Sometime ago I was wondering "Which other relationships do North have apart from his brothers?", the answer didn't come really easy, but my brain won't stop until find some countries (in hetalia more than real world) whom I can fit him in.
Belarus: once I read someone talking about the relatioship thos could have in order to food? And I like that idea, I would also like to add some relationship as a couple, but this relationship ended with both of them being really close friends. (Both fire the chaoticness to the other).
S. Korea: both likes fashion and are into textile industry, S. Korea usually share his taste in music with North (and Belarus) and sometimes dance together. They both share this feeling towards the twin brother and the difficult explanations behind.
Liechtenstein: they see each other in every meeting the Uk has with Switzerland, developing a friendly relationship since both didn't pay attention to the meetiings at all, so North was the one who introduces Lily to Belarus and S. Korea.