Lord, this writing business is tricky!
Once you've got your characters right, they don't want the plot as you wrote it. They won't do as they're told, or they wouldn't do it that way.
So what do you do?
In my case, I change the plot. I have to have a constructed plot, or else my characters run around wasting time and doing nothing, but I often change it half way through. Mainly in the small details, but suddenly a character will appear, and they seem to bring themselves to life.
It happened again recently. In a Department 57 book, I needed a computer expert, a walk-on part. Enter Candy. The Department 57 series is urban gothic, featuring shapeshifters, vampires and other Talents. My shapeshifters are mythical beasts. I don't do weres, just dragons, griffins and the rest.
So Candy enters. She's a dyed blonde, and proud of it. Although she spends most of her day using keyboards, she loves fancy manicures. And she's a basilisk, so she wears contact lenses. If she didn't, she'd turn everyone she looked at to stone.
So now people are writing to me and asking about Candy. I never meant her to be more than a walk-on, but the basilisk is taking over.
So what do I do with her now?