Its not true people like making up things, at the old update if you look in the jar files or the game files you see no skin, no code of any think Herobrine or player like Notch or the Mojang team did not ever implement a mob called Herobrine..... ( Minecraft Wiki ) Says the subject of a community-made "creepy-pasta" (Creepy story). He is one of the major community icons of Minecraft. Herobrine has not been present in any version of Minecraft. "Canon" of Herobrine is widely regarded as the first image/story ever posted about Herobrine, as well as the Brocast stream. Anything posted after these two events are considered as fanmade adaptions/variations.
Its a monster that looks just like Steve but has glowing eyes. He is a glitch that is every rare, when you see him (which you wont) run. He was took off the PC and Xbox but is still on the PE. He can shoot lighting from his eyes and make bedrock fall from the sky. He is the best griefer of all time.