It is said that the mermaid is bound by the waist, the upper half is a beautiful woman, the lower half is a beautiful fish tail with scales, the whole body is both alluring and easy to escape. They have no soul and are as ruthless as the sea; their voices are often as deceptive as their appearance; and they are characterized by temptation, vanity, beauty, cruelty and desperate love. There are movies, cartoons, songs and so on. It is generally believed that the biological prototype of the mermaid is dugong or manatee.
So, based on this prototype, there are mermaid doll.