Katniss Everdeen
Katniss Everdeen was born on the 8th of May in District 12. In the story, she is 16 years old prior to the 74th Hunger Games, she is 5'7" tall.
Katniss was close to her father and spent time hunting with him in the woods, he taught her about hunting, nature and how to use a bow and arrow. Her father also taught her to swim in a pond deep in the outlying woods. When she was 11 years old, her father died in an explosion underground in the mines where he worked, leaving her to take care of her mother and sister.
In order to protect her mother and sister, she volunteered to take her sister's place in the 74th Hunger Games. She found out that the other tribute from her district was Peeta Mellark, the boy who had saved her family from starvation during her mother's depression by sneaking her some bread from his family's bakery shop.
Katniss's has a mother and sister, her only next of kin apart from her late father. As they are her only two family members, Katniss takes good care of them and treasure them a lot and that explains why she volunteered to take her sister's place in the Hunger Games instead.
The antagonist of the story have to be the people of the Capitol and the rich people from other districts. The district gave a small amount of money to Katniss' family to allow them to grieve for a month before her mother was expected to get a job. If her mother did not get a job, which she will be deemed as an unfit mother, the district will then send her mother and her sister to the community home.