This is Muffy Crosswire of Arthur dressed in a keyhole sweater.

Mary Alice "Muffy" Crosswire is a third grader in Mr. Ratburm's class at Lakewood Elementary. She is the richest girl in Elwood City, and lives in an enormous mansion. Muffy entered Lakewood in second grade, when she met Arthur and his friends and quickly became best friends with Francine. She is often labeled as snobbish and spoiled because of her wealth, attitude, and frequent selfishness.


Muffy often has lack of empathy for everything and believes that money, Bailey, and her father can fix any problem. However, in some fields Muffy is good at giving advice on things like fashion or love. She is usually the first one to catch on to a fad or a trend.

Like Arthur, she is in the third grade, but in contrast, she is fashionable, stubborn, beautiful, and very wealthy. She is often labeled a snob and spoiled because of her wealth, condescending attitude and frequent selfishness, as shown particularly in the episode "Spoiled Rotten". However, Muffy can be quite mature at times. Muffy is also shown to be quite popular, as shown by the many parties she hosts. Like her father, Muffy is also good at doing business with people. Despite all of that, Muffy has a knack for being friendly, cares a lot about her friends, loves to hang out with them, and they usually has a lovable friendship. Without Francine, she would be very very hurt and would cry a lot, but at least she would have Fern, Prunella, Arthur, and Binky. If they weren't there, though, she would cry even more and would ask for them back. Muffy's spoiled home lifestyle has left her somewhat naive when it comes to certain basics of domestic life. She, for example, did not know how to wash dishes by hand in a sink, believing that she could get the job done simply by squirting some dishwashing liquid on a pile of dirty dishes sitting in a sink. ("The Great MacGrady")