Theories on what One Piece is/contains.
// One Piece is on Raftel
–> Roger says he left it in “that place.”
–> I don’t think there has ever been anything definitive on this. It’s just implied very heavily!
–> Robin does, however, believe that the Poneglyphs will guide them to Raftel, where the Rio Poneglyph might reside.
// One Piece is a great treasure.
–> Page 1 of Chapter 1.
–> Whitebeard’s proclamation: “One Piece Exists!” Newgate wouldn’t have said this if it was Roger’s personal treasure.
// One Piece is the Rio Poneglyph
–> Currently finding panels for this but any fan of the series knows why this might be out there.
// One Piece is Luffy’s Straw Hat
–> Luffy’s “treasure” may have been Roger’s “treasure” as well.
<– Whitebeard’s proclamation: “One Piece Exists!” Newgate wouldn’t have said this if it was Roger’s personal treasure.
// One Piece is the Ultimate Devil Fruit
–> Well, I guess it could be. I don’t know if there’s a lot of evidence out there supporting this.
// One Piece is.. in your heart (nothing).
–> Whitebeard’s proclamation: “One Piece Exists!” Newgate wouldn’t have said this if was nothing.
“Sengoku… All of you… The World Government…
It’s going to come… A grand battle that engulfs the entire world is coming!!!
Not that I care… But whenever someone finds that treasure… The world will return to surprise…!!
Send someone to find it. The day will surely come…
One Piece… It exists!!!”
Whitebeard was too awesome. But he specifically mentions that those “who carry the will of Roger” and now Ace are those who “fight for this world.” Even more importantly, he hints that this will has been passed down “time and time again,” most likely from the time of the Void Century. This all points to One Piece possibly being Poseidon or Pluton, but more likely a third, not yet introduced weapon, being that One Piece will incite a war. Some people argue that the third weapon’s name will be Zeus, being that Poseidon rules the sea, Pluton rules the underworld, and Zeus is the ruler of the sky.