Articulated Mermaid. Print in Place. Works fine even with 0,2 mm layers but preferably of course with 0,1mm layer height, depending on the size you want it (I like Mixi to be 7-8cm tall, you can do 6cm). No supports required.
V2.1: fixed crease around the head. Improved Tail.
with loop: for those who want to have it on a keyring (not sure if it will survive long though), pendant....
Why Mixi? Maybe you want to give her a mouth (I like her without) or a different hairdo?
or buy from https://www.etsy.com/de/listing/716747049/mixi-the-mermaid-of-kiel?ref=listing_published_alert
DISCLAIMER: This is, of course, not a toy!