Of all characters in dbh, captain Allen seems like the only one who actually has a functional family at home. I can't explain it, but he just gives off this vibe of a married man who has his shit figured out in both personal and professional ways. He seems like outside his work hours he's actually a family person, probably with kids, one or two.
Connor: Nothing. No scent. Will put on different scents manually as the situation arises.
Markus: Probably fire smoke since he keeps hanging around those barrels OR setting things on fire.
Kara: One of those old lady perfumes. You know the ones.
Alice: Child smell. You know the one.
North: Like Markus, but stronger. Lingering feminine perfume.
Josh: Like Markus, but with a lingering clean aftershave.
Simon: Like Markus, but more metallic.
Gavin: Strong aftershave. Like Axe.
Tina: Nothing, maybe deodorant if you draw too close.
Luther: He smells the best out of everyone. He just does. Whatever you think is the best smell, he smells like that. For me, that's Giorgio Armani's Acqua Di Gio.
Chris: Spray-on deodorant, but like two of them mixed together. It's not bad, but it's indistinguishable.
Ben: Whatever he just had for dinner. I feel like he's a Hawaiian pizza or pepperoni kinda guy.
Rose: Dirt and a flowery perfume.
Adam: Dirt, sweat, and literally Axe.
Amanda: Some rich-as-hell perfume. Strong.
Nines: Hello Kitty Bubblegum
Todd: The reminisce of red ice. Perhaps some sort of cigarette smoke smell mixed in.
Ralph: Hell no
Captain Allen: Second best smeller. Not Giorgio Armani's Acqua Di Gio, but a second, secret scent that beats everyone else but Luther. He smells good.
Perkins: Whatever aftershave smells of wood and more blunt scents. He doesn't wear too much.
Kamski: Pool water? But also Hello Kitty Bubblegum