Ganon

In the Ocarina of Time, with his last breath, Ganondorf turns into this form from the extreme power of his piece of the Triforce, he isn't really a pig, but a sacred beast that is supposed to hold legendary power, yet Ganondorf didn't have the chance to regain enough strength to take over the world. The ONLY way to destroy him is with the Master Sword, for without it, all hope would be lost.