Muffy Crosswire- Arthur; 3rd grader in Mr. Ratburn's class at Lakewood Elementary. She is the richest girl in Elwood City, lives in an enormous mansion. is often labeled snobbish spoiled because of her wealth, attitude, frequent selfishness. believes that money, Bailey, her dad can fix any problem. However, in some fields Muffy is good at giving advice like fashion or love.