Who was your favorite character?
For me it was the music instructor, Herr Klesmer. In summing up various characters' musical abilities, he was honest without being mean. He simply didn't like to see mediocrity passed off as excellence.
I got the sense that he really would like to have helped Gwendolyn become the best singer she was capable of being. Same with Mirah. His attitude toward her was, basically, "Well, your voice will never fill a big concert hall, but you can be an excellent drawing-room singer, and I can help you."