[Theory] The 7 great mysteries!

[ziggyZ]

Perhaps this has been done, maybe not. Anyhow, for those who don't know, there are 7 mysteries in the world of OP which Oda has dubbed "great". Where did I get this from? In the SBS Volume 20;

R: Oda-chan!! Today is the day for you to answer this!! What about Sanji's left eye?![6]

O: There it is... again. I get a lot of these. So many, in fact, that I usually just ignored them... all right. I will finally answer one of One Piece's 7 great mysteries, "Sanji's Left Eye"!! Come on out, Sanji!!

S: Hey. You called? What? You want me to show you my left eye?! THAT'S what you called me for? Honestly... fine, fine. You wanna see it? There you go, take a good look. See?

O: WHOAAAAA!!! FOR REAL?!! WOW...!!THE SBS IS OVER!! SEE YOU NEXT TIME!!

Now, in Volume 23;

R: In an SBS in Volume 20, you said "Sanji's left eye is one of the 7 great mysteries". So what the hell are the other 6?! I'll bust a SHAKUSHI on you if you don't tell me!!!![3]

O: Very well. I'll announce them all right here. To start, the 2nd mystery is, "The 7th mystery is a mystery". The 3rd mystery is, "The 6th mystery is a mystery". The 4th mystery is, "The 5th mystery is a mystery". So... hahaha! It's a bundle of mystery! ...I'm sorry. I'll think of some for you. (not) (not?)

But after the TS, Sanji turned his hair to the other side, thus showing his left eye. Which means........One of the 7 great mysteries have been found meaning there are only 6 left. But... WHAT THE HELL ARE THEY!?
And these are what I've came up with

Spoiler

What is One Piece?
What's the "Will of D" and what does the "D" in some people's names stand for?
What was the name of the Ancient Kingdom and what happened to it?
How did the World Government come into power?
What happened during the Void Century?
Who is "Joy Boy"?
What is the origin of Devil Fruits?
What's the "voice of all things" Rayleigh was referring to?
What is DoFlamingo's "New Era" and what does he intend to do?
What's so weird about Blackbeard's body that allows him to eat more than one Devil Fruit?
Why exactly hasn't anyone (such as one of the Yonkou) besides the Roger Pirates been able to reach Raftel?
What's the purpose of the Polyglyphs?
What's the deal with the Ancient Weapons? Who created them and why? And what exactly can they do?
What were those "things" that towered over Thriller Bark in the Florian Triangle which LOLA saw?

So which do you think are part of the "6 great mysteries"????

 

[Noni]

will of the D.
where is one piece.
voice of all things.
world goverment power.
what are the ancient weapons.
origins of devil fruit

 

[ziggyZ]

will of the D.
where is one piece.
voice of all things.
world goverment power.
what are the ancient weapons.
origins of devil fruit

Interesting. What about those enormous figures?

 

[Exittrigger]

will of the D.
where is one piece.
voice of all things.
what are the ancient weapons.
origins of devil fruit
"things" that towered over Thriller Bark in the Florian Triangle which LOLA saw ( this has been bugging me more than the others though except for the will of D and the devil fruit origins...)

 

[Yellow Spark]

1.The void century(it will include joy boy)
2.will of d.
3.Voice of all things(i think it means that to improve your observation haki to such a level that you hear everything in this world even plants and sea kings voice)
4.Origin of devil fruits(it will include how bb ate two fruits)
5.hawk eye secret
6.those things in thriller bark.