It's obvious that if you're going to play a character you need to amass information about that person and about their environment or their era that they're in and use as little or as much as necessary.
Explore more quotes
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 But in real life I'm a little more withdrawn.