A Logia built around mud, this fruit lets its holder become a living bog, spawn inescapable swamps, and hoard an endless supply of goods inside his own body. Caribou puts it to work drowning, snatching, and stockpiling whatever he pleases.
Grouped with the Logia, this power reshapes its consumer into a Swamp Human who can conjure mud, steer it, and dissolve his own frame into it at will. Caribou is the one who ate it, and the fruit holds a pair of firsts: it was the earliest Logia and the earliest brand-new Devil Fruit of any kind to be shown once the time skip had passed. In Japanese numa stands for a swamp or bog, and translated editions title it the Swamp-Swamp Fruit. What it produces is a thick sludge, part earth and part water, of the sort found around marshland.
With this ability Caribou opens depthless swamps that offer no way out, since anyone who thrashes about only sinks further down. That same mire acts as a vault of boundless capacity: he tucks away limitless captured material inside himself, whether prisoners, weaponry, or roughly a month of provisions that keep well over long spans. Creatures can be held alive within him for concealment, or he may let the swamp drown them if that suits him. As Logia go, his intangible body soaks up strikes harmlessly rather than being struck, yet much like Blackbeard he has to absorb a blow instead of letting it pass through. The one glaring flaw is his inability to resume his true shape when trapped somewhere his real body cannot fit, which is how Franky corked him inside a barrel. The fruit also offers scant offense beyond drowning, and because his mud amounts to little more than water-mixed soil, anyone who bends water to their will, Jinbe among them, poses a threat. His single named strike is the Numa Numa no Gatling Gun, a crank-driven weapon that rises out of his swamp-filled gut. He further leans on the swamp form for stealth, clinging to overlooked corners and stretching parts of himself, an ear for instance, to listen in on others.
Caribou is the fruit's sole owner. He converts his lower half into a swamp to trap living targets, swelling his body to fold around bigger prey such as Shirahoshi, and he smothers foes by wrapping their heads in mud spheres. His mistaken faith that this defense could never fail left him exposed the moment Armament Haki blunted his element. That blend of absorption alongside a boundless hollow within draws the fruit strikingly near Blackbeard's own Yami Yami no Mi.

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Caribou is the only known character to have eaten the Numa Numa no Mi. It is a Logia-type Devil Fruit that turns him into a living swamp, letting him conjure and control mud.
The Numa Numa no Mi is a Logia-type Devil Fruit that reshapes its user into a Swamp Human able to conjure mud, create bottomless swamps, and dissolve his own body into it at will. English releases call it the Swamp-Swamp Fruit.
The Numa Numa no Mi holds two firsts in the series: it was the earliest Logia-type Devil Fruit shown, and the earliest brand-new Devil Fruit of any kind introduced after the time skip.
Caribou's key weakness with the Numa Numa no Mi is that he cannot resume his true form when trapped somewhere his real body cannot fit, which is how Franky once sealed him inside a barrel. Armament Haki can also bypass his intangible swamp form.
Caribou's named technique with the Numa Numa no Mi is the Numa Numa no Gatling Gun, a crank-driven weapon that rises out of his swamp-filled gut.
Looking for more on Numa Numa no Mi? The One Piece Wiki on Fandom has a dedicated page with community notes.
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