Teng, also known as Tou, stands as a prominent military commander of Qin. Originally the loyal lieutenant and right-hand man to Great General Ou Ki, he inherits command of the Ou Ki Army after his lord's death at Bayou, reforming it into the Tou Army. Trained from age six in the unique and powerful Rasen swordsmanship style, he joined the Qin military years before the main events, becoming Ou Ki's longest-serving aide and participating in pivotal conflicts like the Battle of Ba Hills against Zhao's Rin Shou Jo and his vassals Gyou'un and Chou Ga Ryuu. Physically, Teng possesses a tall, strong build, light brown hair and eyes, and Western-like features including pale skin and a thin mustache with distinctive swirl patterns. He typically wears light-blue decorated armor and a green cape on the battlefield. His demeanor blends formal, dignified speech with calm analysis, even in dire situations, though combat reveals a serious and ferocious side. He occasionally exhibits wit, teasing subordinates like Roku O Mi with morbid humor or feigning their deaths. His patterned laughter, "Kokokoko," and perpetual smile diminished after Ou Ki's death, though he retains tactical composure. Teng's early career was defined by absolute loyalty to Ou Ki. He defended his lord during the fatal confrontation with Hou Ken at Bayou, later gripping Ou Ki's hands so tightly his fingers drew blood in silent anguish. Honoring Ou Ki's final wish, he assumed command of the army, with Ryuu Koku formally witnessing the transition. This event solidified his resolve to uphold Ou Ki's legacy while fostering new generations of Qin commanders. He maintains mentor-like dynamics with younger officers like Shin, Ou Hon, and Mou Ten, deliberately creating opportunities for their growth—such as acting as bait during the Choyou Campaign to test their capabilities against the Wei Fire Dragons. As a commander, Teng demonstrates versatile mastery in both martial and strategic arts. He wields Rasen swordsmanship with exceptional skill, enabling techniques like the Spectacular Spinning, where rapid arm rotations decimate rows of soldiers and shred incoming spears. His tactical acumen blends strategic formations with instinctual battlefield predictions, a style honed under Ou Ki. This earned him recognition as Qin's only general "without weaknesses," excelling in strength, leadership, and knowledge. In-universe evaluations consistently place his abilities above most peers: his strength surpasses Duke Hyou's, his leadership exceeds Mou Bu's, and his knowledge nearly matches Ou Ki's. Throughout Qin's campaigns, Teng leads critical operations. During the Coalition Invasion, he commands Qin's right wing against Chu, slaying general Rin Bu Kun and clashing evenly with the prodigious Kou Yoku. In the Fire Dragons of Wei arc, he orchestrates the Choyou Campaign as commander-in-chief, adapting tactics against the resurrected Fire Dragon Rei Ou and his formidable subordinate Ran Bi Haku. He strategically retreats to avoid Rei Ou's traps while entrusting key assaults to Ou Hon, Shin, and Roku O Mi, viewing the conflict as a crucible for Qin's future generals. Teng's development reflects a shift from unwavering loyalty to independent leadership. He transitions from Ou Ki's "Almighty Janitor"—a lieutenant with Great-General-level skills—to one of Qin's Six Great Generals. He balances preserving his lord's methods with nurturing new talent, explicitly framing battles as tests for successors capable of rivaling Qin's original Six Great Generals. His actions consistently align with Ou Ki's dream of unifying China under King Ei Sei, enforced through rigorous trials for the next generation of commanders.