Do you start fresh with new characters for each story/novel or do you have continuing characters? Myself, once I flesh somebody out, I can't stop writing about them. That's why I have all these spin-offs. From my first completed book, I've spun off stories for the main character's parents (both in the present and in the past as younger people) his cousin (and an entire town full of fully realized characters where he lives), each of his three younger sisters, the family of one of his sisters' boyfriends, another set of cousins. Plus my 1920s novel features the great aunt of someone my first main characters knows and I also have a couple of books set in 1880s California that are actually about relatives of my character.