Ah, so they still keep the defaults then? Good good. Really, if you wanted to match their job to their 'personality' so to speak, you could go with:

Vaan - Red Mage or Monk, he seems like a jack of all trades kind of guy, and can use his fists
Penelo - White Mage or Monk, very mage orientated in the first place, and was trained in the martial arts by her brothers
Basch - Knight or Breaker, just a very hard hitter all round
Ashe - Time Mage or Black Mage or Red Mage, another magey type, and she was a Time Mage in Revenant Wings
Fran - Machinist or Hunter or Archer, she maintains the Strahl and is like a huntress.
Balhtier - Machinist or Uhlan, largely because of guns and I can see him using a spear