OnePiece : Are these characters somehow linked to one another..?

There are characters that we already knew that hold certain mystery..
Maybe Oda don't want to reveal it yet..
Hope that in future time we could get to know them better..

Mystery is the exact word to describe them all..
Yeah..
For me, these characters shrouded in the cloud as thick as Emperonimbus..
Who are these characters..?

Let me list them all together :
i) Momonosuke

This young samurai from Wano..
The son of Lord Oden..
The one who ate artificial DF that could turn him into Dragon..
Momonosuke seek help from SH to help them fight to gain back Wano Ku Ni from Kaido..
The mystery is this young boy could hear voice of all things and then instruct it (in this case, Momonosuke could hear Zunisha's voice) to attack Jack the Mammoth..
Who is Momonosuke..?
Is he Ancient Weapon so called as Uranus..?
Only Oda knew the answer..

ii) Aisa

This young girl from Skypiea..
The one who got Mantra's power..
The Shandian's girl..
If Mantra is another word of Haki..?
Could she got that observation Haki..?
Or maybe she is more than that..?
Aisa could sense her surrounding..
Could it be that she also one of the ancient weapon..?
Only Oda knew the answer..

iii) Nefertari Vivi

This lady from Alabasta Kingdom..
The princess of Nefertari Cobra..
The one who once known as Miss Wednesday..
Vivi travel with SH from Reverse Mountain until Alabasta Kingdom..
We all know that Nefertari bloodline somehow linked with the Pluton (one of the ancient weapon)..
We all know that Franky got Pluton's blue print (maybe this is just a copy of Pluton)..
If Pluton is a large ship..
Maybe Nefertari's blood needed to activate that weapon..
That's just my speculation..
But what if the real Pluton need to be activate by some thing..
We knew that Poseidon is a living creature (mermaid)..
Maybe blood is needed to access Pluton..
That's still mystery to me..

My question is..
Why Oda tell the truth about Poseidon (Princess Shirahoshi the mermaid)..?
Because maybe he gave us hint about the other ancient weapons..

What do you guys think..?
Please COMMENT below.. ^^