Otherkin

Otherkin are a subculture of people who identify as partially or entirely nonhuman. Some otherkin believe their identity derives from spiritual phenomena (such as posessing a nonhuman soul, reincarnation, or the will of God), ancestry, symbolism, or metaphor. Others attribute it to unusual psychology or neurodiversity and do not hold spiritual beliefs on the subject.
The otherkin subculture grew out of online communities for people identifying as elves in the early-to-mid-1990s. The word has since come to be treated as an umbrella term for a number of nonhuman identity subcultures which developed around the same time.