[Lawtan]

Prosthetics - if they have no legs, you can add a tail. http://www.seriouswonder.com/transhuman-mermaid/

(Honestly wonder what will happen with the growing of exotic prosthetics - some better than the human equivalent...may create a new section of body modification culture...I am not sure how disturbing that could be...)


...Or do you mean the Trisphee item?