Multiverses Origin

Marvel, Harry Potter, all those stories seem to be from the minds of their authors, yet, they all exist. The multiverse is vast, yet connected through stories, influenced by the creator. However, nothing can stand against time, time will claim all, and thus the ruler, was lost within the river of time. The beings, unleashed, creatures capable of destroying the multiverse, slowly being unsealed, and a new heir to the throne was needed. In one of the many universes in the multiverse, a young man was chosen.