So, you know how Tanjiro usually feels empathy for the demons right after he kills them, while they're withering away, well; i would love it, if while muzan's head starts to crumble to dust, while Muzan starts feeling regret and what not, Tanjiro litterally just takes a long pee on his face. I would love it! Just showing how after you do so much wrong no one will have a slither of empathy for u anymore. And, like; the dude slaughtered his entire fam, its the least tanjiro could do. Torture would be better but i feel like thats impossible