User blog comment:Parakeet Gaming/A theory on the origins of Herobrine and Entity 303/@comment-25014034-20170331090642

There is already an origin story- a user on Reddit began posting about strange occurrences on his world. Later a person on YouTube, taking inspiration, hosted a livestream in which a painting containing this beast, Herobrine was showcased. It went viral and Minecraft's greatest creepypasta was created.

Both the streamer and the Reddit user have admitted to falsifying Herobrine.