Merfolk

Merpeople are supernatural beings who are half human and half fish. These beings can assume human form or the so-called 'mermaid/merman' form, the upper body of a human and the lower body of a fish. They have some control over the elements, especially water. When in touch with water, their human form becomes more unstable than the dual form, often leading to unintentional transformations.

People cannot be transformed into a mermaid by any means, but needs to be born with that ability.

Description
A merperson's tail is long, bright, with a translucent fin and its colour can range from a wide range. Merpeople's hair is typically blond and their eyes ocean blue.