I would love to see a caster tank. Are there any examples of this in other games that we could draw inspiration from?

the way I'd imagine it to work would be either through shields, defense buffs, or evasion buffs or a large combination of the three. Add in (element)Spikes for damage dealt back and I think it would be a fun tank class. Or something that will change damage dealt from HP to MP. I dunno.

I just want to see something new and different in this FF than other FF titles. I would like to see something along the lines of an Aetherite Mage/Knight that uses crystalline weapons and armor. Draws directly on the Aetherite as a source of strength.

Also something I would like to see is Advanced Jobs eg; Thaumaturge/Black Mage/Black Wizard but this will be for an expansion if it were to come about.

Another interesting concept I've heard was Jobs for crafting/gathering classes wherein they specialize in a particular aspect of their field, eg; Blacksmith/Bladesmith or Botanist/Lumberjack or Herbalist (hopefully the examples i gave are pretty much self explanatory.) These are but a few examples meant to spark imagination rather than rehashing the same requests for things we will most likely see anyway.