Mermaid
In folklore, a mermaid is an aquatic creature with the head and upper body of a female human and the tail of a fish. Mermaids appear in the folklore of many cultures worldwide, including the Near East, Europe, Asia, and Africa. The male equivalent of the mermaid is the merman, also a familiar figure in folklore and heraldry. Although traditions about and sightings of mermen are less common than those of mermaids, they are generally assumed to co-exist with their female counterparts. The male and the female collectively are sometimes referred to as merfolk or merpeople. This all holds generally true in reality as well. However, mermaids are not the beautiful, loving creatures that folklore would have one believe; rather, mermaids are huntresses of the sea, always looking for a meal.
Mermaids are predatory and have keen senses of smells. Their songs that they sing have two purposes. One is that it travels at frequencies allowing other mermaids to hear and communicate across miles of distance in order to better corner and isolate their meal. The other is the hypnotic power that it holds over humans that hear their song. Akin to the call of sirens, mermaids can lure people into the water and then they feast on their flesh. They work like sharks and can devour a human in minutes. As with most monsters, they try to keep a low profile to ensure survival in a world where technology could lead to their bane, so their main food sources are in the sea itself. They have a matriarchal society and mermen defer to mermaids in all things. They also have what is called the “mermaid’s kiss”. In essence, when a mermaid kisses a human female, she can infect them with magic, turning that woman into one of their own.