Kirby is canonically the strongest nintendo character able to send meteors thousands of light years away in a single hit as well as cracking a planet in half with a single punch. Kirby is able to completely absorb, not just eat, because his stomach is similar to an entirely different universe that stores his stolen power for later use in ravaging universes. Kirby is casually mentioned to have literal infinite power and his determination keeps his soul from passing on, so it stays with his indestructible body regardless of death. Kirby’s absorb in smash also gives him the ability to create space from nothing (exampled by swords materializing in smash or other titles) possibly from energy, however it is not a hinderance for kirby due to his canonically infinite power. Also with his ability to split in the first games he is able to let another player join by sacrificing a stolen power. This confirms that kirby is able to create life by dipping into his endless reservoir of power, potentially even creating more infinities or kirby’s due to the sheer abundance of power residing within the pink vessel of a god. Which means that even if you were able to banish the pink devil to hell it would already have some leftover energy left in that universe. With that leftover energy also having kirby’s infinite potential it could grow another kirby and the cycle repeats. Also trapping kirby is not a viable option because his ability to move through objects by moving with infinite speed would release him from any bind, and the reckless behavior would become enraged and fight (supported by when kirby killed a god for a slice of cake). “Poyo” is but an omen of death. A false sense of hospitality granted by the cruel god that is kirby.