Ms. Stonewall is an overweight woman with reddish-brown hair, a green skirt and blue shirt, as well as shorts that say 'USMC' (the United States Marine Corps) on them. She wears a whistle around her neck, and has red lipstick.
She is a rough woman, as evidenced by her getting kicked out of the marines for unnecessary roughness. She is harsh to animals, as she makes them run a horrible obstacle course and tries to get them to be afraid of humans. After Garfield saves her from her own dog pit, she runs off saying she never wants to see another cat.