Contessa
Mysterious bodyguard of the even more mysterious Doctor and murderous protecttor of Cauldron and it's secrets.
Background
Virtually nothing is known about her background other than that she was already in service to the Doctor when Alexandria was recruited in '86. It's unknown if she has retarded aging as some other Capes do.
Powers
Her exact powers are unknown, but she is a high level thinker and is very skilled all that she has been shown doing. This includes electrical repair, hacking, and melee combat.