Please help me Jill or Aslan! Who is Haymitch?

Haymitch is one of the two sole District 12 citizens to have won the Hunger Games, and the only one surviving. As such, he serves as a mentor to his district's tributes. He is a heavy drinker, which makes him seem a buffoon to most, but once Katniss and Peeta impress him, he proves himself a rather adept mentor through establishing their unified front strategy. Though Katniss professes to despise him, she realizes through the novel that they are very much alike in their craftiness and ability to suppress their emotions.