Sill Plain is a principal character in the Rance series, a popular Japanese adult role-playing game franchise. She serves as the loyal companion and slave of the protagonist, Rance, often acting as his voice of reason and emotional anchor. Sill is a talented mage known for her kindness, intelligence, and unwavering devotion. Despite enduring hardships and Rance’s often harsh treatment, she remains steadfastly supportive, playing a critical role in both the story’s progression and Rance’s personal growth throughout the series.