Jeanette Winterson (post 2) adds that various writers have written of their regular self as being another character; that is, just one of their multiple personalities.

“My first novel Oranges Are Not The Only Fruit uses a character called Jeanette…Henry Miller, Philip Roth, Paul Auster and Milan Kundera have all used themselves as their own aliases…Beckett” said, “this is me and not me, this is myself but it is someone else” (1).

1. Jeanette Winterson. “The malice and sexism behind the ‘unmasking’ of Elena Ferrante.” The Guardian, October 7, 2016. https://www.theguardian.com/books/2016/oct/07/unmasking-elena-ferrante