Setting aside the question of combat jobs, what colour(s) would an omnicrafter WoL be?
I'm still not sure I understand the nuances of each colour in Magic The Gathering, so I'll just list out the traits that the game assumes we have. In my own opinion of the order of importance:
Willingness to help: Part of the whole "MMORPG player character" thing, since we're obviously willing to help the NPC we're accepting the quest from. This should be a major part of the colour consideration, since the WoL goes out of their way, often quite far, to turn in the absolute best work they can, even when the person in need of help does not strictly need that "absolute best". Speaking of which...
Perfectionist: Maximizing quality. More importantly, maximizing quality
to the client's needs, rather than just maximizing quality in itself. If the client needs fast work, the WoL works fast, rather than spend time perfecting every last detail. If the client wants quantity, the WoL gives quantity over quality. This is emphasized in the Armourer 1-50 questline, and reiterated in the Wachumeqimeqi questline for Alchemy and Culinarian. This ties in to the above "willingness to help", as the WoL listens to what the client wants and tailors their work to that, making the absolute best of
what the client wants.
Respectful: Particularly respect for both the materials and traditions. The WoL will always remember that the materials they use for crafting, or collect from the wilds, are part of the world, and in many cases mean a loss of life from the tree or animal they obtain the materials from. Very obvious in the Leatherworker questlines, and quite common for Fisher too. As for the "tradition" part, the WoL prefers to create works based on the teachings and methods of the cultures of origin, as shown in the Stormblood questlines. In some cases, like Culinarian, the WoL also uses their vast travel experience to make connections between similarities in cultures.
Inquisitiveness: This is pretty much the point of the Endwalker Studium quests, as well as every Alchemy questline. Is there a new way to do something that will ease burdens? Is there a new discovery in aetherology to be made if we have finer instruments? Can we invent the equivalent of luminol? And tying in with the respect for traditions, the WoL is willing to ponder
why these traditions have been passed down for so long. What can we learn from apparently meaningless rituals that might hold some wisdom forgotten even by the traditionalists? Particularly with modern knowledge to explain the causations.
Selflessness: The WoL isn't crafting (or gathering) for their own sakes. They are willing to take a loss or hit to their reputation if it can help someone else. This is a common occurrence in various questlines (especially in Heavensward) where the WoL is in some sort of competition, however informal, and decides to forgo credit for their work, giving it to the guild to fulfil a delayed order or some such. They're willing to spend time and effort to teach new hopefuls to follow in their footsteps, eg the Stormblood Goldsmith questline.
So overall, it
looks like strong White, with Blue in close second place, some Green a moderately distant third, and very little Red or Black. I could be mistaken, though, so others should correct me.