<Snipped quote by Techspert>
Alright. Another question though. Would Fenris be considered a part of MRs existence or an Outsider since his race came into being after the Box/Totality/Omnisphere?
Existence is just the name for what you might call the Omniverse, just everything that exists, the collection of every possible dimension to ever be conceived (including everything from Marvel's multiverse to our Earth to One Piece's planet, etc.). The Outsiders also came into being in Existence, but due to unique physical traits, shifted their society Outside. So regardless of "when" something originated, chances are that it came into being within Existence.