Februs I agree with all of your PLD changes. That sounds like it has much more identity by itself. I also like the ideas behind DRK, but dunno how it would work with the game's general meta. It would be awesome, though.

On that note, I've always thought Paladin should have a more military approach to its identity. It's supposed to be the only class that actually obeys a certain code of conduct and order, so I don't see why their skills can't reflect that. Specially with moves called, for example, Royal Authority. I think something with that name should at least give a boon to party auto-attacks or something. Something like a military battle cry from the front-lines.

In general, I think PLD should be the one that is all about party support, both offensive and defensive, while Warrior should be more about his own damage, which would make it perhaps a little bit more straight-forward, but still the strongest of the three tanks when it comes to offense.

Dark Knight could, in contrast be all about crippling the enemy and inflicting ailments and vulnerabilities.