I got Behemoth Physiology. Which is actually pretty cool. This bit made me lawl, though.
Known Users
Behemoth (Judeo-Christian Mythology)
Behemoth (Final Fantasy series)
Behemoth (Heartless) (Kingdom Hearts series)
Vincent Valentine (Final Fantasy VII; via Galian Beast form)
Azul the Cerulean (Final Fantasy; via Arch Azul form)
Behemoth/Behe (Princess Lucia)
Groudon (Pokemon)