The Nothing

The Nothing is an upcoming non-playable character, as well as the supposed main antagonist of MultiVersus.

Origin
The Nothing is an original character made specifically for MultiVersus. Very little is known about this character, as the information is limited, but we do get some ideas via Reindog's, Tom & Jerry's, and LeBron James' biographies from the official website.

The Nothing appears to be an omnipotent being who can travel across various Universes, stealing people and objects from wherever he goes. While his intentions are currently unknown, he's hinted at being a malevolent entity bent on the destruction of the entire Multiverse.

It is also implied that the various cameo objects seen on Trophy's E.D.G.E. have been gathered there by the Nothing itself, treating them as its own "trophies". This could also imply that the very existence of Trophy's E.D.G.E. (and Trophy's E.D.G.E. 2) has been caused by the Nothing.

Trivia

 * A popular theory among the MultiVersus community is that the Nothing could be the same character as the main antagonist of the 1979 German fantasy novel The NeverEnding Story and its 1984 movie adaptation made by Warner Bros., since, outside of the fact that both characters share the same name and hail from a WBD-owned property, both characters seem to share similar motives of destruction.
 * Nothing?.png's Gameplay Trailer.]]Some people theorize that the cosmos-like black blast zone that surrounds every Map could be interpreted as the Nothing itself, slowly consuming each fictional world due to humanity losing its passion in them, with Zanifeer being the first to be consumed likely because nobody had heard of it before.
 * Coincidentally, the character also shares the exact same name with an overarching antagonist from the 2017 battle royale video game Fortnite.