When you work with a classic Oz character, do you create a back story for them that you might not refer to that helps you keep in mind how you interpret that character?
I do sometimes when Baum didn't give us enough to go on. One example is the Cowardly Lion. I'm not exactly sure if I want to keep this back story, but it does make a nice character arc that is finished in The Wonderful Wizard of Oz.
The Lion was born in a Quadling Forest, but when he was young, just before he could be taught the ways of a lion, his parents were killed by a giant spider, and he fled to the Munchkin Forest, far from the spider's reach. There, he grew up in fear, without the knowledge of how to hold his own against other animals. (However, he guessed nearly right by trying to scare them with his roaring.) And then one day, he attempted to leap out and scare some travelers who were going by the road of yellow brick, but we know what happened next.
In my opinion, it makes more sense than, say, he rode in on a balloon from Omaha...