TV-Series
Description
Keisuke Yamanami is a prominent character known for serving as one of the two vice-commanders of the Shinsengumi. Physically, he is a tall man with a notable presence. His most defining visual traits are his green hair and his serious expression, which is a near-permanent fixture on his face. In the series, he is consistently depicted wearing the standard Shinsengumi uniform, complete with the two katanas that signify his rank and status as a samurai. He is also one of the few characters who is often seen wearing glasses, which contributes to the perception of him as an intellectual.

His personality stands in stark contrast to some of the more aggressive members of the group. Yamanami is characterized as a serious, quiet, and highly intelligent individual. He is known to be a man of thought, a theorist who values strategy and careful consideration over brute force. This analytical nature is symbolized by his constant companion, an abacus, which he carries with him. He finds the act of using the abacus to be soothing, a calming mechanism he employs when he feels himself becoming overwhelmed by a boiling rage. In his role within the Shinsengumi, Yamanami is often a voice of compassion and thoughtfulness, which frequently puts him in direct opposition to the stricter, more ruthless leadership style of his comrade, Toshizo Hijikata.

Yamanami's background is deeply rooted in the world of swordsmanship. Before the formation of the Shinsengumi, he was a student at the dojo of Isami Kondo, the man who would become the commander of the group. His knowledge of swordsmanship and the wider world of samurai battles is depicted as being quite extensive. His motivations are heavily influenced by his loyalty to Kondo, whom he respects immensely, and a deep-seated conflict with the violence inherent to the Shinsengumi's mission. This internal turmoil seems to stem from his involvement in the assassination of the former commander, Serizawa Kamo. Since that traumatic event, he has been hesitant to draw his own sword, admitting that bloodshed lost its appeal for him.

His role in the story is multifaceted. He is a key member of the leadership, involved in critical decisions such as helping to formulate new laws for the group following the Ikedaya incident. He is well-liked and respected by the rank-and-file members for his fair and gentle nature. He shares a particularly warm relationship with the young page, Tetsunosuke, and has a soft heart for children. This kindness extends to his personal life, where he maintains a romantic relationship with a courtesan named Akesato, whom he visits exclusively.

Throughout the narrative, Yamanami undergoes significant development as he grapples with the moral compromises of his position. His character is defined by a constant opposition to Hijikata, not born of animosity but of a fundamental difference in philosophy regarding leadership and the value of life. He shows a notable hesitation to engage in combat, a direct result of the psychological scars left by the assassination of Commander Serizawa. Despite his reluctance, Yamanami is no less capable as a warrior. He is an extremely gifted swordsman and a master of the Hokushin-itto-ryuu style of swordsmanship, possessing the skills befitting a vice-commander of the Shinsengumi.