There's a lot of base-line people, but hundreds of heroes with special powers. Used to be tens of millions of people like me, mutants. Basically we have an extra gene that either grants us abilities or makes us not look human. Or both. Until most of us lost our powers. An entire species wiped out in the space of three words.
Most worlds don't seem to have the revolving door. We're just lucky. Though it's not always lucky.
I died once only to be resurrected, and before that I went through something that I'd wished had killed me.