Shark idea

I heard you guys won't add realistic predators like sharks or crocodile/alligators however what if you took an idea using a variations of them like nether sharks lava sharks wither sharks that live in the nether and drowned sharks or husk sharks same for crocodiles and alligators same idea drowned alligator husk crocodile... different biomes slightly altered looks. Or starfish sunken pirate ships have undead skeletons wearing pirate clothes