As for multiple personalities, Išve decide to proceed on the belief that this is a psychotic disorder.
Dear Andrew and Jansy,
I can't see that it matters, but I was surprised to find that one of the doctors who treated Chris Sizemore (the subject of The Three Faces of Eve) refers to her problem as a neurosis: "Chris experienced a hysterical neurosis, dissociative reaction, multiple personality type" to quote W. Scott Gehman, Jr., Ph. D. from his foreword to the book I am Eve by C. C. Sizemore (1976).
Another reference to hysteria may (?) help regarding Freud: "Dissociate hysterical amnesia, the blotting out of important, sometimes traumatic experiences, is a pre-condition of both fugue states and multiple personalities."
Perhaps Shade would then be classified as neurotic and Kinbote as psychotic?
Carolyn