on Fiction University:
I do the bare minimum necessary to create a character, then I throw them into my story and see what they do. By the time I’ve written the first draft, I know who they are and can revise accordingly.
Although I’ve written this way for decades, I’m not sure I’d recommend it. It’s an interesting tactic, but it has left me with a lot of revising I wouldn’t have needed if I’d done a bit more character work before I started writing.
Lately, I’ve wondered if I should change my process, or at the very least, add another layer of character creation at the start. Because I’ve always said that characters drive the plot, and I’m a plot-driven writer, so my process is missing a critical aspect when I think about it from that perspective.