[Script] What do characters fear?

I really like this quote from Sid Field's Going to the Movies. It's Robert Towne (Chinatown) about creating characters. He first asks himself, What is this character afraid of? In other words, what is his or her deepest fear?

In Chinatown, Jake Gittes, a private detective specialising in "discreet investigation," has a certain reputation to uphold, so he does everything to make a good impression. He dresses immaculately, has his shoes shined everyday and has his own code of ethics. Gittes' deepest fear is not being taken seriously.

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