Bonnie and Twill
Bonnie and Twill, two runaways from District 8, serve as messengers. They come to Katniss at a pivotal moment in Catching Fire to both ask for help and provide illumination. They tell Katniss that District 8 has rebelled and clue her in to the possible existence of District 13. They also hint, although Katniss refuses to believe it, that Katniss has a large part to play in the rebellion. By using her mockingjay as a symbol for the rebel movement, Bonnie and Twill reinforce its meaning as a symbol throughout the book.