Therians and Otherkin are indeed humans. We are just humans with the belief that we are not entirely human. We are spiritually, emotionally, or logically connected to a certain earthly/unearthly creature; and yes, one may even have more than one theriotype.
Despite Hollywood makes of the Were, we are NOT monsters.
Because we are humans. Functioning and surviving like so, but with different personality traits and behavior, to that of one's theriotype.
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UPDATES IN PROGRESS