as someone mentioned earlier, while basic personality traits might still be present, it really is the chain of everything that's happening in your life that shapes who you become and how you behave. You shape the way you talk after your idols, you make your decisions based on your upbringing, your fundamental personality traits come primarily from your environment.
If that's ALL gone then you're a blank slate again, likely need to re-learn how to speak as well., thought basic motor functions may remain just fine