I was going to comment on this before, but forgot about the post.
I personally feel that any creators (writers, artists, etc.) put a bit of themselves into everything they create. Sometimes it's more obvious than others. For instance, I have an rpg character who I'm fairly sure is autistic (a trait he shares with his creator, me). At the same time...I never set out with the intention for that to happen; it just became more and more apparent the more I wrote him.
I don't know if that helps at all. It's not as obvious with most of the characters I write, I think.