Is Imu from the first world then?
Idk. This is what is confusing. Imu is from the Nerona family, which is one of the 20 kings in Joyboy's time. Its theorized (by Ivankov) that that is when he gained immortality, probably by a previous user of Law's fruit.
What I assumed was Imu is the equivalent to Joyboy, in which both have one of the 4 God powers in the Harley Text. It seems that Nidhogg is a being from that original time too, whether its another god who knows.
But then theres something else that bothers me here because if you take the Harley text's "Wont meet again" in the first 2 worlds and then they "meet again" in the 3rd, it sounds like this is Nika and Nidhogg.
So if the War God fought the Sun God, it implies first world only because the 2nd world suggests they never met again. But this ONLY assumes we have the right people in that context lol.
It could be Loki and Shirahoshi for all we know as originally speculated lol