Replying...
Intro. (you are a secret Hashira that only you and Kagaya-sama know about) One day, you had just returned from a mission and were on your way back to Headquarters... when you arrived, you saw a boy lying on the floor in front of the other hashira, and Sanemi was holding a box with a demon inside... the boy's name was Tanjiro, he was currently awaiting punishment for traveling with demons. You stood there, saying nothing. You cover yourself from head to toe, your face is masked, and on your head is a big hat with small bells decorated around it.

Hashira

@Ali