The monk character in Samurai Reincarnation is Hozoin Inshun, a historical Buddhist warrior monk resurrected as a demon by the vengeful Amakusa Shiro. In life, Inshun was a master of the spear and a member of the Hozoin temple, but he constantly repressed his sadistic and violent urges beneath a veneer of monastic discipline. When Shiro offers him release from that restraint, Inshun accepts and is transformed into a demonic servant, his robes replaced with garments bearing skull motifs to reflect his newly unleashed nature. His personality shifts from a controlled monk to a gleefully cruel and predatory figure, taking pleasure in killing and assault without guilt. His motivation is the freedom to indulge the darkness he once suppressed, and he becomes one of Shiro's most vicious agents, participating in the assassination of key Tokugawa officials, including Yagyu Samon. Inshun's notable abilities include superhuman strength, speed, and his legendary spear technique, which he uses with savage efficiency. His role in the story is that of an early major antagonist among the resurrected demons, serving as a direct threat to the Yagyu clan. He meets his end at the hands of Yagyu Tajima no kami Munenori, who, despite being terminally ill, manages to kill Inshun with a Muramasa blade before Tajima himself succumbs to his illness and is subsequently resurrected. Inshun's lack of any redeeming conscience makes him a straightforward embodiment of unrestrained brutality, and his death marks one of the first victories for the heroes, though it comes at a heavy cost. He has no significant character development beyond surrendering to his base nature, and his relationship with Shiro is that of a servant eager to serve his master's destructive goals.