Dark Knight

[Tsukino]

All these folks upset that its a tank...

The original Drk in Final Fantasy was a tank.

Dark Knight's signature ability is Darkness, which consumes their HP to deal damage. Cecil was only a tank after he became a paladin.

It was a damage dealer in IV, X-2, and XI, as well as Tactics and Legend/Dimensions. And the remake of III (it originally was called something else).

It actually hasn't been in very many games at all, but it was never a tank. Of course, single player games also rarely require true tanks, and the only one that ever has fit the bill is Paladin due to Cover and low HP auto-cover.

[TheRogueX]

Dark Knight's signature ability is Darkness, which consumes their HP to deal damage. Cecil was only a tank after he became a paladin.

Sorry, but no. Cecil as Dark Knight was a tank who had a burst-DPS signature move. The differences stat-wise between Cecil as DRK and Cecil as PLD were minimal. Both ways you used him in the front row so that he'd be attacked more often and take the brunt of the damage, because he was high DEF/MDEF/HP. Minus Darkness, his DPS was poor.

Edit to add: I hope SAM is eventually introduced as a tank, too.