Fafnir

Fafnir is one of the Five Great Dragon Kings. He is the Golden Dragon known as the Gigantis Dragon.

Appearance
A golden Western Dragon.

Personality
Little is known of Fafnir's personality due to him being sealed in Azazel's artificial Sacred Gear, as well as the fact that there are very few instances of him being descibed.

History
Not much is known about Fafnir except he was previously killed by the original Siegfired who wielded the Demon Sword Gram but was revived by the Norse Gods.

Plot
In Volume 4, Azazel reveals that Fafnir is sealed inside his artificial Sacred Gear, the Down Fall Dragon Spear.

Powers & Abilities
As one of the Five Great Dragon Kings, it can be assumed that he is very powerful. Likely as powerful as an Ultimate-Class Devil.