In the last game, Forgotten Land, Kirby fights against a god level dimension warping motherfucker who corrupted all the animals and steals souls for power. After being Kirb stomped, Fecto Elfilis creates a pocket dimension to escape to that contains all the souls and warped versions of the bosses. A pivotal part of the end boss build up is a wall of flesh/psychic material chases after you, the goopy mass swarming with the faces of those it’s consumed.
This isnt even lore yet - it’s gameplay. Kirby is also haunted by Meta Knight, space wizards from other dimensions, and so much more. It isn’t hype to just talk about what’s happening in the game.