>>27288503King Dedede has been a "final" boss a number of times but only because there was a greater, eldritch horror hiding behind him. Half of the times he's just straight up possessed and other times he's trying to do his best to impede Kirby because he doesn't want the pink blob to be the hero of HIS Kingdom, but then he realizes that Kirby's fucking broken and now works together with him. After beating the shit out of him. The same thing with Meta Knight who started out as bad guy but now just wants to fight Kirby for the thrill of battle. They're all friends that like to beat the shit out of each other.