[view] • [talk]"Steve" was the name of one variant of the now disused human mobs. They were originally in-game as a test during the Indev phase. At that point, it had been stated that the skin of the player would look like Steve in the future, albeit with a miner hat and a different skin.
Steve was made by "Dock", Minecraft's past artist along with the similar looking Rana, Black Steve, and Beast Boy mobs. All four of them were scrapped when Dock left the development team in early 2010. The player model remains the same as the now removed Human NPC.