1st part
Luneth=Warrior
Arc=Red Mage
Refia=Black Mage
Ingus=Thief

2nd:
Luneth=Knight
Arc=RM(Scholer for Hein fight)
Refia-BM
Ingus=Theif/Ranger(Alternate)

3rd:
Luneth: Viking
Arc: RM/Evoker(swapped half way through)
Refia: BM
Ingus: Dragoon

4th:
Luneth: Viking
Arc: Sage
Refia: Magus
Ingus: Dragoon/Ninja