Final Fantasy Wiki says it's a Mystic Knight/Spellblade from Final Fantasy Tactics A2: Grimoire of the Rift.
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I might be reading too into it, but I am almost certain they were joking about the fact that Spellblade in FFT:A2 is literally just Red Mage but melee.
And as someone who still to this day plays the game regularly(currently doing an all Blue Mage Run with a Luso named..Bluso), it seriously is just Melee Red Mage with a Blue coat