Anyone who picked Serafina must have not read the last book. Seraphina is lovely, and was always good while Mrs Coulter wasn't, but I feel like this makes Serafina more one dimensional than Mrs Coulter. She is just good and nothing else. Mrs Coulter is a more complex character- she has done terrible things, but she is not purely bad. Her final sacrifice for Lyra demonstrates that she still has the capacity to love, and makes her an intriguing and thought provoking character- my favourite character in the series.

I adore both but I had to pick Serafina because she was always my favorite as a child. So like 90% nostalgia.
But also I actually haven't read the last book yet; I lost it and just recently found it in my basement. But like, I always read these books in the wintertime so I have to wait to read it because...idk I gotta.