I saw brightburn, I actually really liked it, but damn I did not see the ending twist coming
! they basically set up an evil justice league, kind of, some blogger talks about how there's more out there like him and mentions a scary half fish man and a woman with rope, so basically aquaman and Wonder Woman, interesting concept at least…. kind of reminds me of Dark Metal
I saw it too last night, damn, best horror flick I've seen since It Chapter One. The Gunn Family really nails the concept of an evil fledgling Superman. Totally worth a sequel especially if, going along with what you were saying,
! their universe has its own version of a Batman who sets out to kill him.