Fifth Corsair

The Fifth Corsair once got drunk with the Doctor and woke up with him either in jail or the vaults of the Bank of England. She had the smallest Ouroboros tattoo of any of the Corsair's incarnations, with it being the size of a ten pence piece and located on her upper thigh. (PROSE: Eleven Things You Probably Didn't Know About the Corsair)

Behind the scenes
One of the unplaced incarnations seen in the illustrations of Eleven Things You Probably Didn't Know About the Corsair is of a female Corsair wearing red Gallifreyan robes. An ouroboros tattoo is visible on her thigh, but it is located on her lower thigh and much larger than a ten-pence piece. It is possible that she was intended as an illustration of the Fifth Corsair despite the discrepancy, although her clothing may instead suggest that she is the Corsair's original incarnation before becoming a Renegade.