Seis Fleur: Twist is one of the many unique methods used by Nico Robin, an archaeologist and one of the most highly prized members in the Straw Hat Pirates from the manga and anime series One Piece. This ability materializes from Robin's Devil Fruit powers, the Hana Hana no Mi, which allows her to sprout replicas of her body parts on any surface. The name "Seis Fleur" literally means "Six Flower" in Spanish, referring to the number of limbs that Robin creates for this particular technique.
In the original Japanese version, the technique is written as "六輪 （ セイス ） 咲き （ フルール ）" (Seisu Furūru) with a kanji meaning "Six Profusely Blooming Flowers". This naming convention is consistent with the floral theming of all of Robin's abilities, where her power is referred to as organic in nature.
This is the Seis Fleur: Twist technique—Robin grows six arms on a opponent's body. After manifesting, these arms combine to forcefully twist the target's upper body, quite effectively rendering a target immobile and probably causing incredible amounts of pain or injury. Most importantly, this move shows that Robin fights intelligently, showing a very strategic approach in using her powers to incapacitate foes without having to exert even one bit of her physical strength.
What really works about Seis Fleur: Twist is that it's versatile and has that element of surprise. For the most part, enemies are caught off guard as suddenly there are arms on their body. This usually gives Robin an unfair advantage in most fights. This could work in quite a few ways: restraining the opponent, setting up an opening for allies, or even for further higher-pressured attacks.
One of the more notable variations of this technique would be the "Seis Fleur: Slap," in which Robin develops six arms on the front side of a torso of an opponent to quickly slap their face. Since this adaptation once again shows that Robin modifies her techniques according to the fighting situation at hand, further fueling her tactical image, it is one of the more remarkable variations of this technique.
Through the series, Robin has used Seis Fleur: Twist in conjunction with other abilities. She is mostly followed up with "Ocho Fleur: Flip," whereby she knocks over an opponent who is already disoriented using eight arms. This further gives evidence on the mind and strategic thinking of Robin and the ability to link chained attacks to maximum effect.
Seis Fleur: Twist is the technique that featured in many episodes and chapters of One Piece and became one of the recognizable fighting styles of Robin. It's a visually impressive, really effective technique, so it gained lots of fans who draw and animate this technique.
As the series progresses, Robin's character, combined with her abilities, is getting much stronger. While Seis Fleur: Twist has remained one of her major signature moves, more complex and greater ones have been added in. It proves that Robin is getting greater control over her Devil Fruit powers and has become an integral part of the Straw Hat crew.
Worth noting, the Seis Fleur: Twist technique, much like many of Robin's abilities, depends on her concentration and stamina. Moving each limb she spawns takes mental effort, and overuse can cause her to tire. In this way, there's a hint of strategy added to Robin's fights, as one must choose with some deliberation when and how exactly she can use her techniques to best effect.