Her name is Clarissa "Clary" Jane Odair.
She is the daughter of Annie Odair and an unknown guy, but Annie doesn't remember who so she says it's Finnick Odair, as she was married to him. She is the younger brother of Finnick Jonah Odair Jr, and calls him Fin to get on his nerves.
Clary is 15.
She is from District 4.
She has Annie's brown hair and sea-green eyes.