Merpeople

A mermaid (if female) or merman (if male) is a semi-divine being that has the upper half of a human and the lower half of a marine animal, usually but not always a fish.

Southern Mesopotamian (Babylonian)
Origin= The Babylonian mertribe are a patriarchal society and consists entirely of mermen. The tribe lived predominately in the sea and would only come to land to procreate with human women. The tribe originally held the belief that only their sons could inherit their magic and join them in the sea. When their mate gave birth to a female, by law they would be forced to execute the child and their mate. The mermen who grew to love and care for their mates as well as their children would break the law and allow their family to live. However to keep their betrayal to their people from being discovered, they would be forced to return to the sea and leave their families forever. Eventually it was discovered that females could become mermaids.
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 * Shapeshifting: Babylonian merpeople have the power to transform back into their human form. Powerful mermen can take the form of any creature they choose.
 * Atmokinesis: Babylonian merpeople are able to manipulate meteorological conditions. Mermen can control the rain and create hurricanes.
 * Hydrokinesis: Babylonian merpeople have the ability to control the tides.

Northern Mesopotamian (Assyrian)
Origin= When she threw herself into the sea, she was transformed into a mermaid. However, the transformation was purely physical as she still retained her godhood. Only her divinity and transformation left a residue in the ocean and gave the water mystical properties. When a human woman with a broken or conflicted heart came into contact with the blessed water, they would be reborn as mermaids. Initially, Atargatis' blessing was limited to the Mediterranean Sea but over the millennia it has spread throughout all the Earth's seas.
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 * Shapeshifting (involuntarily): Assyrian merpeople are able to take human form but only if they're skin is not in contact with water. When they make direct contact with water, they are transformed back into mer form.
 * Invisibility:
 * Voice Manipulation: