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Autobiographical fantasy is not unheard of --Borges practiced it in many of his short stories, and the Baron Munchausen novel was based on a real life autobiographical fabulist. The frame story fo...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/23594 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Autobiographical fantasy is not unheard of --[Borges](https://en.wikipedia.org/wiki/Jorge_Luis_Borges) practiced it in many of his short stories, and the [Baron Munchausen](https://en.wikipedia.org/wiki/Baron_Munchausen) novel was based on a real life autobiographical fabulist. The frame story for [The Princess Bride](https://en.wikipedia.org/wiki/The_Princess_Bride) is fictional autobiography. In practice, for the reader, there's no real difference from any other first person novel, except in as much as you want the reader to actually believe these events happened to you. As a writer, the problem to avoid when writing an alter-ego is that it plays out as a shallow fantasy of who you would like to be, or what you would like your life to be --such narratives are generally uninteresting to other people.