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Ms. Rubella Mucus is a warthog who hates the Bean Scouts, claiming them to be "bitter, dim and crude". She actually planned on shutting down Camp Kidney by making them fail their physical test. She has a showdown with the Jelly Bean trio where it is revealed that she is extremely afraid of Bean Scout socks. She can play an organ and served as the organist for the Bean Scouts' theater. This is quite ironic for someone who despises Beans Scout to do something nice for them.

Because of all this, she is most likely the reason why some Squirrel Scouts tend to have a hate towards Bean Scouts in spite of having a very nice Scout mistress. Opposite of Jane Doe, she's rarely seen happy.

She is Ms. Jane Doe's assistant, with a type of Southern accent. She is also the person who blows the bugle for the Squirrel scouts to wake up and leads them in their morning routines.

She is portrayed as a large and angry, stereotypical redneck woman. She lives in trailer and hoards any Bean Scout toy that comes near it. One room looked girlish and childish and was filled with toys, while another room looked like an office with her desk and a large portrait of herself in the NS. A large plaque in her office reads, "Tough Enough to Do it Right". We see her carrying a taxi with Jane Doe as a passenger, which fits her tough personality; and bakes cookies using tire to knead dough, and a chainsaw as a cookie cutter.

Her hair is actually a wig which she takes off before going for a swim. Lazlo finds the wig and uses it to become "Madame Lazlo". While driving by Camp Kidney in a police car, apparently after reporting the theft of her wig, she finds Lumpus dressed as a ballerina, wearing her wig.

She is Acorn Flats' camp mascot, and also the scarecrow for Acorn Flats' sunflower garden. Ms. Mucus is voiced by Jill Talley.