on Fiction University:

Characters drive the plot through their actions, and some drive it more than others.
Believe it or not, your characters can offer you a wealth of story ideas. If you’re feeling stuck about what to write next, don’t worry. No matter what genre you write, character-driven stories are always a hit with readers. With a little brainstorming, you can generate endless ideas from any of your main characters. Here’s how to do it.