Rusalka vs Samebito

Rusalka
In Slavic folklore, the rusalka (plural: rusalki; Cyrillic: русалка; Polish: rusałka) is a female entity, often malicious toward mankind and frequently associated with water. Folklorists have proposed a variety of origins for the entity, including that they may originally stem from Slavic paganism, where they may have been seen as benevolent spirits. Rusalki appear in a variety of media in modern popular culture, particularly in Slavic language-speaking countries, where they frequently resemble the concept of the mermaid.
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Samebito
The Samebito (鮫人, shark man) is a creature that appears in "The Gratitude of the Samebito", a short story by Lafcadio Hearn. It is described as a shark-like humanoid with inky black skin, emerald green eyes, a face like a demon's and a beard like a dragon's.