"I am the demise who comes from the distant summit, the one who splits earth and sky with two blades."
― Edelweiss (Rakudai Kishi Eiyutan)
"Perhaps you would like to learn something before you die. The use of two blades, one to support the other, can be traced back thousands of years and was common to both of our species. The invention of lightsabers has done nothing to lessen the effectiveness of this strategy—as you are about to learn"
The user is capable of wielding two different weapons with ease in combat. The weapons in question are normally bladed weaponry and/or firearms, but it can be virtually any melee and/or ranged weapon. Because of this, the user is able to deal twice the damage to their opponent quickly, swiftly, and effectively. They're also able to hold their own against multiple enemies at multiple angles, allowing them to fight and take advantage of wide openings.
However, due to possessing two weapons at the same time, the user often bears poor defensive skills, so this ability requires speed, power, accuracy, and fast reaction time in order to maneuver through and counter their enemies' attacks in order to make up for the lack of defense.
Revy (Black Lagoon) is so skilled using her dual modified Beretta M92 that she goes by the moniker "Two Hands".
Kamito (Bladedance of Elementalers) dual wielding Est and Restia in their waffe forms.
Jūshirō Ukitake (Bleach) wielding dual blades of his Zanpakutō, Sōgyo no Kotowari, which utilizes its attack reflection ability.
Shunsui Kyōraku's (Bleach) Katen Kyōkotsu is another rare dual Zanpakutō.
Shūhei Hisagi (Bleach) wielding his Zanpakutō, Kazeshini, a pair of dual-bladed kusarigama.
Coyote Starrk (Bleach) using his Colmillo, dual swords composed of spiritual particles.
Ichigo Kurosaki (Bleach) realizing his true Zanpakutō, Zangetsu, which takes the form of dual blades.
Kazuki Mutō (Buso Renkin) using Double Buso Renkin of his Sunlight Heart as a final resort.
Victor Powered (Buso Renkin) taking apart his Fatal Attraction into two smaller tomahawks, each with an energy blade.
Rei Ōgami (Code:Breaker) creating twin blades out of flames.
Yū Kanda (D.Gray-man) using his Two Illusion Blades to create two impossibly sharp spiritual energy blades, one with the sword and one with the sheathe.
Nobume Imai (Gintama) utilizing two blades, a katana and a tantō, to deadly effects.
A dual wielder of swords, Saitou Shimaru (Gintama) is well known in Shinsengumi for his excellent swordsmanship.
Ringo Ameyuri (Naruto) wielding the dual electrical-imbued swords, Kiba.
Jinin Akebino (Naruto) wielding the Kabutowari, which consists of a hammer and an ax.
Kujaku (Naruto) wielding the dual wind-controlling Weaknessless Soaring Shortswords with great efficiency.
The basis of his unique Santoryu/Triple Blade Style, Roronoa Zoro (One Piece) is a supreme master of his original Nitoryu/Dual Blade Style...
...demonstrating his outrageous prowess when he sliced apart a train cart of the Puffing Tom with his Nitoryu Iai: Rashomon...
Kaku's (One Piece) mastery of Nitoryu/Dual Blade Style swordsmanship is nearly on par with Zoro's.
Gekko Moriah (One Piece)
Both a master swordsman and axeman, X Drake (One Piece) dual wields a saber and battle axe as his unique fighting style .
Kinemon's (One Piece) mastery of Kitsunebi Ryu swordsmanship extends to its Nitoryu/Dual Blade Style variation.
Before Zoro, Kozuki Oden (One Piece) was the most powerful master of Nitoryu/Dual Blade Style.
Panty and Stocking (Panty and Stocking with Garterbelt) are highly skilled in dual wielding Backlance, Stripe I, and Stripe II.
Much like their rivals, Panty and Stocking, Scanty and Kneesocks (Panty and Stocking with Gaterbelt) are able dual wield Double Gold Lacytanga and Double Gold Spandex.
The greatest dual wielder of the Chouga tribe, Yo Tan Wa, the King of Death (Kingdom)...
...can instantly deliver death with a wave of her blades...
...decimate entire battalions of mounted horsemen like a speeding bullet...
... and cripple the Eldest brother of the Quanrong and respective dual wielder, Goba with each one of her strikes during their very short duel.
Extremely proficient in the use of his dual swords, Ba Jio (Kingdom) can use swift and powerful, casual attacks against multiple enemies.
A veteran twin-bladed master swordsman, Rin Ko (Kingdom)...
...was extremely skilled in the use of his dual swords...
...easily killing enemy soldiers while in the midst of a duel...
...counterattacking both Ri Shin and Ou Hon while dodging their combo attack...
...and while targeting his opponent's limbs with precision.
Fu Tei (Kingdom) wields his dual swords with considerable flashy skill,...
...targeting his opponents' vital areas with precise slashes.
Shi Ryou (Kingdom) is a powerful dual-wielding master swordswoman of the Ou Sen Army.
A capable swordswoman and the strongest warrior of her village, Kaine (Kingdom) posses the rare talent of using two swords in combat.
Goba, the Eldest Brother of the Quanrong (Kingdom)
Ichirō Ōgami (Sakura Wars) wields twin katanas with ease.
Tokito (Samurai Deeper Kyo) wielding the Hokuto Shichisei, which splits into dual swords she can wield to great effects.
Kazuma Kuwabara (Yu Yu Hakusho) armed with his Double Spirit Swords, though his lack of swordsmanship training renders this more of a flailing move.
Erza Scarlet (Fairy Tail) is a master of dual-wielding swordsmanship.
Archer (Fate/stay night)
After getting her father's missing Scissor Blade back from Nui Harime, Ryūko Matoi (Kill la Kill) became able to wield both Scissor Blades, allowing her to cut and effectively destroy the otherwise indestructible Life Fibers.
After her sword, Bakuzan was broken by her mother, Satsuki Kiryūin (Kill la Kill) wielded it as the reforged Bakuzan Gako and Bakuzan Kōryū, allowing her to cut down and destroy Life Fibers.
Upon transforming into her Sorcerer Mode, Levi Kazama (Trinity Seven) wields twin machetes with dual ninja arts...
...and keeps them in Magus Mode, allowing her to use lighting slash technique to behead her opponents.
Alexander Anderson (Hellsing)
Siegfried (Highschool DxD) is a master swordsman capable of dual-wielding which served as the basis for his Balance Breaker enhanced five sword style.
Hailed as the World's Strongest Swordsman, Edelweiss (Rakudai Kishi Eiyutan) possesses tremendous power and skill in dual-wielding swordsmanship.
Hajime Nagumo (Arifureta Sekai Saikyou) is a tremendously skilled master marksman with his dual revolvers Donner and Schlag.