Heroes In Their Own Minds: Worldbuilding

Okay, found the perfect title for this RPGfic I have in mind. I'd had in mind soliciting superhero suggestions but it occurred to me that I should lay out the world first.

As I alluded to in my previous post, I wanted to tap into the Marvel X-men vibe rather than the DC 'oh hey, we have random superheroes running around the world with all kinds of different origin stories, boy, our universe is such a mess that we need to have multiple Earths to explain them all.' So, think 'mutants vs humans.'

( Cut for length! )