You can delete any 15 characters from the series. However, there are some rules.

Those rules are:

1. You must delete evenly across the 5 books (so three characters for THG, three for CF, MJ, Ballad and Sunrise)
2. Deleting a character deletes them from the whole series, not just the book you chose to delete them from. For example if you delete Haymitch from SOTR, he’s deleted from the whole series.
3. You must delete 2 Capitol citizens, 2 Careers, 2 people from District 12 and 2 people from District 13.

So who do you choose?