficient; they also provide free coffee while you wait and have a large waiting area with seating.
Dress is casual. You will fit in best if you wear a sweatshirt, tee shirt or cap with name of your favorite sports team on it. Although Illini gear is understandably the most popular with Cardinals second, you will see a large number of other universities and professional sports teams represented, in addition to local high school and youth leagues.