Fighter, Thief, Black Belt, Black Mage, White Mage, Red Mage. :p
But in all seriousness, I kinda-sorta do this now. In D&D games, the six classes I use are:
Fighter (Str)
Mage (Int)
Cleric (Cha)
Thief (Dex)
Ascetic (a psionic monk that uses Wis and Con)
Ranger (actually the forester/elf class...