Was rewatching Demon Slayer and the way Tanjiro's literally smelling demons got me thinking. If demons have heightened senses which includes smell what do they smell off the other demons to distinguish each other?
Tanjiro has commented that Muzan smells heavily of death so he probably has a heavy copper smell.
Akaza I think would smell like freshly fallen snow. Personally because his entire moveset is based off snowflakes, maybe slight sweat from his physical fighting style.
Douma smells heavily of sake from the sake baths he enjoys with an underlying scent of incense from his temple.
Kokushibo was the hardest one to think of an answer too, but for some reason I think he'd smell of sword polish and maybe incense or pine needles from meditation sessions somewhere secluded and peaceful.
Gyutaro and Daki both smell similar. Makeup and like a gallon of perfumes mixed together was dumped on them because of how much time they spend in the E District. Only difference is that Gyutaro has an earthy scent mixed in with him and that's the only way to tell the two apart.
Nakime smells of wood. Cedar or pine.
Hantengu also has an earthy scent from the amount of time he spends hiding in the dirt or behind things. His clones also have nature-like scents that varies from each clone. Sekido faintly smells of fresh rain right before or after a thunderstorm. Karaku has a grassy scent. Urogi smells of a bird, when burnt mistaken for cooked chicken a lot. Aizetsu similarly to Sekido smells of rain but also a hint of salt. Urami smells of earth like Hantengu but it's a much stronger scent. Zohakutan smells of burnt wood, especially after he uses a lightning attack.
Gyokko is an unpleasant mixture of old fish, sea salt, and pottery clay.
Kaigaku smells the most human being just newly turned but he also has the scent of sword polish on him.
Enmu has the heavy smell of smoke being around trains so much.
Kyogai has a mixture of paper, ink, and leather.
Hairou smells very strongly of gunpowder and metal.
Rui similar to Akaza smells of snow however there's a strong smell of copper mixed in with the amount of times he's shared his blood with others. His other spider family also has similar scents from being given his blood.
Ubume smells of fresh water and moss from the amount of time she spends outside around water

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