Madge Undersee

Not much is known about Madge. Although she is one of the first characters you meet in The Hunger Games, much of her past is kept in secert.

Apperances
Madge first appears on the day of the Reaping, when Katniss and Gale are selling their bounty for the day. General chatter is made until Katniss mentions her expensive dress, which Madge states is for if she is picked to go to the Capitol. This understandably angers Gale, leading to a short meeting. Collins makes a point to mention Madge's Mocking-Jay pin.

The second and last time she is featured in the book is right before Katniss leaves for the Capitol, before The Games begin. She visits Katniss in her room, and asks Katniss if she will accept a token to represent Katniss in the games. Madge hands over her gold Mocking-Jay pin as a token for District 12, and Katniss agrees, somewhat amazed at this new side to the otherwise quiet Madge.

Predictions
Most people agree that Madge has some sort of part in the Rebellion, though her part in it is scattered and unconfirmed.