Diablo ｢ディアブロ, diaburo｣, also known as Noir ｢原初の黒ノワール, nowāru, lit. "Primordial Black"｣ is one of the seven Primordial Daemons and an "executive" of the Jura-Tempest Federation, serving as a secretary and Butler to Rimuru Tempest. He is the leader of the Black Numbers and is Rimuru's most powerful subordinate among the Twelve Guardian Lords and the Top Three.