I understand pain very well, so I look for that in a role. If the characters are well-written, don't tell nobody, but I'll do the damn thing for free. I'm serious. It's the writing. I love beautifully flawed characters.
At the core of every person or belief, there's a pain and a thorn. There's always something, whether it's a physical thing, a health thing, or an I wish I had someone or something in my life thing. We all know some level of pain, so I like to see the ugliness of characters. It's a side that we show, only when we strip down in the bathroom mirror.