HOW WELL DO YOU KNOW YOUR CHARACTERS?

This is a question I see come up constantly in the writers' groups I'm in online: How do I create a character outline? What do I need to know about my character? I'm having trouble developing my character -- does anyone have a good outline?

I have 100% been in this space. I have a novel that I outlined years ago using the Snowflake Method (one of the methods I used as inspiration in building The Story Map). And I have a 1-inch binder full of double-sided printed pages, just of this outline (an...