Kakushi

The Kakushi are a brigade of attendants who handle the many tasks that keep the Demon Slayer Corps functioning. Their duties include giving first aid to slayers on the battlefield, clearing the site once a fight is over (Chapter 44), carrying the injured to the Butterfly Mansion to recover, and serving as staff there to care for residents and patients. They also mend the slayers' uniforms and ferry people to and from the Swordsmith Village.

The kanji used for their name carries the sense of hidden or concealed, along with shades of pity and sympathy, which suits the quiet, supportive nature of their work.

Little is known about how the Kakushi recruit or how many of them there are, which lends the group an air of mystery. Some members are retired slayers, or slayers injured badly enough that they can no longer fight. Others are people who failed the Final Selection but still wished to serve the Corps in some capacity and joined the brigade instead.

For their work they wear dark versions of the standard slayer uniform, with a modified gakuran jacket whose longer hem and puffed sleeves allow free movement and the brigade's kanji inked on the back. Black stretchy fabric secures their sleeves and hakama, and they wear white jika-tabi with red flats. To guard their identities, they cover their heads and wear a paper-like mask split into front and back sections so they can still speak and breathe.

The brigade traces its origins to the Sengoku period, when the traitor Michikatsu Tsugikuni became a demon, killed the Corps leader of his era, and delivered the leader's head to Muzan Kibutsuji. After that betrayal, far greater effort went into concealing the leader's residence, and the Kakushi were formed. Among the named members are Goto and Masao Maeda. With Muzan's defeat and the disbanding of the Corps, the Kakushi ceased to exist.