Something I've noticed in writing is how the author portrays themselves in the main character. In my stories you'll see a little bit of me in Techno, and now Tommy with my new story. But, I was reading a story a couple seconds ago and noticed that Tommy isn't his actual witty loud charismatic self, he was very quiet and artsy, which Tommy irl doesn't show himself liking art very much, so I'm pretty sure that writer likes art and drawing. Read any story and you'll be able to pick up on what the writer likes. It's fascinating tbh.