I recently had to write a flashback that takes place a good few years before my main characters get together. It was about one of my MC's and his interaction with a different character who turned out to be mega nasty, like mouth dropping 'you did what?' nasty. I realised after I'd wrote it, I'd done it completely wrong and had to re-write it. The thing is, although the re-write is spot on and how it should be, it's shown my main character in a light I don't like. It's shown him to be, at that time, a soft centred walkover with no clout whatsoever. A man happy in a job with no real get up and go, a good job but with no interest in moving forward. A somewhat kind of lapdog person where his lady is concerned. He will do whatever she asks, regardless of whether or not he wants to. I know exactly why he's like that because what happens to him, changes him into the character he now is, more determined to reach the top of the ladder, focused on his life and making himself happy but still retaining an element of doing things to keep his new lady happy, unless it means doing something he's not happy about in which case, he would stand his ground. But just for the time I was writing the flashback, I really hated him. But it also made my test reader hate my evil character even more that she already did! Have you ever found out something about you character that shocked you, something that you never initially intended?