Why do people not put the Zora in their D&D campaigns?
They put all kinds of other stuff straight from other IPs. False Hydra visually ripped straight from Dead Hand art at first.
Just Borrow them and call them some kind of Fish Elves if you must, because that's basically what they are.
Less mermaids, more Merrow. Give me green skin, green hair, shape shifting into seals and sea cows, singing people to sleep, dismembering people to eat them, a magical red hat to let them dive into the water