I personally enjoy to have all my characters being all round. i started galuf off as a monk, faris as a theif, lenna as a BM and butz as a Warrior. i found this to be a good mix for the first part of the game, but then i noticed that i was lacking magic. im now just at the second part of the game(im sure everyone noes wat i mean so i dont have to spoil it for those that dont) with butz as a mystic knight with time magic, galuf as a dancer with black magic, lenna as a hunter with white magic and faris as a ninja(i use the preemptive ability to give myself an edge in random battles)