This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Enko (Japanese)
In Shikoku, it is said that enko only live in the rivers in the summer. In the winter they migrate en masse into the mountains and transform into shibaten. Then, in the summer, all of the shibaten return to the rivers and transform back into enko. Enko, sea nymphs or sprites reportedly found in the Seto Inland Sea coasts will waylay unsuspecting humans and drag them down into the depths of the sea.
They resemble monkeys or hairy kappa. They are about the size of a three year old child, with bright red faces. Their long limbs are flexible and elastic, and if you pull on one arm it will stretch while the other arm shrinks. Their fingers are tipped with sharp claws. They are covered in thick fur, but are slimy and slippery like catfish. They have a dish-like depression on the top of their heads.