Molly MacDonald

Molly MacDonald is a fourth grader and a member of the Tough Customers. Despite her tough exterior, she has shown her more creative side in episodes like The Agent of Change.

Her younger brother is James MacDonald, who is also DW's friend and classmate. She enjoys listening to the heavy metal band Mütakrüde, and taking care of James. In Arthur Makes Waves she and Arthur become friends, though they have to keep it secret due to their friends' disapproval.

Her eyes are always covered by her long hair, unless it is flipped over to the side. Like Francine, she is a tomboy.

She also has a Scottish uncle named Miles, which means that the MacDonalds also have a Scottish background.

Personality
Molly is a tough tomboy-like character. She can be rude, selfish, and a bigger bully than Binky at times. Despite this, she still gives great advice, and she helps her younger brother James. In Mind Your Manners, she gives some practical advice to the Tibble Twins, while showing courtesy to another customer. Molly has a complete change of heart in The Last Tough Customer after witnessing her brother James bullying another child, and resorts to fully stop being mean to others.

History
In the episode "The Last Tough Customer" it was revealed that she was bullied as a kindergartner. That event marked the day Molly became a bully. Before she got bullied, her hair was put up in a bun on top of her head, giving her the name "Muffin Head".

James MacDonald
James and Molly seem to be quite close, James has been shown to turn to his older sister for advice on many occasions.

Arthur Read
Arthur and Molly are shown to be friends in a few episodes, but usually they aren't by the end of the episodes and series. This public attitude, however, is just a cover for their secretly staying friends.

The Tough Customers
Molly seems to like the tough customers very much. In "The Last Tough Customer", she didn't want the Tough Customers to be nice. Also in "The Law of the Jungle Gym", she didn't want to give the Jungle Gym to Muffy for her photos. She seemed to like the Tough Customers more than Binky, Rattles, and another kid.