I personally believe that most classes and jobs have their place in most cultures in the game, as headcanon-y as that might sound? Let me clarify a little bit.
For example, R'khan was a member of the Sultansworn. He served dutifully and proudly, without falling to temptation or bribery like some of his peers. When word reached him for how foul his comrades were, he and his companion left the order to join the Immortal Flames.
Recently, with the Immortal Flames venturing to Ishgard, both companions happened upon the crude and deplorable sight - of what appeared to be - two dark clad knights slaughtering valiant knights of Ishgard. While the truth was quite the opposite of that. In this example, the Temple Knights can very clearly be made the parallel to that of the Sultansworn of Ul'dah.
In the wake of this meeting, R'khan and his companion picked up on the trades that the two darkly clad knights were wielding, helped along by a soul crystal of their fallen comrade and took those skills back to Ul'dah with them. There, they have indeed used their abilities against the corrupt Brass Blades and self-serving Sultansworn that forced them from their roles years before, but they also began to wander the countryside in service to the common people.
In such a way, they adapted that of the Dark Knights of Ishgard to becoming something akin to Dark Knights of Ul'dah.
Most jobs and classes can be adapted to your character's cultures and what have you. There's very little to suggest that where your character might come from - should they be from Othard or something of the like - couldn't have their own twist on certain techniques and what have you. But I would suggest to use this very conservatively. Don't go too too far with it, but it's a handy tool for character building.
For example, R'khan was a member of the Sultansworn. He served dutifully and proudly, without falling to temptation or bribery like some of his peers. When word reached him for how foul his comrades were, he and his companion left the order to join the Immortal Flames.
Recently, with the Immortal Flames venturing to Ishgard, both companions happened upon the crude and deplorable sight - of what appeared to be - two dark clad knights slaughtering valiant knights of Ishgard. While the truth was quite the opposite of that. In this example, the Temple Knights can very clearly be made the parallel to that of the Sultansworn of Ul'dah.
In the wake of this meeting, R'khan and his companion picked up on the trades that the two darkly clad knights were wielding, helped along by a soul crystal of their fallen comrade and took those skills back to Ul'dah with them. There, they have indeed used their abilities against the corrupt Brass Blades and self-serving Sultansworn that forced them from their roles years before, but they also began to wander the countryside in service to the common people.
In such a way, they adapted that of the Dark Knights of Ishgard to becoming something akin to Dark Knights of Ul'dah.
Most jobs and classes can be adapted to your character's cultures and what have you. There's very little to suggest that where your character might come from - should they be from Othard or something of the like - couldn't have their own twist on certain techniques and what have you. But I would suggest to use this very conservatively. Don't go too too far with it, but it's a handy tool for character building.