Please visit her article on the South Park Archives for more information.
Sheila wears a midnight blue dress suit with a white shirt and a violet-red skirt underneath. She also wears beige nylons, red lipstick, and gold earrings. Her hair is long and red, much like her son Kyle's, and put up in a beehive. She is overweight and shorter than average height. She speaks with a rather broad Jersey accent.
Sheila is very protective about her family and has often led huge campaigns against beliefs and other such examples which she believes are unsafe, often going too far in her efforts and steamrolling her son in the process. She was the cause of the America-Canada War and was the leader behind "Mothers Against Canada" (M.A.C.). She also seems to be somewhat nosy, poking into things that are other people's business. For instance, when she found out that Gerald Broflovski and Stuart McCormick to be friends in high school she arranged a fishing date between the two (which had bad results).
Sheila is also quite quick to anger when she is challenged, or more correctly when someone tries to tell her she's wrong. An example being that she shot Terrance and Phillip when Kyle told her she was wrong in starting a war with Canada when all he did was go see an R rated movie, in normal episodes when Kyle tries to talk back Sheila raises her voice and punishes him no matter how right he might be.