Black Heracles Lemargos (暗黒ヘラクレス星座のレマルゴス, Burakku Herakuresu no Remarugosu) is the Black Heracles Saint, a member of Black Altar Avido's Nero criminal organization, an enemy of Athena's Sanctuary.
He appears in a meeting of the Black Saints, discussing the fact that the Sanctuary would soon send some Saints to stop their criminal activities, expressing disdain towards Lumaca. He was sent by Black Hound Judo to stop Pisces Albafica. However, when Judo was struck in the back by one of Albafica's roses, he wondered what happened to Lemargos. The Pisces Saint explained to him that he had easily finished Lemargos with his roses.