A while back, qwertyo asked about other sentient species in Kitsucorn Land. I didn't really have any plans but! My roommate! Caught on fire???? About this and started talking really excitedly about maybe other takes on mythical creatures and/or combinations of them.
One of her suggestions was a sort've deer hippocampus! I'm not particularly practiced w/fish but it sounds pretty neat to me. I've also kind of though of adding a centaur element to that b/c the idea of when it's on land trying to traverse with two sets of "front" limbs to get over ground and transport it's fish body sounds really neat and creepy-looking to me.
Also, harpies with vaguely dog or fox elements. Weird kinda-dog feet and maybe a tail that has both fluff and feather parts? I really am having a hard time deciding whether to go for human, bird, or puppy type faces for them.