The question how you are posing it is basically saying that one’s soul is the essence of who we are. The soul giving rise to the personalities we have, the way we encounter obstacles, our outlook and demeanor. And I guess while I could see that being true, that your soul could help to shape you into the person you are, I think there are also other factors that can shape a personality as well.
Examples of which could be the way in which your parents raised you, your schooling, your friends, all of those external factors that come at us and test who we are every day. There is also our environment; our entire makeup has been shaped by the environment in which we live. We have the ability to see, hear, touch, smell, taste, run, walk, jump, climb; all of those being skills that were fine-tuned over time to allow us to succeed as a body living in this environment. With our brain being the ultimate machine that ties all of that sensory knowledge together and allows us to process it, make sense of it, and ‘think’ about it.
Damage to that brain can have a huge impact on the person that we are. Likewise someone who goes through cancer, becomes paralyzed, suffers an emotional loss, all of things are going to have impact on the person you are because those are enormous tests to our physical well-being, and we are not just a soul, we are also a body. Your personality could be altered by your environment, could be changed, modified, but your soul isn’t going to go away because of those things. I guess the question at the end of the day is really who wins? The environment, or the soul? Which is stronger in shaping the other?