Jill is a supporting character in the anime I'll Become a Villainess Who Goes Down in History. He is a young boy who becomes a servant to the main protagonist, Alicia Williams. Physically, Jill is characterized by his brown hair, which is cut to ear length, and his green eyes.

Jill originates from the village of Roana, a remote penal colony for criminals where he was orphaned. Before meeting Alicia, his life was marked by hardship and mistreatment. With the exception of an older man named Will, the other villagers subjected him to abuse. These experiences caused Jill to lose all trust and faith in humanity, leaving him a weak and bitter child.

His life changes dramatically upon encountering Alicia Williams. Through a combination of her encouragement and her stern reprimands, she is able to reach him in a way no one else had. In gratitude and loyalty, Jill chooses to dedicate himself to serving her. This decision marks the beginning of his personal development, as he starts to overcome his traumatic past.

As the story progresses, Jill undergoes significant growth. He evolves from his initial state into a responsible, loyal, and thoughtful individual. His motivation becomes centered on the desire to become stronger, not for his own sake, but to protect the person he cares for and what he now values in his life. His loyalty to Alicia is further demonstrated when she makes it a condition that he accompany her to the royal academy. In his role as her attendant, he proves himself to be a capable and devoted companion.