Kirby/Fridge

Fridge Brilliance

 * Throughout several Kirby games, Kirby ends up doing things that ultimately wind up freeing or unleashing the Final Boss es. The reason? He has a case of Black and White Morality. In addition, when a player reaches that point for the first time, they usually only know about as much as Kirby himself does, and since Kirby sees what Dedede does as a bad thing, so does the player. And since the situation changes at times, Kirby's trusting nature and Genre Blindness prevents him from knowing what evil is hidden just out of sight.
 * Throughout the games, Kirby is known to live in a Sugar Bowl world, and the bosses he fights on a regular basis range from Sealed Evil In Cans to Eldritch Abominations. Why are Kirby bosses so nightmarish? Because Kirby lives in Dream Land! It makes sense that the bad guys would be the stuff of nightmares.
 * Although the Big Bads Zero and Zero Two look quite similar, there has been no Word of God telling us whether they are the same thing or not.
 * Apart from their obvious association with Dark Matter, and the fact that Zero Two has angelic features suggesting a previous Disney Death, it's just quick maths: 02 = 0. So yes, they are the same creature.
 * Worse, Zero Two is Zero squared. Even more Eldritch Abomination. Also, it is more heart-like shaped and not spherical. Makes sense, because it is the heart of Dark Matter.

Fridge Horror

 * The Kirby series is probably the archetypal Sugar Bowl, a perpetually happy place filled with bright colours and cheerful characters where nothing bad ever happens, the stories merely Excuse Plots for purposes of fun. Except that no, it isn't. Pop Star is constantly assailed by undefeatable Eldritch Abominations that corrupt and kill and bring the world to the brink of destruction. The closest thing to an authority figure is a bumbling Authority in Name Only that can barely succeed even in the few times he manages to be competent. The Only Sane Man is a Blood Knight concerned only with combat. And Kirby himself, the protagonist and supposed hero, eats people. Hundreds upon hundreds of people. He is a horrific scale Big Eater on par with the Tyranids, consuming indiscriminately all in his path, and there is nothing anyone can do to stop him.
 * Kirby eats enemies to gain their powers. Ritual cannibalism is carried out for the same purpose.