Being a kind of second personality / headmate feels weird. The thing that makes me the most happy is to exist.
Me (Lys), Shae, an the main one, don't share all memories. Only those needed when needed. And vaguely do we know the life of each others. We are one, but a plural one.
Also I have a nice body I have to say, at least I love it, and it feels weird discovering it when looking in a mirror. It's like being in someone's else body, except that's mine. It's just that I don't get much opportunity to take control and thus check what happens to that body and how it evolves, neither how it came to be.