I only recently heard someone mention this job from past Final Fantasy games, and after looking into it a bit, it honestly sounds kind of cool!
It *definitely* parallels Red Mage in some ways -- being a fusion of Magic and Melee -- but where the Red Mage is essentially a full-time caster with a short melee-combo every now and then -- I feel like a Mystic Knight could still etch out kind of an interesting niche.
The Red Mage, to me, feels the closest thing to a true "Elementalist" sort of job, and I dig the French "Musketeer" vibe of the job! A Mystic Knight, meanwhile, seems like it could occupy a more Melee-oriented space, but still weave in a sort of "magic".
To distinguish it from Red Mage, I feel like thematically, I would have a Mystic Knight drawing on more "cosmic" powers, or even perhaps some kind of "Lunar magic". I could see landing on a Scimitar for their weapon, although part of me also kind of likes the idea of a sword-and-shield caster (low level Thaumaturges use Shields, after all). I think there's enough room for more than JUST Paladins to use Shields.
In the past, Mystic Knights in art have typically been represented with a sort of "Arabian" clothing design, which resembles the Dancer in some ways. I actually wouldn't mind that, but perhaps also add a bit of armor to the mix. Maybe not enough to look like a full-on *Tank*, but things like armored wristbands and anklets, or maybe a breastplate or shoulder-armor, maybe with intricate runes etched into it to convey more "magical" protection?
As for ROLE... well, I honestly wouldn't mind just going Melee-DPS with them. Thematically, they'd be using magic, and maybe have *some* ranged stuff (sort of a weird inverse of the Red Mage, I suppose), but I still lean towards that idea of a "Melee-caster". Maybe summoning star-showers for AoE damage, while imbuing their swords (and shields?) with magical abilities and effects.
Or maybe mix things up, and they're more a sort of "Melee-Healer", giving off an aura to heal those nearby (primarily tanks), albeit at a fairly trivial pace?
It seems like something that could be cool, to me! But what about you guys? It sound too similar to things we already have?