Is Herobrine Real?
No, Herobrine doesn't exist, despite the fact he was seen by other player and have evidence that he was real. Notch says he wasn't real. Something like this:
Herobrine isn't real. He was just one of the creepypastas that people made up.
Some say he was Notch's dead brother. But he has no brother. Neither did he have any other brothers. Of course, if Notch really did prove to add him, he would of got fired and he would lose all his money since he was a billionare. There is a Herobrine mod, but the sightings on the game without mods were different than the mods itself. Of course the Wiki says:
Herobrine is not in Minecraft.
There are no references to him at all in the source code, and there is no code to allow for any entity to act like Herobrine. There is no level terrain code to generate redstone torches, 2x2 tunnels or elaborate dungeons with traps.
There is no possible way Herobrine can ever exist in any unmodded clients or servers. Any claims that he is in Minecraft are completely false. Any appearances he may have are caused by mods being installed.
What does Notch say about Herobrine?
Notch tweeted:
Herobrine isn't real in any way, no. I never had a brother (well, there's a half brother I never meet..), and he's not in the game.
Getting loads of tweets and emails about Herobrine again. I don't have a dead brother, and he never was in the game. Not real. Never was.
The Herobrine stuff is awesome and kind of scary at the same time. It really shows how little control a content producer has over the content.
I've publicly told people there's never been any such thing as Herobrine, and that I don't have any dead brothers, and that letting too many animals die in lava is a fool proof way to summon him but that you don't need to be afraid of him. He only means well, he's looking out for you, trying to warn you of the dangers you can't see. There certainly are NO physical manifestations of Herobrine that will sneak out of your computer if you leave Minecraft running at night, looming over you as you sleep with his pale eyes inches away from your face, as he tries to shout at you to wake up. Sometimes you wake up with a jolt, and he's gone, and all that lingers is the memory and faint echo of his wordless screaming. Of course it was just a dream. There's no way a morally dubious ghost with a god complex could at any point decide to haunt the children who play my game "for their own good", as there is NO SUCH THING. etc etc
Also herobrine is not real please stop asking argh
So of course, we have no evidence that he is in the game and is Notch lying? Or did someone really put a joke? We don't know.
Also when ever some people tweet him about Herobrine, he says:
I have no plans of adding herobrine.
Updates
Most of updates that Minecraft had normally say:
This made people think Herobrine was in the game and that he was removed. However, that was a joke from Notch, just so he could get rid of the Herobrine Argument.