I hate all of them. On principle.
Oh thank God. I was dreading having to feign politeness about how much I hate the new era of "outright corpo shill playable ad" MTG. Gott Straffe WoTC.
As a collective entity, they represent all colors but Black
If we get around to doing Villains, are there any who aren't just going to be some shade of black?
It is a fearful thing to fall into the hand of the living god, etc.
"Ne raillons pas les fous; leur folie dure plus longtemps que la nôtre ... Voilà toute la differénce."
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Anyways, my picks. Mostly a random grab back of antagonists that I can squeeze in cheap and quick:
(FF1):
-GARLAND:
BLK/WHI
Once heroic Fallen Knight. Beatstick. Self explanatory. Has some kind of "once in graveyard summon Chaos" gimmick.
-CHAOS:
BLK/GRN/RED/BLU
Lord of the Elemental Fiends. Absolutely some multicolor abomination save for White, with a land-based gimmick to represent his domination over the elements. Maybe a self-rez condition for timeloop shenannigans?
(FF2):
-THE EMPEROR OF PALAMECIA:
BLK/BLU/
Sorcerer king, master of men, monsters, machines, and magic. Evil intent with a penchant for underhanded tricks. a strong case can be made for Red, but I saved that for the next entry.
-THE EMPEROR OF HELL:
BLK/RED
The Lord of Hell. Infernal mastery and a now total reliance on overwhelming force squeezes out Blue for a stronger focus on Red and Black.
-THE EMPEROR OF HEAVEN:
BLK/WHI
The Lord of Heaven. I know you didn't play Dawn of Souls, but I'm including anyway because I like it. "Just trust me bro, I've reformed." False idols and heavenly tyranny = Schwartz un Weiss.
(FF3):
-XANDE
BLK/RED
Barely even a character, but nihilistic rage seems like a Black/Red thing, probably?
-CLOUD OF DARKNESS
BLK
It's a literal cloud of Darkness, c'mon. No clue how to flavor "spam Particle Beam" as an interesting mechanic.
(FF5):
-EXDEATH:
BLK/BLU/GRN
Evil=Black
Magic=Blue
Tree=Green
Evil Magic Tree = Black Blue Green.
-GILGAMESH:
RED
God's perfect idiot. Pure Red. Has a multi equipment equip gimmick or something probably.
FF7:
-RED XII:
RED/WHI
Even if he wasn't a brave and noble warrior protecting his community who has a fierce fighting style with lots of self-buffs...his name is RED.
-CAIT SITH / REEVE TUESTI:
COLORLESS ARTIFACT / BLU/WHI...MAYBE???
Purely colorwise I'd peg CS as a colorless artifact creature. Reeve being the only Shinra employee with morals and a brain is some combo of blue and white.
I don't know nearly enough about current MtG to know how you'd model this in gameplay though. Endless Cait Sith tokens? That story mechanic to represent having 2/3rds of your character development occur offscreen?
-YUFFIE:
BLU/BLK
Impetuous anti-authority ninja thief is Blue and Black for sure.
-CID:
RED
Mono Red, because he's a tempermental self-serving jackass who manages to be a hero almost entirely incidentally. Also, explosions and machines.
-VINCENT:
BLK / ?
Honestly, Vincent is such a thematically busy character I think you could make strong cases for and against either Red or Green for a secondary color. Monster transformation seems very Green, while vengeance blood oaths and guns is very Red. He can be one of those flippy transformaton cards from Innistrad that I liked so much.
There's like...fifty possible XIV cards, so that'll have to be a seperate post.