A wiry woman with a mousey disposition, a couple inches short of average height. Her hair is maintained in a short pixie cut, and she dyes it a new and exciting color every month or so, almost ritualistically. Currently, that color is a light brown. She wears a pair of simple, rimless glasses which get switched for a pair of mirrored aviator sunglasses in the field.

She never dresses more formal than khaki tactical pants and a wrinkled dress shirt. Left to her own devices, her day-to-day outfit involves jeans and one of a menagerie of old concert t-shirts, mostly featuring punk or metal bands that Sidney's never actually seen or, in some cases, even heard of.