She is noted as, "small, round, and redheaded with a freckled face that wore a perpetual expression of distressed confusion, not unlike that of a damp cat." Gail Carriger describes her as, "Red hair, slightly curly (usually falling flat), white skin with freckles, eyes probably green, chubby, smallish, rather dumpy. Blushes a lot." As of Manners & Mutiny, Agatha has thinned out a bit around the middle and filled out in the bust.