Although to turn my earlier response on its head, if the number of parallel universes is uncountable infinity, then you get into a strange phenomenon: Most if not all superheroes would exist, not because they are "superheroes", but because the chance is just in their favor in that precise universe. Superman isn't super-strong, but it just happens that every steel-bar he needs to bend was pre-weakened by random rust, he can't fly but a freak tornado throws him where he needs to be without injuring anyone in such a way it looks like he's flying. Of course, several theories reject the infinite universes hypothesis; there's just many, but not infinite.
https://phys.org/news/2009-10-physicists-parallel-universes.html
"By analyzing the mechanism (called "slow roll inflation") that initially generated the quantum fluctuations, the scientists could estimate the number of resulting universes at 10^10^10^7 (a number which is dependent on the model they used). However, this number is limited by other factors, specifically by the limits of the human brain. Since the total amount of information that one individual can absorb in a lifetime is about 10^16 bits, which is equivalent to 10^10^16 configurations, this means that a human brain couldn't distinguish more than 10^10^16 universes." (To be fair, that one is seemingly quite weird result. And if the number of universes is larger or equal to the amount of information our brain can process, doesn't that still mean that every *imaginable* universe is out there? Either way, it's pretty theoretical (in the "unproven gibberish" sense), so I guess dream away!;)
