Webnezuko’s transformation grants her immense physical strength that she was able to harm daki by simply stomping on her limbs and dealing power blows that.
Webmost notoriously about hantengu's unique power is that he takes advantage of the traditional method of decapitation to kill a demon, as beheading hantengu's.
Decides to give up his position as hashira after the loss of his left hand and eye, though he does come back to help train demon slayers and to protect.