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The Red Onimusha, he is one of the most proeminent protagonists in the Onimusha series, he is human granted with magical powers by the Oni Clan.
A lone swordsman travelling around Japan in search for his rival. Despite his somewhat quiet and calm behavior, often perceived as cold and indifferent, he has a very strong sense of justice and loyalty. He is determined to save Yuki-hime of the Saito clan from Nobunaga, who have been resurrected after signing a pact with demons. She is kidnapped by two genma monsters and finds difficult to defeat them until he is overpowered by a giant demon called Osiric. In the brink of defeat and death, he is visited by the 12 gods of th Oni cla, who had relinquished the power to destroy the genma and syphon their souls into a mystical gautlent given to him. After dispatching Osiric, Samanousuke would fight against the genma swarm over Japan, collecting several weapons to kill his enemies, such as Raizan and others.
He confronted Nobunaga Oda, who had become undead by the Genma Lord (and God of Light) Fortinbras, who wanted him as his general, and plotted to use Yuki-hime as sacriffice to him, so he can drink her blood from her skull and become immortal and invencible. Even though Samanosuke ruins their plans and rescues the princess along the young kid Yumemaru, he fights and kills Fortinbras, but he later ressurrects as monster and fights with Samanousuke, making blood drips from his mouth and toughing the gautlent, becoming the Onimusha and having the necessary power to kill Fortinbras for good (at least for the time being as for much time later, he would return but to fight another hero...) but not before catching a glimpse from Nobunaga, and what he would do in the future.
Even with Fortinbras' defeat, Samanosuke would spend about 10 years in self-imposed exile, afraid of his own Oni power could hurt anyone close to him until he was found by Kaede. Around that time, Nobunaga laid waste over Japan with his army but he was (apparently) defeated and killed by Junbei Yagyu, but he did not had the power enough to seal Nobunaga's dark soul. 6 years later, Nobunaga rises again but this time Samanosuke take stand to protect mankind against his plans of conquest. After disabling a Genma tank which could have given reiforcements for Nobunaga's forces, along with his adoptive father Mitsuhide Akechi at Honnoji Temple, they laid waste to Nobunaga's forces, surrounded by their armies.
Samanosuke would later find Nobunaga inside Honnoji and confront the Oda Family head retainer, Ranmaru Mori. After a brief fight, Samanosuke defeats Ranmaru, and later take on Nobunaga but the villain is to much for him and before he can lay the finishing blow, a strange field covers Samanosuke and transport him to a unknow location...
He discovered he was transported not only to a distant future, but a diferent place as well, he was cast in Paris, France in 2004, around that same time, a man named Jacques Blanc was also transported to Samanosuke's time in Japan during the Warring States in 1582, about 10 days before the incident in Honnoji's temple, around that time Jacques was also given the magical power to fight against the genma and help the alternate Samanosuke, while the Samanosuke in the present, gained help from Michelle Aubert, Jacques's fianceé, to fight against a genma army released by the genma scientist Guildenstern in France. After much sttrugle, the time folder around Samanosuke and Jacques were corrected, and as result the genma slaughter in France never took place. Samanosuke returned to his own time, but not before been warned that his younger self was killed by Nobunaga when Jacques defeated him.
Returning to his own time, Samanosuke confronts Nobunaga and uses the gauntlet from his younger self to become once again the Onimusha and fight a titanic battle against Nobunaga. After defeating him, Samanosuke used the gautlent to absorb his dark soul inside it, finishing the villain for good. With his journey over, Samanouske would start a new mission: to seal the Oni gautlent and make sure Nobunaga whould never rise again from his death.
He disappeared without leaving a trace behind and no one looked up for him again, but around 15 later, Nobunaga's insidious vassal Hideyoshi Toyotomi started a new campaign, and evil started to spread, as he searched for a way to bring the Genma Lord, Fortinbras, back to life, after he was killed around 30 years back. A monk called Tenkai Nankobo helped a new hero called Soki to fight agains the genma, as he was the reincarnation of the God of Darkness. During the credits of the final game, Onimusha Dawn of Dreams, is revealed Tenkai is none other than Samanosuke Akechi, after 30 years of search, he seens to have succeded in his quest to seal the Oni gauntlet, but as result, he lost all the magical power he once had, but still, he shows the same fighting prowess he had when he was younger. He appears to have turned to new grip as he lives in the templo of Mt. Hiei in a way of peace.