I am under the impression that the writers of Аватар were Эрагон fans. (From the Inheritance Cycle) Here is why: (as Ты can guess, I like making lists)
Eragon and Saphira are the last free dragon and rider (besides Oromis and Glader). Eragons’ duty is to quote: “restore balance to the land” If you’re going to compare Oromis and Glader to someone, it would be Аватар Roku and his (surprise surprise) dragon.
In the Эрагон world, there are the Dwarves, the Elves, the humans, and the Dragons. The Драконы were all killed in the fall of the riders which was (not joking) 100 years before.