For FFX, I would categorize the characters as:

Yuna: Summoner/White Mage
Tidus: Warrior/Time Mage
Auron: Knight/Breaker/Samurai
Rikku: Thief/Alchemist
Lulu: Black Mage
Wakka: Ranger (Archer)
Kimahri: Dragoon (Lancer)/Blue Mage