Drummer seems to be a composite of Sam, Pa, and the book-Drummer. I’m a bit disappointed by that, but I understand the need to do it. It seems that they also combined the relationships that each has with Naomi, making it more meaningful for her, and emphasizing her Belter-ness.

Spin could be useful to a colony. If you build upside-down, centrifugal force = false gravity (assuming you can cope with the Coriolis effect.

Anything containing Lazarus Long (Robert Heinlein) or Drizzt Do’Urdan (RA Salvatore) as well.