Games with Dual-Wielding
This turned out to be hard to research for some reason.
Only Dual-Wielding:
Alphadia Genesis
Bahamut Lagoon
Bloodrayne Franchise
Bujingai aka Swordmaster aka The Forsaken City
Brave Fencer Musashi & Musashi Samurai Legend
Darksiders 2
Devil May Cry 2: Lucia’s Disc
God of War Franchise
Prince of Persia: Sands of Time Trilogy
Viking: Battle for Asgard
Dual-wielding weapon options:
Assassin’s Creed 2 (Double Hidden Blade)
Assassin’s Creed 3
Assassin’s Creed IV: Black Flag
Assasin’s Creed: Origins (Twin swords)
Baldur’s Gate 2 (please note the original version of BG1 doesn’t have dual-wielding unless you covert it to BG2′s engine)
Baldur’s Gate Enhanced Edition Franchise
Blackguards Franchise
Bloodborne
Blood Omen: Legacy of Kain:
Bravely Default Franchise
Castlevania: Symphony of the Night
Dark Souls Franchise (including Demon Souls)
Devil May Cry 3
Disgaea 4
Dragon Age: Origins
Final Fantasy II
Final Fantasy III
Final Fantasy VI (The Genji Glove allows dual-wielding)
The Elder Scrolls: Skyrim
Gothic 3
Guild Wars 2
Infinity Blade II
Kid Icarus: Uprising
Kingdom Hearts 2
The Last Remnant (Trainable skill)
Live A Live
Mega Man ZX
Might and Magic 6 & 7
Monster Hunter Franchise
Ninja Gaiden Sigma
No More Heroes 2: Desperate Struggle
Path of Exile
Planescape: Torment
Rune Factory 3
Rune Factory Oceans
Star Wars: Knights of the Old Republic 1 & 2
Star Wars: Jedi Academy
Star Wars: The Force Unleashed 2
Way of the Samurai 2, 3 & 4
Wizardry 8
Dual-wielding guns:
Advent Rising
Alpha Protocol
Blood (temporary power up)
Call of Juarez
Contral Franchise
Counter-Strike
Cross Edge
Crysis Franchise
The Darkness Franchise
Deadfall Adventures
Devil May Cry Franchise
Dino Crisis 2
Drake of the 99 Dragons
E.Y.E.: Divine Cybermancy
F.E.A.R 1
GoldenEye
Grand Theft Auto: San Andreas (Unlockable skill)
Halo 2 & 3
Heavy Metal: F.A.K.K. 2
Hitman Franchise
Hotline Miami 2: Wrong Number
House of the Dead: Overkill (Wii Edition - Requiring 2 wii motes!)
Infernal
Just Cause 2
Killing Floor Franchise
Lara Croft and the Guardian of Light
Lara Croft and the Temple of Osiris
Left 4 Dead Franchise
The Matrix: Path of Neo
Max Payne Franchise
PAYDAY 2
The Punisher
Resident Evil: Code Veronica
Rise of the Triad
Return to Castle Wolfenstein
Saints Row Franchise (Unlockable dual pistols/smgs)
Serious Sam 2
Shadow Man
Shadow Warrior
Side Mier’s Pirates! (2004)
Soldier of Fortune II: Double Helix
Star Wars: Knights of the Old Republic 1 & 2
Star Wars: The Old Republic (Bounty Hunter and Smuggler spec)
The Suffering
Sunset Riders
TimeSpliters Franchise
Tomb Raider Franchise - Up to the 2013 reboot Lara’s default starting pistols were her most iconic weapons, but not all of her guns are dual-wielded.
Total Overdose
True Crime Franchise
Wet
Wolfenstein Franchise (post 2009 reboot)
Specific characters/classes only:
.hack Franchise (Twin Blade, Tribal Grapplers & Macabre Dancers classes)
Borderlands 2 (Gunzerker)
Borderlands: The PreSequel (Nisha spec)
Diablo 2 (Barbarian & Assassin)
Diablo 3 (Barbarian, Monk, & Demon Hunter)
Disgaea Franchise (Prinnies)
Dragon Age 2 (Rogues)
Dragon Age: Inquisition (Rogues)
Dynasty Warriors (I went crosseyed looking at the character list to sort through)
The Elder Scrolls: Online
Final Fantasy IV (Yang & Edge)
Final Fantasy IV: Interlude (Yang, Edge,Tsukinowa, Ursula )
Final Fantasy IV: The After Years (Yang & Edge)
Final Fantasy V (Ninja)
Final Fantasy X-2 (Gunner and Thief)
Final Fantasy XI (Ninja, Dancer, Thief & Blue Mage)
Final Fantasy XIII (Sazh)
Final Fantasy XIV (Monk & Ninja)
Final Fantasy Tactics (Ninja)
Final Fantasy Tactics Advance (Ninja)
Final Fantasy Tactics A2: Grimoire of the Rift (Ninja)
The First Templar (Marie)
Guild Wars (Daggers)
Hellgate: London (Blademaster)
Heroes of the Storm
Killer Instinct
Kingdom Hearts 358/2 Days (Roxas)
Jade Empire (Crimson Tears & Tang's Vengeance styles allow the player to DW, the party members Black Whirlwind, Sky and Death’s Hand all DW)
League of Legends
Onechanbara Franchise (Aya & Kagura)
Overwatch
Nethack
Persona 2 (Baofu)
Persona 4 (Yosuke)
Rohan Online (Human Knight, Dhan Assassin & Dekan Dragon Fighter)
Rift
RuneScape
Samurai Warriors
Shadow Hearts: From The New World (Shania)
Skies of Arcadia (Vyse)
Soul Calibur
Star Ocean (Phia Melle)
Star Ocean: The Second Story (Ashton)
Star Wars: The Old Republic (Jedi Knight/Sith Warrior spec)
Suikoden II (The Hero)
Suikoden IV (The Hero)
Suikoden Tierkreis
Tales of Destiny 2 (Judas)
Tales of Hearts (Kunzite)
Tales of Innocence (Spada Belforma)
Tales of Pirates (MMO)(Crusaders)
Tales of Symphonia (Lloyd)
Tales of Symphonia: Dawn of the New World (Richter)
Tales of Xilia 2 (Ludger)
Tales of Zestiria (Rosa)
Tenchu Franchise (Ayame)
Vindictus (Lann & Vella)
World of Warcraft (Warriors, Rogues, Shamans, Demon Hunters & Death Knights)
Xenoblade (Fiora)
Special Mentions:
Bayonetta Franchise - Technically Bayonetta has two weapon slots: Her hands and her feet. However, as her gun-based weapons come in pairs, this means she can wield four of them at once.
Bravely Default: End Layer - Features the Centaur class asterisk which can quintuple wield!
Fire Emblem: Several games have characters with dual-wielding sprites, but it is only cosmetic.