I absolutely hate the idea of a scythe job, but I would like to see what they'd do with Necromancer. If memory serves, they've only done necromancer as a playable job once in the entire FF series, and that was the GBA version of 5. They used rods and knives, had a native "undead" status, and basically played like a blue mage that drew their spells exclusively from undead and demons and other "dark" creatures. Seem to recall they could also summon a demon.