Pollux is one of the two cameramen who film the propos starring Katniss Everdeen as the Mockingjay. With their outfits for filming Katniss often comments that they look like insects.
Pollux is an Avox, so he cannot talk. His brother often acts as a translator for him. As an Avox Pollux had to work underneath the Capitol for years. This comes in handy in Mockingjay when Katniss, Peeta Mellark, Finnick Odair, Pollux and company have to venture underground to avoid Peacekeepers as they make their way to the residence of President Snow. He knows they layout, the schedule for Avoxes, as well as a lot of the trips and traps. Pollux is definitely an asset for this portion of the book.
Pollux is the one Katniss sings The Hanging Tree to. Once she finishes he is crying, and while Katniss assumes she brought up some horrible memory he tried to repress, the real reason is never stated.
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