Mizu: She is a fierce and driven protagonist motivated by a strong desire for revenge. She is a half-Japanese, half-European woman who disguises herself as a man to pursue her quest against four white men, potentially including her father, who she believes caused her shame. While initially appearing emotionless and driven by a need for vengeance, she gradually shows glimpses of compassion and is capable of forming bonds with others.

Taigen: He is a promising but arrogant swordsman. He is initially his pride, ambition, and resentment towards Mizu, stemming from childhood interactions. He harbors a strong desire for revenge after being humiliated in a duel that also ends his engagement with Akemi. Over time, Taigen demonstrates some honorable tendencies, such as refraining from killing Mizu after a fight and ultimately admitting some level of loyalty to her. He also seeks out Akemi, showing a desire for a happy future with her, contrasting his initial hubris and he used to bully Mizu but now he became friends with her

Abijah:He is a ruthless and cunning Irish smuggler with violent tendencies, driven by a desire to break open Japan's borders to Western influence. He sees himself as a victim of discrimination and uses this feeling to justify his actions, even though he is also manipulative and calculating.

Ringo: He is a kind, cheerful, and compassionate character, despite being born without hands. He is a loyal friend to Mizu, constantly looking out for her and acting as her conscience. he is also a skilled soba maker and has a strong sense of honor, embodying the ideals of a true samurai.

Akemi: She is strong-willed, resourceful, and intelligent woman who is determined to gain control of her life and escape the confines of her society. She is depicted as courageous and confident, but also initially somewhat naive and lacking in experience, especially when it comes to the machinations of power. As the story progresses, her character evolves, and she becomes more calculated and strategic, even if some see this as a reflection of her adapting to a cruel world and she is the soon-to-be wife to Taigen

Daichi: He is a skilled swordsman and a respected leader, but he can also be stubborn and possessive and a natural leader, capable of inspiring and motivating his clan He is deeply loyal to his family and his ideals, often putting their well-being before his own and he is the father to Akemi