Herobrine is 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 Brocraft stream. Anything posted after these two events are considered as fanmade adaptions/variations.Herobrine is Notch's dead brother, somehow embedded into Minecraft. While this is the "canon", this is also completely false in reality, as Notch has no brother.
Ghost aside, there are two plausible canon theories remaining.
Herobrine shows a lot of characteristics of being a form of virus, such as manipulating game worlds, deleting threads and sending messages through the Minecraft Forums. Perhaps also hacking into Notch's email and Twitter to reply on his own existence
heres a pic of him
~OldCPHelper

He is kinda scary.

I do not think he is scary at first I did but now no not at all if i see him i will say in the chat hi herobrine yeah hi so u guys can be scared but me no

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He is kinda scary.

ik look at his eyes