Nami Mermaid Theory: She’ll Drink the Fish-Man Potion

With the Final Saga pushing One Piece toward its ultimate conclusion, fans worldwide are scrambling to decode Oda’s deepest secrets — but a bombshell theory from Japanese analysts at Drop the Pizza suggests the answer has been hiding in plain sight for decades, buried in Oda’s pre-serialization prototype works. If this theory is correct, Nami will drink a “mermaid potion” and become a mermaid, Laugh Tale is located on the ocean floor, and the very title Hammer Fish — a manga Oda never published — is the skeleton key to understanding One Piece’s endgame.

The Theory

This theory reframes Nami not merely as the Straw Hats’ navigator but as the story’s true “Little Mermaid” figure — a human destined to become one with the sea. More critically, it provides a structural reason why Laugh Tale cannot be reached by Devil Fruit users, explaining decades of carefully planted details from Oda’s very first creative works all the way through the current Final Saga.

Evidence from the Manga

1. Chapter prototype — Hammer Fish (pre-serialization): Oda wrote an unpublished manga called Hammer Fish that centers on a drug which allows a human to breathe underwater and swim like a fish — the direct opposite of what a Devil Fruit does. The protagonist’s companion drinks a “half-fish bean” and gains aquatic ability. This is not a coincidence; it is the narrative blueprint Oda has been building toward.
2. Chapter prototype — naming logic: The word “Hammer Fish” contains a deliberate double meaning. In Japanese slang, kanazuchi (金槌, “hammer”) means someone who cannot swim. The title literally translates to The Non-Swimmer Fish — a fish that cannot swim. Oda was encoding the concept of “Devil Fruit user who cannot enter the sea” into his very first published prototype, years before One Piece existed.
3. Chapter 490 / Fishman Island arc — Nami’s origin at sea: Nami spent years enslaved by the fishman pirate crew of Arlong — a shark fishman — and was later threatened by Hody Jones, another shark fishman. Despite being surrounded by fishmen her entire formative life, she cannot breathe underwater. Her entire backstory screams ironic contrast: the woman who commands weather and reads the sea cannot enter it. Giving her a mermaid potion resolves this irony narratively.
4. Chapter 1 — Shanks does not eat the Gum-Gum Fruit: Shanks personally delivered the Gum-Gum Fruit (Hito Hito no Mi, Model: Nika) to the East Blue, yet never consumed it himself. The theory argues this is proof that Shanks — a member of the Roger Pirates and someone who knows where Laugh Tale is — understood that becoming a Devil Fruit user would mean he could never return there. Swimming ability is not optional for reaching Laugh Tale; it is the requirement.
5. Chapter 96 — Buggy’s fever during Laugh Tale: When Roger’s crew reached Laugh Tale, Buggy was the only crew member who did not make it — because he had a fever. The theory suggests Oda deliberately invented the fever as a narrative alibi. Buggy was the Roger Pirates’ only known Devil Fruit user at the time. If he had reached Laugh Tale with the rest of the crew, readers would have realized that Devil Fruit users can reach it — which would have broken the theory’s core logic. The fever was a necessary plot device to hide Laugh Tale’s true nature.

📌 Key Evidence: In Oda’s pre-serialization prototype Hammer Fish, the female lead character is deaf and therefore cannot speak — a direct parallel to the Little Mermaid, who sacrifices her voice. The protagonist pair (Clam and Pesca, both seafood-named) mirror Luffy and Nami. Their shared quest to find a rainbow-glowing legendary fish called “Orage” (French for “storm”) parallels the Straw Hats’ voyage to Laugh Tale. Bellemere, Nami’s adoptive mother, has a French name. The water spirit who gives the mermaid potion is named “Fontaine” — French for “fountain.” Nami’s hometown, Cocoyasi Village, is in the Orange (Nami-no-Shima) archipelago — and a fountain stood in that town when Luffy and Nami first met.

📌 Key Evidence: The seven bosses in the Super Famicom RPG Romancing SaGa — a game Oda is confirmed to have played — bear a striking resemblance to the Seven Warlords of the Sea concept. One of the seven is explicitly a half-fishman who controls ocean currents. The game also features a “mermaid potion” item. Oda has stated publicly that Romancing SaGa influenced his work, which makes the presence of a transformation potion in that game highly relevant to this theory.

Our Analysis

What makes this theory exceptional is that it does not rely on a single piece of evidence — it weaves together Oda’s pre-One Piece creative DNA with structural plot requirements the story has always needed. Laugh Tale being on the ocean floor is not merely a fun idea; it is arguably the only explanation that satisfies two longstanding mysteries simultaneously: why Joy Boy hid the One Piece somewhere the World Government cannot access, and why Shanks — the most capable pirate alive — chose not to eat a Devil Fruit despite holding one in his hands. Joy Boy did not bury his treasure in a dungeon or behind a cipher. He buried it beneath the sea itself, the one place Devil Fruit-empowered rulers can never go. The ocean is the ultimate lock, and only those willing to be “of the sea” can turn the key.

The Nami-as-Little-Mermaid symbolism has always been present but easy to dismiss as aesthetic flavor. This theory argues it is literal and structural. Nami’s entire arc — enslaved by fishmen, liberated by Luffy, drawn to Fishman Island before she ever met him, born in a kingdom whose symbol is a whale, given a name meaning “wave” while every other major female character carries a flower name — reads as Oda meticulously constructing a character whose destiny is the sea itself. Her transformation would also carry enormous thematic weight: the woman who was exploited and terrorized by fishmen ultimately becomes one, on her own terms, to save the world.

The most elegant detail in this entire theory is Buggy’s fever. Oda is not a writer who wastes chapters on convenient illnesses. If Buggy simply “got sick,” that is fine. But this theory gives the fever a purpose: Buggy’s Devil Fruit ability means he can never reach Laugh Tale under the ocean, and Oda needed to remove him from the Laugh Tale sequence before readers could notice. The fact that no other Roger crew member is ever confirmed to be a Devil Fruit user reinforces this reading. Counter-evidence worth noting: Oden ate a Devil Fruit and was part of the Roger Pirates — though his Toki Toki no Mi’s underwater weakness may complicate the theory. However, Oden was not present at the final landing on Laugh Tale according to what we know of the timeline, which keeps the theory intact.

Theory Credibility Rating

The convergence of Oda’s confirmed prototype works, the structural necessity of Laugh Tale’s location, Shanks’ deliberate avoidance of the Devil Fruit, and Nami’s layered Little Mermaid symbolism creates one of the most cohesive and evidence-rich theories in the One Piece fandom — docking one star only because the mermaid transformation itself has yet to receive any in-manga confirmation.

Source: https://www.youtube.com/watch?v=y83Xq7Hpyx4