I adore Dell, and I’m glad we got to see more of her in the second half of the book. 
Cara was such a uniquely fascinating POV character, and I enjoyed every second I spent in her head. She was simultaneously always herself and wonderfully unpredictable, and I found every scene compelling. 
And Nik Nik… I am Fascinated by him. The different versions of him. Earth 175 him and Earth Zero him… what a complicated character.