So when you write anything the first thing which comes to mind are who are the “good” the ‘bad” and the “others”
Even when you write non-fiction. There is a difference though, the people are real. Sometimes you hide them a bit by creating composite people– not the same looks or different mannerisms. But the real story non the less.
Is this a good thing?
It is often done more in fiction, and some people will see themselves in a character, but not always.
That is the beauty of writing the blank pages and the challenges.