Luigi is a young boy who appears in the anime and manga series The Seven Deadly Sins. He lives with his sister, Ellen, in a village situated at the entrance to the Capital of the Dead, a location that serves as a resting place for souls who have passed away. Together with his sister, he guides living individuals who seek to enter the Capital of the Dead, even though those who enter are no longer among the living.

Luigi is characterized by a protective and earnest nature. He is deeply devoted to the safety of his sister and does not hesitate to confront anyone he perceives as a threat, even if it means resorting to physical means. He speaks in a polite and cautious manner, but shows determination when the situation demands it. His motivations are primarily driven by his duty to guide people to the Capital of the Dead and his unwavering commitment to shielding his sister from harm.

Within the story, Luigi serves as a minor supporting character who appears during the arc involving the Capital of the Dead. His role is to help the main characters gain entry into this mysterious realm and to provide assistance or information as needed. He does not possess any supernatural abilities or notable combat skills; his strength lies in his courage and devotion to his sister.

The key relationship in Luigi's life is with his sister, Ellen. They work together to guide visitors, and he consistently prioritizes her protection above all else. His development throughout the series is limited, as he remains a background character with a small but meaningful presence. His actions reflect a simple but strong sense of responsibility and familial love.