Kirby was widely considered to be the second worst character in Super Smash Bros Melee, being mistreated and humiliated by higher tiers way more than Bowser (the actual worst character) did, and by the time year 24 hit, he had enough. He was corrupted by the abuse and turned against everyone with the goal to kill everyone in the smash bros universe, and so far his plan is succeeding. Jigglypuff should've listened to Mario when he warned everyone, but now there's consequences.