This was my #HeadCasting when I read Nightside:
Patera Silk - young Michael Caine
Auk - Common
Blood (the crime lord, duh) - Vincent D‘Onofrio
Also Maytera Marble - Michelle Yeoh, Maytera Mint - Andie MacDowell, Maytera Rose - Helen Mirren, and Hyacinth - Rocketeer-era Jennifer Connelly