Puzzling people, even if high-functioning, may have undiagnosed dissociative identity; i.e., multiple personality

It may be undiagnosed, because they have never been asked relevant questions or they chose to evade diagnosis to avoid stigma.

It may not be formally diagnosable if it does not cause them clinically significant distress or dysfunction; or may even, for some purposes, such as fiction writing, be an asset.

Please search “puzzling people” for further discussion.