Shadow Bug
Shadow Bugs are the small, glowing violet spheres that the members of the Subspace Army are made of. They are apparently embodiments of a primordial substance. They are capable of copying a character's trophy and assuming his/her appearance. A copy of a character created by Shadow Bugs will have a purple tinge, be surrounded by a smoky shadow aura, and posess glowing yellow eyes. Shadow Bugs were created by extracting a mysterious substance from Mr. Game & Watch, leading Tabuu to have him captured to become the source of the Subspace Army's soldiers. It's hypothesized that Shadow Bugs create the props that Mr. Game & Watch use in all his attacks, unlike other characters who seem to pull objects from Hammerspace.
Trophy Description
Embodiments of a primordial substance that can take the form of any number of lesser Subspace foes. They can also copy the forms of trophies to create evil doppelganger versions of them. The mysterious substance inside Mr. Game & Watch can be extracted endlessly. Once Tabuu discovered this, he used Mr. Game & Watch to create the Subspace Army.