The
evil villan of the
Kirby series of games. Though I'm not familiar with the
plotline of the original game, I do know that Dedede was actually trying to do
Dream Land a good thing in
Kirby's Adventure.
Dedede is more or less a blue penguin who wears a Santa Claus-like outfit, has abilities similar to Kirby's, and has the added benefit of having a mallet with him all the time.