The character that changes the most is Bernie. He changes from thinking "this is the worst team ever" and then when they start to win thinking "We rock". Another character that changes is April-May-June. As Bernie says she is his girlfriend but just dosen't know it yet. She cheers for the boarding school's soccer team becasue they win a lot of the time. Later when Bernie's team starts to win she cheeres for them.
The problem of this story is that Bernie is on a losing team and he really wants to win. With the biggest, strongest girl in the school liking him he gets her to play for the team and they end up winning the championship. I feel good about how the problem was solved, but I don't think it was right to just use Jennifer( the huge one) into winning the season. The authors message was that you should keep trying no matter what.