Double-bladed weapon

Double-Bladed Weapons, also called Thief Swords, are a type of recurring weapons in the Final Fantasy series. They are unique weapons, in that they bear two independently separate blades the tip of each ends and they have their own method of functionality. This sort of weapon, like the Gunblade, sees its use in the hands of both playable characters and NPCs of the series.

Final Fantasy V
The Twin Lance is the first double bladed weapon, appearing as a boomerang type weapon and can be equipped by Freelancers, Thieves, Ninjas and Mimes. With its double blades, this weapon can attack twice in one turn.

Final Fantasy IX
Thief Swords are a series of weapons unique to Zidane Tribal.

List of Final Fantasy IX Thief Swords:
 * Butterfly Sword
 * The Ogre
 * Exploda
 * Rune Tooth
 * Angel Bless
 * Sargatanas
 * Masamune
 * The Tower
 * Ultima Weapon

Final Fantasy XII
Judge Magisters are known to wield paired weapons, one short, and one long; separate, these weapons act like single hand weapons, conjoined, they act akin to a double ended polearm, with both blade's edges facing outwards rather than a cyclical parallel. One prime example is of Judge Gabranth, whose weaponry comprises of the Chaos Blade and the Highway Star.

Final Fantasy XIII
Oerba Yun Fang wields spears bearing two spearheads. In addition, this weapon can also be converted into a sansetsukon-nunchaku form. Zatetsuken is also a dual-bladed weapon.

List of Spears:
 * Bladed Lance
 * Glaive
 * Kain's Lance
 * Dragoon Lance
 * Dragonhorn
 * Kain's Lance
 * Partisan
 * Rhomphaia
 * Shamanic Spear
 * Heretic's Halberd
 * Punisher
 * Banescissor Spear
 * Pandoran Spear
 * Calamity Spear
 * Taming Pole
 * Venus Gospel
 * Gae Bolg
 * Gungnir

Final Fantasy XIII-2

 * See Also: #Noel's Dual Swords]]

Dual Swords are weapons wielded by Noel Kriess, comprised of a series of dual paired swords that can be combined to create an elaborate javelin.

List of Dual Swords:
 * The Tower
 * Blessed Blade
 * Flame Fossil
 * Rune Tooth
 * Howling Soul
 * Survivor's Edge
 * Sargatanas
 * Volatile Spark
 * Avenger's Edge
 * Nomad's Machete
 * Guardian's Edge
 * Sacred Cross
 * Shellbreaker
 * Orochi
 * Blazing Spirit
 * Fragarach
 * Romulus and Remus
 * Grasitha
 * Vajradanda
 * Mac an Luin
 * In Paradisum
 * Odinblade
 * Calamity Blade (DLC)
 * Calamity Blade: Sigma
 * Calamity Blade: Omega
 * Calamity Blade: Infinity
 * Muramasa (DLC)
 * Muramasa: Kiku
 * Muramasa: Sakura
 * True Muramasa

Lightning Returns: Final Fantasy XIII
Dual-blades are a weapon type available to Lightning. They lower Lightning's overall strength while providing the passive ability Precise HP Restore. While equipped with dual-blades, Lightning hits twice per attack.

List of Great Swords:
 * Double Saber
 * Black Gantry
 * Godly Gambrel
 * Tower Blade
 * Heaven's Bridge
 * Gagnrad
 * Double Deity
 * Guard Stick
 * Crocea Mors

Dissidia Final Fantasy
Zidane wields a pair of Mage Mashers which combine into the Ogre and Gabranth wields the Chaos Blade and Highway Star.

Dissidia 012 Final Fantasy
Zidane and Gabranth return wielding their signature weapons. Lightning wields Odin's Zantetsuken while executing HP moves.

A series of aesthetically similar weapons by the name of Sea Swallow are wielded by the main character Serge. Sea Swallows are double ended oars, apparently unique to the sea wide region of the El Nido Archipelago, used by its peoples in sailing and boating, and can also be adapted for usage as sharp bladed weapons, having many variations in different materials.