""King Dedede (デデデ大王, Dedede Daiō) is a major recurring antagonist of the Kirby series. He is a jolly penguin-like monarch known to be fat and self-centered; furthermore, Dedede causes many problems for the inhabitants of Dream Land through selfish mischief, such as stealing Dream Land's food supplies for a midnight feast in Kirby's Dream Land, taking all of the stars from the sky, or merely just wanting revenge on Kirby. Despite this, he does care for Dream Land, and he works to protect it by destroying the Star Rod to keep Nightmare at bay in Kirby's Adventure and working with Kirby in Kirby 64: The Crystal Shards to stop the Dark Matter. He has many of the same abilities as Kirby himself does, such as being able to inhale objects and spit them back out with tremendous force, and the ability to suck in air and fly.

King Dedede makes a return in Kirby Super Star Ultra. There is a new mode called Revenge of the King, which is basically a harder version of the original Spring Breeze. For the final battle between himself and Kirby, he sports a mask and an improved version of his hammer. This new hammer features new attacks, such as shooting missiles, flames, or spinning extremely fast. In addition, the arena is now caged and electrified.

King Dedede was originally intended to be a playable character in Super Smash Bros., but was cut due to time constraints; he does, however, appear in the background in the Dream Land stage and as a trophy in Super Smash Bros. Melee and was finally added as a playable character in Super Smash Bros. Brawl, due to being one of the most requested characters to be playable in Japan, where his main weapon, the "Jet Hammer", is a mechanized version of his usual mallet.

In the anime series Kirby: Right Back at Ya!, King Dedede is presented as the supreme and incompetent ruler of Dream Land, with a castle atop a hill, overlooking Cappy Town. This version of the character is more rude and malicious, but ultimately ignored by the unimpressed populace. Dedede's main cause of inconvenience is his constant purchasing of monsters from Nightmare Enterprises to enforce his laws, create chaos, or to get rid of Kirby, whom he feels is a threat to his popularity and authority. King Dedede is voiced by Kenichi Ogata in the original Japanese version and Ted Lewis in the English dub. He is voiced by Masahiro Sakurai in Kirby 64: The Crystal Shards and Super Smash Bros. Brawl.""

Source: Wikipedia, "King_dedede", available under the CC-BY-SA License.