Minnesota Martha

Minnesota Martha is one of the main antagonists of The Hunger Games and is portrayed by Raina, Minnesota Martha is the organizer of The Hunger Games and sends Liam, Amanda, Gage, and Jacob to participate. She is first revealed in a letter read by Deputy Armada, and then as a disembodied voice from a radio. She makes her first physical appearance at the end of the film in a phone call with Keagan.

Personality
Minnesota Martha (despite her government position) is kind of quirky. You can tell that she's enjoying every second of it. One of the most notable things about Martha is her Minnesota accent, which she bears proudly.

Trivia

 * Martha's radio speech and her phone call near the end were recorded on a different day after regular recording.