Nami is Uranus. My pet theory.
Honesty, Sanji had a more closed-ended backstory than Nami or Zoro.
Second theory, Tashigi is Hiiyori and will be in the Wano arc in later parts. Komurasaki is a red herring to throw us off but was just Kyoshiro's sister or something whom he had to live a tough life with in the Red Light District, and he would rather slay her than have her get slowly chewed on. Or faked her death. Or Tashigi is Zoro's lost friend and there's some as yet unrevealed plot behind it. Gotta be something going on with it. And Oda had this in mind since Loguetown, too.
But back to Nami. Compared to Sanji at Baratie and Zoro's backstory, Nami is very odd. She and her sister arrived with Bellimere, who quits being a Marine. Do we even know if she deserted? We assume it was honorable, but it almost sounds like she was presumed KIA after some kind of battle. Nami definitely had parents somewhere in the past. Why are they not mentioned? Why has she not remembered ANYTHING? Even snippets? Shew as very young, yes, but where did she come from? Her abilities to control the weather are also odd. They give her a natural talent that should be impossible. Vivi's telling statement was that Grand Line Cyclones were impossible to predict, yet Nami fundamentally knew immediately when there would be one, and when she was down with fever to boot.
In fact, there was no way for her to have sensed weather changes from inside the ship, but she did anyway.
If not for the weather issue, I would guess Nami to be a Celestial Dragon that was presumed killed at early life and thus never looked for. I almost expected Reverie to give us a hot female Tenryuubito who obviously resembles Nami... (although most beautiful women in OP now resemble each other, especially post time skip, so that is not saying much. But still. Oda could do other things, like give us a Nami moment where one of them freaks out over a dropped penny and threatens to shoot everyone around her if they dare touch it, or such)
The addition of the weather phenomenon adds a monkey wrench. It is Nami's theme. Is it just her special ability like with Zoro's durability? But Sanji had unbelievable durability way back in East Blue. He survived his fights with Don Kreig's crew, and then battle underwater against a Fishman from the Grand Line, and he won. That was impressive. It was obvious he did not have a normal physiology. And made constant small references to being a prince. Smart readers caught on, most just scoffed, I was one of them. Mockers mocked. And then boom. Germa 66, rulers of ALL North Blue, the strongest of the four blues.
So yeah, Zoro could very likely have a reason for his inhuman power. And if that is true for him, so it could be well for Nami. Her past is open-ended and frankly I see no reason for Oda to not have planned out something, even if he was just trying to be mysterious. Nami having just been found out lost at sea is too much. She do be Uranus or indirectly related.
Specifically: She is to Uranus what Shirahoshi is to Noah.
In that same vein, another crazy theory! the Nefertari family actually keep the secret of Pluton buried because they have a relation with it. So Vivi would be to Pluton, the ship, what Shirahoshi is to Noah. Yes there are great battle ships, but there is another, living component. In Poseidon's case, it requires a Mermaid Princess who can command Sea Kings. She has Noah to ride in. Some may be the case with the other two ancient weapons. Perhaps they were not meant as weapons at all, but as something else. Perhaps that is the true reason for the WG's fear of people learning the truth! It is because people will learn the long demonized superweapons are in fact not weapons or destructive inherently at all!
That seems to contradict what we have seen, and Pluton appears to be a real superweapon by the way Franky reacted. Could also be he simply did not fundamentally understand at what he looked. We never did see what Pluton looked like. It could look like a freaking Flying Saucer! Or at least something totally different from the standard. That would explain how when Franky showed the plans to CP9, those who worked at Galley-La stared in shock and disbelief. They were silenced by what they saw on paper and knew it to be genuine. I don't recall Spandam's reaction, but he's not a reliable source for anything.
So with Nami, perhaps she has an inherent relationship with the weather. I always suspected perhaps Enel and the Ark were actually Uranus, and Oda just did not tell us. That would explain how Robin knew about the Goro Goro no Mi. She read about it on a Poneglyph. But it is strange she wouldn't have mentioned that the ship plus Enel equaled an ancient superweapon (even though it displayed such powers and was related to the weather, which is confirmed for Uranus, yes?)
Not sure. As with the Enel bit, there all sorts of possibilities. But that's why I am posting it here with the crazy theories.
Oh, and Linlin ended up with Amnesia. That was one others speculated would happen way back in WCI. Though I thought it would be opposite... guess she will remember things from the start up, and her recollection of what became of Caramel will send her flying to the giant's island Elbaf to learn the truth.