Furfur

Furfur is a Demon under the control of Lewin Light and is kin to the King of Spirits, Azazel.

Overview
Furfur is a demon of lightning related to a high level Air demon. It appears in the form of a mythological Qilin, surrounded by lightning. Lewin implies that it has an affinity for nice weather.

It is summoned with a long chant and complex ritual normally, but most of it is removed by Lewin upon summoning it:

"厳雷よを統べし主よ... 以下省略 Lightning, the Master ruling over the Four Great Arc... And the rest is omitted."

Powers and Abilities
Lightning Manipulation: Furfur is capable of unleashing vast quantities of lightning, instantly incinerating numerous Hobgoblins at once with very little effort.

Trivia

 * Furfur is a demon from the Lesser Key of Solomon, appearing as a hart with wings. He is capable of unleashing storms and tempests.
 * Furfur appears as a Qilin, a mythical Chimera like creature from Eastern Myth.