Argus

Argus and Rafaela are a pair of twin angels. Yet the angels of legend are all female, making Argus something of an outcast.

While the Monastery of Light utilizes his powers to eradicate all heresy, it's never even acknowledged his existence. While Argus despises humankind, holding it in the utmost disdain, he once came into possession of a demonic blade in the midst of a battle and at that moment realized that he too was a son of man.

That he was orphaned when his parents were slain by other humans. Under the demonic blade's curse he was overcome by resentment, falling into a demonic state himself as he became the Dark Angel.