Shunkai Matsuzaki is a supporting character in the anime Samurai Gun, a series set during a turbulent period of the Industrial Revolution in feudal Japan where a group of samurai fight against oppressive shogunate rulers. Matsuzaki is a skilled and fearless samurai who is deeply committed to protecting his country from those who seek to destroy it. He is guided by a strong adherence to tradition and the samurai code, which often directs his actions throughout the story. Proud of his heritage, he is determined to uphold the honor of his family and ancestors, a conviction that drives him to take considerable risks when confronting enemies, as he believes his duty to his country and people outweighs any fear of death.

Matsuzaki is known for his exceptional swordsmanship and his unwavering loyalty to his friends and allies. His personal history is marked by profound tragedy: he suffered the loss of his wife and child, events that fueled his dedication to the samurai cause and pushed him to further refine his combat skills. This background of loss and perseverance shapes his character, making him a figure of resilience and redemption. He is depicted as a reliable and responsible member of the group, often prioritizing the safety of the team and strictly adhering to authority and the established rules of the samurai. His loyalty is a central aspect of his personality, though it can also manifest as a dependence on his leader, Ichimatsu, and a tendency to seek reassurance from his companions when facing difficult decisions. Throughout the series, Matsuzaki embodies the spirit of the samurai tradition, willing to sacrifice everything for the greater good, whether that means fighting against tyrants, protecting the innocent, or opposing injustice.