Arrow Season 7: 7 Theories For Who The New Green Arrow Is
7. Earth-? Oliver Queen
While we've learned the fates of a couple of different Oliver Queens, with Earth-2's being dead and Earth-X's being a Nazi, there are still a number of others out there in the multiverse.
It stands to reason, then, that there's more than one version of Oliver Queen who serves as the Green Arrow of his Star City, and we've seen characters crossover from other Earths multiple times before now. Even one of Arrow's main characters, Laurel Lance, comes from a different Earth, so there's certainly precedent for it.
The issue with this is that there's not seemingly any reason for someone to come over from another world, but with this year's Arrowverse crossover being Elseworlds, the multiverse is opening right up again, so this could be sowing the seeds before then.