1) Green Lantern (Alan Scott)
Hal Jordan’s Green Lantern is probably the big-time DC hero who fans want to see turn up in the Arrowverse the most. After all, we won’t be seeing him on the big screen until 2020 and the shows themselves keep hinting at his existence.
Sadly, we’re 99.9% sure that’s not going to happen. Instead, it might be fun for the Arrowverse to introduce Alan Scott, the original Green Lantern. Unlike later incarnations, he is not part of the Green Lantern Corps and is instead a lone Earth-bound vigilante who derives his powers from a magic ring.
Having a character entirely disconnected from the broader Green Lantern mythology could allow him to slip through onto TV. Plus, he’s yet another member of the Justice Society.
The New 52 version of Alan Scott is also gay, which would be a good thing to adapt, as well, as we all know that the Arrowverse could do with some more LGBT heroes.