I remember when I initially started playing the game, I changed the Archer Human into a White Mage and set him down that route. Not too long after I found a white mage in my travels and they were so much better than the guy I leveled up from like lvl3 - lvl7. I basically chose classes that were similar enough to the Characters starting class, as they tend to have an stat advantage in those roles.

I also opted against suggesting

Luso - White Mage
Ransem - White Mage
Koteni - White Mage
Rafgold - Bishop
Hurst - White Mage
Ian - Time Mage

I'm nice like that.