Quote Originally Posted by Walfan View Post
Kimahri is a blue mage and is a close-range warrior using a spear. Their core identity is using monster abilities, not cast times.
Kimahri may be a poor example due to the fact most characters in Final Fantasy X are a combination of two other FF jobs, Kimahri being Dragoon and Blue Mage (Auron is Samurai+Knight etc.).

However, you are still correct in that the only unifying identity Blue Mage has throughout it's iterations is that it uses monster abilities. In fact, Blue Mage has one of the widest variety in terms of design/look across multiple Final Fantasy titles. This means it's iteration in FFXIV if it's ever added can easily be tweaked to fit whichever role or archetype they deem necessary as long as it stills uses monster abilities in some form.