They are a lot of different characters in Catching Fire, more than the first book. The reason for this is because everything has come to another level. Katniss and Peeta became more popular than they were just a year ago after winning the 74th Hunger Games. They gained more responsibility about certain stuff and they met more new people.
I'm only going to talk about a couple of characters who I think has a huge impact on the book.
First of all there is Katniss Everdeen. This trilogy is basically based on her life, the author keeps her life in focus most of the time. She is the main character in the book. The book doesn't give her specific age, but she is around 17-18 years old. She is a girl who is really good at hunting, it was something she learned from her dead who passed away when she was young.
The second character who has a huge impact on the book is Peeta Mellark. He is the boy from the same district as Katniss and he is also the boy who won the Hunger Games together with her. He is the son of a baker and he is known to be very strong. The reason behind his strength is all the heavy flour bags his dad made him carry.
Haymitch, mostly known for being both Katniss and Peeta's mentor during the Hunger Games. He is the only living victor from District 12 who survived the second Quarter Quell before Katniss and Peeta won the 74th Hunger Games. Haymitch won the 50th Hunger Games. He is known for always being drunk. He might seem like someone who doesn't take anything seriously, but he is actually a really clever man.
President Snow, the president of Panem is also an important character in the book. Even though being the President of Panem, he is a man who is really evil. After Haymitch won the 50th Hunger Games, Snow murdered Haymitch's mom, little brother and girlfriend in revenge of making the Capitol look foolish because of a stunt he made. He also wants to take his revenge on Katniss and Peeta for pretending to be together in order to win the Hunger Games together.
