Diane, also known as the Serpent Sin of Envy, is one of the main characters in the The Seven Deadly Sins franchise. She is a Giant and member of the Seven Deadly Sins. Her power is Creation. She is also the wife of King. Also the mother of Zach, Zilian, and Zana.

Diane is a very friendly Giantess and is also very confident regarding her abilities. She cares very much about her captain & holds very strong feelings for Meliodas, often cuddling him and becoming very delighted from compliments.