Originally posted by CortSether
Since Shuma has appeared in others besides Marvel then I do not see why he wouldn't be able to. Of course, I don't think DC has any interest in writing Shuma-Gorath into their works.
Canon doesn't work that way. Clark Kent has appeared in Thor comic books, does that mean Clark Kent is also multiversal? Understand that Shuma-Gorath was borrowed from Howard but he's as different from the original as DC Frankenstein is from Mary Shelley's original monster.
Also multiversal means being able to affect (under your own power) multiple universes, not visiting them. If that were the case then Superboy Prime would also be multiversal, as would any character that's ever visited another universe.