We've already seen what Stalin and Hitler were like to their nation-tans, further exploration might be interesting. Maybe North Korea's bosses have him/her forcefed and filled with drugs on the assumption that it'll improve the populations' health and ignore his/her protestations that it actually works the other way round. Meanwhile, on a much milder note, South's bosses simply make it abundantly clear that they think he's annoying. Or Rome had horrible things done by his weirder emperors. Or someone treats their nation-tan like a pet or an ornament more than a person. Anything from just hurt feelings to outright physical torture is fine. Just not sexual abuse, for the purposes of this one.

Bonus: if you go the "severe physical abuse" route, nations can't disobey their bosses, so, as punishment for disobedience, the boss orders them to hurt themselves. I specifically have a mental image of Hitler ordering a recalcitrant Germany to place a gun barrel in his palm and fire it, but I'm open to whatever.