Shinomori Aoshi, born in January 1853, is the exceptionally gifted leader of the Oniwabanshū, a secret ninja corps that once served the Tokugawa shogunate. Raised within the organization from childhood, he became Okashira at fifteen. After the Meiji Restoration, he refused government positions to stay with his struggling subordinates, leading them to serve the corrupt industrialist Takeda Kanryū. The tragic deaths of his four closest comrades—Beshimi, Hyottoko, Hannya, and Shikijō—resulted from Kanryū’s betrayal. Their loss propelled him into a consuming quest to defeat Himura Kenshin, believing victory would grant him the title of the strongest and honor his fallen men. Initially emotionally detached and analytical, his demeanor concealed deep loyalty and compassion. He helped raise Makimachi Misao from childhood, displaying protective guardianship; though Misao developed romantic feelings for him, his reciprocal sentiments remain undefined, though he consistently prioritizes her safety. Following his defeat by Kenshin in Tokyo, he isolated himself for intensive training, adopting a dual-kodachi fighting style. He later allied with the antagonist Shishio Makoto in Kyoto for another chance to fight Kenshin, during which he severely injured his mentor Okina and temporarily alienated Misao. His rematch against Kenshin ended in decisive defeat, and Kenshin’s counsel led him to recognize how his vengeance dishonored his comrades’ sacrifice. In the Jinchū arc, he returned to Tokyo with Misao to deliver Yukishiro Tomoe’s diary, aiding Kenshin against her brother Enishi. He deduced that Enishi faked Kaoru’s death using a doll crafted by the puppeteer Gein, whom he defeated. He joined the assault on Enishi’s stronghold, neutralizing one elite guard. After Enishi’s defeat, he fulfilled a promise to share tea with Kenshin, symbolizing reconciliation and his commitment to peace. He resumed leading the Oniwabanshū, managing the Aoiya inn in Kyoto and tending to his comrades’ graves with Misao. His combat emphasizes precision, speed, and analytical prowess, employing kenpō alongside kodachi techniques. Signature moves include Goko Joji, Ryūsui no Ugoki, and Kaiten Kenbu Rokuren. His senses allow minute spatial calculations and detection of distant sounds.