Millicent is a tall, athletic woman in her early thirties with piercing eyes. She wears the layered skirts and trousers commonly seen among the female officers of the British Royal Aero-Navy, although she has no insignia. Her hair and make-up are appropriate for an English upper-class unmarried woman.

Millicent speaks briskly and enunciates clearly, but is not particularly loud. She radiates an air of authority and stares unwavering at other speakers. She seldom smiles.