With the red dragon and fireballs, it makes me think of the aspect of -- that runner really burned up the track -- fire and athletics going hand in hand.
I guess that had me thinking of green dragons for gardening, helping in that skill, and having similar abilities of the faries, bloom for example.
I am just exploring the aspects of a color and a career or skills, which one would work with what. I can't see there being a lot of different colors, but then we have the ability to change colors and pattens so who knows what they have planned.
Just fun to imagine what they will be like and what they can do.
Green can also fit into business, green = money, so the business career. Or the military, the camaflgue the soldiers wear. Blue, which makes me think of water, could go with several things, anglers, fishing for example, or even for law enforcement.
What color would be best for alchemy, artist, author, cooking with chef, culinary librarian and the others. I think it is fun (interesting?) to think of what color would go with what skill, careers; for me at least.