Ooh, I like this, let's do some more.
Primrose - obviously a Slytherin, she spent years setting up Katniss so she'd have someone volunteer in her place if she ever got picked for the reaping. Pretty sneaky. They made it even clearer in the movie when she gave Katniss the bad luck pin... definitely trying to make sure Katniss doesn't come home.
Gale - probably a Gryffindor, he's brave but kinda dumb.
Rue - definitely a Ravenclaw, she's smart and she plays to her strengths. She also managed to recruit the best ally she could have who's willing to go out and do the more dangerous stuff and won't stab her in the back. Sadly, her plan didn't quite pan out, but it was a good one.
Effie - Hufflepuff. She's all about following the rules, somehow she's loyal to both Katniss and the Capital. And she has a touch of that Ernie Macmillan pompousness.
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"Congratulations Thomas and Sylvia! But their happiness does not continue long..."