You wanna know what was use to Justify crossovers with XIII and Gilgamesh's appearance. Something that goes by the title of "The Void". With that said I want to know if there is a limit in place on what that multiverse can contain. For all we know such a multiverse would involve things like Yo-Kai Watch....
Or for all we know, Nylarthotep decided to induce a mass hallucination forcing us to percive toy-like cats, dogs and ghosts, and made them all fall into the Uncanny Valley to further torment us. No these toys are not toys, they are marks of those who lost their minds to Eldritch beings, slowly losing their grip on sanity, an no one can help because they think they are just weirdos playing with toys
