Mary is the daughter of Seymour and Dilliss Wendle. She is a single mother raising Clarence with the help of her live-in boyfriend, Chad. Clarence's father, Damian, is absent from the series, though the circumstances surrounding this have not explained. Mary speaks with a Jersey-ish inflection and is mostly a down-to-earth family member. Throughout Clarence's adventures, Mary keeps a cheerful, fun attitude all the while keeping him in check.
Mary is well-rounded portrayal of a lower-middle-class single mother. She's patient and loving to her high-energy son, Clarence, but also also crafty enough to get him to help with chores (by making it into a game). She likes to make (and eat) "Pizza Poppers". ("Pilot")
Mary is also sensitive to saving money and uses coupons when grocery shopping; she also buys healthy foods such as organic fruits and skim milk ("Lost in the Supermarket").
Mary is a curvy woman who usually wears a pale yellow t-shirt and tight pink pants with dark brown boots. Like Clarence, she has pink skin and blonde hair. Mary also wears red lipstick and has a tattoo ("Hurricane Dillis").