Tengu

A tengu spirit, he has formidable supernatural powers and is a superb swordsman. He uses hos black wings to fly.

How to acquire?
It is by completing all six Tengu sealstones to unseal Tengu. Sealstones are acquired from stories of Chapter 4 or stealing from other ghost agents by battling them. Completing again the sealstones will acquire the Tengu Magatama.