"Nemuriuta Flanc" translates to "Lullaby Parry," which is a unique technique that Brook, the musician and swordsman of the Straw Hat Pirates, used in the One Piece series. This ability is one of the many ways in which Brook integrates his musical talents with fighting prowess to express a unique and versatile fighting style.
Brook's sword, Soul Solid, is essential to execute the "Nemuriuta Flanc" technique. This is Brook's cane-sword, also known as "shikomizue," which he adeptly and agilely wields. In this technique, Brook had been utilizing Soul Solid in place of a violin bow in strumming his violin to create a soothing melody. The music that rises from this unlikely pair of instruments has a hypnotic effect on the listeners, who then go to sleep in almost no time.
The main reason "Nemuriuta Flanc" works lies in its functionality twofold. First, it serves as a defense move where Brook can take out his enemies without actually having to directly fight them. Second, it gives the strategic advantage of placing a few enemies to sleep, hence leaving them open to attack or, at worst, allowing Brook and his other fellow allies to retreat from danger. This influence of the battlefield without having to directly fight further underlines Brook's versatility as a fighter.
One of the most prominent displays of "Nemuriuta Flanc" was in the New World arc of the Straw Hat Pirates' adventures. Brook using music as a weapon is creative and diversified in the fighting styles throughout One Piece. The fact he's talented at it just goes to show that he still holds himself close to his musical roots, which he originated from, considering Brook was originally the Rumbar Pirates' musician before joining Monkey D. Luffy's crew.
The inspiration for "Nemuriuta Flanc" comes in the background and development of the character Brook. Having been a former musician of the Rumbar Pirates, Brook's life before he died was very musical and full of joy, a theme that continued when he came back to life with the help of the Yomi Yomi no Mi, otherwise known as the Revive-Revive Fruit. Brook is defined by this relationship with music, which "Nemuriuta Flanc" bridges to the past from the present.
Besides the fight aspect, "Nemuriuta Flanc" really gives Brook some depth in character. It portrays his real nature as a musician but also his versatility in surviving the pirate world. Brook's nature as a musician stays even-keel, balancing his position and disposition as a Straw Hat Pirate to a softer side by using it as both a weapon and something that can make people go to sleep.
In the anime and manga alone, "Nemuriuta Flanc" speaks clearly to its visual presentation. Brook is many times depicted sweeping his violin with a calm demeanor to the playing of the melody in the background, which installs serenity amid the chaos of battle. It is precisely that sharpness of contrast between peace and conflict that enhances the technique's impact in such a way that it becomes not only effective but very memorable to the audience when they finally get to see it.
Brook's "Nemuriuta Flanc" has greatly impressed the fans and even the Straw Hat crew. Indeed, his ability to make use of such an unconventional method in battle reflects just how much One Piece takes after the very innovative spirit of its characters to weld such varied and imaginative abilities. Creativity separates the series, making it difficult to tire from its new developments.