Suishinshi Masahide is an anthropomorphic sword fighter known for his reserved and introspective nature. He typically wears a hat, reflecting his origins as an Edo-period swordsmith celebrated for exceptional craftsmanship. His swords, including the nationally treasured "Kanesada," were historically wielded by samurai and featured intricate designs.

Within narratives, he displays a strong sense of duty, prioritizing the protection of allies and steadfast adherence to his personal values. His interactions involve offering counsel to comrades and maintaining a quiet, observant presence during conflicts. He exhibits an analytical approach, tackling situations with logical reasoning and a preference for factual analysis over emotional responses, aligning with interpretations of his personality as an Enneagram Type 5 (the Investigator), emphasizing independence and knowledge-seeking.

Suishinshi Masahide appears in the Setsugetsuka film trilogy as one of 14 newly introduced swords, fulfilling a supportive role within group dynamics and participating in combat missions alongside other personified swords.