Mermaid

A mermaid (masculine: merman) is a supernatural specimen that inhabit the seas of Teyvat.
They are the creatures of the Light Realm belong with Dragons and are the historical and mythical figures of the old world. The race of the mermaids were led by the Sovereign of the Mermaids, Melania. However, they were defeated by the reborn Electro Dragon Raiden Shogun during the ancient times due to abyssal corruption.
== Overview ==
Mermaids are allegedly referred as a human with a tail of a fish. In history, there were several types of mermaids:
=== Elemental Mermaids ===
Elemental Mermaids have different colors of their fins based on their element, like any other lifeforms in Teyvat, they manipulate their element. Known elemental mermaids are:
* Melania
* Sangonomiya Kokomi 
=== Draconic Mermaids ===
Draconic Mermaids are a hybrid specimens of a mermaid and a dragon, unlike original mermaids, their lower body resembles a dragon's tail. In a overview of their characteristics, they have horns, pointed ears and nails, a draconic mermaid can also have their true dragon form. 
== History ==
Before, the mermaids and dragons live in a peaceful way until the Heavenly Principles attacked the whole Seven Sovereigns, leaving the mermaids terrorized and started going on a war with the denizen of the human world. Ever since the ancient times of humanity, mermaids and dragons were often come into a conflict with the humans and deities. And by extension Melania.
According to the thesis of the Raiden Shogun, mermaids were once trapped into the Abyss, however, they were able to return without a reason. The majority of the mermaids doesn't count on other species such as Youkai and Illuminated Beasts. 
=== Present Day ===
In Chapter II, Sangonomiya Kokomi is one of the active mermaids in the new world, however, the Vision Hunt Decree led her into a rebellion against the Electro Sovereign.