She is over 400 years old, with granite colored hair, "rheumy" eyes and is said to be very creepy and scary.(reference needed)
She has "precious little gift when it comes to actual combat magic".
Ancient Mai is Chinese and, as Harry Dresden describes her, she looks a delicate and frail as an eggshell teacup. She has long white hair with jade combs holding it up. She still has a haunting, ethereal beauty, though old even by Council norms. Her eyes are dark, peircing and merciless.(reference needed)