In the "Odyssey", the shape shifter would be the mighty war goddess, Athena, for she changes her appearance throughout the tale of Odysseus. but (sadly), I have not read the hunger games (yet), so I am not entirely sure who/what you are talking about
D...............................................
Answer:
the Gummy Bear dude, from the song "Oh I'm a gummy bear, oh yes I'm a gummy Bear"