Atleast during the seven seasons I've seen, there was not a mention of any Lantern. I don't count Earth-90s Flash remark about Diggle and the ring. Granted, the supernatural heroes tend to appear mostly on Flash (Elongated Man, Firestorm etc). But Green Arrow/Green Lantern once were a duo in comic books. It's quite a let down that we never got to see it in live action, even if would have been in a TV series. It didn't actually HAVE to be Hal Jordan. They could have gone the more mystical route with Alan Scott. I could see it working because they used both Constantine and Vixen for the mystical element. But thinking about it, maybe they picked Vixen over Alan Scott because she also get the power from a totem (instead of a ring). If I had been one of the creators on the arrowverse, I would have Alan Scott (or Hal Jordan) appear for a season, or atleast a couple of episodes. I wonder why they never thought about that. Did it ever cross their mind that they could do it? Sorry if there's already a thread for this topic.