I’ve been watching an anime on Netflix called Mushi-shi and it made me think of the Fae in Urban Shadows quite a bit. Now this is about as far from “urban” as you can get but I think the idea of “mushi” might be interesting to others who want to expand on the Fae.
The short version is that tiny organisms/spirits live around the physical world. They are unthinking but can have an effect, if you are carrying something they are attracted too their can drag at your ankles making you feel tired and likely to stumble. They might gather in large numbers because of an approaching storm and cause people in the area to have euphoric feelings.
The main character in the anime is a mushi-shi, someone who knows a lot about the mushi and can identify problems and often tell people how they can resolve them.
Obviously for Urban Shadows this would only be one aspect of the Fae world, but a very interesting and different one I think.