Olivia, the Mass Grave

Olivia is a strange creature indeed.

She stands at about 5' tall. Adorning her head is a skull of some creature's; perhaps that of a small dragon's, with four large horns protruding from it, two on top and two more to the sides of the head. The horns are carved with a spiral; the spiral, consisting of a line about an inch and a half thick, contains a set of swirling lines which seem to glow; the ones at the base of the horns glow brightest, and those at the top do not glow at all, tapering off entirely near the middle. Adorning these horns are various ribbons of white and gold. The vertebrae of this creature's skull emerge from the back of the helmet, and then reach into her neck, seemingly fusing into her body and then running all the way down until it re-emerges as a long tail made of bone. A golden nose ring is hooked into the nostrils of the skull, from which is draped another of the ribbons mentioned above.

Her body is made of a dark, murky substance; nothing is visible beneath, except for what seems to be the luminous imprint of her bones, which shimmer inside up to her neck. Her spine is that of the helmet's, with the rest of her body seeming to have relatively normal human bone structure. They are not brightly visible, only a faint outline under her inhumanly dark skin. Her body is tall and moderately slender, with a flat chest but noticeably feminine hips.

She has a face, although it is rarely seen under her helmet. It is humanoid, with sharp features; she has deep red lips hiding brutally sharp teeth, a pointy nose and no apparent eyes, as those would seem to be in the helmet itself, glowing a variety of solid colors depending on her 'state' (red for 'defensive', green for 'idle', white for 'alert/seeking'). She can remove the helmet (which detaches it from the vertebrae), more completely revealing ethereal, glowing white hair in a messy, curly short, fluffy bob cut reaching about her jawline.

Her arms and legs are plated with bone, unlike her torso. These plates stop at her shoulders and the tops of her thighs, and are not present on the soles of her feet or her palms. Over the tips of her fingers and toes are sharpened claws of bone. She wears no clothing, but in her normal state there is nothing to cover up; her body is mostly featureless but for its human shape.

Skull Reference: https://www.darkknightarmoury.com/images/Product/medium/CC11332.png but with an additional pair of horns rather than the fins at the back. It is only the top half of the skull.