Tetsutani

Like the other smiths, Tetsutani hides his face behind a Hyottoko mask, distinguished by the absence of eyebrows and a set of forehead wrinkles in their place. His outfit features a floral-patterned haori in blue, loose white trousers gathered above the ankles, and a white cloth wound around his head.

Only a little of his character comes through. He seems deeply loyal to the village, introduced clutching blades to safeguard them through the destruction, and he proves compassionate, weeping when Tanjiro embraces the sister he feared dead and declaring that the smiths could never have forgiven themselves had she perished. He also lends a hand to the injured slayer after he collapses.

In the latter part of the Swordsmith Village attack, Tetsutani conceals himself in brush on the village edge with Tetsudoji and Tetsumotonaka, watching over a stock of swords. They are spotted by Urami, the manifestation of Upper Rank Four Hantengu's resentment. Without arms and badly injured, the giant demon hunts humans to rebuild his sapped regeneration and gives chase as the smiths run.

A wounded Tanjiro, given a blade by the Mist Hashira Muichiro Tokito, overtakes Urami and beheads him, only for the demon to regrow and press on. Daybreak ignites both demons, yet Urami's sheer size lets him shrug off the sunlight long enough to menace the smiths, so Nezuko kicks Tanjiro loose to save them at her own cost. Tanjiro shears off Urami's arms, frees the smiths, and bisects the demon to reveal and slay Hantengu's true body. Grieving his sister, Tanjiro is told by Tetsumotonaka and Tetsutani that she survived, and the pair carry him to her. Tetsutani steps forward to thank the siblings, repeating that they could never have lived with her death. When Tanjiro faints, Tetsutani is startled and rebukes Tetsudoji for proclaiming him dead. He is presumed to have moved to a contingency village afterward and is implicitly referenced when Gyomei Himejima praises Tanjiro for prioritizing the smiths.