From Fiction

Metaphysical (also called spiritual) fictionkin, are fictionkin who believe that the source of their identity as fictionkin has a real and concrete metaphysical or supernatural explanation. Metaphysical fictionkin reject the idea that their identity is based in human psychological phenomena and embrace the belief that their identity is part of a magical or scientifically unknown circumstance, 

Metaphysical fictionkin are the originators of the term ‘fictionkin’. While the term fictionkin has grown over the years to also encompass people who believe their identity is a form of mental illness or other psychologically based phenomenon, the original fictionkin community was based around metaphysical belief in the multiverse and reincarnation.