In my opinion Endermen are humans who went to the End, but because they couldn't defeat the Enderdragon they were unable to escape the End and we're trapped there for eternity. Therefore I think that when humans first entered the End they brought wolves as their companions to help them. They also brought cows, sheep and pigs with them for food and horses for transport. But just like Endermen those animals evolved over time into Ender Animals.
Ender Animals would be neutral, they would have teleportation abilities and they would drop food that would teleport you randomly kind of like chorus fruit.
Thanks to everyone who put their idea in the comments if I like the idea I might add it to the post.
Ender Wolf idea from Oliver Palmer.
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