It can certainly happen that characters in more sophisticated stories can "take over" as they develop and change the author's original ideas. Well, it certainly happens to me at times.
Margaret MahyFor in some ways the world was like a shopping centre, and he himself was a doubtful customer, often ineffectual, being talked into buying things he didn't want, things indeed which nobody in their right mind would want to buy.
Margaret MahyI don't want to die, really. I'm interested in what happens next, so I've got to keep on.
Margaret MahyReading is very creative - it's not just a passive thing. I write a story; it goes out into the world; somebody reads it and, by reading it, completes it.
Margaret Mahy