I crafted a theory on multiple personalities shortly after my awakening. I can't say for sure it's my theory alone but googling it I didn't find any others like it. The closest I found was that the modern-day philosopher Ian Hacking has written a book called Rewriting the Soul, Multiple Personality and the Science of Memory. I never did get a chance to read the book to see if it correlated with my theory, which is, in a nutshell: the fully formed alternate personalities that emerge are actual personalities of human beings that the soul had previously incarnated. When the current identity is so damaged or threatened, the soul allows prior personalities to emerge to protect the life of the current host.