^Huh? I didn't mean real-life personality, I meant onscreen persona -- the voice, the delivery, the expressions, the attitude. I have an image in my mind of how T'Ryssa looks and how she talks and acts. The whole point of this is to find an actress who can not only look the part but pull off the performance.
My mistake then, but from that description then you are possibly being a bit narrow minded.
Take Hugh Laurie as an example, not taking into account the span of years between the two productions, watching him in Blackadder the Third and Blackadder goes Forth as Prince George and Lieutenant George respectively do you think (and not using hindsight) he would have made a good Gregory House? An arrogant, condescending prick of an American when in both Blackadder's he is an upper class toff of an Englishman?