This story is a reincarnation of Riboku from
the Kingdom manga/anime.
Kingdom Is one of the most underrated and unappreciated mangas out there. It is a truly great historical manga with amazing battles and genius generals. If you have never read or watched Kingdom then I advise you to go check it out you can thank me later.
Here is some information on Riboku for those who have never read or watched Kingdom. Riboku is one of if not the greatest general in the Kingdomverse and the man hasn't even picked up a weapon yet.
Ri Boku is a member of Three Great Heavens of Zhao and the leader of Ri Boku Army. Formely he also served as the Prime Minister of the State of Zhao.
Personality
A humble and kind person to those around him, he neither cares for fame nor glory. He truly wants to live on a peaceful farm, start a family and spend his days without war and pain. He also does not mind physical labor, actually prefering that work, as seen during his tenure in Gan Mon, and later during his exile after the Coalition Army's defeat.
As a strategist though, he is shown to be ruthless to his enemies and willing to utilize so-called underhanded means for victory. He allowed and commended the idea of attacking Ou Ki from behind in his duel with Hou Ken, and was willing to betray Qin despite alliance after their gain the strategic region Sanyou after defeating the Wei forces led by Ren Pa; realizing leaving Sanyou to Qin would become a massive threat to Zhao and the rest of the Warring States.
One of his most characteristic traits is his loyalty to Zhao and drive to protect his homeland, even at the risk of his own life. Although he considers himself a coward, he is willing to put himself in harms way for the sake of fullfilling his duty.
History
In his youth, Ri Boku lost half his entire family through the strife of war. Consumed by a bottomless sense of rage, he lost further friends and family in an unknown war after goading his battalion into recklessly charging into the heart of the enemy army. While he succeeded in killing the enemy commander, he was the sole survivor. Sometime after surviving as the last remaining soldier of his unit, he was chased by enemy soldiers deep into a forested mountain. Half dead and delirious from exhaustion, he encountered the mysterious figure, Hou Ken. While the cloaked figure initially threatened him with death for crossing his path, he spared Ri Boku after learning that the latter had lost his will to live. Hou Ken then spoke of the gods, which he cryptically referred to as the voices of the earth, told him that he still has a role to play and would be his guide to the answer he sought. Later, Ri Boku wakes up and finds himself somehow to be healed of injuries and wonders to himself if that man he saw was even real. But upon seeing the number of corpses everywhere, which were his pursuers slain, he realizes that was no dream. Afterward, Ri Boku left and distanced himself from the Zhao military due to weariness from the constant battles and decided to investigate the mysterious tribe knows as Bushin. Upon meeting at least one of their number, who focused on meditating, Ri Boku would learn more about their history despite being treated with contempt as an outsider.
Li Mu and Hai Yin
Ri Boku is a great general from Zhao before he made a name for himself, he was mostly known for subduing the Xiongnu threat to the north which constantly raids the northern part of Zhao, a feat which no other Zhao General had achieved before. In the past, he lost his parents and brothers in a war. Consumed by rage, he and his battalion recklessly defied orders and charged the enemy camp. While he succeeded in killing the enemy general, he was the only survivor. As a result, he realized that his reckless act of vengeance led to further loss of friends and family. Due to this, he learned to value the lives of his subordinates and became more patient as a commander. Later, he is sent to northern Zhao as a general and met Kaine, who would become one of his trusted subordinates.
Upon first arriving in Gan Mon province during his first tenure as a general, he was able to stop Xiongnu raids by simply avoiding conflict. Instead of facing them, he ordered that the villagers evacuate with all their livestock and supplies while taking shelter inside the walls of Gan Mon castle during the attacks. When pressured by the veterans as to why he took this course of action, he explained that Gan Mon was mostly open ground, enabling the Xiongnu to use their cavalry to their fullest potential. In addition, Gan Mon did not have hundreds of thousands of troops or specialized soldiers needed to crush the raiders in a head-on battle.
Initially, Kaine did not get along with him. Along with her archer friend Zhao, she did not like this strategy and always wanted to face them head-on instead of cowardly staying in safety, seeking revenge for her family's death at the hands of the Xiongnu. Ri Boku was forced to strike her unconscious and imprison her for a day to prevent her from risking her life recklessly. Over time, she soon came to realize that Ri Boku had suffered the same past as her; having been orphaned in a war and losing his brothers and of how his reckless pursuit of revenge resulted in his entire battalion being wiped out. Instead of choosing to remain the path of revenge, he chose to become a strategist in order to save as many lives as he can. Still believing Kaine still resented Ri Boku, Zhao reported to Kanten that Ri Boku was neglecting his duties. As a result, so Ri Boku was recalled back to Kanten for questioning and was replaced by yet another hot-headed commander. The result is devastating, Gan Mon Castle was overrun, the replacement general was killed, most Zhao's forces in the region were killed, and refugees were forced to flee south. In the aftermath of a battle, Zhao was killed and besides Kaine, there were only a handful of survivors. Meanwhile, Kaine was wounded, regretting what Ri Boku's exile did to Gan Mon. Soon after Zhao and her comrades were buried, Ri Boku returned and started anew; much to Kaine and the survivors' relief. Sometime afterward, he and Kaine were able to amass enough skilled soldiers to wipe out the next army of Xiongnu raiders; a battle that Yo Tan Wa witnessed the aftermath of upon setting out on her own campaign against the horsemen tribes.
It is also shown that fifteen years before the Koku You Campaign that Ri Boku was attached to Zhao's Zan Men Army to oversee a truce and prisoner exchange during the Tragedy of Rigan. During this time period, he observed Ki Sui for the first time.