Just recently had the idea for an NRP set in the 60s inspired by the Godzilla movies.
Basically think of a retro sci-fi world with giant monsters and ancient aliens roaming around, right in the midst of Cold War.
Mentioning this because it slightly resembles C. The world is divided yet new threats make it neccessary to work together for survival.

C.) This is obvious why the first for me.

B.) I like the concept but wonder how you manage to turn this into an NRP.

A.) Council games are not my cup of tea. If it's fantasy I prefer Malazan over Game of Thrones, if you get what I mean.