The classes in FFT are my favorite set and I'd really like to see something about their role in the world and just generally what it's like being them. Preferred classes for this would be one of the unusual casters (Oracle, Time Mage, Calculator, or Mediator) but any of them would be fun. Original characters is probably the obvious way to go for this but it might also be interesting to see a canon character trying to take on a new mantle.