Sese Kitsugai, the gashadokuro from the Len'en game series.
Couldn't get her black skeletal arm working but otherwise pretty good. You can try the tag "bone" if you want to test your luck with more than her back bones.
Trigger Word:
SeseKitsugai
Reinforcement Tags
1girl, solo, green hair, short hair, green eyes, skull hat
Clothes
white puffy shorts, japanese clothes, hakama, brown detached sleeves, slippers