Guy Christophe Rech

Guy Christophe Rech/Lesch is a Shirogane and the puppeteer of Olympia who saved Narumi Kato's life using the last amount of Aqua Vitae after he is fatally wounded and loses his left arm. A legendary Shirogane nicknamed "Destroyer of 200 Bodies" and "Olympia's Lover." In addition to turning Narumi into a Shirogane, he is also the "teacher" who raised the young Éléonore, and in the manga, he also trained and supervised Masaru's development as a puppeteer.

Guy is a handsome and calm young man, which has a habit of often quoting Shakespeare. His physical age is 34 years old. He is stubborn and cold-hearted, but on the other hand, he is an extremely paternal man, and has weaknesses such as regressing into infantile behavior when a pendant containing a photo of Maman (his mother) is taken away from him.

He works at the hospital run by Dr. Leif Banhart which is a research facility and orphanage for children suffering from Zonapha syndrome. In the anime, Guy took Narumi straight to Dr. Banhart's Hospital, while in the manga they were hiding in France, the Shiroganes' homeland.