Agatha is the Duchess of Berwick’s daughter. She is a quiet young woman who only says “Yes, Mamma,” though her mother considers her a “chatterbox” and is always saying what a clever speaker Agatha is. Agatha behaves as a model of ladylike politeness and submission throughout the first two acts. She gets engaged to Mr. Hopper at the end of the party, much to her mother’s delight, and agrees to move to Australia with him.