I had one, forever ago. I killed it. Then it got recreated by someone else without my permission being asked and things went downhill for various reasons, though I just left the "stolen" version be.
-bump-
I don't remember any major change in their personalities, and I only read the series the other week. At best, I got the impression that they could set aside their worst tendencies if it were really important - except the Thompson sisters were always strictly business in combat.