This trope refers to wielding two weapons at once. After all, if one weapon is good, then two weapons must be twice as good. The tactics can vary widely. A character might be concerned only with offence, and therefore decides that he wants to kill with both hands rather than just one. More tactical characters might typically use their off-handed weapon for blocking or tricky counter-attacks. Game mechanics often grant additional attacks to characters with two weapons.
The types of weapons used can also be diverse. If the character has one hand dominant, he might wield a long weapon in one hand and a shorter weapon in his off-hand, such as a classic rapier and dagger paring. Two small weapons is also pretty common, with the idea that smaller, nimbler weapons won't get tangled up with each other. However, some characters will dual-wield long weapons, such as swords or axes, which is generally portrayed as quite a feat. Mary Sue and Munchkin characters stereotypically wield two katanas. A Bifurcated Weapon might allow the character to switch between one- and two-weapon styles on the fly. On the extreme end of the scale, a character might wield a One-Handed Zweihänder in each hand!
Whatever the weapon, you'll probably see a lot of Flynning and Slice-and-Dice Swordsmanship in the choreography. Two crossed weapons are also perfect for a Blade Lock.
Dual wielding appears in various Real Life cultures and combat styles, but it tends to be over-represented in fiction because it's... well... cool.
A Double Weapon is a variation of dual-wielding in which the character wields two weapons that are attached together. For the firearms variant, see Guns Akimbo. When combined with Guns Akimbo, you get Sword and Gun. When combining Cool Sword with bows and arrows, you get Bow and Sword, in Accord. An easy way to up the ante even further is to be Multi-Armed and Dangerous.
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Anime & Manga
In the FLCL climax, Naota dual wields two guitars in the final fight with Haruko after absorbing Atmosk's power. Wielding Atmosk's Gibson EB-0 in one hand and his own Flying V in the other.
In the Dragon Ball Z film Dead Zone, two of Garlic Jr.'s minions, Nicky and Ginger, can pull two katanas each. Out of their. Freaking. Skin. Sansho may have been able to do that, had his fucking upper torso been blasted off by Piccolo.
Hatsu from Tower of God dual wields Katana. Except that one of them, the Sword That Flies Higher Than Any, really flies around and incepts attacks.
Captains Shunsui Kyoraku and Jushiro Ukitake possess dual zanpakuto. Between them, Kyoraku is the only shinigami that dual-wields even when his zanpakuto is sealed due to the fact that it seals into the form of two swords. Ukitake's zanpakuto seals into the form of a single sword.
Ggio Vega's release allows him to use three blades, one on each hand and one in his hair.
Nnoitra Jiruga releases into a six-armed being that wields a weapon in each arm.
In the final arc, a new dual wielder is revealed. The true form of Ichigo's zanpakuto turns out to be two blades of differing lengths to accommodate his Soul Reaper power (the larger one) and his Quincy power (the smaller one).
Near the end of the series, Gino Weinberg's Transforming Mecha Tristan is upgraded to the Tristan Divider, and its main weapons include a pair of swords that used to be Bismarck Waldstein's mecha Galahad's BFS.
Rolo's prototype Vincent Knightmare had a pair of these that could combine into a double-bladed spear.
Common in Gundam series.
Amuro Ray from the original Mobile Suit Gundam, who would use both the Gundam's beam sabers on occasion. His perhaps most famous instance of doing so is during his duel with Zeon commander M'Quve in the Texas colony.
From Mobile Suit Zeta Gundam, Haman Khan and her Quebley often did this as well, mostly because the Quebley had no other equipment that required hands as it had no shield and all its other weapons were built in (or free-floating) so there was no loss in doing so. Paptimus Scirocco's The O is also notable in that it uses four arms in order to wield four sabers at once (two regular arms and two smaller retractable ones in its skirt armor).
Sandrock in Mobile Suit Gundam Wing uses a pair of heat shotels — a pair of very massive, and very heavy blades — as its primary melee weapons. The redesigned version in Mobile Suit Gundam Wing Endless Waltz has even bigger heat shotels, to the point that they're probably as heavy as Sandrock itself. It still dual-wields them.
In Mobile Suit Gundam SEED, Kira Yamato in the Freedom Gundam tends to dual wield his beam sabers when facing stronger opponents albeit at the cost of abandoning his shield. When he upgrades to the Strike Freedom — which has beam shields built into its arms — he can do this with no penalty. Yzak and Athrun are also prone to this.
Setsuna does this all the time in his Exia (which actually has seven swords, but with only two arms it can't use them all at once).
The 00 Gundam can do this as well. Like the Exia, it can dual-wield beam swords but also can dual-wield a pair of similar sized solid swords that also act as a pair of laser rifles.
The absolute nadir of this trope is the Seravee variant that appears in the manga. It has three Seraphim units attached to its back, all of which are capable of fighting independently. When attached to Seravee, they can each pull out two arms, meaning that Seravee can wield a total of 10 beam sabers at once.
Mobile Suit Gundam AGE: AGE's Asemu Asuno dual wields beam sabers as his favored combat style, against his father Flit's rifle in one hand and saber in the other, and his son Kio's using a two handed rifle. After he upgrades to the Double Bullet he gets beam sabers installed in the shoulders allowing him to quadruple wield. After the time skip as Captain Ash, his new Dark Hound dual wields a spear and saber.
Unsurprisingly, the Mazinger series were the ones introduced this trope in Humongous Mecha anime.
Mazinkaiser can deploy two "Kaiser Blades" from its shoulders. By all appearances they're broadswords.
Getter Robo: Getter Robo G's Getter Dragon form dual-wields battleaxesGetter Tomahawks for the Double Getter Tomahawk attack. It even throws them for the Double Tomahawk Boomerang! This goes double for Getter Robo Armageddon's Shin Dragon!
The anime of Murder Princess often has the titular character dual-wielding a katana and a dagger.
And for some strange reason, the titular protagonist of Monster Princess does lots of this too. (Of course, she also wields chainsaws and jackhammers as befits the situation.)
Although he does have a bow, and some ridiculously powerful Trick Arrows, Archer from Fate/stay night more often fights with two Chinese dao, Kanshou and Bakuya. Later on, Shirou uses Projection magecraft to make copies for himself. (It's usually around this point that fans start to wonder at the many similarities between Archer and Shiro...)
In Fate/Zero, Servant Lancer initially appears dual-wielding spears, although he generally fights with only one at a time (in one occasion, the shorter spear which he left on the ground was used in a surprise attack). Also, Servant Berserker (The Atoner Lancelot) manages to ward off Gilgamesh's "Gate of Babylon" using a spear in one hand and a sword in the other.
Nanami faces the Ohtori duels with a scimitar and curved dagger. She only has the sword during her duel in the third arc, however; if you think of the sword/dagger combo as representing Touga and herself, then it makes sense as her relying purely on her own strength in that fight.
Later, her Stalker With A Crush Mitsuru Tsuwabuki "borrows" said sword and dagger in his Black Rose duel. And he's frighteningly good at using them.
Roronoa Zoro often triple-wields katanas, with one in each hand and one in hismouth. This being anime, of course, it's always quite effective, as absurd as it would be in real life. It goes even farther, however, with Zoro eventually learning to nonuple-wield — that is, use nine swords at once, or at least create the appearance of this.
Not long after meeting Zoro, and long before Zoro's nontuple-wielding, Captain Kuro is seen wearing gloves with katanas on each finger. Combined with his incredible speed, he attempts to defeat Luffy, killing off or severely wounding most of his own crew, in order to carry out his master plan.
Hatchan (an octopus fishman, meaning he has two legs and six arms to match an octopus's eight tentacles) uses six swords at once.
CP9 member Kaku uses two swords, and thanks to a special technique his legs act like blades making a total of four.
Mr. 1 is literally made of steel and can make blades appear from his body.
Flower Sword Vista of Whitebeard's crew is notable for actually using just two swords, not three or six. He is a very strong swordfighter, able to be recognized by Mihawk, the strongest swordsman in the world, who said that among swordsmen only a idiot wouldn't be familiar with Vista.
It's so absurd and unpredictable that even the Sharingan can't properly predict every attack.
Father Anderson of Hellsing, Ciel of Tsukihime, and Kotomine of Fate/stay night fight with thin swords held between their knuckles, up to a total of six. (Mai-Otome pokes fun at this by having Yukariko do it with chalk. In both that series and Mai-HiME, she often uses a bow and arrows.) This seems to be some kind of Church Militant ability, as all three characters are associated with the Catholic Church (notably, the second two are members of the same organization, though vastly different rank).
King Bradley does this in Fullmetal Alchemist, using two sabers at once. Sometimes he carries multiple extra swords, so that he can keep dual-wielding even if one or more of his swords get broken. This is also parodied in an omake, where King Bradley wields five sabers at once: one in each hand, one in each ear, and one in his ass. Denied, his saber, he then dual-wields a set of trench knives.
Akane Higurashi from Mai-HiME, wields a pair of tonfa as her personal weapon. In her case however it's totally justified; tonfa, being both offensive and defensive armaments, are one of those weapons which are intended to be dual-wielded even in real life.
Shinomori Aoshi gets an upgrade to dual-kodachi disguised as a single nodachi like this one◊ the subterfuge befitting his onimitsu (ninja/spy) heritage.
Aoshi's "mentor" Okina, wields a pair of tonfa (which is of course justified, see above).
Undine of the Twin Swords from Claymore is (of course) well known for the massive physical power that lets her use two standard issue BFS' at once. Upon her demise, Deneve took up her blade and spent the Time Skip learning to bulk herself up to pull the same trick.
One of the myriad forms of the Ten Commandments in Groove Adventure Rave is Blue Crimson, which splits the weapon into two different swords: one of fire and one of ice. Interestingly enough, the hero finds it somewhat difficult to use because he's right-handed.
Viral has a mech that dual-wields katanas. Later, he pilots a mech that quadruple-wields them, and LATER, he gives the Tengen Toppa form of Gurren Lagann the ability to create and dual-wield katanas.
Gurren-Lagann is also seen dual-wielding giant sunglasses/boomerangs or drills for some of its attacks.
Tengen Toppa Gurren Lagann wields two Giga Drill Breakers in the final battle against the Anti-Spirals.
In the second movie, The Lights in the Sky Are Stars, Viral's Tengen Toppa Gunmen, Tengen Toppa Enki Durga wields eleven swords (and a club).
Akira of Samurai Deeper Kyo uses two katanas. Later, during Akira's fight with Tokito, her sword splits into two swords.
In Vinland Saga the hero Thorfinn fights with a pair of daggers. Not particularly strange, pretty reasonable. Contrast that however with his first major opponent and secret great uncle. Thorkell the Tall, who dual-wields axes. Not just any old normal sized axes, big mo' fo' great axes almost as big as the hero.
Some of the weapons provided by the Gold Cloth of Libra in Saint Seiya, such as the tonfas and the nunchaku, are meant to be dual-wielded. The Andromeda Cloth also wields the Andromeda Chain — one type of chain on each arm, and Shun can whip them out simultaneously to attack, unless the enemy requires more thoughtful tactics. Somehow, they never become entangled with one another, and Shun can wield them easily despite being the youngest, wispiest Saint ever.
Guitar, the dog/deer swordsmaster from Violinist of Hameln, wields at least four swords at once, holding a pair in a claw-like grip in each hand. He's murderously proficient with this style.
The title mech from Kurogane no Linebarrel. This is made notably less impressive when the soon-to-be-lancer starts quad wielding (and even then it has another sixteen swords to rely on), then there's Tsubaki-hime, that can dual wield chainsaws.
Daipenmon dual-wields popsicles. It even has a special attack for each of them — Strawberry Death for the red one, and Blue Hawaiian Death for the blue one.
Lobomon dual wields light sabers (which can be combined to one two bladed lightsaber darth maul style) and some other sword wielding digimon like Karatenmon, Dinohumon, Yasiamon, Zanbamon and many others.
The Hidden Weapons Master Mousse keeps a rather improbable number of weapons (bladed, blunt, piercing, etc.) hidden within his clothing and all over his body. A favorite intimidation tactic consists of him whipping up both his arms and displaying a frightening amount of blades from his giant sleeves, making it look like the swords and knives are his actual hands. And he's good at using them.
Shampoo also regularly dual-wields chúi, large Chinese maces. These demonstrate her prodigious strength, as they are known to be unbelievably heavy and unwieldy, yet she swings them around like they were nothing.
Kodachi has been shown to use multiple clubs at one time.
Ukyo uses both her large spatula and smaller spatulas at one time, though the smaller ones can double as projectile attacks.
In GUN×SWORD, Dann of Thursday uses a massive katana with a detachable knife (or presumably a wakizashi) attached to the reverse side. Van uses it occasionally to take on multiple enemies, while a twin-bladed mauling (Daitou Renzoku Kougeki, or Greatsword Multiple Attack) is one of Dann's attacks in Super Robot Wars K.
Genkishi, the Phantom Knight of Katekyo Hitman Reborn! carries around four swords at this belt and usualy dual wields two of them. Adding on to this, Yamamoto Takeshi's box weapon is in possession of three swords, carried on it's back. What makes this more interesting is that the box weapon is, in fact, a dog.
Somewhat avoided in the Takehiko Inoue-drawn/written manga Vagabond, with two exceptions where it was acknowledged: Musashi used it as a reaction to being outnumbered by four senior disciples of the Yagyuu, and then he uses it to surprise the chain and sickle wielder Shishido Baiken (Tsujikaze Kouhei, who'd killed the original Baiken) and defeat him. Apparently Musashi is the only character to dual-wield in the manga because he's so strong that dividing his strength between the two swords isn't a problem, as he proves when he uses a one-handed sword to break a katana held in both hands.
Gintoki does this for a while against Housen in Gintama.
Hayate × Blade gives us Jun, the only student granted the right to use two swords; Shizuku, who wields her partner's sword sheath in addition to her own sword during the council battle; and Maki, who has not been shown Dual Wielding per se but can be inferred to have the ability to do so because of her ambidexterity.
The titular character in Afro Samurai, who wields a single katana fights a dual wielder, and ponders briefly on the technique's worth. He decides on balance a single blade is better, but the fight is inconclusive.
Mifune from Soul Eater carries multiple swords. Usually he uses one sword but he does multi-wield we he gets serious. Kid dual wields guns, and appears unable or at least very unwilling to use only one of the two.
Tsunashi Takuto, the protagonist of Star Driver, reveals that he is a dual-wielder in an I Am Not Left-Handed moment, specifically of swords. When piloting Tauburn, he dual-wields two "Star Swords" - mecha-scale swords made of pure light/energy (the anime never goes out of its way to explain the composition of the weapons) - Emeraude (green) and Saphir (blue).
In Tokko Kureha wields a twin pair of daggers. In the Manga, Ranmaru gets two swords when he awakens his powers, but in the anime version he only gets one, but dual wields his and Sakura's swords in the final battle.
Chikuma Koshirou from Basilisk dual wields two kama scythes.
Played surprisingly realistically in Sword Art Online. Most people can't use two swords, even though most games let you do that due to Rule of Cool. Only one player manages to earn an extra skill that lets him do so, the main protagonist, Kirito. He doesn't know how he earned it, though much later it's revealed later that the skill is awarded to the player with the fastest reaction times in the game, and is intended to mark The Hero in the game's metaplot.
In later games after SAO, Kirito still retains the skills (not the actual game skill, which was removed) to dual wield effectively, but doesn't until he gets serious in a fight.
Dual wielded swords are the standard issue weapon in Attack on Titan; justified by how soldiers are not fighting against other human(or -like) beings with weapons but rather toweringly-humanoid Titans with Titans' weak point being a portion of flesh that requires two blades to cut away, rendering the risk of two swords getting tangled while using them in combat irrelevant.
Nightcrawler from X-Men is known as a swashbuckler being able to dual-wield sabers. He can even triple wield, when using his tail to hold a dagger. That being said, he's literally got superhuman agility and acrobatic ability.
The six-armed X-Men villainess Spiral. Predictably, she wields six swords, usually of varying lengths.
The short-time X-Man Marrow also is known for her tendency to dual-wield her self-made knives or clubs.
Deadpool frequently wields dual blades of various sorts. He generally has two katanas strapped to his back, which he can use together, but also varies it up with a katana-and-sai combination (e.g. that Cable & Deadpool cover with Deadpool and Spider-man) or pretty much anything around. Usually he's got at least three to four blades on him at any time, along with the guns, grenades, and other various weaponry. (The cover of Wolverine #88 shows him skewering Wolverine with both katanas.)
Miho in Sin City often uses a katana in concert with a wakizashi.
'Shorty' the dwarf in Skullkickers wields two axes. Sometimes he uses only one, with the other as a back-up in case the first gets stuck in a guy; other times he just uses both at once. The axes in question are small hatchets, quite realistic for either purpose.
In Rat Queens, Violet and Betty both dual-wield. Violet has twin wakizashis as a backup weapon, Betty uses daggers.
In The Wizard in the Shadows, Emrys pulls this off and it becomes his favoured style, but only after unlocking his abilities as something that is effectively part angel under extreme stress, giving him greatly enhanced physical abilities, and solving the coordination problem. Before, both times he uses two swords, he uses them sequentially, using the first blade to wound and the second one to kill.
Similarly, in The Immortal Game, during her final duel with Titan, Twilight wields both her own blade, Equinox, and Rarity's, Vorpal due to Rarity being incapacitated and near death.
The Powers Of Harmony: Ace and his predecessor Cancer is capable of using his telekinesis to wield four blades at the same time.
Luna/Nightmare Moon has the twin Lunairium blades Perigee and Apogee.
In Horseshoes and Hand Grenades, Gentaro gains two blades when he uses the Circinus spell (one that extends to far lengths, the other creating Fireballs), and Shun has two pata bladesnote a gauntlet with a blade fused to it, after making a contract and becoming a Serpent-bearer to Vasuki.
Films — Animation
In Princess Mononoke, Lady Eboshi uses a sword and a hairpin in her fight with San. And it works.
Darius in Dragon Hunter can not only dual-wield but fight off multiple people at once with two swords.
The Star Wars prequels added this to the film series.
Anakin fights with two lightsabers at once for a brief moment against Dooku.
General Grievous fights with two lightsabers, and then with four lightsabers for a brief period, but quickly gets cut back down to two.
In the first Narnia movie, Aslan's Bad Ass right-hand centaur fights using two longswords. Jadis, the White Witch, wields a longsword and a wand, which turns people to stone. She picks up another longsword when the wand is broken. In the book, she uses a stone knife and her wand. Edmund fights with two swords during the final battle of Prince Caspian.
Gandalf is shown swinging his staff and his longsword against the invading enemy, including a nice twirl of the staff before smacking an unfortunate Orc with blade and blunt.
Legolas's other weapons (besides his bow) are twin fighting knives. The actor claims he actually became more proficient with that than with his bow.
In The Fellowship of the Ring, Saruman dual-wields his own staff and Gandalf's briefly.
Éowyn briefly uses two swords on horseback (with Merry holding the reins) to good effect against the Mûmakil outside Minas Tirith.
Sam wields a sword and a frying pan in Moria (at least one shot, after Frodo is hurt, seems to show him using both at once). Later, when he stormed the tower of Cirith Ungol, he wielded Sting as well as his normal sword.
In some of the fights Gimli wields two axes (occasionally throwing the smaller off-hand axe), in the other fights he "just" wields a double-headed battle axe.
In The Hobbit, Thorin can be seen wielding both a dwarf axe and the sword Orcrist. Dwalin is also well-known for dual-wielding his prized axes "Grasper" and "Keeper".note As explained by Graham McTavish, who named them, "one grasps your soul, the other keeps it." Fili and his twin swords.
In Tim Burton's Sleepy Hollow, the Headless Horseman, shortly before he becomes headless, fights some American soldiers with a sword and a hatchet. He seems to parry with both weapons and use both weapons to deliver decapitating blows. Of course, he's just that badass. And, later, Brom is shown fighting the decapitated Christopher Walken using two sickles.
Used briefly in Kingdom of Heaven by Guy de Lusignan. Then he loses one sword and pulls a dagger...
During the battle scene in the later half of Beowulf, soldiers are seen dual-wielding axes.
In the final battle of Shanghai Knights, the villain Lord Rathbone (named for the great actor and swordsman, Basil Rathbone) dual-wields a rapier and a saber against Jackie Chan (who just has the rapier).
In the movie adaption of 300 Xerxes's elite, the "Immortals" dual-wield scimitars, as opposed to the comic in which they are armed primarily with shield and spear.
In the final fight of the Sci-fi Channel original movie Thor: Hammer of the Gods the only thing NOT dual-wielding is a wolf.
Transformers: Optimus Prime, of all people, gets to dual-wield superheated retractable blades in the sequel. (He only had one in the first movie.)
In The Mask of Zorro, both Diego and Alejandro with the crappy Zorro costume do it with a sword and a knife. Later, Alejandro, this time with the official costume, does it with two swords against Montero and Love.
Machete wields a pair of machetes against Torrez, who uses a katana and wakizashi.
Done semi-realistically in the 1952 Ivanhoe; Ivanhoe uses a dagger in his left hand whenever he fights. Also, in the 1997 miniseries, Bois-Guilbert briefly dual wields an axe and sword during the trial by combat.
In The Mummy Returns Princess Nefertiri/Evy and Anck Su Namun fight with dual sai type daggers.
When Will and Jack first meet in Pirates of the Caribbean: The Curse of the Black Pearl they engage in a duel. At one point during the fight, Will has two swords for a short period. Justified, as they're in the blacksmith's and there are plenty of swords about the place.
Seen in this Russian movie called Save the Emperor about the Russian Revolution and Civil War. The Cossack character in red in a frenzied attack against Red forces, briefly used two sabers to slash down the Reds. .
Several characters in King Arthur (2004) dual wield weapons.
Lancelot is the only one who dual wields swords. His swords are notably smaller than the broadswords used by Arthur and Dagonet.
Bors uses two curved knives. Though he might also use a single battle-axe.
In The Dresden Files: Small Favor, Michael dual-wields a broadsword and a katana. And they're holy swords, too! It's a total cop-out that the villain beats him with a gun, but at least he ends up Not Quite Dead. He did it in Death Masks, too. Same cop-out gun victory, too, but that time it was just a handgun and there was Kevlar plating in his armour.
Drizzt Do'Urden, the drow ranger from the Forgotten Realms books, uses twin scimitars. Using two long blades is more common for drow than other races, who don't necessarily consider it a plausible option at all. Several characters note that Drizzt risks getting his blades tangled up using his style, but he's just that good. Drizzt seems to have popularised the idea at least to some extent, to the point that when there was an open call for original Forgotten Realms novels by fans, the best of which could get published, the things forbidden in the rules included drow characters and anyone wielding two swords of any kind. Drizzt's arch-nemesis, Artemis Entreri, also dual wields, but uses a dagger in his off-hand, lacking the agility and coordination to wield two long blades.
RA Salvatore's Crimson Shadow trilogy features the Highway Halfling Oliver De Burrows wielding the more traditional rapier and main gauche.
In Terry Pratchett's Thud!, Andy "Two Swords" Jackson is an overly enthusiastic Ankh-Morpork Auxiliary Watchman and weapon enthusiast who dual wields two non-standard issue curved swords to great effect, though occasionally causing collateral damage.
In the Deryni novels, Alaric Morgan habitually wields a sword in his right hand and a stiletto in his left. In Deryni Checkmate, Duncan is depicted using both a sword and a dagger when he rescues Morgan from Warin and his men at St. Torin's shrine.
Kalam Mekhar, an assassin, dual-wields long-knives.
Silchas Ruin, a dragon-blooded immortal, dual-wields two swords. That is, when he doesn't just transform into a dragon...
The Segulah. Their entire culture dual-wields longswords.
Leoman of the Flails wields two flails.
In Cloud of Sparrows, Shigeru's ability to fight with two swords is a sign of his unusual skill and strength.
This is a common fighting style of Dragaerans in Steven Brusts's Dragaera books, with a dagger in the off-hand. Eastern-style fencing, on the other hand, involves using a single light rapier and turning your body sideways.
On Barrayar, in the Miles Vorkosigan series, the Vor traditionally carry two swords, and dueling with two swords is mentioned as being specifically illegal. The two swords aren't described in detail, but one is shorter than the other (it's noted at one point that Miles finds the longer sword of the pair a particular trial (he's very short).
Heralds of Valdemar: Weaponmaster-Herald Alberich dual-wields two daggers in one of his undercover personas. Until people wised up and quit challenging that persona to fights, he routinely beat sword-wielders with his two daggers. He also dual-wields sword and dagger in the climax of Take A Thief to beat three swordsmen, though he had help from Skif in that fight. It's also pointed out in Exile's Honor that Alberich is a combat prodigy and has been taught how to fight with nearly every weapon created and some that haven't been. Another dual-wielder in Exile's Honor (one good enough to even impress Alberich) is MindHealer Crathach. When he demonstrates his skills for Alberich, he immediately finds himself part of Sendar's battle guard.
The Casseline Brotherhood in Kushiel's Legacy dual-wield daggers as standard practice for defending their charges in close quarters or when they want to inflict non-lethal injuries. Their (two-handed) swords are only ever single-wielded and drawn only to kill.
This is whole premise behind the hotas of the knife dancers in Karen Miller's Godspeaker Trilogy, as well as acrobatics. Rhian modifies this and uses broad swords.
The Wheel of Time has one of its major characters do this. In a more unique twist though Perrin eschews swords in favor of a battle axe and blacksmith's hammer. When one considers the weight of just one of these weapons it says a lot about how strong the character is. The choice nearly gets Perrin killed though, since even he can't swing as fast as a good swordsman.
Alaric briefly uses both an axe and a hammer in Hammer of Daemons. He isn't the only one running around with multiple melee weapons, though.
Jean Tannen, Gentleman Bastard, dual-wields the Wicked Sisters, two short axes. It's briefly mentioned that his partner Locke carries two knives on his person, but he's not nearly as much of a brawler so they don't show up too often.
Piers Anthony's post-apocalyptic collection of novellas, Battle Circle, features dual wielding nomads with daggers and sticks. Interestingly, Piers rates each weapon (including staves, swords and morningstars) on defensive and offensive utility.
Scythe-arms in Chronicles of the Kencyrath by PC Hodgell are blade pairs attached to the fore-arm, with the longer blade jutting forward and the other back. They are used in pairs, ie one main blade and one spur on each forearm. Training with them easily dissolves into chaos, with inexperienced users not being able to keep track of the spurs.
Mewick, a fairly minor character in Fred Saberhagen's Empire of the East, at least twice used a short sword in his right hand and a "basket-hilted hatchet" in his left. He managed to swing the hatchet around the guard of one highly skilled enemy swordsman to strike the man in the spine.
In the Redwall book The Bellmaker, the otter Finnbarr Galedeep had twin swords.
Catelyn recalls seeing Bronn fight with a sword in each hand while chopping through clansmen on the Mountains of the Moon. She's reminded of Jaime Lannister, reputedly the best swordsman in the kingdom.
Shagga fights with an axe in each hand and acquires three axes from the Lannister armory before a battle. Tyrion explains that Shagga believes that two axes are better than one, and three are better than two.
Daario Naharis apparently dual-wields his arakh and dagger. They have matching hilts carved into the shape of naked women, and his hands frequently caress each of them when he's getting ready for a fight.
In Codex Alera, this is Kitai's preferred fighting style, usually with a shortsword and a longer sword.
The Okar (Yellow Martians) from John Carter of Mars dual wield a fairly ordinary sword and a hook-sword designed to disarm an opponent as their standard technique.
In The War Gods series, Champion Kaeritha dual-wields custom-designed short-swords, a feat aided by the fact that she is fully ambidextrous. Just how good she is can be seen by the fact that when she practiced against a group of Hradani (the smallest of whom was twice her size and far stronger), she trounced all but one of them. Her style is notably different from the War Maids who use a sword-and-dagger combo.
In Darth Bane, Bane's lightsaber instructor in the Brotherhood of Darkness mentions all of the downsides of Dual Wielding to discourage his students from learning it. Said instructor is a master of dual wielding himself. This isn't hypocrisy; he just wants to have an advantage in case he ever has to fight his students to the death. A reasonable concern given that they are all Sith. Bane is quickly overwhelmed during their duel because he doesn't know how to handle a dual wielding opponent so he uses the Force to bring the ceiling down on his former instructor.
In One Good Knight, Adam and Gina specifically teach the Sworn Sisterhood to fight sword-and-dagger, rather than sword and shield.
In Mother of Demons the standard weapon of a battle-mother is a mace and shield. However, Guo fights with two maces.
Tobimar in Phoenix Rising fights with two swords. When he meets another character that also fight with two swords and in the same style, they immediately explore their respective training backgrounds.
The Stormlight Archive: It is apparently possible to dual-wield Shardblades, assuming you could acquire two Shardblades in the first place.
A Mage's Power: Aegis dual wields buckler shields and Raki dual wields short swords. They regularly duel.
Kyoryu Sentai Zyuranger: Dragon Ranger dual wields his Zyusouken (Dragon Dagger in Mighty Morphin' Power Rangers) and Sword of Hellfriede (Sword of Darkness in MMPR) against Tyranno Ranger, who counters with his Ryugekiken (Power Sword) and Ranger Stick (Blade Blaster). Later, after inheriting his brother's powers, Armed Tyranno Ranger uses the Ryugekiken and Zyusouken together. This carries over to the U.S. version in both cases.
Chouriki Sentai Ohranger: OhBlocker, the team's second five-piece mecha, has two swords that combine into a BFS made of energy that is as long as it needs to be... but is so heavy that it's not wielded so much as formed above the monster and allowed to simply fall, slicing through.
Mahou Sentai Magiranger: Wolzard has a sword in monster and Ranger form. He can use both at once, and has one attack that requires it (which he teaches his son The Hero, who does it with his standard Ranger form's sword and his Super Mode's staff.)
Kaizoku Sentai Gokaiger: The Gokaigers dual wield a gun and sword by default and are known to swap weapons in the middle of combat. Blue and Yellow often end up Dual Wielding the swords. This was taken to an extreme when Gokai Blue ended up wielding all five swords at the same time, very effectively at that.
Kamen Rider Gaim often dual wields his Musou Saber and whatever Arms Weapon he has access to. Several other Riders also dual-wield, including Kamen Rider Bravo, who has the twin Duri Noko.
Merlin: In the British TV show, some mooks are seen using dual scimitars (and one knight who wanted to join the knights of the round table used two longswords).
In S3E11, whose premise is a tournament which anyone can enter, we see a dual wielding ninja-like warrior going up against Arthur briefly. Deconstructed: after a brief but impressive display of spinning swords by the ninja, Arthur punches him in his (undefended) face and knocks him down, winning the fight.
Robin of Sherwood: Nasir the Saracen dual-wields scimitars, but these are weapons with thin, relatively short blades. In the pilot he manages to fight Robin, only using one sword, to a stand-still.
Spartacus: Blood and Sand: Theokoles, The DreadedEvil Albino gladiator, wields two swords as part of his fearsome persona. Later, Spartacus is explicitly trained to wield two swords to mimic Theokeles and excite the crowd. This is also Gannicus' preferred fighting style, which helps portray him as the hottest hot-shot of his era.
Star Trek: The Next Generation: In the first episode with Lt. Barclay. In one of his holodeck fantasies, he is fighting with a sword in each hand against holodeck versions of Riker, Data and Geordi - at the same time!
Dungeons & Dragons features specific and explicit rules on dual-wielding that vary depending on the edition.
AD&D's first and second editions allowed you to dual-wield melee weapons and make two attacks per round, provided your off-hand weapon was smaller than your main weapon, and your attack rolls with both were made at penalties of -2 and -4 respectively. This could be offset with a good Dexterity score, which lowered your penalties based on your ranged attack modifier. Second Edition's Player's Options (Combat and Tactics and Skills and Powers, as well as the Complete Fighter's Handbook) added Weapon Style specializations and Ambidexterity, which when put together could eliminate all penalties for dual-wielding and even allow you to wield two same-length weapons at once with a second specialization, provided you could wield them with one hand. Rangers also receive bonuses for dual-wielding.
In the 3.0 and 3.5 editions, characters receive heavy penalties when attacking with two weapons. You can receive lower penalties by using a light weapon in your off-hand or by using a single double-headed weapon. Several feats can be taken to lower your penalties further. There are specialized weapons for certain tailed races that can act as a second or third equipped weapon with special training.
As of 4th Edition, holding a weapon in each hand doesn't allow you to make two attacks by default, but certain feats give you benefits for dual-wielding, and quite a few Ranger powers require you to dual-wield. And Fighters have gotten into the act as well with the Tempest build from "Martial Power", which gives dual-wielding powers to the Fighter, and which, with a Ranger multiclass feat, can even wield two one-handed weapons like the Ranger can (since Fighters are usually limited to two light weapons or a one-handed weapon and a light weapon).
Done with swords, axes, chainsaw swords, chainsaw axes, powerswords, giant hammers and enormous bladed claws that shoot lightning in Warhammer 40,000. Either this or Sword and Gun, with a pistol in one hand and a blade in the other, is used by virtually all close combat troops in the game. A few even use Guns Akimbo (including a pair of flamethrowerpistols.
Both the Warhammer roleplaying games (WFRP and Dark Heresy) permit this as well; however, this does not give you any extra attacks — the off-hand weapon is mainly used for parrying (much like in real life). Skaven characters in Warhammer fantasy can even triple-wield by holding certain specialized weapons in their tails, but they must be trained.
Dual-wielding in Dark Heresy does give extra attacks if the character has the right mix of Talents, for a maximum of four every turn.
In warhammer fantasy battles extra weapons gives extra attacks though. Special mention to warriorpriests that dualwields hammers rather than the normal axe or sword combos and ogres who dualwields clubs.
You can do this in GURPS for a large penalty (which can be bought off in cinematic games). You can hold a weapon in each hand and attack with them one at a time for no special penalty.
Feng Shui, in contrast, does not give you any penalties at all for Dual Wielding any kind of weapon due to the game running largely on the Rule of Cool and the fact that many heroes in both kung fu movies and Heroic Bloodshed liked to dual-wield weapons. Golden Comeback, the Dragon supplement for the game, allows you to use many of the gun schticks in the original book for melee weapons if you're not a guy who uses Ki Attacks like the regular martial artist, meaning that you can use the schtick normally reserved for Guns Akimbo against named characters, Both Guns Blazing, to lay on the hurt using two swords or other melee weapons.
Exalted typically averts this, which is slightly odd given its strong anime influences. Wielding two weapons doesn't give you an extra attack unless you use a flurry, which you can do just as easily with one weapon. Those trained in the Fire Dragon style of Immaculate Martial Arts are the exception, who wield two (relatively, in comparison to the BFS most Exalted wield) short blades.
Short and hook daiklaves, which Fire Dragon stylists use, are designed explicitly to be dual-wielded, and are usually found in matched pairs. Possibly in someone's ribcage.
Warmachime: Vladimir Tzpeski, the dark prince of Umbray, in ]] dualwields a sword and a twin-bladed dagger. As do Supreme Archdomina Makeda, Tyrant Xerxis and all the skorne Praetorian swordsmen.
BIONICLE has many examples. The original six Toa had one weapon each, but with their Nuva upgrade all of them suddenly wielded one weapon in each hand. Kopaka takes the price here: because his original form already carried a shield as well, his new weapon form thus meant that he had a Double Weapon in one hand and the upgraded shield in his other! The focus on Dual Wielding and Double Weapon continued into the Metru line of Toa, where Vakama was the only one to carry a single weapon (though it was a projectile launcher to make up for it). In their mutated forms, they were all Dual Wielding again. The next few years began putting more focus on projectile weapons, thus having everyone start using the Sword and Gun setup instead, with at least some of the villains taking this trope to its logical conclusion and carrying two blades plus a gun. Kongu, however, took a slightly more realistic route and at least threw away his newly transformed melee weapon so he could carry two Cordak missile launchers instead.
In Knights of the Old Republic and its sequel, any character except Kreia after she gets her hand chopped off can dual wield one-handed weapons. While the game doesn't allow for Sword and Gun, you can bring Guns Akimbo (even T3-M4, the game's Shout-Out to R2-D2, can do this) with dual pistols or dual wield 2 full-sized melee weapons. However, you take a penalty unless you invest in character perks, and an additional penalty unless you use a "balanced weapon" (generally a "short" variant of the lightsaber or vibroblade, or a smaller pistol) in your off-hand.
A bug will occur if you equip a lightsaber and a vibroblade dual-wielded. While it has no impact on game mechanics, the vibroblade will make the iconic lightsaber sounds instead of the sword sounds.
The Tales Series
Lloyd in Tales of Symphonia. Actually lampshaded, as Kratos mentions how using two longswords goes against what the art of the sword is about, and Lloyd reveals that he's using them simply because of the Rule of Cool — as the opening quote makes apparent, he thinks more swords means more power.
In the sequel, Dawn of the New World, Richter uses a single-edged sword and an axe.
Judas in Tales of Destiny 2 dual-wields a sword and a slightly long dagger. Later, in the prequel remake, Leon Magnus follows the suit, because he technically is Judas.
Spada Belforma, Tales of Innocence's lancer, dual-wields the same way Lloyd does, but is more serious about it than his predecessor.
Kunzite of Tales of Hearts wields two katars. And has two additional blades mounted on flexible arms sprouting from his back. Chlorseraph, an early boss in the second half, also dual-wields giant green cleavers, and later teams up with his twin brother Clinoseraph, who dual-wields shields. Chalcedny, near the end, gets away with wielding a shortsword in one hand and, somehow, his trademark BFS in the other.
Ludger from Tales of Xillia 2 starts off wielding a pair of swords before he gains the ability to switch to other weapons. His older brother Julius does the same, and is the one who taught him his fighting style.
In the Disgaea series, all the prinnies dual-wield daggers for their basic melee attacks.
Disgaea 4 allows the dual-wielding of Magichange weapons. Any combination of sword, spear, staff, axe, fist, gun or bow can be used together, and it tends to look even sillier with giant magichange weapons, which are much larger then the wielder.
Persona 4's Yosuke uses small weapons in each hand.
We say "weapons" here, because they can include everything from machetes, to kitchen knives, to pipe wrenches. (The last of which are actually are a good choice early on in the game, thanks to a nice critical-hit bonus.)
In Persona 2: Eternal Punishment, Baofu technically dual-wields coins. (Which may sound improbable, but when you consider that they're thrown with the force of a bullet...) In both versions of Persona 2.
Vyse in Skies of Arcadia uses dual cutlasses. Because he's a pirate. The second sword, however, is a tonfa-like weapon that isn't used in normal attacks.
The Genji Glove item sometimes gives the equipped character the ability to do this. In Final Fantasy VI, the character could also equip the Offering (otherwise known as the Master's Scroll) for quadrupling the number of hits, yielding a total of eight strikes per turn. Each hit only deals half the regular damage...except there are 4 weapons immune to this: The Fixed Dice, the Dice (which you can buy freely,) the Valiant Knife, and the Ultima Weapon. Toss in the spell Quick, which gives a character two actions in one turn, and you get sixteen full-power hits at once, and can say goodbye to the Final Boss pretty quickly.
A similar trick to the FFVI example existed earlier in the series; in Final Fantasy V, the Ranger's "Rapid Fire" skill, which attacks four times, allows for eight hits (again at half power) when paired with the Ninja's ability to dual-wield.
There are even some FF games where everyone can dual-wield. In Final Fantasy II, dual-wielding is very powerful but not advisable long-term, as you'll be leveling up only attack and not defense. Conversely, Final Fantasy III for NES has no penalties for dual-wielding, and shields are weak anyway, so it's always advisable. Final Fantasy XI goes nuts with this, having players not only get Dual Wielding, but also one of the best defensive spells in the game through the Ninja job. And with Dual Wielding being more effective than 2-handed weapons by a large margin, until a certain patch...
It's also inverted in Final Fantasy II, as a pure caster is advised to dualwield shields.
In Final Fantasy III, it's utterly broken...and probably explains why usually only Ninjas or certain characters can Dual-Wield in future games. (With a few exceptions). Just about every single weapon in the game can be dual-weld...sure fists it makes sense, and knifes and swords, but characters will eventually start getting insane amounts of hits with bells, books, staves, and even Spears. Yes, even staves and spears can be dual-wielded.
Zidane from Final Fantasy IX equips knives and swallows. Whenever he equips a knife, he wields the equipped weapon in one hand and pulls out another basic knife to wield in his other, sort of hitting with both daggers at once. (It's just for show — you can't actually dual-wield two different knives.)
Judge Gabranth from Final Fantasy XII dual-wields a sword and dagger that combine into a sweet bladed staff. In fact, dual-wielding seems to be the de facto Archadian Elite fighting style. All of the Judges Magister, as well as Larsa Solidor, never go into battle without an ornate sword/mace/measure in each hand.
Final Fantasy Tactics Advance has a passive skill for dual-wielding, but only Humes can learn it, and it's the most expensive one in terms of AP. On the other hand, it also allows you to learn two skills from weapons at once. For some reason, the sequel also allows all characters to dual-wield shields (if they could use shields at all). This can be surprisingly useful for mages.
Dual-wielding while using the opportunity command, Flurry!, can make your unit hit the enemy four times since the action is two hits and the other two hits are from your dual weapons.
In Final Fantasy Tactics, ninjas can naturally dual-wield, and have an ability that can be learned so a character can do it even in other classes.
The Thief Dressphere in Final Fantasy X-2. While not the strongest, she can chain two attacks together.
Gilgamesh from FFV and FFXII septa- and octa-wields weapons. Its effectiveness is... unsurprising.
In Final Fantasy VIIAdvent Children, Cloud owns six swords (none of which could exactly be described as small) which are stored in his motorcycle. These Fusion Swords are variously used singly, dual wielded in pairs, or locked together to form even bigger swords.
In Bravely Default, all characters can dual-wield weapons, but only the Ninja job can do so naturally without suffering an attack penalty.
Example of sword and dagger: the Prince in Prince of Persia: The Sands of Time. The dagger in this case is the Dagger of Time and is the only one to off enemies for about 90% of the way.
Prince of Persia: Warrior Within. Here the Prince wields a permanent sword in one hand and can pick up a variety of swords, axes, and knives from defeated enemies to use in his other hand. He can also ditch the off-hand weapon by throwing it at someone (often for a one-hit kill), and use his now free hand for grappling moves.
In the Mega Man Zero games, Zero always seems to have two Z-Sabers in the official art, but never in actual play. Same goes for the Recoil Rod in Zero 3. The recurring villain Harpuia also wields two blades. When you get the Biometal based on him in Mega Man ZX, you have them too; you get a combo attack if you swing them alternately.
In Kingdom Hearts II, three of Sora's four Drive Forms allow him to wield two Keyblades at once. Interestingly, he goes from having one in each hand, to magically controlling one while manually using the other, to magically controlling both. His Nobody, Roxas, dual-wields Keyblades as well; before we knew his name, some people called him "Dual Wielder". And in the Roxas fight in Final Mix, Sora can steal both of Roxas's Keyblades, allowing him to Tri Wield. And while it doesn't seem possible for Sora to Dual Wield at all without an explosive clothing transformation first, since Roxas can do it naturally, more or less, Sora also has the potential, according to Nomura, who thought it would have been cooler as a special treat. The reason that Sora and Roxas can dual wield is because Roxas's anger during endgame because of Xion's death allowed him to wield Ventus's Keyblade along with Sora's and this power was transfered to Sora. They are not the only ones who dual wield:
Ventus in Birth By Sleep splits his keyblade into six swords of light in his Wingblade Attack Style, although since he only has two hands he only swing two at a time (aside from his combo finisher, wherein they spin around him like some kind of deadly wheel). His final move stabs all six swords forward at once before self destructing them in an explosion of Holy energy.
In the online game Kingdom of Loathing, the Seal Clubber ability "Double Fisted Skull Smashing" allows one to do this; provided it is with one-handed weapons of the same type (melee, ranged, etc.). Damage bonuses only apply to the mainhand weapon so the damage increase isn't that significant, but having another weapon's enchantments can be quite useful. An Item Of The Month is a "Disembodied Hand" that acts as your Familiar which can wield a third weapon for you.
The barbarian is noted for his ability to dual-wield (and throw) all kinds of things, included weapons that normally require both hands to use at all.
Also the expansion pack character class of the Assassin could dual-wield claw class weapons and wrist blades, and had a specific skill to enable her to use them defensively too, comparable to a decent shield.
Heavy Metal: F.A.K.K. 2 was notable for overlapping with Guns Akimbo through Julie's ability to dual-wield almost any combination of several different guns, swords and shields at the same time.
Lucia of the unmentionableDevil May Cry title dual-wields daggers, while Dante does this in the third game with the Agni & Rudra fire and wind scimitars. Vergil takes it a step further with his Yamato katana and Force Edge broadsword, although quasi-realistically enough he doesn't try to strike with both at the same time.
Karim from Eternal Darkness can wield two talwars at the same time. Not surprising, considering he's strong enough to wield a zhanmadao.
Sengoku Basara (or the localized version Devil Kings) had several of these. Most notable are Sanada Yukimura (Scorpio) and Date Masamune (Azure Dragon). Yukimura dual-wields spears as tall as he is. Masamune typically fights with a single katana, but carries five more. His limit break lets him temporarily use "Dragon Claw" stance, where he wields all six swords, by holding them in between his knuckles. His special moves also allow him to wield three or six at a time.
In Hellgate: London, dual wielding is one of the skills of the Blademaster. Unusually for this trope, this is actually much slower and clumsier than fighting with one weapon, or even a sword and an off-hand pistol - the advantage is that you're hitting them with two weapons, which, unsurprisingly, does a lot more damage than just one, as well as being able to hit with two different damage types and stack mod effects.
The Soul Calibur games have numerous examples, including Voldo, Talim, Taki, Cervantes, Hilde, Algol and Li Long. Yoshimitsu also uses multiple swords for some moves.
City of Heroes introduced the Dual Blades powerset in Issue 11. It features a combo system where using attacks in the proper sequences will cause various effects. The player can also choose what type of sword they want in each hand the same way they design their costume.
In Fire Emblem, assassins wield dual daggers in combat (they are swords in the item menu in the Game Boy Advance games (replaced with actual knives starting with Path of Radiance), but when you see the battle animations, they are clearly daggers). They are used to great effect in the games the assassins appear in, where each time an assassin attacks, there is a chance the unit will instantly kill the target. This skill is unnamed in Fire Emblem for the Game Boy Advance (the first game to have the assassin class), but is called Silencer in The Sacred Stones and Lethality in Path of Radiance and Radiant Dawn. The Pirate class also dual-wields axes.
And in the Tellius saga (Path of Radiance and Radiant Dawn), there was Altina, one of the Three Heroes and first Queen of Begnion, who Dual WieldedtwoBFSs (Ragnell and Alondite).
Quite a few of the classes in World of Warcraft can dual-wield various weapon types. In some cases, it's the best way to go, especially for Rogues, who can apply Poison to both weapons and can't use shields or two-handed weapons. They could use offhand items instead, but those hardly provide better stats and don't deal any damage. There is a certain amount of realism here, however; the offhand weapon is penalized to do half of its normal damage and the chance to hit on both weapons is lowered severely.
Warriors, Rogues, Shamans, Hunters, and Death Knights are the dual-wield classes, and with the exception of Hunters they have talents or spec bonuses that increase their hit chance (ranging from 3% to 6%) and reduce the damage penalty of their off-weapon. Considering that the chance to miss while dual-wielding is 24% (only 5% for single weapons, ranged weapons and special attacks) against targets your level (increasing by 1% for each level above you to 27%/8% against 3-level higher enemies and raid bosses), those skills/bonuses are very helpful, as it is nearly impossible get enough to never miss at all.
In Warcraft 3, Rexxar and his brethren Beastmasters fight with twin axes, as do most of the untamed Troll creeps (though trolls usually throw them).
Not to mention Illidan Stormrage dual-wielding his so-called warglaives, which are also examples of Double Weapon, which means Illidan uses four blades at once. Yeah.
Players can get those. It's crazy to see a rogue with them, and then he whips out Thori'dal.
The Wrath of the Lich King expansion pack allows Warriors to dual-wield two-handed weapons. It really has to be seen to be believed. They can still use all of their skills, which include a whirlwind. That's right, some Warriors kill things by flailing about with weapons bigger than they are. Hilarious when it's a gnome doing it.
Is this not a warrior's job? Where I come from, the entire point of playing Warrior is to get the biggest weapon you can find, put on the thickest plate armour you can get your greedy little hands on, and go whack the holy fuck out of people, monsters, the nearest living tree, your grandma...
This particular ability comes from the Fury talent tree, which is essentially The Berserker.
Also worth mentioning is the Death Knight class as they have the option to Dual Wield as well. There were also some builds that allow you to tank with two one-handed weapons instead of a single two-hander given how Death Knights can't use shields.
As a note, Hunters bring out the "Lloyd Irving Postulate" (see quote above). As Hunters don't actually Melee... ever (instead they shoot you. Sadly no Guns Akimbo.), only the stats of their melee weapons matter- and if one battle axe has 100 Attack Power and 50 critical strike rating, 2 of that battle axe does indeed have 200 Attack Power and 100 crit.
Dual Wielding is a skill in Wizardry 8, with several different daggers, swords, axes, sticks, and maces being usable in the off-hand (though these are all smaller weapons). Notably, however, without the skill, off-hand weapons take a huge hit in accuracy, making a two-handed weapon or a shield a generally better idea. Those skilled in dual-wielding, however, gain the usual benefits (extra attacks, and possibly extra status effects).
Super Smash Bros. Brawl has characters do this with certain items, if they already use a weapon normally (such as Link or Marth). One of the more hilarious versions has King Dedede swinging two hammers around like a kid hopped up on 50 tons of sugar, all while a tinny 8-bit song is playing.
And subverting the spirit of the trope while following the letter, the player actually can use two weapons at once if they're playing as the Ice Climbers. Having a Beam Sword and a Star Rod at the same time is amazingly awesome.
The metal defenders in RuneScape are a pseudo version of this Trope. They are knifes that go in the shield slot, but aren't actually used in the fight, they just give strength bonuses instead of defense.
The Barrows weapon "Torag's Hammers" are a straight example, though.
In Super Robot Wars W, the Valhawk uses its Laser Blade to effectively maul the enemy. Then it finishes by pulling out a second sword and slashing through the stunned target before flying off.
Hawkeye from Seiken Densetsu 3 dual-wields a pair of daggers. Since they each count as a separate hit each time he swings, he tends to build up hits for his tech bar faster than most characters.
Kevin "dual-wields" his fists (!?) to the same effect.
Link usually stays clear of this trope, but in The Legend of Zelda: Twilight Princess, he can dual-wield clawshots. Not for fighting, but for puzzles. And for playing Spider-Man. Wheeeeeeeeeeeee! Too bad it can only latch onto metal grating. It would be awesome to use them anywhere like that.
The elite Gerudo, including Ganondorf, can also wield dual sabres.
And in Skyward Sword there is Stalfos and Ghirahim in his second battle. Koloktos, however, gives General Grievous a run for his money with Hex Wielding, six scimitars with six arms.
The SigmaUpdated Re-release of the Xbox Ninja Gaiden remake introduced the paired katana set known as the Dragon's Fang and Tiger's Claw. The proper sequel added twin tonfa and the wrist-and-foot-claws Falcon's Talon. Near the end, Ryu also uses the True Dragon Sword and the Blade of the Archfiend together the same way he does the Dragon's Fang and Tiger's Claw.
Lao from Bujingai dual wields swords: a large, yellow saber made for physical attacks and a longsword used for channelling magic, which can also turn into a bow.
NetHack is another game where your character can "train up" in dual-wielding skill (wearing a shield or wielding a two-handed weapon is also an option.) The best weapons to combine, if any, depends on which character-class you've chosen. In homage to the historical fact noted above, Samurais start the game with two swords.
Touhou character Youmu Konpaku wields two swords in the Musashi style.
Notably, one of the swords, the Roukanken, is a katana and the shorter one, the Hakurouken, is a wakizashi.
The protagonist Byuu and his rival in Bahamut Lagoon are both Cross Knights, whose job title seems to include wielding two swords at once.
In Killer Instinct 1, Black Orchid fought with twin laser swords, each capable of producing two "blades". When KI 2 rolled around, she'd swapped to a pair of glowing tonfa. One of her opponents in the second game, Maya, was an Amazon warrior with a pair of broad-bladed knives.
Considering the fact that getting Glenn to join the party requires Serge to be a Jerk Ass to the one person who's shown him any decency in the alternate dimension, this can be a bit of a Guide Dang It. However, the ability to wield two alternate-reality copies of the ultimate weapons at the same time results in Glenn going from Awesome to God Of Destruction. And he still uses a shield while dual-wielding!
In the MMMORPG Tales of Pirates, the Crusader class can Dual-Wield. The result of this is that 75% of all PCs are Crusaders...
Mr. Big and Rody Birts from the Art of Fighting series both represent this trope. Mr. Big uses two rattan sticks while Rody wilds dual tonfa.
In Guild Wars 2 every one-handed weapon can be dual-wielded, with some restrictions (for instance, Elementalists, Necromancers and Thieves can dual-wield daggers, but Rangers can only use them in their off-hand). This is especially important for the Thief class, who get a unique attack for every combinationofweapons.
In the original .hack games, the character class "Twin Blade" is known for equipping two daggers at the same time. In the second .hack//GU series of games, the class "Twin Blade" still exists, but other classes also dual-wield weapons. "Tribal Grapplers" can equip certain gauntlets, so they come with paired weapons by default; "Macabre Dancers" wield dual fans.
Yagyu Jubei in the Samurai Shodown/Samurai Spirits games wields a daisho, the proper Samurai's armaments consisting of a katana and a wakizashi. The shorter wakizashi is held in his left hand and is generally used for quicker attacks while the katana is held in his right and delivers the stronger attacks, including many of the special moves. However, Jubei uses the wakizashi to set up the Yagyu Shingan-to from the second game onwards.
Yoshitora from Samurai Shodown 5 easily outshadows him: he carries 7 katanas with him, each of them used with a different special move with the seventh being a nodachi which he can only use after connecting with every other special move at least once. He uses all of them in sequence in his Zetsumei Ougi. On the other hand, he rarely actually uses more than one at a time.
Rohan Online has this as a feature of the Human Knight, Dhan Assassin and Dekan Dragon Fighter classes. Human knights can use a one-handed weapon in one hand and a dagger in the other (they have to be moved into the shield slot), but the dagger loses about 80% of its power this way. Dekans can do this with their Zhens, as one of their skills allows them to split the Double Weapon into two swordlike halves for dual-wielding, losing a bit of attack power but increasing attack speed. And the Dhans have a special two-handed weapon which is basically a brace of katars, one in each hand. And the upcoming Giant race is going to have true dual-wielding (a one-handed weapon in each hand) as a feature.
A feature that can be used in Baldur's Gate II and many other games based on Dungeons & Dragons (see above.) Predominately done by the Ranger or Kensai classes.
The mad Twi'lek Dark Jedi Boc, from Jedi Knight: Dark Forces II, used a single unusually thick lightsaber—which, when he felt particularly threatened, he would split into two slender ones. (See also Star Wars, in Film, above.) He was a very difficult boss, but more because of his mobility.
Halo 2 helped popularize dual wielding in first person shooters, going so far as to replace the original's assault rifle with a dual wield-able SMG. The game featured a system to instantly pick up any one-handed weapon with either hand, allowing for some interesting weapon combinations. While dual wielding was back for Halo 3, it wasn't as useful as it was in Halo 2 because of the return of the assault rifle as the main starting weapon, and both Halo 3: ODST and Halo: Reach cut out the feature entirely.
In Halo Wars, the Arbiter dual-wields energy swords. However, the first person games, while allowing Guns Akimbo, prevent Dual Wielding energy swords mainly because it would either be redundant or drastically overpowered. Same goes for the Gravity Hammer.
Rtas Vadam or Half-Jaw dual wields energy swords.
God of War main character Kratos dual wields his Blades of Athena. Two small swords attached to his forearms with chains.
Several player characters from Phantasy Star IV, for example, can dual-wield knives. Rune, a magic-user, can dual-wield shields—and still has enough attack techniques and skills to make him a strong fighter.
During the Final Battle with Dark Emperor Griffon, in Dark Chronicle, he rips off his own wings and transforms them into swords, wielding one in each hand. Since he's the size of a bear to begin with, these scimitar-shaped swords are as big as oars.
Death's Hand in Jade Empire wields two swords. The off-hand weapon is the size of a reasonable sword and the main-hand one is even larger. It is possible for the player character to use these as well, though if memory serves it needs to be modded in.
Although there are still at least two other styles in which you dual-wield weapons. Namely, Crimson Tears, in which you dual-wield swords, and Tang's Vengeance, in which you dual-wield axes.
Sovani, a reclusive race of four-armed humanoid felines, are able to dual-wield, quad-wield, or dual-wield with two-handed weapons (a pair of great swords, or polearms, etc.).
Villainous variety: Ubermutant, the boss of Level 16 in Spear of Destiny, wields a knife in each of its four hands—or perhaps, has a knife instead of a hand for each of its four arms; the ancient graphics make this a little unclear. Yes, this is a game where the main weapons are guns. He has one of those, too.
Fear Mell/Phia Melle in Star Ocean fights with dual daggers. Which she throws simultaneously. And then directs with telekinesis. And then pulls back to her hands. In other words, she gets four attacks when everyone else gets one.
Star Wars: Empire at War: Forces of Corruption example: Urai Fen, Zann Consortium Hero Unit, who dual-wields two BFS's. That can kill a light vehicle in one hit.
In the MMO shooter Gunz The Duel, in addition to blasting off with Guns Akimbo, characters can choose to Dual Wield using Kodachis, shorter versions of the regular katana sword that most melee players use.
The Hashishin in Gothic 3 are fond of dual-wielding a pair of long, thin curved swords. The nameless hero can also learn to dual wield any two swords of any length, including a flaming sword in one hand and a frost sword in the other. How useful dual-wielding is in combat is somewhat debatable, but it looks very cool.
Unfortunately averted in Mitadake High, you can only hold one weapon at a time. (though there is a glitch involving the axe...)
Shaiya's Fighters and Warriors can dual-wield swords and axes as one of their primary styles (the others being weapon-and-shield, two-handed weapon, or spear).
Skarin from Viking: Battle for Asgard dual-wields an axe and a sword. Rather plausible when you consider he usually uses the sword to deflect an enemy attack and use his axe to beheard them before they can recover.
MapleStory mostly averts this by having everyone wield one weapon, regardless of how many hands it needs to be held. Any off-hand items are shields. However, there are a couple of Bandit shields that are appear to be second daggers. They increase attack power and look like they're also striking the enemy along with the user's main dagger.
Now played straight with the Dual Blade subset of thieves.
In Might and Magic 6 and 7, dual-wielding is available to anyone who can become Dagger Expert (anyone but a Cleric) or Sword Master (varies), either of which skills allows the named weapon to be wielded in the left hand while any one-handed weapon is used in the right. In MM 9, a Gladiator can become a Grandmaster of Spear and so dual-wield spears or even halberds.
Warriors and Rogues in Dragon Age: Origins have the option of following a Dual Wielding path. Both will eventually be able to Dual Wield longswords, axes, and maces. Additionally, this allows rogues to still deal effective damage when Back Stabbing isn't an option. Zevran already has a few Dual Wielding talents if/when he joins you.
While the "left hand" equipment slot in Albion can only be used for a shield, two aliens get a "tail" slot, which can equip either a one-handed weapon or a shield. The numbers on the equipment screen treat the power of both weapons and shields as additive, although in actual combat the animations indicate that each weapon makes a separate attack.
In Demon's Souls you can dual wield two shields. I'm not kidding.
Lunia features Asuka, a girl in a school-girl themed outfit who dual-wields two katanas and looks completely Badass when you're playing her. Unfortunately, you have to pay to play as her.
Lann, one of the main characters of Vindictus, is a dual-wielder who focuses on dodges and lightning-fast combos to deliver serious damage and clear out rooms of mooks. Though he starts out with twin swords, he can upgrade to a twin spear which can be separated for even deadlier attacks.
In No More Heroes 2: Desperate Struggle, Travis gets a beam katana two-set called the Rose Nasty. The one he holds in his left hand is shorter than the right hand one. It's also the fastest beam katana in the game, although it's also the weakest.
One of the weapon options in Rune Factory 3 is Dual Blades. Seriously awesome. Especially since you can dual wield a pair of leeks. Though its effectiveness is called into question by the fact that it completely negates all defense gained from a shield. On the other hand, it's also the fastest weapon.
Considering that every fighting character uses swords in Eien no Aselia, you'd expect more people to dual wield. But due to how Eternity Swords work, there's only one minor character that you actually see use two of them. Tokimi does have two, but she fights using a fan and sword instead.
In Rift, all warriors technically can dual-wield, but it's paragons who are the masters of the art. And as rogues can only use one-handed weapons, dual-wielding is also their basic set-up.
This distinction has been lost in recent updates. Now any warrior can use any combination of dual-wielding, wielding two-handed weapons, or using a single-handed weapon and shield to varying degrees of effectiveness. Also, contrary to the information provided on the class page, the Paragon's weakness is not fighting a healer (who can be stunned or interrupted) but fighting more than two enemies, as their area of effect power is almost nonexistent. A Warlord talent allowing them to Block without a shield puts them in a slightly better position as dual-wielders than Paragons.
Castlevania: Symphony of the Night 's Alucard can equip any weapon in either hand (save two handed weapons, obviously). Though his swing speed doesn't pick up any, it can be convenient to not have to go into the sub menu if you're using elementally aligned weapons.
Pit in Kid Icarus: Uprising does this. He has a bow that can be split into two swords, and claws equipped on both hands.
Septerra Core. Marduk does this with his Daemon Swords in the game's lore (but Corgan and Selina don't when they get them in the endgame), and Badu does this with his giant knives as well.
Annah from Planescape: Torment dual-wields punching daggers (and, judging by the combat animations, her feet, though the game rules don't cover that).
Blood Omen: Legacy of Kain: Kain can wield the axes Havoc&Malice at the same time, but he needs a free hand to use spells or other items.
The Elder Scrolls V: Skyrim is the first game in The Elder Scrolls series to feature Dual Wielding (previous games only allowed you to hold a torch or shield in your off-hand). This can either be dual-wielding two melee weapons, dual wielding magic spells (or staves/scrolls), or one of each. The programmers initially did not plan the dual-wielding of melee weapons, but when a mistake in the programming allowed this to happen, they liked the idea, so expanded on it — there are unique animations for power attacks, and special perks that affect the efficacy of the tactic. There's also "Dual Casting" — casting the same spell in both hands at the same time will, with the appropriate perk, cast a more powerful version of it.
Some heroes in Dungeons dual wield weapons, usually daggers, swords or even mallets.
Fiora from Xenoblade, these are the only weapons she can carry: she always uses twin daggers, bonus points for employing an inverse grip.
Dark Souls allows you to wield any weapons (including shields) in either hand, although dual wielding sacrifices your ability to parry for extra attacks, unless that weapon is something like the Parry Dagger.
The Artorias of The Abyss content comes with two weapons meant specifically to be used together: the dark silver tracer, which can toxify enemies if used in the right hand, and the gold tracer, which is the only weapon in the game that has two attacks when held in the left hand.
Dark Souls II greatly expands on dual wielding compared to the previous two games, allowing you to go into a special stance that incorporates swinging both weapons while dual wielding.
Infinity BladeII introduces dual wielding. While it disables blocking, you gain 2 extra Stamina to compensate and you can continuously chain combos for a greater damage potential.
Some of the classes in Star Wars: The Old Republic can specialize in this if they take the right advanced class. For example, Jedi Knights can choose Jedi Sentinel as their advanced class, which bases their entire combat style around using two lightsabres.
Mass Effect 3 introduced the omni-blade, an upgrade to your standard omni-tool that can be used to stab people. Most Sentinel variants in multiplayer wield two of these.
Madeleine in The Royal Trap dual-wields daggers and apparently knows some tricks to disarm people with them.
The most natural style of Emiya Shirou, so natural that he was able to become proficient at it by simply watching Archer use it in battle.
In the web animation Unforgotten Realms, Rob is fond of having his character "Sir Schmoopy of Awesometon" dual-wield nunchacku. As the game he's playing is a parody of Dungeons & Dragons this means, of course, he takes fairly serious penalties (his character isn't even specced to use nunchacku, much less dual-wield them). To his DM's chagrin, however, he often rolls 20s.
Highly prevalent across the Madness Combat series, but the only one who's ever seen doing it with any degree of effectiveness is Hank. Some mooks try, but they usually still get mowed down before they can fire.
Belkar uses twin daggers. This is because he's a Ranger, and gets the ability for free. He uses daggers instead of swords because of his size, although possibly also because, as a Halfling, he has a penchant for thrown weapons.
Miko Miyazaki wields the standard Japanese Katana/Wakizashi pair.
Zz'dtri, an obvious parody of Drizzt, wields two scimitars. This gives him an advantage over V because they give him an alternative to spell casting, which the other elf lacks. They also channel his magic when he's blasting V.
Fighter has four swords and wields a pair of them on a regular basis. On one occasion he even used all four at oncewhen sufficiently pissed off (He is the only person in history to have mastered the sword-chucks, let alone dual-wielding them). Black Mage and Thief have also been known to use paired daggers to deadly effect (although Thief seems to really more on his ninja skills later on), leaving Red Mage as the only main protagonist to simply resort to a single sword.
Not to be outdone, Ranger dual-wields bows. And then he attempts 'the mythical art of quad wielding and its dodecarrow storm!' which is dual-wielding the dual-wield... ultimately somehow aiming four bows and twelve arrows with two hands. He does note that "Its' not easy. Really hurts the neck."
Bernadette of Flipside fights with two swords in a style called "split rose". One sword parries and the other counter-attacks.
Both Oasis and Kusari from Sluggy Freelance dual-wield their bladed weapons (large knives for Oasis, small scythes for Kusari).
Schlock Mercenary: The four-armed Andy attempts to impress Thurl by quad-wielding pistols. Thurl promptly puts him in his place by saying that he still has a humanlike eye arrangement, so he can't possibly be getting good sight pictures on those pistols-the result would be ammo-wasting, collateral-damage-causing A-Team Firing. Later he practices this anyway, when local fauna volunteers to turn a beach-volleyball match into an impromptu skeet session.
"That's all right, I'll put you down as 'very enthusiastic' and 'seen too many John Woo movies. You're in."
Zokusho Comics: Raziel of the Wayward Cross uses a pair of short swords.
In Irregular Webcomic!, during the Space theme's first cyberspace story arc, the characters run into a Darth Maul avatar wielding his signature dual-ended lightsaber. Paris attempts to face off against him with dual-wielded lightsabers, before her teammates charge into battle with their own multibladed lightsabers.
Homestuck: John has been seen charging around wielding the Pogo Hammer in one hand and the Wrinklefucker in the other. He later stopped dual-wielding and settled on using just the Warhammer of Zillyhoo.
Done briefly in Survival of the Fittest, where after the machete-wielding Andrew Klock is wounded with a corkscrew in his fight with Cole Hudson he pulls it out of himself and attacks Cole with both weapons, eventually lodging the corkscrew in an artery.
Enriqueta-2856's fighting style takes a hint from King Bradley in the v4 of Open Blue. From v2, Janice Cervantes.
Artist John Su has created a Dual Dual Wielder Wielder A guy that dual wields his sisters who in turn dual wield swords and guns.
Suki and the other Kyoshi Warriors with twin fans.
In one episode, Aang has a sleep-deprived hallucination that Appa (a six legged flying bison) stands up on his back legs and wields no less than four swords, one in each of his other "legs". (And has a samurai fight with Momo the flying lemur, who only has one.)
Furthermore, in the episode "Zuko Alone," Zuko and his dual swords faces off against an Earthbender who wields dual hammers.
Quite a few Transformers do this when combat gets up close and personal.
Beast Machines gave Cheetor a pair of yellow scimitars that looked like nothing so much as Ginsu bananas. Optimus Primal did this with two of his bodies in Beast Wars: swords for his first body and maces as a Transmetal.
Wing Saber, in Cybertron, does it a litle differently: his swords attach to his forearms rather than being held, though his combined form with Optimus Prime follows the trope normally.
Starscream from Armada can turn one of his wings into a sword, but sadly only one. Fortunately, after the Star Saber is constructed, he gets a chance to wield it alongside his normal weapon. His fellow Armada Decepticon, Wheeljack, follows the trope with a pair of, um, sticks (which the anime reinterpreted as really unergonomic guns).
Transformers Animated has Jazz using a pair of nunchaku, and post-resurrection Megatron turns each of his helicopter blades into swords. Cyclonus is seen using a pair of swords. Though never seen in the show, Arcee wields them in the packaging art. Post-upgrade Sari is first seen wielding dual blades, but never again.
In Transformers Prime, whose designs are very movie-based, Prime retains his pop-out swords and cannons, and typically dual-wields, to a greater degree than the movie version. Wheeljack has two swords as his weapon of choice.
Possibly inspired by a Batman / Planetary crossover where Batman does the same thing. The connection? Both were written by Warren Ellis. (Ellis is also fond of nanotech, which showed up heavily in his Transmetropolitan series and was the Big Bad in Dark Heart.)
Reused in The Batman vs. Dracula. Except those were actually his normal 'rangs.
At least once in Teen Titans, Robin traded in his usual staff for a pair of smaller sticks and wielded them using the Filipino martial art of escrima.
That was a hint regarding the "Which Robin?" controversy — Dick Grayson eventually adopts escrima sticks as his weapons of choice when he nails down the Nightwing costume. So Robin in TT using them = hint as to where it was all going.
Used in Star Wars: Clone Wars with General Grievous, who in his introduction fought with two lightsabers, one in each hand, then added a third partway through the fight, wielding it with his foot, then in the series finisher, dividing his arms into a total of four to fight with four sabers, one in each hand. Asajj Ventress also fights exclusively with a pair of lightsabers. They can also attach at the hilt to form a double-bladed saber with a curvy handle.
Jedi General Ripper Pong Krell takes this Up to Eleven, using not one but two double-ended lightsabers in battle. Being Multi-Armed and Dangerous as well as a legitimate brute in combat makes him a nightmare to fight, as Captain Rex and his men found out the hard way when Pong turns out to be a traitor aiming to join Dooku as his apprentice.
In Season 5, Darth Maul dual-wields his ordinary lightsaber and the Darksaber against Darth Sidious after his brother is killed.
The Mickey Mouse short Through the looking glass saw Mickey duel a card, the King of Hearts, after being spotted dancing with the queen of hearts. The torso's at each end of the card grab a sword to might Mickey with, who parrys with a needle.
Similar to his counterparts above, Dick Grayson in Young Justice is seen fighting with escrima sticks once or twice as Robin, but begins relying on them more heavily as Nightwing.
Samurai would occasionally use the two blades of their daisho, the katana and the smaller wakizashi at the same time. Sixteenth century samurai Miyamoto Musashi developed and employed the fighting style around this tactic after watching a Portuguese soldier fighting with sword and dagger.
Kendo has a style, nito-waza, of fighting with two shinai, one long and one short. It's not particularly popular, however, due to its difficulty.
Western fencing: Dual-wielding is the entire basis for fencing in "double-time", which is defending and attacking simultaneously (rather than in "single-time", where only one action is taken in any exchange; an attack or a defense.)
For an era, fencers would often wield a main-gauche in their off-hand. In fact, the word main-gauche means "left hand." It was primarily used for parrying. Dual-wielding lost popularity among fencers in favor of a single lighter, faster sword.
The "Florentine" style of fencing calls for two swords.
German dagger style that uses a pair of cleaver-like weapons, the use of a variety of daggers (not just the main-gauche) in fencing from the decline of shields down to the smallsword. (it truly became useless with the foil, as the foil was too small and light to effectively parry with a dagger. Most modern knives are heavier than a foil would be anyway), and whole schools of combat around sword and buckler (or sword and cape) that utilize the normally defensive weapon as an offensive weapon in specific cases.
In terms of using two actual swords at once, there is an master named DiGrassi who wrote on the subject, using rapiers. His conclusions were the following: Teach only to the most experienced, who have to be practically ambidextrous. Don't use in war or against armored opponents. In general, defend with one and strike with the other. It's often argued that he only put this in as a curiosity for the rich.
The army used dual-wielding quite a lot. Their sword Hwando were shorter than Japanese Katanas, but it meant they were easy to wield with one hand. One popular technique was dual-wielding swords that varied slightly in length, first striking with the shorter sword, than finishing the attack with longer one. Even if the first strike missed, the enemy would not expect the other sword to be much longer and be caught in surprise. They even went as far as to employ dual-wielding cavalrymen.
Haedong Kumdo, the modern Korean sword art, has the "ssangsu kumbup," the "two-hand sword technique."
Filipino eskrima (also known as arnis, kali, or escrima) systems teach users how to fight with two sticks first and then work their way down to empty hands, unlike most martial arts that teach empty hands first and then work their way up to weapons. Eskrima users don't just use sticks either. Many eskrima systems teach the users how to use stick and dagger, whip and dagger, twin knives, and many other weapon combinations. In all combinations, both weapons are used to attack.
Also including the "Shaolin Pens" (a pair of needle-like weapons, usually attached to rings worn on the middle finger of both hands), fans (also used singular), dao (also used singular), axes (also used singular), maces (also used singular), and on rare occasions (mainly demos by Northern Shaolin) dual spears, staves, or chains.
The most versatile and deadly dual wielded Chinese weapons were the twin hook swords and the chicken sickles. While they're often thought of as Awesome, but Impractical, they have several advantages that many European and Chinese weapons have. The hooked ends are used to hook and trap the opponent's weapon, and effectively counter shields and slashing weapons such as dao, the tail ends are used as daggers, the crescent knuckle guards predate most European knuckle guards and are sharpened, meaning you could slash with them as well. And of course the rest of the weapons are used like a normal swords or sickles to great effect. The hooks can be used to link the two weapons and then swung, making them a mid-range soft weapon (soft meaning flexible in this case, such as a rope dart or meteor hammer). Though the last application, like most soft weapon styles, is extremely dangerous to the wielder, who is more likely to cut themselves than their opponent, and shouldn't be used without extensive training.
The Sikh martial art, Gatka, teaches the dual wielding of staffs for the purpose of fending off large crowds.
A modern branch of Japanese swordsmanship called Shinkendo apparently has techniques for dual-wielding katana, reserved for advanced students only.
Kobujutsu includes dual sai, dual jitte, and sai/jitte styles. This makes quite a bit of sense, since an important quality of these weapons is to be able to trap swords in their tines. Once you've trapped the sword, you stab or bludgeon the enemy with the other weapon.
The Dimachaeri, a type of Roman gladiator that wielded two knives or gladius. Given they, like all gladiators, were entertainers, this trope's Rule of Cool stats can be inferred to date back to at least ~200-300 AD.
Some Mamluk warriors were trained to fight with two swords.
Pal Kinizsi, a legendary captain of King Matthias Corvinus of Hungary's army was often described by chronicles as always riding into battle wielding two long swords, however the few portraits remaining of him always depicted him with broad swords, which would be a bit more believable.
The NERF N-Force Vendetta, which falls into the realm of Double Weapon when the two blades are attached.