Eiichiro Oda’s One Piece is one of the greatest and longest-running fictional series of all time. After 22 years, Oda confirmed that only 80 per cent of the series has been completed so far. During that time, fans have developed plenty of theories regarding the series' plot and its characters.
Some are more recent, while others have been left unresolved as far back as the series' debut in 1997. The following list features 10 ongoing One Piece theories that fans hope will inevitably come true. Fair warning, this list may delve into some spoiler territory, so proceed with caution.
10 Shanks is the Father of Makino’s Baby
On the cover story of chapter 614, Makino, a close friend of Monkey D. Luffy from his hometown, is seen holding an infant while smiling at the news of Luffy’s return. In SBS volume 63, Oda confirms that the child is Makino’s. He also teases that the father is "probably that person”. There are plenty of fans who believe that the father is none other than Red-Haired Shanks. After all, Shanks and Makino have known each other for years and have a positive relationship. Not to mention that there was plenty of time for Shanks to visit the East Blue during the two-year time skip. Therefore, the likelihood that they conceived a child together is pretty high.
9 Monkey D. Dragon Is A Wind Man
Monkey D. Dragon is one of the most mysterious characters in One Piece. Even after two decades, very little is known about him. The only thing that fans are certain of is that he likely possesses Devil Fruit powers. Based on evidence from the Loguetown and Post-War arcs, Dragon demonstrates that he has the power to control the wind and air currents. As a result, this would make Dragon a wind man and possibly a logia-type Devil Fruit user. With the power to control an element as versatile as wind, it is no wonder that Dragon is considered one of the most dangerous characters in the series.
8 The Giant Strawhat Is Connected To Uranus
One Piece fans experienced quite a shock in chapter 906 following the revelation that a giant straw hat similar to Luffy’s is located in a frozen chamber under Mary Geoise. While not much is known about it, it appears shortly after Donquixote Doflamingo talks about Mary Geoise’s national treasure. During the Dressrosa arc, Doflamingo mentions that the treasure could shake the world to its core. With such implications, fans have theorized the national treasure is the Ancient Weapon Uranus and that the straw hat is somehow connected to it. Some fans theorize that the straw hat contains a secret message on how to locate Uranus, others say that it is Uranus and some even think that Uranus is hidden under it.
7 Big Mom Made Kaido Unkillable
In chapter 907, Big Mom and Kaido argue about who gets to eliminate Luffy for interfering in their respective affairs. During their conversation, Big Mom mentions that Kaido owes her a life debt. Several theories soon developed to determine what kind of debt a Yonko like Kaido could owe to someone as powerful as Big Mom.
One theory suggests that his inability to die is somehow linked to her power to control souls. Considering that they were part of the mysterious group Rocks over 40 years ago, it's possible that she could have inserted souls into him to save his life or make him stronger.
6 Luffy’s New Gear Fourth Transformations
In the current manga arc, the Strawhats and their allies are preparing for their showdown with Kaido. In preparation for his rematch against Kaido, some fans predict that Luffy will develop two new Gear Fourth transformations. The first possible transformation could be one that specializes in aerial combat like “Eagleman”. The other is a "Tigerman" form that could possess enough striking power to break through Kaido’s scales. In Japanese mythology, tigers and dragons are often portrayed as equals, and Oda has made it a habit of frequently using mythological references throughout the series. Thus, "Tigerman" sounds like a definite possibility.
5 Blackbeard Is Three People In One Body
During the Marineford Arc, Blackbeard turned the world on its head by using two different Devil Fruit powers. A feat that was supposed to be impossible. One popular fan theory suggests that Blackbeard pulled this off because he has a condition known as "fetus in fetu" and that he has two siblings inside him.
Evidence supporting this theory include how Luffy and Zoro mention during the Jaya arc that Blackbeard is possibly "more than one” guy. During the Marineford arc, Marco also mentions that Blackbeard's body is unique. Finally, his Jolly Roger has three skulls. A design that is similar to a two-headed Jolly Roger belonging to the pirate twins the Decalvan Brothers. All this points to Blackbeard being a genetic chimera.
4 The Ancient Kingdom And Raftel Are The Same
Before their deaths, the scholars of Ohara managed to identify the true name of the Ancient Kingdom. Unfortunately, the Gorosei made sure the name would remain a mystery by destroying them. After the Straw Hats meet Rayleigh, he explains that Gol D. Roger and his crew not only reached Raftel but also uncovered the secret of the Void Century and by extension the Ancient Kingdom. Furthermore, Whitebeard reveals in his final moments that the discovery of the One Piece will turn the world "upside-down". These facts help to support the theory that the island of Raftel and the Ancient Kingdom are one and the same.
3 Joyboy Was The Ruler Of The Ancient Kingdom
During the Fishman Island Arc, Robin discovers a Poneglyph inscribed with an apology from someone named Joyboy to a mermaid princess, who was also the Ancient Weapon Poseidon. A theory soon emerged that Joyboy was the ruler of the Ancient Kingdom. Evidence supporting this theory is based on how Joyboy shares several similarities to a Javanese king named Jayabaya, or Joyoboyo in Javanese.
Jayabaya predicted the fall of his kingdom and had its history transcribed in books and epigraphs, much like how the Ancient Kingdom did with the Poneglyphs. He also prophesized that a chosen one called Ratu Adil would restore harmony to the world. This also reflects Luffy as the destined hero based on his connection with Shirahoshi, the current Poseidon.
2 Devil Fruits Are Linked To Electromagnetism
For years, countless fan theories were created to explain how Devil Fruits work. One theory developed by CAMUNAI explains that the properties of Devil Fruits are centered around electromagnetic waves. The theory uses the science behind electromagnetism to explain how Devil Fruits work, as well as their weaknesses to water, Sea-Prism Stone and Armament Haki. To summarize, water, composed of polar molecules, absorbs the electromagnetic waves of Devil Fruit users which weakens them. Likewise, Sea-Prism stone supposedly shares similar properties. It even manages to explain how Armament Haki affects Devil Fruit users thanks to a phenomenon known as “black body”, where a body or object absorbs electromagnetic radiation.
1 One Piece And The Inherited Will Theory
The "Inherited Will" theory by Ashura_KingFisher is one of the most popular One Piece fan theories. It explains that the One Piece is a project developed by the Ancient Kingdom that involves using the Ancient Weapons to destroy the Redline. Theoretically, this would unite the Grand Line, the Calm Belt, and all four Blues into one ocean. Furthermore, this would also create the legendary All Blue. In chapter 610, the mermaid Madam Shyarly has a vision predicting that Luffy would destroy Fish-Man Island. This also correlates with the theory because destroying the Redline would also destroy Fish-Man Island. However, this also means that its inhabitants would finally move to the surface. Effectively ushering a new era of coexistence between humans, fish-men and merfolk.