When the Earth was young, and many creatures that only appear in myths today roamed its surface, Graxel the Green was a part of the council of Wizards, serving to protect the Earth and its inhabitants. One day, Graxel was in the arctic, trying to take down five evil wizards at a time, and although he was a great dueler, he was no match for all five of them, and fell into the freezing water, unconcious. Part of the water froze almost immediately, preserving his left side, but his right side rotted away.
Centuries later, an antarctic research team went out to that very location and discovered half of a body in an iceberg, heart still beating. They took him to an expert surgeon, who replaced the missing half of his body with wires, metal, and many electronic parts. Now Graxel lives as a cyborg, half of him a powerful wizard, and the other half a living computer that speaks html as a second language.
Graxel soon realized that the world he tried to protect had fallen. The only race that remained was the human race, there were no Wizards or Elves or Dragons left. The multitude of forests he had left were replaced by shops, skyscapers, and apartment complexes. So many dead animals lined the sides of the roads. He was furious at humanity, but his power was weak. So he decided to get a new profession. Graxel used his computerized brain and was able to become a genius hacker. He started out demolishing websites, and then he discovered....
Minecraft. He first hacked Mojang to give him a thousand free accounts. He now hacks any server he can find, then destroys it. You can try and ban him before he comes on, but it may be too late. He could be on your server right now.