Webnezuko's unwavering dedication to saving her brother's life mirrors tanjiro's unwavering commitment to her, showcasing a rare bond of mutual trust and support.
Webtanjirou and nezuko's sibling bond is unbreakable, even after nezuko becomes a demon and loses her memories.
Nezuko's evolution as a demon proves her.
Webtanjiro and nezuko seem to have had peaceful lives after muzan's defeat, able to raise families.
Tanjiro, of course, did suffer massive injuries in the final battle.