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Gangi-kozō (がんぎこぞう) is a yōkai who appeared in the 80s, 90s and 2007 anime versions of "Gegege no Kitaro".
Gangi-kozō's appearance is similar with Sara-Kozō, only difference is that Gangi-kozō has black hair and doesn't have a plate on his head.
Gangi-kozō is a harmless, fish-eating water monster in relation with the well-known kappas. Gangi-kozō occasionally encounter fishermen along the rivers they inhabit. When meeting one, the fishermen would often leave their largest, cheapest fish on the riverside as an offering.