Takimi, Shigure

A veteran samurai who fought valiantly for the Aizu clan during the Meiji Restoration, serving as one of the commanders for their sabotage missions and assassinations. He is also the master and creator of the Psychi Kamina sword style. However, during the war, Shigure lost his best friend and comrade, Gentatsu (unknowingly to the hands of the Hitokiri Battousai during an attempted raid on the Choshu clan leaders, who were planning an alliance with a rival clan at Suzuya).
Shigure has burdened himself with Gentatsu's death and tries to make amends by housing and taking care of Gentatsu's younger sister, Toki. However, in secret, along with one of the other Aizu clan generals (a man named Kajiki), he has gathered survivors of the Aizu army and plans a new restoration to eliminate the Meiji government and to make Japan as he and Gentatsu envisioned it should be.
He befriends Kenshin Himura after hastily dealing with some foreign sailors who were harassing Toki. Kenshin is warned by Hajime Saito about Shigure's dealings and activities. Kenshin brushes the warning off until he encounters Shigure in the midst of an assault on the British embassy. They fight, and then Shigure recognizes the swordplay Kenshin uses and realizes Kenshin murdered Gentatsu, which enrages him and makes him more intense. The battle is cut short as Shigure retreats due to his army being overwhelmed.
Kenshin follows to a nearby fort where the Aizu remnants have barricaded themselves. With help from Sanosuke Sagara, Kenshin confronts Shigure one last time. After a while, a teary-eyed Toki runs in to embrace him, telling him he's had enough fighting. Shigure succumbs to his emotions and breaks down, saying that Kenshin had honored Gentatsu's death more than him.
A squad of imperial police led by Captain Tomino (a police officer who had conspired with Kajiki to betray Shigure in order to get promoted) bursts into the establishment, firing at any opposition. Shigure shields Toki, taking several bullets to his back. Shigure dies quickly afterwards whilst trying to apologize to Toki. Kenshin explodes violently, nearly reverting to his Battousai form, and charges towards Tomino, resisting at the last second to avoid killing Tomino. Tomino's superior enters and arrests Tomino, meanwhile Kajiki's attempt to escape the situation is halted when he is killed by Hajime Saito.