I don't know that we saw enough of the Green Lantern to know who he was; I'm pretty sure he was not human. I don't see anyone listed in the credits (so the Lantern was probably entirely CGI), so that's no help either. I suspect it was just a nameless Lantern from thousands of years ago.
The other powered characters in that scene were the various "old gods". At least three of them are credited. Besides Zeus, we also see Ares (same actor as Wonder Woman) and Artemis (who is probably the bow wielder you're thinking of, if I had to guess.) In the DC universe, there are a dozen or so Olympian gods, all of which would likely have been present.
I will point out that Steppenwolf uses the phrase "old gods" to describe Wonder Woman's heritage, but in a way that's generally not the same as it's used in the DC comics universe. Zeus, Ares, etc. in the comics are the gods of Olympus, and would be classified as "New Gods" in the same vein as Darkseid. Steppenwolf appears to use the term just to describe the gods of the old world, not referring to the beings actually called the "Old Gods".