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Hitokiri Battousai(Kenshin Himura) - Rurouni Kenshin

(I am talking about the Battousai not normal Kenshin, when he was a weapon of the government)

Kenshin is born into a peasant family under the given name of "Shinta". Soon his parents die, and he is sold into slavery. The slave-traders' caravan is attacked by bandits who kill all of the peasants except for Shinta, who is saved by a swordsmanship teacher called Seijūrō, who renames the boy "Kenshin", as the name 'Ken' (sword) and 'Shin' (heart) were more fitting for a swordsman. After a few years under Seijūrō's guidance, Kenshin decides to abandon his training to protect people as an assasin of the Chōshū clan. There he shares the common goal of the Ishin Shishi upon the Tokugawa shogunate and soon becomes known as "Hitokiri Battōsai" due to the mass murders he commits. At one point, he meets a woman named Yukishiro Tomoe, who initially wanted to avenge the death of her fiancé, whom Kenshin had killed, but falls in love with him instead and starts a romantic relationship. After the crisis suffered by the Chōshū clan in the Ikedaya Jiken, both Kenshin and Tomoe get married and flee to a remote village.

Sometime later, Tomoe meets with the leader of the Yaminobu, a fictional pro-Shogunate covert network of ninjas that had formulated a plan to assassinate Kenshin and use her to create his weakness. Meanwhile, Kenshin runs off to find his wife, but is ambushed by Yaminobu, who although are defeated, they manage to severely wound him. In a desperate attempt to defeat the leader, Kenshin blindly swings his sword, killing both his assailant and Tomoe, who jumps in at the last minute to save Kenshin from a fatal attack. Tomoe's knife flies into the air and coincidentally slashes Kenshin's already scarred cheek, creating the famous X-shaped scar across his left cheek. Following the death of Tomoe, Kenshin's leader, Katsura Kogoro, reassignes him as a guerrilla swordsman to protect the Imperialists and after the end of the Bakumatsu, he leaves Kyoto.

Kenshin is a practitioner of the Hiten Mitsurugi-Ryū. also referred to in the series as "Ultrasonic Sword Stile", a fictional ancient sword art. Kenshin's mastery of the Stile allows him to possess superhuman speed and reflexes, study and predict his opponent's movements in battle, as well as perform many powerful sword techniques
Among several of his Hiten Mitsurugi-Ryū and battōjutsu skills, Kenshin can utilize Shinsoku, which allows him to quickly overpower and dispatch opponents with his sword before they have time to react. Although most of his techniques were originally intended to have deadly effects, Kenshin fights using his sakabatō, a katana that has the cutting edge on the inwardly curved side of the sword (in contrast to a normal katana, where the outwardly curved side of the sword is sharp, while the inwardly curved side of the sword is blunt), since he desires not to kill anyone.

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