Since I don't know anything about FF lore:

what is the concept for Gunbreaker?
The other 3 tanks have a relatively consistent concept throughout their skillsets. Paladin is somewhat of a royal guardian angel, Warrior is the classical barbarian and Dark Knight has it's dark magic.
So far (not knowing the story behinde the class) Gunbreaker has a random skill set and I can't realy see a consistency in the skills and animations. It is like a mix between Paladin and Machinist.
What is the class fantasy of Gunbreaker?