Pandamaru (https://www.deviantart.com/schwarzenacht) has the original template. I've been working on some more custom variety poses and stuff based on Pandamaru's mermaid template, but most would need to be put together on a spritesheet, though there are some already preset. They are located on my website udner download>Materials and include the mermaids I've posted in my workshop. http://www.lunarberrystudio.com
Gonna update my descriptions in the other downloads with this info just incase other folks want to know ^^;

Is there a way to get the the template itself? I wanted to make my own but doing a edit from this would require many changes