I have opinions on what the cast smells like at any given time. This only came about when I was reminiscing about nostalgic things I smelled.
Brothers + Side Characters
a weird musty smell that is actually pretty pleasant. Sorta like a coat closet at your grandparents that just smells old but not bad.
Ink. I firmly believe Lucifer spills in on himself all the time and that's the real reason he wears so much black.
he sometimes smells like dirt and fresh flowers but only around dinner time when he doesn't have much work because he just came in from checking on his plants.
Mammon sometimes smells burnt or smokey like he just set himself on fire. He is the fastest demon in the Devildom so maybe his clothes caught on fire a few times before.
He does smell like metals because I believe he has a hoard of dead currencies that he keeps to play with.
General car smells. Not necessarily new car smell since he sometimes smells like oil or gasoline because he takes super good care of his and his brother's vehicles.
Leviathan would smell like beach or water. He visits Lotan regularly with his switch and that's the only reason he leaves the house regularly.
Leviathan refuses to be one of the stinky people at cons so he carries a basic deodorant on him at all times and smells very strongly of it whenever he leaves the house or is in the general public.
Leviathan does have a flower perfume that Asmo got him but he diluted it to lessen the chemical smell.
Satan smells like new books. It upsets him because he has become blind to the smell and can no longer snort books for that fresh page smell.
He also smells like fresh air in the early morning when everything is still wet. Sometimes it's just a wet stone smell.
If Asmo didn't use perfume he'd smell sorta almondy, like cyanide. It's a nice smell but he doesn't like the idea of smelling like poison all the time.
Most of Asmo's perfumes are citrusy. One perfume that he loves can only be described as a rainbow-smell, it was from Solomon so that may have something to do with it.
Asmo used to wear stuff that smelled like food because he is a snac but was worried about Beel.
Beel smells like ketchup, even when he hasn't eating anything with ketchup on it.
Beel often smells like concrete and wood because he goes out to help repair damages his siblings may have caused or just help construction sites in general since he can carry heavy things.
Belphe generally smells like lavender and rosemary. Smelling rosemary can help memory and lavender helps with sleep so it fits the sleepy by.
He also smells like clean blankets because he'll nap in the laundry basket, hiding under the blankets so Lucifer doesn't make him get out.
Solomon smells like crayons because he eats them. It's not like he'll die and he likes how it horrifies the angels and Barbatos.
Pencil sharpenings. He has so many tiny pencils that were sharpened to their limits with how much he writes and draws his notes.
Simeon has the nostalgic kindergarten smell of crayons and markers. It's very comforting.
He also smells like old books and ink since he uses a typewriter.
Barbatos doesn't have a smell when he's working, it sometimes feels like he doesn't exist at all when he is working.
When Barbatos isn't working it's absolutely a royal milk tea smell. And sugar.
Diavolo has a smell that can only be described as "The Devildom". It can't be pinpointed with exact things since it feels like the entire Devildom. It is likely because he is the ruler and he has been shown to be able to control every breathing aspect of the realm (He made an artificial sun for his beach, I'm sure he can warp the Devildom's existence)
Dia also smells like smoke, that's the only thing someone can describe exactly. It is specifically cigarettes smoke because he sometimes hangs outside his father's old room which reeks of it.
Today's DnD session ended early on the accounts of "WHAT THE FUCK MAN. NOT IN FRONT OF MY MINIS" "Satan needs a new cup" and "No Solomon, you can't have Asmo naked in the background"