Darth Sidious

Darth Sidious (sometimes called Emperor Palpatine or Emperor Piglatine in-book) is King Pig as the secondary antagonist and appears in Angry Birds Star Wars and Angry Birds Star Wars II.

Angry Birds Star Wars
Darth Sidious appeared as the last boss. After hitting him with some birds, he'd be very injured and stunned. After that the player could play as Darth Vader, who's the only bird who could defeat Darth Sidious.

Angry Birds Star Wars Facebook
Darth Sidious only appeared in tournament levels as a hologram in the game. His power is to hit objects and enemies with chain lightning.

Angry Birds Star Wars II
In the second game, he becomes a playable character and is also seen more frequently. The electricity he shoots can conduct through Iron, usually destroying surrounding blocks hit with electricity.

Sidious wore a false beak while he was disguising as a bird and became the senator of Naboo then elected to become the chancellor of the Senate. The Jedi Birds and their fellow were totally unaware with Sidious' true identity as a ruthless, powerful Sith Lord.