King Dedede is the self-proclaimed king of Dream Land, Kirby's #1 rival, and a recurring antagonist in the Kirby games. Typically caring only for himself, he likes to mess with others because he thinks it's fun. He even once stole all of Dream Land's food. However, Dedede isn't all bad - he's just more of a bully who pulls pranks on others just for the fun of it. Sometimes, he does do good deeds, and will even team up with Kirby more often than he'd like to admit.
In the anime, Dedede also pulls pranks on others and especially tries to make other people's lives as miserable as he can because he thinks it's fun. He buys monsters called Demon Beasts created by the Holy Nightmare Company, led by Nightmare, to help him with his desires, and has a snail sidekick called Escargon.