Merfolk

Merfolk are a race of Beastman native to the sea. Females are called Mermaids and Males are called Mermen.

Biology
Merfolk are a race specially adapted to living in the water. They can have inhuman hair and eye colour but human like complexions, often being fair or pale. Males have been shown with a half fish form, having the upper body of a man and the tail and ears of a fish, like in typical folklore, with their hands and arms matching the colour of their tail. Like all Beastmen, males also have a human form, which they use on land, as evidenced by Bluepool. It is unknown if Mermaids also have a half fish form, though they do possess a human one, as evidenced by Qin/Jean.

Merfolk are used to cool temperatures and tend to find the land hot and dry, on land they crave the hydration and coolness of water. Overtime they can adapt to the land as shown by Qin.

Culture
The Merfolk people are separated into various clans, Qin's clan has thousands of males and only one female (her), that the mermen rely on to continue their clan. Each clan is lead by a King, who ranks the different Mermen. The female or mermaid of the clan is often left in a cove and will be guarded by the King or other Mermen when she leaves it, encased in a bubble, for protection reasons as well as their young, as shown by Qin's clan.

Female Merfolk tend to be very polygamous as there are very few born and they are expected to breed with many, many males in their clan, if not perhaps all.

Female Merfolk are raised by Mermen, after the death of their mothers.

Both male and female Merfolk like to grow their hair out long.

Mermaids are considered to be the most beautiful of all the Beastmen species. Mermen are often very handsome too, and perhaps the most attractive of the Beastmen species too.

Notable Merfolk
Qin

King

Bluepool

Jin

Trivia
In folklore, unlike the series both male and female Merfolk have the upper body of a human and the tail of a fish, as well as sometimes webbed hands and gills too. In many folklore stories, Merfolk do not have the luxury of simply taking a human form, and transforming from mermaid to human whenever they want. In Hans Christian Anderson's The Little Mermaid, the only way possible for a Mermaid or Merman to become a human (as per their wish) would be by consulting the sea witch, who would give them a potion which would transform them into a human. This form would be permanent, unless with interference of the witch. According to Hans Christian Anderson's The Little Mermaid, Merfolk can live up to 300 years and when they die become sea foam, the race also do not possess a soul. The main character of The Little Mermaid, was turned into a wind spirit, after refusing to kill her human love interest, a prince, committing suicide and granted the opportunity of gaining a soul, by completing good deeds for 300 years.

Because of her great beauty, Bluepool mistook the human Bai Qingqing for a Mermaid more specifically Jean, claiming that land females are not as beautiful as her.