Characters are Formless Spawn.

@ZiggyKinsella that runs the blog The Feckless Goblin posted this question on Twitter. "What's your top tip for developing the characters in your book?"

I could tell you I spend days in research, I take out long questionnaires and fill them out. I could tell you  I have notebooks full of dates and times and mini stories backing up the character. I could tell you that, but those techniques do not work for me.

I have tried them. And sometimes when I get stuck I will do a little "what if" scenario...