Louis is a supporting character in the anime film Blood: The Last Vampire. He is an adult male with dark skin, short black hair, brown eyes, and a moustache, typically dressed in a suit and tie. He works as an agent for the United States government, serving as one of the handlers for the vampire-hunting protagonist, Saya. Alongside his partner David, Louis assists in Saya’s missions against the Chiropterans, the bat-like vampiric creatures that threaten humans. He is observant and practical: early in the film, he notes that the man Saya killed on a subway train was probably not a Chiropteran, showing his analytical eye. Later, after the attack at Yokota Air Base, Louis recovers the nurse Amino Makiho before local police arrive, demonstrating his role in cleaning up the aftermath of Saya’s operations. His motivations are not explicitly detailed, but as a government operative he is focused on the containment and elimination of the Chiropteran threat. He maintains a professional relationship with David and Saya, functioning as logistical support rather than a combatant. No special abilities beyond his investigative and coordination skills are evident, and the character shows no notable development within the film’s brief runtime.