Fafnir's species is a species of dragons which name has yet to be revealed, of which Fafnir happened to be member of.
The appearance of these dragons greatly resemble anthropomorphic depiction of Dragons from Eastern mythology. They possess elongated necks, white scales, two stag horns, and gray hair on their head. They also appear to be approximately at least eight times taller than average humans.
As with other dragons, Fafnir's species possess a great longevity, as evidenced by Fafnir's contract with Luna Nova Magical Academy in "Luna Nova and the White Dragon". They also seem to possess considerable intelligence which is comparable, if not equal to humans' as well as ability to speak human language. This is best demonstrated by Fafnir himself, who has adapted with human customs and technology.