King Pig

The King Pig (also known as Pig King or just The King) is the main antagonist of the Angry Birds series of games, and serves as the leader of the Pigs. His grand scheme is using his minions to capture three unhatched eggs from the Birds so that they may satisfy their hunger. While he does succeed on most occasions, the Birds are able to destroy his army and retrieve the eggs, while seriously injuring the King. When he recovers, he once again swipes the Bird's eggs using a different method each time. In some cases, he will distract the Birds with a cardboard cutout of himself (in Mighty Hoax), or enslave multiple Birds, as he does with the Green Boomerang Birds in Danger Above and almost the entire Bird tribe in The Big Setup in order to prevent his schemes from being foiled, but in the end, all the Birds end up succeeding. He then tries stealing them yet again in Ham Em' High, where he gets defeated by the birds again. Afterwards, he and the rest of the pigs dig an underground tunnel to snatch the eggs in Mine and Dine.

Google Chrome
In the Google Chrome version the king appears sitting on a couch with a donut with strawberry icing on top of it.

Trivia

 * As there is only one King Pig in the entire game, it's the most rare variety of Pigs seen, and when it does appear, no more than one King Pig will ever appear in the same stage together. The only exception is Golden Egg Level 13, which features four King Pigs, but isn't considered part of the official Angry Birds canon due to the stage being a bonus level.
 * For some reason, the Hoax King Pig can still move, even though cardboard can't move by itself.
 * However the King Pig may have designed it like that to heighten the illusion that it was real.
 * The King Pig is the only pig to have two ears on on side, rather than on either side of its head.