Herobrine

About
Herobrine is a myth in the game known as “Minecraft”. For years, people thought this one was real. Herobrine was, apparently, a character that looked exactly like Minecraft Steve and could kill anyone and anything with one swing. Legend said he would randomly appear in your game and exact this grisly yet sudden extermination of you for no apparent reason. The trouble is, Herobrine isn't, and never was, real. Basically, it's a community created legend, and there's no reference to him in the game at all – not in the source code, and there's no code that allows him to appear in an unmodded version of Minecraft. Herobrine is mostly believed to be a fake rumor.

If someone you know claims to have seen him, they're either lying or using a modded version of the game with a skin. This doesn't stop people making videos claiming he's real, though. There has been thousands of videos claiming to “see” Herobrine.

Appearance
It is rumored that he takes the form of the games primary character Steve, but with eerie white eyes.