Kozo Kanamori

Kozo Kanamori is a highly accomplished swordsmith hailing from the secretive Swordsmith Village, a vital sanctuary that keeps the Demon Slayer Corps armed and ready. In a world plagued by demons in Taisho-era Japan, Kozo is one of the few masters capable of turning raw Scarlet Ore and Sunlight Sand into deadly Nichirin blades. To preserve the village's anonymity and protect himself from demon retribution, Kozo always wears the traditional wooden Hyottoko mask, characterized by its comically twisted, blowing mouth. Underneath the mask, he possesses long black hair parted in the middle and a surprisingly lanky frame. He is a happily married man, sharing a deep, harmonious bond with his supportive wife, Koito. Kozo is widely known for his professional adaptability and deep empathy. When Tetsuido, the original swordsmith of the Mist Hashira Muichiro Tokito, passed away from heart illness, Kozo inherited the task. Instead of forcing his own style, Kozo meticulously studied Tetsuido's journals to understand Muichiro's unique physical state and fighting habits, crafting a blade that perfectly suited the young Hashira. He also forged the iconic dual swords for Inosuke Hashibira. While Kozo is typically polite, soft-spoken, and incredibly gentle, he harbors a terrifyingly explosive temper. He views his swords as his own children. If a slayer mistreats, chips, or breaks his work—as Inosuke did by intentionally denting his brand-new dual swords with rocks—Kozo's polite facade completely shatters. He will fly into a comical yet murderous frenzy, screaming theatrical threats, flailing his arms, and chasing the culprit with whatever tools are at hand. Despite this volatility, his loyalty is absolute; during the tragic Upper Moon attack on his village, Kozo bravely shielded a focused Hotaru Haganezuka from demon attacks, proving his courage and devotion to his craft and peers.