Harada Sanosuke

 was a Japanese warrior ("samurai") who lived in the late Edo period. He was the 10th unit captain of the Shinsengumi, and died during the Boshin War.
Background.
Harada was born to a family of "chūgen", or low-ranking quasi-samurai, who served the retainers of the Iyo-Matsuyama Domain (now the city of Matsuyama). He trained in the spear technique of the "Hōzōin-ryū" style, and usually used that weapon in battle instead of a sword. During his time in Matsuyama, he was once ridiculed by a Matsuyama retainer as being a peon who was unfamiliar with how to properly commit seppuku. Harada, wishing to prove the man wrong, immediately drew his sword and attempted to commit seppuku; however, the wound was shallow, and he survived. Harada later boasted of his scar to his fellow Shinsengumi men, and the incident of his near-disembowelment is said to be the origin of the family crest he chose, which depicted a horizontal line within a circle (). Later leaving the Matsuyama domain's service, he went to Edo, and trained at Kondō Isami's Shieikan "dōjō".
Shinsengumi period.
In 1863, Harada, together with Kondō and others associated with the Shieikan, joined Kiyokawa Hachirō's Rōshigumi and departed for Kyoto. Shortly after reaching Kyoto, the Rōshigumi was disbanded and most of its members returned to Edo. Harada, Kondō, Serizawa Kamo and several others remained behind and formed the core of the group known as Mibu Rōshigumi, which later became the Shinsengumi.
Later, Harada became the Captain of the Shinsengumi tenth Unit. He was trained briefly under a dojo run by Tani Sanjūrō, whom he introduced into the Shinsengumi. In 1865, Tani became the seventh Unit Captain. In Kyoto, Harada married a local woman named , and briefly had a private family residence near the Shinsengumi headquarters at Nishi-Honganji. The couple had a son, whom Harada named , taking the second character from the shōgun 's name. Harada was very trusted by vice-commander Hijikata. He was involved in many of the crucial missions the group faced and was very likely involved in the Serizawa Kamo (original commander of the Shinsengumi) assassination. He was involved in the Uchiyama Hikojirō's assassination, the Ikedaya incident, and the Sanjo Seisatsu incident.
Harada became a hatamoto, together with the rest of Shinsengumi, in June 1867. At one time he was accused (by former Shinsengumi member Itō Kashitarō) as one of the assassins of the Sakamoto Ryōma and Nakaoka Shintarō who were murdered on December 10, 1867. The truth behind the incident remains unclear, but according to the confession of the Tokugawa retainer Imai Nobuo later in 1870, the assassins were men of the Mimawarigumi (another Tokugawa-affiliated unit) under the hatamoto Sasaki Tadasaburō.
Later on December 13, 1867, he, Nagakura Shinpachi and several Shinsengumi members were involved in the ambush of Itō Kashitarō's Goryō Eji Kōdai-ji faction during the Aburanokōji incident.
In January 1868, Harada, together with the rest of the Shinsengumi, fought at the Battle of Toba–Fushimi against the Imperial forces. He and his family subsequently left the Kyoto region for Edo. In March, he joined the (the renamed Shinsengumi) advance on Kai Province, and fought at the Battle of Kōshū-Katsunuma, however, the unit was defeated and forced to retreat back to Edo. In the wake of this defeat, Harada and Nagakura Shinpachi left the Kōyō Chinbutai after disagreements with Kondō and Hijikata. According to Nagakura's version of events, Kondō wanted the surviving men to become his retainers; Nagakura, Harada, and a few others staunchly refused. Nagakura and Harada, taking with them some other Shinsengumi members, joined with a group of former Tokugawa retainers to form a new unit, the Seiheitai. Seiheitai left Edo shortly after Edo Castle's surrender, and headed north, hoping to take part in the fighting that was moving northward, toward Aizu.
Death.
After Seiheitai's departure from Edo, Harada, wishing to be with his wife and child, returned to the city. However, he was unable to leave the city, and so he joined the Shōgitai, which also sided with the Tokugawa regime. Harada fought at the Battle of Ueno, where he was severely wounded by enemy gunfire. Two days later on July 6, 1868, he died of his wounds, while at the residence of the hatamoto, Jinbo "Yamashiro-no-kami".
There is a rumor that Harada did not die in 1868, but he survived and travelled to China and became a leader for a group of horse-riding bandits. There were reports that an old Japanese man came to the aid of the Imperial Japanese Army in the First Sino-Japanese War, and claimed to be Harada Sanosuke. This was reported in a newspaper in 1965, but remains unsubstantiated.
In popular culture.
Harada Sanosuke appears in Shiba Ryōtarō's novels "Moeyo Ken" and "Shinsengumi Keppuroku".
He is depicted in NHK's Taiga drama series "Shinsengumi!" (played by Yamamoto Taro.)
In addition, Harada appears in the anime series "Peacemaker Kurogane", as well as in the manga it was originally based on, "Shinsengumi Imon PEACE MAKER" and "Peacemaker Kurogane". He is also featured in "Kaze Hikaru" (manga), "Hakodate Youjin Buraichou Himegami" (manga), "Getsumei Seiki" (manga) and "Bakumatsu Renka Shinsengumi" (video game series.)
Harada appeared in flashback sequences in "Rurouni Kenshin" and also served as an inspiration for the character Sagara Sanosuke.
Harada Sanosuke appears in anime series "Hakuouki Shinsengumi Kitan".