An Avox would be cute but they'd need to have their tongue or voice box put back in if that was even possible and then again that sounds like a lot of trouble and unlikely to happen. It sounds like you're leaning toward Peeta and a male OC/NPC from the sounds of it. Gosh, Katniss...that could explain their BIG lack of chemistry when when they were faking it. Hmm...

And yeah reconstruction is gonna be a big ordeal and we have NO idea how to interegrate people together so they don't wanna kill one another...yeesh.