the Scandinavian Trio is almost a fanon the fangirls like, in most comic strips Sweden and Norway didn't show as much interests in the other two countries as the fangirls wish, even in the recent birz installment, they just agree on the nordic legends and wondered if they could retire together
While ‘The Scandinavian Trio’ IS a fanon name, I’ll give you that, historically these three countries have always had history with one another. Even outside of Hetalia it’s basically acknowledged that, in its strictest definition, ‘Scandinavian’ refers to Sweden, Norway and Denmark alone. Character contrasts between countries that are
1) neighbouring or related, e.g. (America/Canada),(Germany/Prussia)
2) historically involved e.g. (America/Russia), (Germany/Italy/Japan)
Is also a running theme in Hetalia. Why shouldn’t they apply to them as well?
While they haven’t had much to do in the strips, that’s because they’re relatively minor characters. That doesn’t mean that they’re flat characters or have little to want to do with each other, just that their relationships are not covered in detail.
As for ‘not showing as much interest in each other as the fangirls expected’, well, that’s quite relative, especially since Sweden and Norway, especially, tend to be quiet and subtle in their actions in the first place.
(You say in the most recent Birz they want to retire together—isn’t that already a sign that they’re close? )
Also, it’s not like there are few strips on their relationships either. Denmark and Norway pretty much never show up without each other and Denmark and Sweden’s relationships have been touched on before. And in character relationships can we see what characters are made of.
While I agree that ‘Scandinavian Trio’ is a fanon name, within Hetalia or not, discussing character contrasts or relationships without linking these three is kind of ridiculous, and I think I’ll keep that point when discussing Denmark, thank you.