Red Mage as a melee damage dealer. Works out pretty well. Only issue is that it also makes a lot of sense as a tank, but I think that they could just have Mystic Knight or some other variant as a tank. It's also possible (though doubtful with Astrologian being shown) that Dark Knight is a DoM Tank.

And Dancer seems like the best choice for a melee healer of sorts, if they ever do one that is.