(spoilers for the premises of various books)
Children of Time: What if spiders were sapient?
Children of Ruin: What if octopi were sapient?
Children of Ruin (again): What if slime mould were sapient?
Children of Memory: What if raven couples were sapient?
The Final Architecture: What if moons were sapient?
Dogs of War: What if networks of sapients were sapient?
Bear Head: What if Trump were sapient?
Also Children of Memory What if a character in a story a computer made up was sapient?
Not gonna lie, I loved them all.