personality condition
multiplicity
https://en.wikipedia.org/wiki/Multiplicity_(psychology)
https://www.wikidata.org/wiki/Q6935011
The psychological phenomenon in which a body can display multiple distinct personas. This phenomenon can feature in identity disturbance, dissociative identity disorder, and other specified dissociative disorders, among other things. Some individuals describe their experience of multiplicity as a form of neurodiversity, rather than something that demands a diagnosis. In a body that contains multiple personas, a "system" may associate behavior with each persona and switch among them. Somebody who experiences multiplicity is described as a "multiple," while a person who does not experience is described as a "singlet".
plurality