Mark serves as leherl (senior clerk/assistant) at Benno's store, acting as Benno's right-hand man. He has short brown hair and typically wears a waistcoat over a white shirt. Mark possesses a dignified, professional, and thoughtful manner, coupled with high competence and a generally kindhearted nature; however, he harbors a vindictive streak that emerges when someone disrespects Benno.

His background stems from an apprenticeship within the Gilberta Company, knowing Benno since childhood. Following Benno's father's death, Mark chose to stay and support Benno's leadership. When Mark's own family later attempted to crush and absorb the weakened Gilberta Company after Benno's parents' deaths, Mark retaliated by ruining his family's store.

Within the story, Mark appears instructing Myne on writing order forms while Lutz practices letters. He later accompanies Myne on a visit to lumber workers, assisting her when she collapses and ensuring her return to the Gilberta Company to recover. Mark develops professional relationships, expressing admiration when Lutz demonstrates the ability to write his name during their first meeting. He also shows keen interest in Myne's capacity for mental calculation without a physical calculator, requesting lessons due to their practical utility. Mark commits to mentoring Lutz, preparing him for the challenges of working alongside Myne and Benno.

A defining aspect of Mark's motivation is his aspiration to become Benno's "God of Fire" – a divine figure within the story's pantheon who supports growth from the sidelines. This reflects Mark's overarching goal of fostering Benno's success through unwavering, behind-the-scenes dedication.