Belial is a Sarrin-character inspired by the figure in Paradise Lost. In Milton's great work, Belial is one of the original fallen angels, a cowardly and slothful figure who is enormously persuasive and smooth-talking.
On the Verse
Belial's manna-dropping tongue makes him an ideal candidate for diplomacy, and as a nation of sorts, lord knows Hell needs its diplomats. He is currently staying with Lady Zilia, being his usual lazy - but faintly lascivious - self.
Belial looks like a very attractive young man with blond curls, but to those with a careful eye - namely, the Second Sight - it is difficult to hide that he has hooves and horns.