Polite yet manipulative, Mastema is an angel who is sent to test those whose belief in God is wavering. Being a trusted figure in the heavens above, he serves none other than himself and God alone, tasked with testing and punishing sinners. He can be kind one minute, but he always harbors an innermost intensity. However, he can be prone to silliness and shock, still governed by his own principles beyond it all, and is a very kind soul to those he believes in.