Minecraft wiki entry for Human, associated text: Humans could not change 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 they were able to walk right through liquids, as if they were air. If the player had a custom skin, any humans created would still use the default skin and would not assume the look of the player. They would not notice dangers, and because of this they would sometimes jump into the void.