Lucius Oriflamme, known as Luca, is the young heir apparent and Grand Duke of the powerful Oriflamme vampire lineage. Despite his barely adolescent appearance, he commands significant political influence, though his uncle August Ruthven handles most duties. Luca possesses a childlike look with short reddish-brown hair featuring distinctive cowlicks, thin eyebrows, large upturned green eyes, and long eyelashes. He often wears elaborate attire, such as a green mantle detailed with silver over black shorts and a white shirt. His personality blends maturity and childishness. Luca displays responsibility and calmness beyond his years, often underestimated by adult vampires. He fiercely protects his chevalier Jeanne, reacting aggressively to perceived threats against her, including unleashing explosive outbursts of pyrokinesis—flames generated from his body—though he struggles to control this ability. When nervous, he clutches his clothing or hands, revealing underlying vulnerability. Naivety surfaces in social interactions, particularly regarding romantic matters, causing panic when Jeanne develops feelings for Vanitas. Tragedy marks his backstory; both parents died, leading Ruthven to adopt him and his older brother Loki. Luca deeply cherishes Loki, initially demanding Vanitas's book solely to cure Loki's curse-bearer status. His loyalty drives extreme actions, like ordering Jeanne to attack Vanitas and Noé during their first meeting in Paris to seize the book. When Vanitas kissed Jeanne without consent, Luca's rage enabled him to break free from Noé's restraint and unleash uncontrolled fire. Luca develops through relationships. He bonds with Noé during the Bal Masqué, apologizing for prior hostility and later inviting him to a café outing as thanks for saving his life. He openly defies the vampire senate to protect Jeanne from execution, asserting her role as his personal Borreau. His protectiveness evolves into comedic distress as he navigates Jeanne's romantic confusion, dragging her to Dominique for advice after she admits affection for Vanitas. Non-canonical material notes his birthday as July 31. He expresses a desire to grow taller, delightedly reporting height changes during measurements. Envy of adult interactions surfaces humorously in a Drama CD spin-off where he wishes to stay up all night talking like Roland and Olivier. Relationships define key motivations: - Ruthven acts as a trusted parental figure, though Luca becomes distressed when Ruthven attacks Vanitas. - Loki inspires unwavering devotion, with Luca frequently visiting him. - Jeanne receives fierce dedication; Luca prioritizes her safety and emotional well-being, reacting strongly to her interactions with Vanitas.