Definately changed my personality because lucid dreaming makes me see things in a different way than before. I think exploring different aspects of your personality through dreaming is a fantastic idea. I have done quite a bit of regression, exploring things that really bother me about my past and really exploring it to find out why. (damn i sound like my own psychologist )

That's the best part - explore the really messed up feelings you have, the things that really bother you and see if you can get a different understanding of it.

good luck!