SCP-166 appears to be a female human in her late teens, of average height and slender build. Medical and physiological analysis indicates several deviations from baseline human norms, including accelerated hair growth (approximately 20cm per month), vulnerability to airborne particulate matter such as cigarette smoke and aerosols (which can induce symptoms similar to an acute asthma attack), increased sensitivity to pressure ulcers, and alterations in dietary requirements. Can't wear clothing.