Mash is a giant octopus introduced in the cover-story adventure Hatchan's Sea-Floor Stroll. Entrusted with guarding a prized takoyaki recipe on the ocean floor, he hides the secret in a compartment tucked inside his mushroom-shaped hat.
This oversized octopus sports a hat shaped like a mushroom, and that hat conceals a small compartment where items can be tucked away, among them the secret takoyaki recipe and its special sauce.
Loyal to the trust Macro placed in him, Mash takes guarding the hidden treasure seriously. His sour expression also makes plain that he holds little fondness for Hatchan.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

When I first decided to commit to watching One Piece seriously, I knew I was embarking on one of anime's longest and most beloved series. With over 100...
For all his fearsome bulk, the octopus is no fighter and went down fast. Following a map handed over by the Macro Pirates, Hatchan tracked Mash down, beat him in a brief scuffle, and rushed off to rescue Camie, convinced the pirates had lied to him. Only after defeating Macro's crew did Hatchan learn of the compartment tucked inside Mash's hat; returning to open it, he recovered the recipe and sauce. He then hauled the beaten octopus and the sauce away to cook takoyaki for his crush Octopako, though he wound up serving the dish to the people of Headband Catfish Village instead. What became of Mash afterward is never revealed.
Mash is a giant octopus who appears in the cover story arc Hatchan's Sea-Floor Stroll, tasked with guarding a prized takoyaki recipe on the ocean floor.
Mash guards a secret takoyaki recipe and its special sauce, entrusted to him and hidden inside a compartment in his mushroom-shaped hat.
Hatchan tracked Mash down using a map from the Macro Pirates and beat him in a brief scuffle before discovering the hidden compartment inside his hat.
Mash hides the recipe and its sauce inside a small compartment tucked inside his mushroom-shaped hat.
After being defeated, Mash was hauled away along with the recovered sauce so Hatchan could cook takoyaki for his crush Octopako. What became of Mash afterward is never revealed.
Looking for more on Mash? The One Piece Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the One Piece anime series, manga, and official materials. Episode and chapter references are cited where applicable.
Rights holders
All rights belong to their respective owners.
Character and scene imagery on this site is original artwork by Daddy Jim Headquarters, not screenshots or licensed imagery. Official cover art is used on three types of pages for editorial commentary:
Official resources:
Daddy Jim Headquarters maintains this encyclopedia. If you spot an error, a translation issue, or something that doesn't look right, let us know.