@sooty I'm assuming Lili was the water g o d because wasn't she the only one who deferred from joining mu's government? Alabasta had a huge arc involving water, and vivi's dad and vivi have been heavily referenced as important to imu. Lili aligned herself with joyboy i thought. And imu has a really weird obsession with Nefertari Vivi.
Lowkey davy jones could have been the original joyboy or maybe the original water g o d. But i'm just thinking of davy jones's locker haha.
Since so many important people are being revealed rn - I'll guess more: The owl that saved the books could be a moon g o d, or another rare mythical user, and like others have guessed Dragon is possibly now the water g o d. I think vivi is just related to the great weapons and so is shirahoshi (they're not embodiments of godly power like the devil fruits have been).
yeah i'm pretty hardcore... Into yaoi!