i stumbled across this: Yōkai Daizukai, which is an illustrated guide to yokai(demon/spirit/monster) by shigeru mizuki. it's all cutaway diagrams explainging the anatomy of 85 monsters out of japanese folklore.
"The Doro-ta-bō (“muddy rice field man”), a monster found in muddy rice fields, is said to be the restless spirit of a hard-working farmer whose lazy son sold his land after he died. The monster is often heard yelling, “Give me back my rice field!” Anatomical features include a gelatinous lower body that merges into the earth, a ‘mud sac’ that draws nourishment from the soil, lungs that allow the creature to breathe when buried, and an organ that converts the Doro-ta-bō’s resentment into energy that heats up his muddy spit. One eyeball remains hidden under the skin until the monster encounters the owner of the rice field, at which time the eye emerges and emits a strange, disorienting light."
"The Kijimunaa is a playful forest sprite inhabiting the tops of Okinawan banyan trees. Anatomical features include eye sockets equipped with ball bearings that enable the eyeballs to spin freely, strong teeth for devouring crabs and ripping out the eyeballs of fish (a favorite snack), a coat of fur made from tree fibers, and a nervous system adapted for carrying out pranks. The Kijimunaa’s brain contains vivid memories of being captured by an octopus — the only thing it fears and hates."
you can check out more here.