Luca is a former prostitute who later becomes an innkeeper, introduced during the Conviction arc of Berserk. Originally from a town wiped out by an epidemic, she wandered alone and eventually took refuge in the refugee camp of Albion. There, she used her survival instincts and tactical understanding of human misery to organize a small group of women, including Nina, Pepe, Fouquet, and Lucie, into a cooperative group of prostitutes. She insisted on sharing all earnings equally among them, believing that eliminating jealousy was the only way to survive the hysteria of the heretic hunts. She also took in a traumatized Casca, who had lost her mind and ability to speak, and gave her the name Elaine, covering her face with bandages and pretending she had syphilis to protect her from suspicion.

Luca is characterized by her fierce loyalty, pragmatic kindness, and unshakable moral compass. She is kindhearted and playful by nature but frequently forced to adopt a serious, authoritative demeanor for the safety of the women under her protection. She acts as a mother figure to her charges, disciplining them when necessary, as when she slapped and spanked Nina for threatening to betray her to a cult. She does not possess any supernatural abilities or combat skills; her strength lies in her empathy, integrity, and willingness to sacrifice herself for others. The Skull Knight himself was impressed by her selflessness. She once let go of Nina's grip during a fall to avoid dragging the other girl down with her, though she was saved by the Skull Knight.

Her motivations are rooted in survival and mutual aid. She understands the brutal realities of her world but refuses to become cruel or corrupt. She protects those weaker than herself and holds herself to a standard of honesty and fairness that contrasts sharply with the hypocrisy of the religious authorities around her. She maintains a romantic connection with the Holy Iron Chain Knight Jerome, who gave her a pearl necklace, which she divided evenly among her girls.

Luca’s role in the story is that of a grounded, non-combatant perspective. She serves as a bridge between the ordinary people caught in the chaos and the main characters. She interacts with Guts when he comes looking for Casca, attempts to reunite them, and later bribes a guard to enter the monastery where Casca is being held. She also meets the Egg of the Perfect World, who explains his purpose to her. After the fall of Albion, she and Nina survive by hiding in a barrel. In the later timeline, she runs an inn in Falconia, continuing to provide refuge for those in need.

Her development is subtle but meaningful. She begins as a resourceful prostitute managing a small group and grows into a figure of moral resilience who influences those around her by her example. While she does not undergo a dramatic transformation, her steadfastness in the face of overwhelming horror earns her a lasting place in the narrative as a symbol of humanity’s quiet endurance. Her notable abilities are not physical or magical; they are her sharp understanding of people, her organizational acumen, and her ability to remain compassionate without becoming naive.