When characters exist their realities and enter Anti-Space, they are turned into toys or trophies and cannot move. Characters do not need to enter Anti-Space all the way; they can still process thinking and consciousness. A being called Irregular exists in this realm as objects not meant to be normally seen; it is depicted as wild, uncontrollable energy.
Interactions between Anti-Space and Postive-Space cannot be normally seen unless more universes cross over. At some point, the number of universes crossing triggers visibility of tampering. Characters being tampered in Anti-Space have no will of their own although they appear to do.
It is one of the few universes that cannot be returned from if entered; tampering with a character in Anti-Space must return to the universe they were originally from.