Kiyo's older brother who bears the burden of their family's expectations, outspoken and critical of unfair systems but ultimately compliant with his parents' wishes despite his personal dreams.

Kiyo's father who is deeply rooted in familial duty and tradition, having moved from Japan to work off his father's debts, and later pressing his sons to support the family while maintaining moral integrity.

Kiyo's mother, known for being argumentative and firm in her beliefs about filial duty, yet supportive and caring for her sons in their different life choices.

An older friend of Kiyo whose family is ostracized due to their living situation and circumstances, highlighting cultural conflicts in perceptions of responsibility for one's family.

The family's elder known for her outsider status due to past actions but empathetic and selfless, serving as a critical familial support when Kiyo's mother falls ill.

A teacher in Kiyo's life who introduces the young boy to radical ideas that challenge traditional norms and inspires him to question the plantation system and familial obligations.

The white plantation overseer who represents the power dynamics and authoritative system that govern plantation life, known for monitoring the education to prevent subversive ideas.

A religious leader who plays a pivotal role in advocating for the Japanese-American community's freedoms and safety post-Pearl Harbor, showcasing the importance of allyship.

A language teacher and respected member of the Japanese Camp community who offers guidance to Kiyo and Tosh, balancing traditional values with an understanding of modern perspectives.