Does anyone else do this? Sometimes when I'm writing a character, things just feel right for them and sometimes I learn about their background or personality quirks totally organically.
Obviously there are two schools of thoughts on characters as much as plot: the ones who plan out every detail, and the one who just writes. I'm somewhere in the middle, I don't care what colour my character's walls are (unless I have to draw it) or every partner they've ever had unless they're important to the plot. A lot of the time, it's on the fly and the characters are doing their own thing as naturally as possible and my role as author is more to make the universe conspire to nudge them in the right direction. I know just enough the characters reveal the rest as I write them as it becomes important.I know some people think "the characters just did it on their own" is a cop out, and in many ways it is, but when you know a character well enough, their reactions should be natural, and if you have to force them into the direction you want them in there's something wrong with your character plan or the plot. Just because they're your character doesn't mean they can't be written out of character.
So, what's everyone else think? Have you learnt things about your characters they've just revealed as you're writing them? Have your characters ever surprised you? If not you think you'll ever be surprised by them or are your character sheets too detailed for that?