President Alma Coin

"I told you we should have rescued the boy first."

- President Alma Coin on Peeta.

President Alma Coin is the hidden main antagonist in Mockingjay, the third The Hunger Games book. She is the President of District 13 and the leader of the rebellion against the Capitol. After Snow's defeat, Alma Coin became the true main antagonist of the Hunger Games Trilogy.

She is portrayed by Julianne Moore, who also played Margaret White in the 2013 remake of Carrie.

Biography
During the 75th Hunger Games, President Coin starts the second rebellion against the Capitol to take control over Panem. As she needs Katniss Everdeen for her unique position as a symbol of rebellion to the districts, she rescues her, Finnick Odair and Beetee from the arena and hide them in District 13. It lead the Capitol to bomb Katniss' District 12, but Coin obviously doesn't care about that much.

However, Coin soon discovers it is hard to cooperate with Katniss who dislikes her for her selfishness and ruthlessness. Coin often regrets openly she couldn't save the more charismatic Peeta from the arena instead of Katniss.

Before the attack on the Capitol, Coin realizes Katniss could menace her position of president, as people still love the girl more than her. To destroy her rival's psyche completely, she decides to murder someone the girl really loves. In the Capitol, Coin uses the Capitol hovercraft which launches bombs placed in supply packages on some children. When they blow up, Rebel Medics, alongside with Katniss' sister Prim, run there to help injured kids. However, once they reach them, other bombs blow up, killing all children, Medics and Prim. After that, the Capitol gives up.

Katniss, who saw her sister die, is now heavily dazed, and Coin becomes the President of Panem. She decides to organize the last Hunger Games which children of the Capitol would fight to death in. However, she never gets a chance to. Thanks to Snow, Katniss realizes the President's goal: she planned the rebellion in the districts by having them fight it out, leaving District 13 untouched; once the districts were hers, the Capitol could easily be nabbed. This leads Katniss to shoot Coin with an arrow dead, rather than Snow, who was slated to die.

Trivia

 * Although President Snow is the main antagonist in The Hunger Games trilogy, Coin serves as the main antagonist in Mockingjay because she had bigger plans than anyone else.