Crossover Matchmaking for Avon

The thought has occurred to me before, that since in one of the universes I write in, Cally is off with the Ninth Doctor, who is there for Avon? I originally suggested Romana, but I have been persuaded that, while he might respect and admire her, she wouldn't do the same for him.

So... in all the multiverse, who would be a perfect match for Avon?