Ookubo Tetsuma is former student of Katsu Kaishu who had a plot to steel the map from his master and was supported in this cause by Lord Yoshinobu who lost his family years ago. He was defeated by Kenshin Himura who convinced him to give up. Tetsuma uses a Western style sword used for fencing. He learned the art of fencing while studying in England. Thanks to his knowledge and skills, despite being young, Tetsuma has a solid base to be a high-ranking government official one day and mentions working in an office at the present time. (Source: Rurouni Kenshin Wikia)