The Nationals 2027 theme is Noir.
(Themes are optional, some categories fit some themes better than others, so no need to. And in 2024 they went with Gothic and added Vampire: The Masquerade as a separate category from World Of Darkness and I ended up running that. With the PCs as members and hangers-on at a Goth band, as the other game was about a haunted space. So I feel like I’ve paid my dues there.)
Can I do that, at least a bit?
Probably, depending on category...
Can I do Noir in Urban Fantasy? Sure. City Of Mist for one. Bloodshadows but don’t be silly.
Can I do Noir in Buffy? Yes but don’t wanna.
Angel yes, Buffy no.
Let other GMs do the heavy lifting, maybe throw in a reference of some kind. A statuette of a bird.
Or a time warp back to the 40s.
But if I was going to do a time warp to the mid 20th century in Buffy it would be to a 50s high school monster movie.
Hmm...
World Of Darkness? Sure. Period or modern noir, could absolutely do neo-noir Vampire.
Action & Adventure? Ehh. Pulp and Noir both often have 30s-40s settings but they’re not the same.