Kenshin Gekko

Shinta (信太) or simply Kenshin Gekko (月光謙信, Gekkō Kenshin) is known as the legendary hitokiri of the Meiji Revolution, Himura Battōsai (緋村抜刀斎).

Paul Gekko Arc
Kenshin is born into a peasant family under the given name of "Shinta". After losing both his parents to cholera by age seven, 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 skilled swordsmanship master named Hiko Seijūrō. He renames the boy "Kenshin", as the name 'Ken' (sword) and 'Shin' (heart) were more fitting for a swordsman. Kenshin is sent to Kyoto and assigned the role of an assassin, sharing the common goal of the Ishin Shishi upon the Tokugawa shogunate. Within the first six months of his career, he kills over 100 people, and eventually becomes known as the "Hitokiri Battōsai".

Ventus Arc
Paul Gekko found the Member of the Shadow Clan and him in the Rusty Village. At one point, he comes face to face with 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 act as a married couple to keep anyone from finding out Kenshin's true identity as an assassin 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. She realizes that all along they had actually used her to create Kenshin's weakness. Meanwhile, Kenshin runs off to find his wife, but is ambushed by Yaminobu ninjas and is severely wounded. He manages to defeat them and eventually finds Tomoe with the leader of the Yaminobu. 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. Before dying, her last words come to reveal the dark tragedy that ultimately leaves Kenshin forever changed. Although his has kept his promise and fulfills his duty as a swordsman of peace, many of his inner scars still come to haunt him, from his repressed hitokiri personality coming out in times of heavy conflict, to the heavy trauma and unremedied pain that keeps him distant from even his closest friends, and fearful of the consequences his past reemerges should they be dragged into them. New enemies such as Aoi of an Oniwabanshū turned mercenary thug criminal group, comes to bear a near vendetta rivalry to claim his life in order to mark their pride in history as the strongest of the Bakumatsu's days, and Jinei Udoh nearly comes to make Kenshin break his vows and spill blood after holding Kaoru hostage in threat of her life, before leaving behind a dark memento and reminder that the past of a warrior will always come to haunt him and leave no other path open to him than one of destruction.