Umi nyōbō are dangerous yōkai who live in the ocean. They resemble human women but have many piscine features. Their skin is scaley like a fish, and their fingers and toes are webbed like a waterfowl’s and resemble fins. Their teeth are sharp and brilliant, like a shark’s. They are powerful and very dangerous. Umi nyōbō spend most of their time in the oceans. However, they can survive on land for several days without returning to sea.