Mou Ki is the second son of Mou Bu, grandson of Mou Gou, and younger brother of Mou Ten. He serves as a strategist in the Mou Bu Army and is one of the most skilled tacticians in the state of Qin. A graduate of Qin's Strategist Academy, he was regarded as Shou Hei Kun's top student of his generation, alongside Ka Ryo Ten and his older brother. He is known for his calm demeanor, which allows him to maintain composure in crisis, and his analytical abilities enable him to assess enemy strengths and weaknesses to devise effective strategies. He is deeply loyal to his allies and committed to the success of his army and the state of Qin, guided by a strong sense of responsibility and duty. His motivations are rooted in supporting his family, particularly his father Mou Bu and his brother Mou Ten, and contributing to Qin's unification campaigns. In the story, he often provides tactical counsel, helps shape battlefield plans, and commands units within the Mou Bu Army. He shares a close bond with his brother Mou Ten, a strong relationship with his father Mou Bu, and a student-teacher connection with Shou Hei Kun. Alongside Ka Ryo Ten, he is one of the promising young strategists of his generation. His development sees him grow from a promising academy graduate into a seasoned commander entrusted with larger responsibilities in major campaigns. His notable abilities include high intelligence, strategic planning, meticulous battlefield analysis, and leadership of troops, with strengths in intelligence and leadership complementing his combat capabilities.