Wouldn't mind seeing a class that makes use of Ioun Stones as a weapon. I just don't think Final Fantasy has ever had a class close to that, unless it was in a very obscure title.

Clubs, Axes, Hammers, and Scythes all currently lack classes as well. Unless we want to cross off Scythe as a DoL weapon. A job for Rods/Wands/Scepters wouldn't be bad either. CNJ/WHM and THM/BLM both make use of them in early levels but moved on to staves it seems.