The Scout, The Assassin, The Lieutenant (Tennant!!), The Scribe. Also some old ones from classic Who are Corsair, Monk, Rani, Master. Sorry I can't think of more. Curious that Romana never went by anything. What do you need these for? You've probably finished writing it by now anyway.
If you can't get out of your comfort zone, you'll never find what you're looking for. Don't make things quick and easy to feel better short term. Make a change and then you'll feel better longer term. — Frinderman