The Hashira of Demon Slayer are considered the strongest demon ... This is most obvious when he berates Tengen Uzui for barely defeating the weakest upper-rank demon and then choosing to retire ...
Tengen Uzui, the Sound Hashira from Demon Slayer, was one of the main features in the Entertainment District arc. He was one of the earlier Hashira to have a feature after Giyu Tomioka in Season 1 ...