I get to know my characters by writing about them. The first rough draft is really about me finding the story and finding the characters. I don’t typically know them real well at first. It takes the first writing and a few edits for me to really get to know a character, and even then I might still not know their favorite color.
On the other hand, most of my characters have been involved in one or two mental adventures, so I have a general idea of who they are, how they react to suffering, and who they love. I still don’t know their favorite color.
My stories are quick and viseral. We don’t really have time to discuss favorite things.