This is an idea I've had for a while of an alternate, post-apocalyptic universe and how DC characters would fit in there.
Mm, yeah, so I couldn't pick which Green Lantern to stick in this universe and so chose all of them (well... the Earth ones.) I lean towards John Stewart and Guy Gardner being my favorites right now, but the others are too close as well. I was actually really conflicted about this because I wanted a dark scene for this one and yet the wonderful thing about the Green Lantern series is that where, no matter if you're reading DC or Marvel or Dark Horse or whatever, everything but this series is in a really dark, gritty style. Green Lantern's just like this wonderful explosion of color, but that doesn't really fit into this universe that I can tell yet. Anyway.
Although the Green Lantern Gang has the ability to fly or create vehicles with their rings, it costs an enormous amount of energy and so, like many post-apocalyptic travelers, choose to ride on the mutated steeds of their time.
Hal Jordan (on the two-headed mule,) Guy Gardner (on the boar,) and John Stewart (on the big horse) formed a small roving gang even before discovering their rings. Hal Jordan is indisputably the leader, although he occasionally faces challenges from Guy. Hal was born in a human settlement that lived in an abandoned aircraft field, hence his pilot's jacket. Not content to stay, he set out into the desert but soon found himself at the mercy of a band of raiders. Although he fought valiantly, he was overcome until a rescue came in the form of John Stewart.
John was a former soldier of an upstart government forming in the east under President Amanda Waller. He had left the military a few weeks prior, around the same time a city of mutated humans was wiped out, rumored to be done by Waller's military. He refuses to talk about his time there.
Together, John and Hal were able to defeat the raiders and decided to form a team bent on taking out these amoral types of gangs. They were soon joined by an unlikely ally, Guy Gardner. A former raider himself, John and Hal were slow to trust him, but it became clear that he truly despised his former companions and was a valuable asset to the team, knowing many raider encampments. Although brash and obnoxious, the trio felt complete with him.
One day, when searching for shelter for the night, the gang found an abandoned secret bunker. Inside they found an enormous amount of alien technology, although, with nothing to compare to, the group simply thought it was pre-bomb tech. Included in the mix was a green, glowing lantern and a set of rings. Oddly, the rings spoke to them, telling them that as three men of will it was their destiny to wield their power. They put them on and discovered that they were able to create anything their imagination allowed out of green energy.
Sealing off this bunker so that no one unsavory could discover the power that lay inside, they took their rings and single lantern they had found that seemed to power their mysterious rings.
For some time they became the most powerful gang in the west, their main quest to eradicate raiders preying on travelers. However, their leader, Hal, eventually took this too far and partnered with another visionary leader, Thaal Sinestro. Sinestro was a weirdly pink man who was setting up a dictatorship in the north. Together, but against the wishes of Guy and John, they took a more proactive stance against raiders, killing not only them but their tribes and settlements. John and Guy split from Hal at that point, but Hal retained their one lantern and so they lost power to their rings.
John and Guy began a half-hearted journey back to the bunker, hoping against hope they could find something else to combat their former friend. Along the way they bumped into a young man named Kyle Rayner. Kyle had been following their progress for some time, his own home having been destroyed by raiders, in the hopes of joining them. Although rather annoying to Guy and John, they tolerated his presence as they trekked back to the bunker. There, they found no other lantern or anything that could help them, although Kyle did take one of the rings that were left. They began building a plan to take down Hal and Sinestro, but as it turned out, they wouldn't need it.
Hal had had a change of heart after seeing how their actions only caused more suffering, and he defeated Sinestro in a prolonged battle, the pink man having his own access to alien tech.
Hal Jordan returned to his former teammates and new teammate Kyle and they grudgingly accepted him back into the fold, more out of necessity than actual forgiveness. Since joining back, however, Hal has faced new problems as Guy Gardner continues to challenge his leadership role. Kyle has proved a decent buffer to this, however, and they continue their journey of taking out raiders.
Along their travels they've heard tale of others rising up to face evil, but until they've conquered their own problems they refuse to take any new members or join anyone else's movement.