Even though most people consider the acts of Organization XIII evil, there is still one thing to like about their concepts...weapons. Each member of the organization, save for Roxas and Xion, all have unique weapons that catered to each member. Some of these weapons were even taken into the hands of the heroes, similar to the Devil Arm system from Devil May Cry.
No. 1: Xemnas, Superior of the Inbetween. Weapons used: Ethereal Blades.
Main element: Nothingness.
Phrase used to call them: “Vanish to nothing, Interdiction”
No. 2: Xigbar, the Freeshooter. Weapons used: Arrowguns
Main element: Space
Phrase used to call them: “Distort, Sharpshooter”
No. 3: Xaldin, the Whirlwind Lancer. Weapons used: Lances
Main element: Wind
Phrase used when calling them: “Rise, Lindworm”
No. 4: Vexen, the Chilly Academic. Weapons used: Shield
Main Element: Ice
Phrase used to call them: “Crack, Frozen Pride”
No. 5: Lexeaus, the Silent Hero. Weapons used: Axe Sword
Main Element: Earth
Phrase used to call it: “Rumble, Skysplitter”
No. 6: Zexion, the Cloaked Schemer. Weapon Used: Lexicon
Main Element: Illusions
Phrase used to call it: “Materialize, Book of Retribution”
No. 7: Saix, the Luna Diviner. Weapon Used: Claymore
Main Element: Moon
Phrase used to call weapon: “Surge, Lunatic”
No. 8: Axel, the Flurry of Dancing Flames. Weapons Used: Chakrams
Main Element: Fire
Phrase used to call weapons: “Burn, Eternal Flames”
No. 9: Demyx, the Melodious Nocturne. Weapon used: Sitar
Main Element: Water
Phrase used to call it: “Make a Splash, Arpeggio!”
No. 10: Luxord, the Gambler of Fate. Weapons used: Cards
Main Element: Time
Phrase used to call it: “Start the Clock, Fair Game!”
No. 11: Marluxia, the Graceful Assassin. Weapon used: Scythe
Main Element: Flowers
Phrase used to call it: “Bloom, Graceful Dahlia”
No. 12: Larxene, the Savage Nymph. Weapons used: Knives
Main Element: Lighting.
Phrase used to call them: “Strike Down, Foudre”
No. 13: Roxas, the Key of Destin. Weapons used: Keyblades
Main Element: Light
Phrase used to call them: “Shine, Oathkeeper, Overshadow, Oblivion!”
No. 14: Xion. Weapon Used: Keyblade
Element: none.
Phrase used to call: none.