The Returners is a faction in the world of Dissidia Final Fantasy Opera Omnia led by Edgar. Though described as a "resistance," their real purpose is to seek answers independently of Materia, Spiritus, and Mog. Edgar named the group in in tribute to the Returners of his homeworld.
Edgar founds the Returners soon after he arrives in the world created by the two gods, though the details of when exactly he arrived or met his followers is unknown. He recruits his old comrade Locke early on, and tasks him with secretly following the party and reporting on their activities. From there, Edgar sends several other Returners to meet with and join them. Edgar also recruits Lightning, Shadow, and Layle. At some point, one of them meets Firion, who agrees to join because he was a member of a resistance faction in his homeworld.
The party led by Mog first learns of the Returners when they meet in the Palace of Malitia region, independently closing Torsions and marking each one with a wild rose as a message to his allies. After speaking with the party, he joins them because their goal to seal Torsions is the mission he was given himself, though he has little information to share apart from the name of his faction.
Later in the same region, the group meets Shadow. He warns them not to trust Mog, but remains tight-lipped about the group and its leader even after he joins them. Finally, Layle reveals that Edgar is leading the Returners. He too warns the party that Mog is not to be trusted and explains that the group is made up of various individuals who don't accept the gods' words at face value and wish to find their own answers about the truth of this world. Lightning meets the group at the Capta Est Tower as she battles Garland and joins after her fight with him creates a supercharged Torsion. She retains the mistrust of gods she gained in Cocoon.
Edgar finally reveals himself to the party when their airship is disabled at Utopia Niveus. He introduces himself and explains his motives, but hangs behind to repair the ship while the party traverses the region to deal with the Emperor. After the battle is over and the airship is repaired, Edgar explains that he found it necessary to found his own group to answer his questions about the world and the distortions in it. Since the party has decided to confront Materia directly, Edgar decides to join the party as a permanent member so he can ask questions of his own.
After joining the party, Edgar releases Locke from his assignment, and Locke wanders independently in search of Phoenix until the party finds him napping in the wilderness, whereupon he too joins.