The first world's script is kind of strange.
"There was fire below the earth"
"Mankind touched the forbidden sun"
Given that the lines are one after another, I presume that the Fire under the Earth and the Forbidden sun are connected. So we have a source of power that equals the sun under the earth that was Forbidden, but someone harvested it anyways
Here we have people in Elevators bringing up Suns from below, with a King In all Black near them. I presume that this King that Harvested the Sun...I will cover "The Enslaved in world 2.
The Earth God with a serpent of fire, so these are two different creatures in all likely hood. (Note, there is an Egyptian God of Chaos that is a Serpent and is an enemy of Ra the god of the Sun). I don't think these gods are connected to Imu and Co directly. The first and second world seem to predate the current situation by quite a bit.
"They will never meet" is a strange phrase to come up, The Sun god most certainly encountered the God of Earth and it's Serpent.
The Forest God taming Demons seems like an Origin for Devil Fruits, or at least the Proto devil fruits.
The Symbol of Wano's rebellion was a Crescent Moon Right? Like that is a depiction of a Half moon typically isn't it? And that came from Oden wearing them on his Shirt?
Wano would probably be the Half Moon people. I don't know if they ever really explained where the Reverse Crescent Moon became a thing for the Rebellion but those two things would have to be connected.
The Full Moon people would be the Minks.
Now I am going out of Order a little, but the Sun being mentioned as the bringer of War, as well as something Humanity killed to become God. I am starting to think perhaps the "Sun" that keeps getting Mentioned..isn't a Sun...but a SON. What if The people of the first World Enslaved the Son of the Earth God and used his power to build a Civilization. This is the Enslaved that Prayed to be free and created Nika, Possibly by giving someone it's power and making Nika.
I think the Third world is the one that lead up to the current status qoe. We have a Nika like figure leading various races against a Giant Demon holding a Sun, from the figures with Nika we can see quite a few things we have seen.
We have Animal looking characters (one near the merfolk, one near the Giant and whale) which have to be Minks.
We have Samurai with top Nots right by the Tree Branch
We have Lunarians
We have Merfolk
We have Tontatta (near the Merfolk)
And I don't think this Imagie is going to be Luffy in the future because the Robot is there...and This Nika is using a Sword and Shield, which has the same symbol that one of the ships behind him has on it. Interestingly this is the first time we really have Joyboy and Nika correlated. Vegapunk stated that the records of the Ancient Kingdom said that Joyboy was BORN with his rubber body, not that he had aten a devilfruit.
The God of Earth and Sea, and the Giant Devil looking thing are the most intriguing parts of it given the context of the text. They LOOK as if they should be the Celestial Dragon's Zoan forms..but the Winged one seems to be Fighting against the Serpent one so I am not sure they don't seem to be allied.
The lack of any figure that could clearly be Imu (the early part has someone wearing a Crown..but that guy has to Predate Joyboy, thus presumably predates Imu since Imu is so far implied to be one of the Original 20 that seized power after Joyboy beat up The giant Demon fucker that is holding a Sun)
I also Dunno how any of this leads to a Story that Roger will laugh about.