Well considering that one of the first side quests revolved around a thau creating bobbles that would cause its owner to reanimate after death and seek out other bobble owners to kill them. In an attempt to create an army of the undead (until the whole thing goes comically wrong). I wouldn't exactly say Necromancer as a job would be that far flung of a idea in the context of eorzea.

Now i realize that there about to play musical chairs with the ability and skill pools of the classes. But if you look at the way thau operates when using a pure skill set right now, Hell its a pet away from being similar to Diablo II's Necro (Focused on debilitating and enfeebling).