Creeper that goes hunting humans.
Humans used to be created by pressing G while playing in Classic mode, but this function was later removed. They were spawnable using mods and map editors, but otherwise were not available in vanilla. When spawned, they would pursue and kill the player, dealing the same damage to the player as the player does with their fist. Strangely, they do not use the punching animation that a normal player would use; they only run into the player like a zombie would.
Humans could not create or delete blocks, they would just move around the map aimlessly, walking in slightly imperfect circles and jumping occasionally. While walking, they would flail their arms around and move their head randomly. Humans were affected by solid blocks, but strangely not liquids, walking through them as if they were air. If the player has a custom skin, any humans created will still use default skin and will not assume the look of the player.