Haddru the Devil. The more refined of the two brothers, perhaps by necessity. For his flesh was ripped from his skeletal body at his creation, and as such was the weaker of the two. As such, he sought Order among Chaos. How so? By signing contracts with mortals, for they were the only way to escape the prison they were in, even if only temporarily. Through these contracts, the location of the key was obtained. Now, the opportunity to break out of the prison in which constrains them is actually plausible.
Gnunga, the more chaotic one. Having always been the more physically stronger of the two, he went pure domination over cunning. Wearing heavy metal plate crafted from his new home, he pridefully strides wherever he is. Slouching over? Never. He was definition of strength. Never could he allow himself to fall before those lesser than him. Building upon this pride, his mental growth has suffered. Resulting in a heartless tyrant always seeking out more strength for himself.