Originally, The Lady Christina de Souza was an old-fashioned thief. Not a thief for the money, but a thief for all the thrills and to see if she could get away with it. She comes from an Aristocratic family, but is board with this life and so seeks the thrills that only crime can offer. She is a thrill seeker, loves to play games, and taunts death at every turn. She met Doctor #10 on a double decker bus and a thrill ride to a planet called San Helios. She then got away on the flying 200 bus and ran into the Doctor - #10 and #11 while trying to steal some very elaborate objects.

But this is the Lady Christina de Souza 2.0. She is an exact clone of the first, but has lost some parts of her memory due to the cloning process. (She was grown out of mold from the Doctor's psychic paper journal.) Her memories of her past exploits are slowly coming back to her, although they are mixed with the other companions that are in his journal as well; and there are a lot of companions he has traveled with. After running a B&B in Wales, she went back home and spent some time with her Aristocratic family, yet was unfulfilled. The pull of adventure and the thrill of pilfering has drawn her back, but she needs help to regain all of what she truly once was. She needs the Doctor. So she climbs aboard the 200 bus that she had hidden away and goes in search of him...and more importantly, she goes in search of...herself.

She is 5'7". Don't ask a lady how old she is or what she weighs. She has hazel eyes and is a brunette. She carries an "heir" about her.