Katniss fights for the rights of the under privileged and represents them although it comes at a great cost to her and her family. She rejects a life of comfort that the Capitol could offer her and instead chooses to rebel against them because of the injustices they commit on her people and people like her. Hope this helps.
Charlies relationship with the people around him after the operation started changing.The people he thought were his friend she found out weren't really his friends.He started gaining feelings for ms.kinneon. Also no one wanted to hang out with him because he was to smart.