I wished that Leah Clearwater and Bree Tanner had gotten better ending. They had so much potential that was wasted.
In my mind, Leah should have went off of an adventure to heal from all the trauma in her life. Instead, she is staying in a place and around people that reminds her constantly of that pain. This could be so toxic and take her to a bad place.
For Bree, I wanted her to live but not with the Cullens. I wish that she had escape and joined Fred. Those two could have ended up together as I never believed that Diego was her mate. Wouldn't you feel it instantly when they die like Victoria knew without being told or witness it.