Karen's mobile form is a Mark II Surplus U.N.I.V.A.C. (Universal N.I. Variable Automatic Computer) model, which contains a light blue head in the shape of a desktop computer, a black screen, a silver stand, and a silver base with wheels. From seasons 4 to 9, there are two red keys on the base. From the second half of the ninth season onward, the keys are aqua-colored. Karen speaks with a heavy Midwestern accent. Karen was revealed to have Four Computer Chips: Snarky, Evil, Smart, and Empathy.