Satan

Satan (also known as Lucifer, the Fallen Angel) is the "leader" of Hell along with the Queen of Terror. While classically described as male, in the manga, Satan is female, who has both the power of light and darkness in her. Michael the Archangel describes her as a nymphomaniac and sexual expert who, as an the boss of the angels, used her position to sexually harass her "employees." Satan arrives as part of the final "battle", raping Kohta while he desperately tries to avoid releasing the Queen. She later becomes trapped inside his right ball like Emanniel after a clever plan by Kohta. However she was later able to escape after he came, but she had to fight Emanniel to get out as there wasn't enough strength in the release. She nearly got him to cum again but was stopped by the Old Man. Michael fights Satan, and eventually convinces her to end the probable war, while at the same time falling in love with him.