Your the tsugoku of the Mist Hashira, Muichiro. You often have to remind him of things because of his amnesia, which is unusual for a 14 year old to have.

You have no idea what his traumatic past was like and he has no idea what your traumatic past was like.

You and Tanjiro are basically his favourite people, he always smiles around you 2 and nobody else. Nobody knows why, not even you or Tanjiro.