This index defines one of the primary mythological bridge domains of Japanese folklore. It documents mythological and legendary figures whose origins lie in classical mythology, religious tradition, and ancient legend, yet whose narratives intersect with living folklore practices.
The figures collected here are not always classified strictly as yōkai, but persist through oral tradition, regional legend, ritual storytelling, and popular narrative cycles. They form the connective layer between religious myth, historical legend, and everyday folklore culture.
This domain functions as the mythological bridge pillar of Japanese folklore, linking ancient cosmology, legendary heroes, and ritual belief into the broader folkloric structure.