|Hair color||Brown (s1-s5, s14-s15)|
|Residence||Crosswires' Mansion, Elwood City|
|Family||Mary Alice Miller (great-great-grandmother)|
Edzel E. Crosswire (great-grandfather)
Taffy Crosswire (great-grandmother)
Olga Crump (great-aunt)
Ed Crosswire (father)
Millicent Crosswire (mother)
Chip Crosswire (brother)
|Book debut||Arthur and the True Francine|
|Cartoon debut||"Arthur's Eyes"|
|Voice actor||Melissa Altro|
Mary Alice "Muffy" Crosswire is a third grader in Mr. Ratburn'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 is a medium-skinned anthropomorphic monkey. In the first season, she was rendered with buck teeth, but they seemed to have disappeared in the later episodes. Her usual outfit is a purple dress over a long-sleeved white blouse, finished with black Mary Janes with knee-length white socks. Muffy's hairstyle consists of two long auburn braids tied with a pair of matching purple bows. She is seen with this hairstyle in most of the episodes, but sometimes changes the style, especially for a formal events.
Her pajamas consist of a purple and white nightgown under a lavender robe, and pink slippers. Her swimsuit consists of a purple mailot with an orange stripe.
In the summertime, Muffy wears a lavender t-shirt with a white collar, a green skirt with two pink stripes that are horizontal and vertical, and wears green flip-flops.
In "Muffy's Art Attack", Muffy wears the first outfit that consists of a green and purple striped bodysuit, a purple dress with green and purple pockets on the front, and black Mary Jane shoes. She wore this with her double braids and her pigtails. Muffy wears the second outfit that consists of a blue collar shirt that has sleeves being rolled up above her elbows, white overalls, and brown dress shoes with brown laces. Muffy wears the third one consists of a yellow shirt, a salmon jacket over her shirt, a blue skirt, blue tights, and black Mary Jane shoes. However, she still wears the second and third outfits in later seasons until Season 14.
In "How the Cookie Crumbles", Muffy's third outfit is originally a blue dress and a white jacket over her dress.
In "Matchmaker, Matchbreaker", Muffy wears a purple version of the third outfit, but the shirt is still yellow.
In Other Media
In the Living Books computer games, Muffy had a brown complexion, dark brown hair, and buck teeth in Arthur's Teacher Trouble. She subsequently had her complexion changed to pale, her hair color changed to light brown, and her buck teeth removed in Arthur's Birthday. It was likely due to color and tone restrictions during the 16-bit era of computers and software. Her vocal tone was a bit deeper, as she was voiced by Janice DeMichael Rogers before the cartoon show replaced her with Melissa Altro. In the later games, such as Arthur's Thinking Games, during the 32-bit era of computers and software, her appearance was the same as she looks in the cartoon show.
Throughout the series, Muffy had many alternate hairstyles. She gets her hair done for many occasions, and her favorite place to go hairdressing is the Salon de Beauté. Some of the episodes she is seen with different hairstyles include "Francine's Bad Hair Day", "Muffy's Art Attack", "Lights, Camera, Opera!", "The Lousy Week", "Don't Ask Muffy" and "The Election".
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 8 years old and 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, 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.
Despite having a huge mansion, Muffy's family is quite small. She lives with her Father (Ed Crosswire), her mother (Millicent Crosswire), and her butler (Bailey). Like D.W., she refers to her parents as "Mommy" and "Daddy". Muffy has an older brother named Chip, who was first referred to in Arthur's Perfect Christmas, but did not appear until "Matchmaker, Matchbreaker".
- Francine Frensky - Muffy's best friend. Though they are different in numerous ways, they always manage to find something to do together, such as in the episode Muffy's New Best Friend. The girls met when Muffy moved to Lakewood when they were both in second grade. They got to know each other better when they found out that they had the same middle name, "Alice."
- Fern Walters - Muffy and Fern did not frequently do things together in the earlier episodes, excepting Muffy's sleepovers. One episode, however, that Muffy and Fern got along is "Phony Fern", where they are seen hanging with each other by watching a movie and talking to each other on the phone.
- Prunella Deegan - Muffy and Prunella are seen together when they shop and have sleepovers and when there is an event at school or anything formal. In "Sue Ellen Moves In", it is mentioned by Arthur that Muffy did not immediately take to Prunella, befriending her only after a period of dislike.
- Arthur Read - Muffy and Arthur may not hang out a lot, but they are still great friends. They both have the same birthday: May 25th. Arthur is pretty annoyed when Muffy talks about shopping and playing with her polly action figures, but despite all of that, they are still great companions and like and care for each other.
Muffy is also friends with Buster, Brain, Binky, Jenna, and Sue Ellen. In "The Trouble with Trophies", Muffy's relationship with George seems to have grown. They agree to work together to try and give Fern a trophy. Muffy wasn't exactly friends with George in past series but she is now. However, she made fun of him in "Vomitrocious!" and he is often forgotten by the main group of friends.
Muffy is also close to her butler, Bailey. He performs her every order, and sometimes advises her, as well. In "The Butler Did... What?", Muffy realized she did not know anything about Bailey, and was very hurt when she believed that Bailey had run away. In the conclusion, she shows a considerate facet of herself, and vows to learn everything about her butler.
- It is revealed in "Muffy's Soccer Shocker" that in a possible future, well after the events depicted in normal episodes of the series, Muffy has a son who takes after her.
- Her speaking debut was also in "Arthur's Eyes" and her first line was "How do you get in trouble with the nurse?"
- Muffy had two front buck teeth from the episode "Arthur's Eyes" to "Arthur, World's Greatest Gleeper". It was also shown in "The Scare-Your-Pants-Off Club!", but they would disappear in some scenes.
- Muffy's first hairstyle was seen in "Francine's Bad Hair Day". The style was called "Prom Queen" by her hairdresser.
- Muffy is one of the few characters on the show with cell phones. Not only does she stand out in her mere possession of a cell phone, but she also has more than one. Its first appearance was in Francine's Bad Hair Day, her second in "Fernfern and the Secret of Moose Mountain", her third in the first part of "Phony Fern", and her fourth phone (Portalex 360) also in "Phony Fern". Every single one has been a flip phone.
- It has been stated that Muffy takes tap and ballroom dancing classes after school.
- Muffy's quote "Vomitrocious" first appeared in the book Arthur's Thanksgiving, but became more and more common in the cartoon.
- There are at least eight episodes that have Muffy's name in the title.
- Muffy has been voiced by Melissa Altro since the first season. Altro is the only voice actor to begin voicing their character as a child and continuing to do so as an adult (she was 13 when she began voicing Muffy). If one listens carefully, one can tell Muffy's voice differs across seasons, sounding higher-pitched in the earlier ones.
- In "Poor Muffy", she is revealed to be allergic to the odors of new carpets her family was once putting into their mansion, but began removing when they learned about her allergies.
- During formal occasions, she sometimes had her frontal hair cut into bangs.
- Muffy and Francine have the same middle name, Alice.
- She is the substitute (and relatively unskilled) goalkeeper for the Lakewood Elementary Soccer Team.
- In "The Contest", the last scene parodies the teenagers in That 70's Show. Muffy seems to represent Donna.
- Also for the Lakewood Elementary Soccer Team, she is their cheerleader.
- Muffy is somewhat spoiled. In "My Club Rules", she kicked Francine out of her club for not showing up on one day because she was sick.
- In "The Great MacGrady", it was revealed that she had been sheltered to the degree that she did not know how to wash dishes by hand, believing that simply squirting dishwashing liquid on a sink full of dirty dishes would be enough to get the job done.
- Her Dad likes to refer to her as "Muffin."
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