User is able to wield a sword with supernatural proficiency in speed, power, and skill, allowing them to perform seemingly impossible feats with ease, such as cutting through nigh invulnerable or intangible materials, blocking or deflecting things that should be impossible to block/deflect and even slash targets from any distance.
The user's skill with a blade is so great that they can wield blades they shouldn't be able to such as Empathic and Bound weapons.
Lightning God's Blue Dragon Sword (Yongbi the Invincible)
Sephiria Arks (Black Cat) is a master swordswoman, enough to completely atomize her target with her ultimate technique, Mekkai.
Creed Diskenth (Black Cat) using his Imagine Blade ability to create a supernatural blade that can allow him to perform devastating feats such as slicing through the nigh-unbreakable orichalcum.
Genryusai Shigekuni Yamamoto (Bleach) can accomplish supernaturally powerful swordsmanship with the power of his Zanpakuto, as any Soul Reaper who achieved at least Shikai can.
Retsu Unohana (Bleach) was once feared in Soul Society for her absolute mastery of swordsmanship.
Kenpachi Zaraki (Bleach) is a tremendously powerful master swordsman, even without practically any formal training.
Inu no Taisho (Inuyasha) was a powerful demonic swordsmaster with complete mastery of both Tessaiga and Tenseiga, he was also the only one who can fully control Sō'unga the sword of hell which can destroy the world.
Shigure Kosaka (Kenichi: The Mightiest Disciple) has mastered the art of the sword to the point that not only can she become one with her sword but even become one with other peoples swords too.
Ryuma (Monsters) was a extremely powerful samurai from the Wano Country...
...regarded as the strongest swordsman of his time for slaying a dragon with a single slash.
Roronoa Zoro (One Piece) is a powerful master swordsman. He is able to easily cut through materials even stronger than steel...
...utilizing the very air itself to create a Slash Effect attack from a distance...
...and using Santoryu Ogi: Ichidai Sanzen Daisen Sekai (Three Blade Style Secret Skill: Great Three Thousand Great Thousand Worlds) to slice through Pica's giant stone golem. As classified by Brook, he is a user of the Power of Destruction.
Dracule "Hawk-Eye" Mihawk (One Piece) is known as the World's Greatest Swordsman. He can destroy entire fleets of ships with compressed air slash attacks, cut apart giant icebergs with immense power, deflect the course of bullets with subtle movements of his blade, and even defeat weaker opponents with a small dagger.
Fujitora (One Piece) is a blind master swordsman who combines his skills with Gravity Manipulation via his Devil Fruit powers.
While Cavendish (One Piece) is a genius of the sword by himself, when taken over by Hakuba, he became able to cut down the strongest enemies without any effort at all.
Ryuma (One Piece) was a extremely powerful samurai from the Wano Country in the New World. In life, he was regarded as the strongest swordsman of his time and was legendary for slaying a dragon. Postmortem, he wields Shusui with destructive power and proficient skill.
Brook and Kin'emon (One Piece) imbuing their blades with cold soul energy and flames to perform supernatural attacks.
Trafalgar D. Water Law (One Piece) combines his sword skills with Ope-Ope Fruit powers, allowing him to cut apart massive objects and Haki enhanced defenses.
Saga (One Piece) wielding the Shichiseiken, allowing him to perform supernatural swordsmanship skills and techniques.
Despite being nothing more then a mere Mystes, Tenmoku Ikko (Shakugan no Shana) is the most feared being in both the crimson realm and human world as he is such a master of the blade, that he can easily do things that are said to be impossible with it. And his skill is so great that neither Crimson Lords nor the most powerful Flame Hazes are able to stop him or even halt his progress.
Gearfried the Swordmaster (Yu-Gi-Oh!) possesses such godlike skill with the sword that he is capable of wielding empathetic and soul-bound weapons with ease, as well draw out the absolute potential of any blade he wields.
Kazuma Kuwabara (Yu Yu Hakusho) wields the Dimension Sword, which allows him supernatural feats of slicing even intangible dimensional barriers, though his physical skills wielding a blade is rather rookie.
Hiei (Yu Yu Hakusho) is a powerful master swordsman, able to execute mulitple, percise strikes at lightning-fast speed as seen when slashed Seiryu sixteen times in the blink of an eye.
Edelweiss (Rakudai Kishi no Cavalry) is the Strongest Swordsmen in the World known as the Twin-Wings feared at the worst criminal too strong to capture and has a sword skill that is referred to as a godly technique...
...that boasts the greatest attack power, which doesn't leave the tiniest vibration in the air and is sharpness enough to leave a scar in the air creating a vacuum blade.