otherkin n.pl. people who believe themselves to be, at least in part, something other than human. Also singular. (source: Double-Tongued Dictionary)
Further reading
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The bit about fae blood isn’t true. It’s a white wolf roleplaying term only. Vampyre’s can sip on fae blood in the real world all they want. Our blood (being a Vampyric Fae) is quite potent and magickal and won’t harm you at all. In fact it might even help you.
My Definition of Otherkin is: A non human soul who is reincarnated in a semi-human/mortal/mundane body
who through time and awakening that continues may forever alter their semi human body too become a total kin physical flesh body. The astral spirit is the kin soul after all. It is not hard too believe or experience that the more awakened a kin’s soul and mind is that it may in turn and in fact alter the physical host body too reflect that which is inside it.
I also believe that this is true immortality and the only form of it.
Except that not all Otherkin are reincarnated. Some see it as more a psychological/neurobiological thing, while others attribute it to genetics or physical anomalies, and still others view it as a magical or metaphorical phenomenon. (Or some combination of some/all of the above).