All of my characters tend to be montages of different people I've met: little bits and pieces of their personalities put together.
The characters in my stories, whether historical or fictional, usually prove to be a compilation of influences taken from differing sources, but never drawn from one model.
Some of my characters are a mixture of various aspects of people I have met. others are pure invention.
I can't have composite characters. I can't attribute dialogue to someone based simply on my memory and not based on notes taken at the time that the words were spoken.
I sometimes use some personality traits to fashion part of a character. Most of my characters are composites of either people I know or people in the public eye.
My characters are usually composites. I wish I could pretend that I make up all of these characters, but no. I steal from people. But people will say to me, "Oh, that's me!" and I'm thinking, no, that's not you!
'Gorilla Man' is a composite of a few individuals, but the song itself was actually inspired by James Taylor. I spied his 'Gorilla' album laying on my floor and in some altered state, instantly started singing the chorus. It was fun to write. There's an old notebook with at least three more verses in it somewhere.
I'm very, very leery of nonfiction books where they change timeframes and use - what do they call those things? - composite characters. I don't think that's right.