Garkon

A large red dragon of Thistlezorn and the Water World.
He plays a vital role in the health of the world by razing the village every three days, allowing it to renew itself.
He is also at the beck and call of Graykar, though Graykar can't utilize him outside of the water world without disrupting the magic of his Large Satchel.
He is not a true red dragon in that he can vary his breath weapon if needed to any of the 5 types exhibited by any of the colored dragons (acid, poison, cold, electricity, and fire.) He prefers fire.
He also has a slight appearance of being somewhat mechanical in nature due to the large black metal plates in his wings and armor and outgrowths of large rubies at some of his joints, though it is speculation only that he might not be fully organic.