Water Genasi

Water genasi descend from marids, aquatic genies from the Elemental Plane of Water. Water genasi are perfectly suited to life underwater and carry the power of the waves inside themselves.
Their skin is often shades of blue or green, sometimes a blend of the two. If they have a human skin tone, there is a glistening texture that catches the light, like water droplets or nearly invisible fish scales. Their hair can resemble seaweed, waving as if in a current, or it can even be like water itself.

Genasi

Tracing their ancestry to the genies of the Elemental Planes, each genasi can tap into the power of one of the elements. Air, earth, fire, and water—these are the four pillars of the Material Plane and the four types of genasi. Some genasi are direct descendants of a genie, while others were born to non-genasi parents who lived near a place suffused by a genie’s magic.
A typical genasi has a life span of 120 years.

-description courtesy D&D Sourcebooks/D&D Beyond