Shinomori Aoshi , known in Western order as Aoshi Shinomori in the English version of the anime, is a fictional character in the Rurouni Kenshin manga series created by Nobuhiro Watsuki. He is the genius young Okashira of the Oniwabanshū for Edo Castle. After the Meiji Restoration Shinomori alone was offered rankings in the military, however, instead of abandoning his comrades, he decided to work with them for Takeda Kanryū. This decision leads to the death of his comrades and his defeat by Himura Kenshin, which results in driving him mad. For the remainder of the series, Shinomori swears to kill Kenshin at any cost in order to gain the title of "the strongest" and bestow this title upon the graves of his fallen comrades.

Rurouni Kenshin: Meiji Swordsman Romantic Story is a Japanese manga series written and illustrated by Nobuhiro Watsuki. The story begins during the 11th year of the Meiji era in Japan (1878) and follows a former assassin from the Bakumatsu, known as Hitokiri Battosai. After his work against the bakufu, he becomes Himura Kenshin, a wandering swordsman who protects the people of Japan with a vow never to take another life. Watsuki wrote the series upon his desire to make a shōnen manga different from others published at the time, with Kenshin being a former assassin and the story taking a more serious tone as it continued.