Herobrine is a game creepypasta about a being identical to Minecraft’s default character "Steve" but with blank, pupil-less white eyes. It began in an anonymous post on 4chan’s /v/ board in 2010 and spread through stories of a figure watching solo players from afar, building mysterious structures, and leaving traces. It has never actually existed in the game.
The heart of the horror is an intruder that resembles you. A being identical to your own avatar but for its empty eyes pushes an alien threat through the most familiar of forms. The developer Mojang repeatedly slipped "Removed Herobrine" into its patch notes as a joke, producing the curious spectacle of a never-implemented legend etched even into official documentation.