Luvelia Sanctos is the daughter of the Brave Swordsmen's Guildmaster and the primary fiancée of Peter Grill, the world's strongest man. Her father initially approved their engagement after Peter's tournament victory but later attempted to end it, prompting Luvelia to threaten severing ties with her father to stay with Peter.

She possesses long black hair and blue eyes. Her attire consistently features a white dress, a purple mantle, armored gloves, and a headband adorned with cross insignias. She completes her look with a purple cape, white boots, and purple high socks marked by a single white stripe.

Luvelia embodies a kind and gentle nature, eager to help others as a priestess devoted to worshiping the god Rimul. However, her upbringing under an overprotective father fostered extreme naivety, particularly about reproduction. She initially believed babies were delivered by storks and dismissed explanations of human biology, a misconception only dispelled after witnessing a birth firsthand. Analysis identifies her personality as ENFP and Enneagram Type 2w3, reflecting her idealism, empathy, and drive to support others, though she struggles with boundaries.

Throughout the series, Luvelia confronts significant challenges. She was captured by a Great Worm Goblin during a mission and nearly violated before Peter rescued her. She once invited Peter to join her at a legendary hot spring believed to bless couples with children, but circumstances prevented his acceptance. Despite Peter's involuntary infidelities and her complete unawareness of the harem of non-human women pursuing his "seed," Luvelia maintains steadfast trust in him.

Her key relationships center on Peter, whom she supports emotionally, and her father, whom she defied to protect their engagement. She also befriended Peter's sister, Lucy Grill, who assisted her in training. As a holy knight, Luvelia wields divine powers in combat, though she frequently requires rescue, highlighting a gap between her role and her effectiveness in battle.