Imperial class?

[Enkidoh]

They already did.

(image snipped)

There's also Lightning's gunblade (her default weapon in FFXIII) the Blazefire Saber for GLA/PLD, although the gun portion is non-functional (making it the opposite of that MCH weapon which is a functional gun with a useless blade that is unused by the class wielding it), it still looks cool nonetheless:




As for an 'Imperial class', that's basically like saying you want a 'Gridanian' as a class - the Empire is a country, and in actual fact, most of it's soldiers (that is, regular grunts that make up the bulk of it's army), actually have standard player classes like GLA and THM (this is because most Garlean soldiers are actually drafted from subject nations like Ala Mhigo and Doma). It's clear what you are after is a class that simply uses a gunblade and... well... it's not actually a weapon that is as common even in the Imperial army as you might think.

Gunblades seem to actually be a quite rare weapon and are only issued to Legatee like Gaius and his Tribunes, and elite officer troops like Centurions. The regular soldiers of the Empire never use these weapons, thus making the idea of an 'Imperial class' a non-event. And besides, even when they are used, it seems a simple Protect spell can easily deflect their bullets, let alone their blades, making them far less awesome then they seem.

Really, as has been said certain gunblade type weapons already do exist for players anyway in the game, so this alone, let alone the other points mentioned, means an actual gunblade-using class is highly unlikely. May Yoshi prove me wrong though!