Musashi is the main protagonist of the anime Orient. He is a fifteen-year-old boy with spiky red hair and light blue eyes. His parents were simple farmers who were friendly with the Kanemaki family despite the widespread anti-bushi sentiment in their village of Tatsuyama. After his parents died, Musashi was passed from family to family until he went to live with relatives who threatened to beat him if he tried to interact with them. They promised to fully accept him only if he threw a stone at Jisai Kanemaki and insulted him. Desperate for belonging, Musashi did so, but afterward he went to the Kanemaki residence to apologize. Jisai forgave him, explaining that he was grateful Musashi had befriended his son Kojiro despite the social stigma. Jisai took Musashi in and raised him alongside Kojiro, teaching both boys swordsmanship and battle strategy.

Musashi is a very cheerful person who always cares for others. He is highly determined, having firmly resolved from the start of the series to become a bushi alongside his friend Kojiro. However, he initially concealed this ambition because he feared the judgment of those around him, which caused Kojiro to misunderstand him. When he faced an oni for the first time, he revealed his true dream and fought alongside his friend. Musashi demonstrates great appreciation and concern for those he considers his friends. He is quick to form bonds, partly because of the loneliness he experienced in his youth. This background also made him perceptive; he is skilled at reading people's mannerisms and understanding their motivations, though he is not always accurate with certain individuals.

Musashi's primary motivation is to become a bushi and, together with Kojiro, form the greatest band of bushi in the land. He seeks to fight against the oni, the demonic beings that rule over Japan and have enslaved humanity. He is driven by a desire for freedom and justice, and he refuses to accept the subjugation of people under the oni's rule. His unwavering determination pushes him forward even when others doubt or hesitate.

In the story, Musashi is the central figure around whom the plot revolves. He is a founding member of the Kanemaki Bushi, the band he forms with Kojiro and later Tsugumi Hattori and other allies. His journey takes him from the mines of Tatsuyama, where he worked alongside brainwashed villagers, to confrontations with powerful oni and the formation of his own bushi group. He gradually gains recognition from established bushi leaders and becomes a key player in the larger struggle against the demonic forces.

Musashi's most significant relationship is with his childhood friend Kojiro Kanemaki. The two share a deep bond and a shared dream of forming the best bushi band. Kojiro is more cautious and self-doubting, often comparing himself to Musashi, while Musashi's confidence and drive push them both forward. Another important relationship is with Tsugumi Hattori, who becomes a close friend and fellow member of the Kanemaki Bushi. Musashi and Kojiro rescue her from her abusive adoptive father and bring her into their group. Musashi also shares a strong bond with Jisai Kanemaki, who became his guardian and mentor after his parents died. Jisai taught him swordsmanship and shaped his understanding of what it means to be a bushi.

Throughout the series, Musashi develops from a boy hiding his true ambitions into a confident and skilled warrior leading his own band. He faces moments of humiliation and defeat, but each setback fuels his resolve to grow stronger. His experiences on the battlefield and his interactions with other bushi help him mature and refine his goals.

Musashi's notable abilities include his swordsmanship, which he trained in under Jisai Kanemaki from a young age. He is a determined and capable fighter, able to stand against powerful oni and other foes. He also shows strategic thinking and the ability to adapt quickly in battle. His greatest strength, however, is his unwavering spirit and his capacity to inspire loyalty and friendship in those around him.