Nixes are shapeshifters of the multiverse. They are invasive and some love to cause trouble. But most like to stay in one au and make a living. Their diet is mostly fish, but corrupted nixes will eat fallen souls. If one to were have horns. It would be a unicorn horn. And their fur can be many styles. Long, Short, curly, etc. Once they find a mate they are inseparable. So its a challenge finding the right mate to live with. They tend to have large lifespans. But some that are born with a deformity are short lived. Unless constantly watched and helped with.