i think creepers are endermen because creepers spawn in the grass where the water is below and endermen die from water and the end is below water. i hope that this has been inspirational to you all.
Have you ever wondered where Endermen come from. I thought that too, but the conclusion I came to was, that the endermen actually used to be the ancient builders but when the ancient builders who are the ones that killed off most of the ender dragons died then they turned to endermen and I think that is why endermen building things and pick up blocks. Who agrees?