Diane is a central character in the anime series 'Nanatsu no Taizai', also known as 'The Seven Deadly Sins'. She is a member of the titular group, representing the sin of Envy, and is known for her immense strength and large stature as a member of the Giant Clan. Despite her intimidating appearance, Diane is kind-hearted and often displays a nurturing side. She harbors deep feelings for fellow group member King and struggles with her self-worth due to her size and strength. Her character arc involves personal growth and understanding her place in the world.