I've been on the show for six years and I don't even know what her history is. I sort of make things up in my mind, but I think it's hard for an audience to follow and invest in a character when they don't have the details.
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This friend of mine said he was surprised to find that - I don't think it's quite a majority - a bigger percentage of actors are introverts than extroverts. It was a big surprise to him. Now, I know me, and I'll do anything if I'm playing a character. Or anything that's true to the character, anyway. But in real life I'm a little more withdrawn.