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.
My dad instilled in me a great sense of humor. I wasn't bullied at school because my outward attitude was confident, and that helps.
I was surprised that the TV series was popular itself, but after that it went on to become more popular over the years and thus it seemed eventually that they would turn it into a movie.