This is a requested character.
Weight: 1.0
Trigger + Appearance: meroune lorelei, monster girl, mermaid, scales, gills, webbed hands, pointy ears, head fins
Default Outfit: maid headdress, frills, black dress, waist apron, puffy short sleeves, bare shoulders, cleavage
Add pink hair and blue eyes if necessary. She'll likely have extra/fewer fingers when generating her webbed hands.
The results of your generations are dependent on the additional LoRAs, weights, and models you use, so it may not work or come out as consistent as my sample images.