What You Really Need To Build A Character Is Exactly What You Don't Have In The Movies - Time. You Know, Movies Are Like A Line Drawing. You Have To Make Very Quick Decisions, Which Are, In The End Instinctive. Or You Make A Decision To Say "well, Maybe I Can Do That, Because... Oh, That Could Be Irritating After A While, Or Distracting, Etc. Etc." Some Of It Is A Matter Of Time, Always.