Last summer, I took an online course (LOVE them for flexibility) about building characters at KidLit Summer School from the nerdy chicks at KidLit Writing School. It was awesome. The blog posts, tasks, webinars, and guest bloggers were very helpful in creating new ways to think about character more deeply.
Sudipta Bardhan-Quallen is now preparing to run an in-depth course: Character Building in Picture Books. If you've ever thought about writing for children, this would be a great course to take. Sudipta has 18 picture books either in print or scheduled (Tyrannosaurus Wrecks, Hampire, Duck, Duck, Moose, to name a few) and is very personable and helpful.
Get over to KidLit Writing School quick and register! Classes begin January 26.