What is the greatest joy of writing for you?
The unexpected! Seriously, when you create fully rounded characters they tend to start dictating to you how they should behave, what they should say or do and WHEN they should say or do it! You start off as their creator and become their servant... occasionally I can wrangle them to do something, but there is always some extra kick that comes out of any encounter.
If you have created these characters, surely they can't surprise you? Really?
They can, and they do. I have taught creative writing classes and had this quizzical reaction before - and then seen that turn around into joy - and a look of utter shock on a student's face when they have the exact same thing happens to them! Even as I write, characters can reveal all sorts of secrets buried in their past... the joy of writing is that I am almost on as much of a voyage of discovery as my readers are.
Read more of this interview.