Appearance: Wild red hair, light blue eyes
Relations: Muerta(son), Lucifer(Father)
Purpose: To bring about the everyday falls of man. She also rules Hell as a sort of queen.

Sin is the literal brain-child of Lucifer, but keeps him at arms-length after having been forced to have his son. She enjoys teasing the upper demons with a "look but don't touch" policy. Still, she refers to them (her father included) as "her boys". She shows all the exasperations and care that any woman would with men.

Because of their equal standings in Hell, Beelzebub is her only confidant.