Katniss and Peeta Mellark's daughter

The girl is Katniss Everdeen and Peeta Mellark's daughter. She has a younger brother, who is referred to as "the boy". Their first names are unknown and not mentioned by the author. She is described to have long dark hair, like Katniss, and blue eyes, like Peeta. According to Katniss The girl has learned about the games in school and has an idea that her parents played an important role in them.

Biography
In Catching Fire, Peeta made up Katniss's pregnancy to try to protect her from the games. Katniss said she'd miscarried, due to the eletrict shock in the Arena. However, 15 years after the events of Mockingjay, about at age 32, Katniss became pregnant for real. Katniss describes terrible fear at the feeling of her daughter moving inside her during her pregnancy. The only medicine to heal this fear was finally holding her baby in her arms. At first, Katniss did not want children at all, but Peeta pined for them and she gave in. It is shown in the epilogue that Katniss truly loves her children, and loves that they can live without the Games. However, she is remorseful, knowing that someday she will need to tell her children about their parents' roles in the Games and the rebellion.