Originally from Qi, Mou Bu moved to Qin with his father Mou Gou after Mou Gou suffered repeated defeats against Zhao's Ren Pa. Establishing the Mou family in Qin, Mou Gou found military success. Mou Bu joined the Qin military, rising swiftly through the ranks and aligning with Chancellor Ryo Fui's faction as one of the Four Pillars. He married, fathering two sons, Mou Ten and Mou Ki, and entrusted the elder son's upbringing to the family vassal Ko Zen. Mou Bu initially displayed extreme arrogance and a volatile temper, openly dismissing revered figures like Great General Ou Ki as relics of the past. He proclaimed himself the strongest warrior in China and aggressively advocated reviving the Six Great Generals system to lead it. His brashness erupted during political meetings, where he interrupted protocols and insulted officials such as Ri Shi. A pivotal shift occurred during the Battle of Bayou, where Mou Bu served as Vice General under Ou Ki. Spearheading the vanguard, he crushed Zhao forces through sheer power but recklessly pursued enemy commander Hou Ken into a narrow canyon trap set by Zhao strategist Chou Sou. This charge decimated his troops. Witnessing Ou Ki's final stand and sacrifice profoundly impacted Mou Bu, leading him to acknowledge his errors and forge deep respect for the late general. This tempered his arrogance into a more measured, yet intensely fierce, fighting spirit. Following Ou Ki's death, Mou Bu's demeanor evolved significantly. He adopted greater humility, treating peers like Tou as equals. Though still favoring direct assaults, he reluctantly incorporated strategy when necessary, inspired by Ou Ki's balance of offense and defense. In the Sanyou Campaign, he inquired about Ou Ki's glaive, expressing interest in wielding it should Shin ever abandon it, reflecting his enduring reverence. His military prowess solidified during the Coalition Invasion. Employing the complex Assault Echelon tactic—requiring sustained momentum—he defeated Chu general Kan Mei. This victory, achieved using tactics devised by his sworn brother Shou Hei Kun, showcased his adaptability despite his preference for brute force. Later, during Qin's invasion of Chu, uncontrollable rage defined a critical moment: when Chu general Han Ming injured his son Mou Ten, Mou Bu erupted, cleaving Han Ming's face and crushing his skull, cementing his promotion to Great General. Mou Bu's relationship with Shou Hei Kun, a former Chu prince, remained complex. Childhood friends and sworn brothers, their bond fractured when Shou Hei Kun defected to Chu. This conflict culminated during Qin's conquest of Chu. Serving under Wang Jian, Mou Bu killed the Chu king Lord Changping (Shou Hei Kun), ending the Chu state. His internal conflict over this act was explored in a pre-serialization one-shot. Physically, Mou Bu possessed immense height and musculature, standing as the tallest among Qin's generals. His appearance featured spiked dark brown hair, a short goatee, and an intense demeanor. He typically wore golden armor with a green cape in battle and a dark jade green robe in court. Mou Bu's legacy extended through his leadership in southern campaigns against the Hundred Yue tribes and the establishment of the Kuaiji commandery, expanding Qin's territory after unification.