There are many vastly different races inhabiting Aerth, both natural and not. Metamorphs are, probably, its most bizarre denizens, obviously descended from a lifeforms vastly different from any other. Their biochemistry incompatible with aerthian, they need to protect themselves by creating a layers of simulacrum flesh on top of their amorphous semi-liquid body. Essentially, they take on appearance of different creatures inhabiting Aerth, changing from one form to another as they see fit, morphing their consciousness as well, leaving only a bare fraction of their self active to blend better with the world. Metamorphs hold history both as strange whimsical creatures and, in rare cases, bloodthirsty monsters - depending on the change path and rare inherent flaw, some metamorphs may lose capacity for thought process and live their remaining days to devour and change in endless cycle.
Ziel is highly unique even among metamorphs. Due to some innate disability or powerful mental imprint early in the change path, [gender presumed] she can't assume any form other than that of a slim female bird-like humanoid. She compensates somewhat by being highly proficient in maintaining it. Inside of Ziel's body, instead of amorphous substance that all metamorphs should consist of, lie perfect copies of all organs and fluids normal for a warm-blooded humanoid race. This does not preclude highly acidic blood or spontaneous changes in biochemistry, however - not only Ziel can, she happily does alter the composition of her insides.
Ziel and Aerth belong to
Adopted from FA user a-n-c-h-o-r-e-d