Belvarro is 10% evil, 90% hot gas. The guy just wants to cause chaos and mischief and rizz up dragons. He's normally pretty chill about 99% of the time. Just don't piss him off. He may be hard to anger, but you wouldn't like it when he gets angry.

A demon of the Chaos Caste, brute variant. Belvarro is a warrior type of his kin who reside within the volcanic islands of Dolvago. While these particular demons aren't from any particular fire and brimstone dimension, his kin have developed magically warped physical attributes because of their magic rich bloodlines.

That and being connected to a place where chaotic magic is commonplace.