When you have to play a character that seems to be a relatively decent person and seems to be like yourself, I think the trick in that kind of character, so that you don't become a cliche, is to find where their weaknesses are.
“I didn't want to be a dancer. I just did it to work my way through college. But I was always an athlete and gymnast, so it came naturally.”
“Look into any man's heart you please, and you will always find, in every one, at least one black spot which he has to keep concealed.”