TV-Series
Description
Nathan Mahler is a chiropteran who serves as one of Diva's chevaliers, and his precise origins as a chevalier remain ambiguous within the series. He is a member of the organization known as Cinq Flèches, which uses Diva's blood to create additional chiropterans. For his human identity, Nathan works as a producer for the Metropolitan Opera House in New York, a position he uses to help further Diva's ambitions and to make her known to the world. His background is mysterious, and some viewers have speculated about his age or possible familial connection to the twin queens, but his actual history is never explicitly confirmed.

In terms of personality, Nathan displays a flamboyant and sometimes frivolous demeanor, which contrasts with the more violent and ruthless temperaments of many of his fellow chevaliers. Despite this lighthearted exterior, he can be calculated and dangerous when his plans are interfered with or when the situation demands it. He is one of the two chevaliers serving Diva who does not wish for Saya's death and generally maintains a neutral stance in the conflict between the sisters. Nathan's primary motivation appears to be Diva's happiness, and he supports her dreams and desires as much as he is able.

Within the story, Nathan serves as one of Diva's five chevaliers and is a supporting antagonist who works behind the scenes. His role involves managing the human side of Cinq Flèches' operations, including using his position at the opera house to promote Diva's public appearances. He debuts in episode 20 and remains a presence throughout the series, though his personal goals often remain enigmatic.

In terms of key relationships, Nathan is loyal to Diva and works alongside the other chevaliers, including Amshel Goldsmith, Solomon Goldsmith, Karl Fei-Ong, and James Ironside. His relationship with Saya is defined by his neutrality; he does not actively seek her destruction, unlike some of his companions. He contrasts with the more aggressive personalities of his fellow chevaliers.

Throughout the series, Nathan shows little dramatic personal development, as his character remains consistent in his loyalty to Diva and his flamboyant yet calculating nature. In the final episode, after being seemingly killed by Saya, he is glimpsed in the form of a reporter, leaving his ultimate fate ambiguous and suggesting the possibility that he survived.

Nathan possesses the standard abilities of a chiropteran chevalier, including enhanced strength, speed, and the need to consume blood to survive. In his human form he stands around 180 centimeters tall, while his true chiropteran form is larger. He is capable of shifting between these forms, and like other chevaliers, he has a strong bond with his queen, Diva, though the exact nature of his creation remains unknown.