Matthew McMahon

thumb|left|Matthew finds cleaning up Yor's mess a hassle Matthew is a quiet and stoic man who speaks in a blunt, straightforward manner. He maintains a calm and professional demeanor even in life-threatening situations, rarely displaying strong emotion. Like Yor, Matthew remains largely unfazed when facing enemies in combat, treating assassination as routine work. However, he has occasionally shown mild exasperation at Yor's tendency to leave particularly messy scenes, noting the extra effort required to clean up afterward. Matthew also appears to demonstrate a strong respect for knowledge and history, as seen when he corrected Millie Myers for inaccurately blaming Donovan Desmond for starting the Second East-West War. He emphasizes the importance of understanding facts before assigning blame, reflecting both his principled nature and his belief in personal responsibility. thumb|Despite his awareness of his job's reputation, Matthew remains dedicated to his work Matthew takes great pride in serving Ostania through his work as a Garden assassin and intends to continue doing so for as long as the organization requires his service, even during times of peace. Because of this outlook, he is highly disciplined and expects the same focus from others, reminding Yor to set aside personal emotions during missions and concentrate on the task at hand. Despite his unwavering dedication, Matthew is fully aware that the nature of Garden's work would be viewed as morally questionable by outsiders. thumb|left|Matthew expressing his hope to maintain his relationship with his wife Although his words and demeanor can be harsh, Matthew is more empathetic than he initially appears. He quietly demonstrates concern for Yor's well-being, allowing her small personal freedoms when appropriate, such as encouraging her to spend time with her family after the Princess Lorelei mission. His own devotion to his wife, Maureen, also reveals a more human side to Matthew, as he worries that she would leave him if she ever discovered the truth about his occupation. Nevertheless, Matthew values their life together and strives to return home safely after each mission. When Yor expresses doubts about balancing marriage with her profession, he used his own marriage as a frame of reference when advising her, emphasizing that partial commitment would ultimately cause harm. Having lived through both East-West wars, Matthew holds a pragmatic view of conflict. He believes that war will continue as long as people remain the way they are and harbors particular disdain for individuals who exploit warfare for profit. Though he accepts violence as an unavoidable part of his duty, he views it as a grim necessity rather than something to be celebrated.

Matthew is a tall, elderly man of average build and height. He has a light complexion, arched eyebrows over narrow black eyes hidden under reflective glasses, and short gray hair parted down the middle. Matthew typically wears a white shirt under a dark gray business suit with a dark teal tie. He also has a silver ring on his left ring finger. In his younger years, Matthew had dark hair which was styled similarly to his current one.