A replica of what? Of your words? Your thoughts? How would it access those thoughts? What about your feelings? What about the things that actually go on in your physical body outside the brain?
I don't know what the results of combining all that data with an LLM will look like, but I think recording our experience to be used by an AI will only get better.
Also, sensors like HRMs or activity monitors could give it insights into your emotional state.
It could replicate your reactions.