Final answer:
The character who uses Fafnir in Norse mythology is Sigurd, a hero who slays the dragon to gain its hoarded treasure and the wisdom from its blood.
Step-by-step explanation:
The person who uses Fafnir in literature is Sigurd, a legendary hero of Norse mythology. In the Volsunga Saga, which is a late 13th-century Icelandic epic, Fafnir is a dragon that hoards treasure. Sigurd is instructed by the dwarf Regin, who is also Fafnir's brother, to kill the dragon. Sigurd succeeds in slaying Fafnir and gains the wisdom of understanding the language of birds after tasting the dragon's blood. The story of Sigurd and Fafnir is a classic example of a hero's journey, and it has been influential in shaping the fantasy genre.
The name of the person who uses Fafnir is Sigurd, a hero in Norse mythology. Fafnir is a powerful dragon that Sigurd slays in the Völsunga saga, an Old Norse epic. After killing Fafnir, Sigurd gains the dragon's treasure and acquires the ability to understand the language of birds.