SUIJIN
God of water
Suijin (水神, water god) is the Shinto god of water in Japanese mythology. The term Suijin refers to the heavenly and earthly manifestations of the benevolent Shinto divinity of water. It also refers to a wide variety of mythological and magical creatures found in lakes, ponds, springs, and wells.
Text from en.wikipedia.org/wiki/Suijin
Undefined
Water is a natural element that often appears in anime and interacts with the characters within the narrative. It sometimes holds the power to heal, as it symbolizes regeneration and life. Apart from that, it's always represented as water itself, and not as the explicit embodiment of a kami.
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Explicit reference