DarkMatterVariations

"Dark Matter" does not necessarily refer to an individual, but rather any of a number of shadowy clouds. These clouds can reach the size of a planet from which they can break off of to wreak havoc on Pop Star or even envelope entire planets, as shown during their attack on Ripple Star. They appear to be a race capable of independent thought - Gooey is mentioned to be "made from the same stuff as Dark Matter", suggesting he is a docile individual who rebelled. This is confirmed in the Hoshi no Kirby 20th Anniversary Encyclopedia. Some generic enemies (such as Nidoo, Mariel and N-Z) also appear to be made out of Dark Matter, though not the entity's base form