Thanks to Schwahn for the inspiration!
Earth – Our Earth – was created by Lightning and the Gang.
After defeating big-baddie in Lightning Returns, it is implied they created the earth that we live on now.
What we don’t realize, is that is %100 the truth!
Lightning is protected by the world governments and she finally convinced them to let her be a little public. When she modeled for Louis Vuitton.
At least, this is the idea at the end of the Lightning Returns: Final Fantasy XIII.
With the old world no more, Lightning and her friends find a glimmering crystal in a void. The Eidolons and Mog bid their farewells and fade away while Lightning and the souls of humanity leave for the new world. Having begun her life anew, Lightning, no longer dressing like a soldier or a servant of the divine, steps off a train in a countryside on a peaceful journey to reunite with one of her friends.
But also consider another Earth in another Final Fantasy game: The Blue Planet:
The Earth is the name of the planet in the game Final Fantasy IV, Final Fantasy IV -Interlude-, and Final Fantasy IV: The After Years. It is known to the Lunarians as the Blue Planet and to the Dwarves as Mother Earth (SNES version). It is divided into an Overworld and an Underworld. It has two satellites: The Red Moon, and a larger, natural moon. The True Moon briefly orbits it during the events of The After Years.
It could be possible that Lightning created Final Fantasy IV’s Earth, not ours. Notice that where Lightning walks looks to be a countryside villa, which looks to be medieval. Of course, we see her riding a train to her new destination, so what happened? Very possibly, a cataclysmic disaster that would have devolved the world into chaos, one that could have destroyed all technology. A disaster this big could have split the world in two forms, ruining the first one’s balance.
What other world could be Earth, yet also have a train? Many people assume Final Fantasy IV and VI take place in the same world. But what if Final Fantasy IV were the sequel to Final Fantasy VI. Perhaps it actually devolved into a medieval setting with very little technology?
Final Fantasy VI’s planet doesn’t have a name. If it were related to Final Fantasy IV, the planet’s name could carry over. In this sense, Lightning creates the world of Final Fantasy VI, and it becomes Final Fantasy IV’s world. However she appears in Louis Vutton is beyond me.