My campaign involves a long extinct dragonborn empire, and as part of their souls being sealed their king and their court were sealed into the body of an ancient dragon.

Black is for the cruel and evil nature of this empire, ruthlessly demolishing the nations that didnt cooperate

and Red is for the Prideful and ever expanding wrath of this empire endlessly growing.

I want to make a hybrid dragon as the chosen form, which will terrorize the party on multiple occassions before eventually many sessions down the road be defeated. I plan on having an actual model on the tabletop, so any appropriate suggestions would be cool, and what kind of color scheme it should be.