Buku Buku no Mi

Falling under the Paramecia class, this Devil Fruit lets its owner control books, which turns them into a Book Human. The eater is Charlotte Mont-d'Or of the Big Mom Pirates. The name derives from bukku, how the English term "book" is spoken in Japanese.

The fruit gives its holder telekinetic command over any nearby books no matter their size, letting them float the volumes about and even stand on them as platforms. Its greatest power is locking a living creature away inside the world of a book, achievable by two separate methods. Holding an open book above a target places that target under a visual illusion of being inside the book's world, an effect that breaks the moment the book is closed. The other approach physically converts a captive into a drawing on the page, a state in which aging stops entirely; Mont-d'Or typically pins captives with oversized, seemingly unbreakable nails. These inner worlds have no boundaries of space or design, since the user's imagination shapes them, and a special bookmark slipped into a page lets a person pass freely between the book and the outside. The fruit also enables wide, remote communication: Mont-d'Or once rang many Den Den Mushi simultaneously by connecting them all through a book. Being placed under such a scenic illusion dims eyesight alone, so the ensnared person keeps moving and relying on their remaining senses, and anyone bound within the pages can still speak to the outside so long as their page is left open. Burning a book frees whoever is held inside, though the flames endanger them too. The standard Devil Fruit weaknesses otherwise apply.

Charlotte Mont-d'Or mainly uses the fruit to hold Big Mom's collection of rare beasts and her prisoners captive inside enormous picture books, nailing them down and shelving them in a vast library within Whole Cake Chateau, with strange creatures kept in the regular library and ordinary prisoners in an underground Prisoner Library. He also coordinates the Big Mom Pirates by chaining several Den Den Mushi together to reach many crewmates at once. In a fight, he treats normal-sized books as airborne footholds to fly and drops foes into his book-world illusions, leaving them distracted and exposed. His signature technique, "Hon" no Sekai, or World of Books, hovers an open book over an enemy to snare them in the illusion until the book shuts.