He has all those different aspects to him, so I can more or less decide as a performer how I'm going to deliver a line in a particular scene, or play a particular scene in total.
Writers are socially observant. We find people endlessly fascinating, and real life is mysterious. Sometimes it's hard to stop staring at the strut and squawk of my fellow man. They can be quite inspiring. Sometimes it's hard to stop talking to them to see what in the world they're thinking.
Good acting is all in the writing. If it isn't on the page, then it really won't make any difference. You cannot act on force of personality alone.

