As the Demon God of Greed, he speaks with an imposing and indifferent tone, referring to Goetia as "my child," "Goetia," or "my little bird." The Flame of Sin has two massive horns growing from the sides of his head and wears a mask shaped like a crow. His long tailbone is also one of his symbols as a Demon God. The tailbone has no flesh or scales, leaving the bone structure completely exposed, making it sharp and hard. The Flame of Sin's body is composed of stones and rocks. Only his face, chest, and parts of his lower body are human in form; his abdomen, arms, hands, and legs are made of solid stone. While he has the shape of hands, he possesses no soft flesh or fingernails. He treats Goetia like a toy and often summons him to his chambers to relieve his boredom. Even if Goetia dies or is injured, he is a creation of an immortal being; as long as the Demon God lives, he can be repaired and resurrected at will. His feelings are closer to possessiveness than love.

Flame is a messenger born from the feathers of the Flame of Sin. She is a woman with short golden hair. She considers Goetia her brother and, while unconsciously jealous of the attention he receives from the Demon God, she possesses a kind heart that worries for him. She calls him "Goety" or "Goetia."