Hero is a scion class skilled at engaging multiple enemies at once. Heroes can wield three types of weapons: Swords, Twin Machine Guns, and Talises.
Phantom is a scion class with a wide array of different attacks and superior dodging ability. They can equip three different weapons types: Rod, Katana, and Rifle.
Etoile is a scion class specializing in defense and support skills. They are capable of equipping Double Sabers, Soaring Blades, and Wands.
Luster is an inherently agressive class with it's own unique mechanics. It uses only Gunblades, but 3 different styles/types. (Original artwork)