I would love to play a shifter sometime.
My take on it would be that his personality was somewhat mutable...that is, if he spent a lot of time as a wolf, he'd start acting like a wolf. I had a 2e character with the Infiltrator kit that was a similar concept - they were elven spies so adept at their art, they sometimes lost track of their true persona.
This would appeal to the RP side of me. And of course, figuring out what forms are best for what tasks would appeal to the tactical side.