we’ll effectively “clone” ourselves by training various AIs on our writing and data to create a generalized copilot-style product that can be used for anything. you ask it questions, bounce ideas, and it responds with something a) deeply personalized to you and b) what it thinks you might say. 

has anyone built 

There are people doing this to talk to deceased friends/partners.

Sometimes consider making a "self AI", so that if something happens to me, my daughter will have a way to know my perspective on various topics.

May be possible already, given a sufficient training corpus.

The ethical side is the hardest question here