Have you seen the film Gone with the Wind?
I have but it has been many years. It's a classic, epic historical romance from 1939!
I have not seen it. I have heard it has some Confederate bias. Is that true? I have relatives that fought for the Confederacy so it likely will not bother me.
I am not really sure about bias exactly. It was set in the American South during the Civil War. Scarlett O'Hara is the main character, the daughter of a plantation owner.
What kind of personality does Scarlett O'Hara have?
Scarlett is very strong-willed and spoiled, at least at the beginning. 
I imagine she changes throughout the film. Would you say it is for the better or for the worse?
She changes for the better, for sure. She has to claw her way out of poverty during and after the Civil War, after being a super spoiled girl.