Lo folks, so here's my question do you think a dragon could become a demon prince?
Look at it this was before saying no:
1. dragons are intelligent creatures with free will.
2. demon hood is offered to beings with free will to make them serve the dark gods.
3. dragons are somewhat resistant to the mutating forces of chaos (the only mutant dragon we've seen was possessed so it doesn't really count, chaos dragons were born that way so they're really more of a sub spieces than mutants)thus less prone to spawndom.
4. a demon prince is just a mortal soul empowered by a chaos god so it can exist on its own in the realm of chaos.
I see no real reason that a dragons soul could not be empowered in such a way. Yes affecting a much larger creature would probably require vastly more chaos energy than doing i to a mortal. (as we've seen that even elves require a lot more chaos energy to become demon princess).
oh and an additional though what if a champion riding a dragon were granted demonhood and the dark goods merged his spirit with that of his dragon granting them both 'immortality'.