Mockingjay novel - Theme: there are no winners in war

Which character (s) demostrate this theme?

How?

What events demostrate this theme?

Katniss because she does always ends up making sacrifices for her mom, little sister, and peeta

Katnis everdeen, to simply put it in words, one thing happens after another and she always ends up having to make sacrifices and example of an event is when she finally has a hold on peeta but he has been drugged and attacks her