One of my first books was Shark and Lobster's Amazing Undersea Adventure - a tale of Shark, who is afraid of Tigers, and his best friend Lobster.
It was very hard to write - I had already written one draft years before when I was still in school, and now I had to learn how to rewrite and edit and make a picture book story of it.
One thing I did then, which I've kept up since, is make a diary for my characters to see what they got up to and who they actually were.
I did find out a lot about Shark and Lobster this way, almost none of it made it into the book, but that's not the point of character development work.
I thought it would be nice to stick it on my blog so that you can see how I work (or how I worked when I was starting out in 2001 - I've gone lest wistful over the years, but my approach is still very similar).
Here you go!