Standing about 5' 6" this woman is a lithe yet curvy being in her mid Thirties. Not a single scar on her, her face is a porcelain white. Smooth, perfect. Full lips and a tiny nose. Blue eyes are sharp and filled with purpose and emotion. Straight long and dark hair, sometimes put up in a tail.
Retsu is wearing a pair of grey pants tucked into dark grey, almost black workboots, and a matching grey shirt, buttoned to the collar with a silver Alliance badge at the throat. Over that she is wearing a Navy officers' uniform jacket in the same grey with black trim outlining the chest area, with a Lieutenant's rank insignia on the left shoulder and Unohana picked out on the right. OVer the jacket is a white lab coat usually but not always.