I would say we use Awakenings classes as the base for all but the non-human units. If people want more specific titles/ranks/classes, they can have them be either a special 3rd tier form or be an alternative promotion class. EX: Dark Mage is usually just Sorcerer and Dark Knight. Its Equivalent in the GBA games is the Shaman, so allow the Sage, Summoner, and Druid as options as well, since they could all be viable forms. Another: Archers > Bow Knight/ Sniper, but maybe also include Bride (Can be used as a distraction or scare tactic instead of just being idiotic as an idea) Ranger (a more Sword/Nature focused mounted unit) and Marksman (Slower fire, more power with a crossbow).

If I was bored enough I could just make a whole spread sheet. It all depends on if we want our characters to start off strong and then have stronger options or start off normal and become strong.