I'll go out on a limb here and openly say that I do believe in being not entirely human. It's a confusing theory, but in short: I believe that the expression of Being is both the soul and the shell. A ball filled with dirt and a ball filled with air: they are both still balls but they have different weights, masses, uses, and experiences/existences because of what is on the insides.
I do believe in other planes of existence and I believe that each plane contains its own array of beings/species. I believe that you can have the soul of some other being and incarnate in a human shell. Conversely, I also believe you can have a human soul and incarnate in a non-human shell. This is just my own theory and it is no more right or wrong than any other established theories. Overlapping this theory is my /other/ theory that the soul is specie-less and genderless, but that it becomes acclimated to incarnating in a certain form. But, I digress. This is a topic for another day, lol, forgive my tangent. *tucks her crazy back into her pocket*
Where this ties into roleplaying: I do not believe, for example, that if one has the soul of a wolf they are some tormented man-beast. When members are upset about the roleplaying on the site, it usually has to do with lack of knowledge about the being (as Ragnorok said), and (in my personal offense) complete ignorance of the limits of the physical plane. Only you know what you are inside, whether you are a toaster, a Klingon, a human, a vampire, whatever, BUT your body is physically human and thus you are bound by the physical plane when you choose to reside in it; such as when you are on this site.