One idea could be a sports competition between the characters from Hetalia and Countryhumans. They could compete in various events like a grand international Olympics - style tournament. This would bring out their competitive sides as well as show their national pride. Another plot could be a diplomatic crisis where the characters from both universes have to work together to solve a global issue, like a sudden environmental catastrophe that affects all of their 'countries'.
One interesting aspect of this crossover fanfiction is the combination of different character interpretations. In both Countryhumans and Hetalia, the personification of countries allows for unique storylines. The crossover can bring out new relationships and interactions. For example, characters from both universes might engage in diplomatic negotiations or cultural exchanges in a fan - written story. This can lead to creative exploration of historical events and modern - day geopolitical relations through a fictional lens.
One idea could be to have the characters from Hetalia and Homestuck participate in an international event together. For example, a global gaming tournament where the strategic minds of the Hetalia characters and the unique abilities of the Homestuck characters collide. Another plot could involve a dimension - hopping adventure where the Hetalia countries find themselves in the Homestuck universe and have to adapt to its strange rules and customs while trying to find their way back home. Or perhaps a story where the trolls from Homestuck end up in the Hetalia world and start causing chaos among the different nations.
One idea could be that the characters from Hamilton are transported to the Hetalia world. Hamilton could use his political acumen to influence the international relations in the Hetalia universe. For example, he might try to introduce new democratic ideas among the nation - states there.
One idea could be that the countries from Hetalia are somehow transported into the Naruto world. For example, Italy could end up in Konoha and his carefree attitude might amuse or annoy the ninja there. Maybe he gets involved in a mission by accident and his unique skills from being a nation, like his knowledge of different cultures and languages, could come in handy. Another plot could involve Naruto being sent to the Hetalia world and having to deal with international relations in a very different way than he's used to in the ninja world. He might try to use his ninja way to promote peace between the nations there.
One common theme is friendship among the personified countries. Despite their differences in appearance or characteristics from the two franchises, they can form bonds in the crossover stories. Another theme is cultural exchange. Since both are about personified countries, there's a lot of room to explore how different cultures interact.
Maybe the Black Butler characters are sent to the Hetalia world. Sebastian could be intrigued by the different cultures and politics of the countries. He might use his charm and skills to manipulate some of the smaller countries for his own or Ciel's gain. Grell could go wild with excitement over all the new 'pretties' he could potentially reap in this new world filled with so many different characters. And Ciel would be constantly trying to figure out how to get back to his own world while also dealing with the strange international relations in Hetalia.
One idea could be a Quidditch tournament where the Hetalia characters represent different magical countries. For example, Italy could be on a team and use his charm to distract the opposing team. Another could be a magical artifact that gets lost in the Hetalia world and the Harry Potter characters have to go there to retrieve it. Maybe they have to deal with the political situations in the Hetalia world while searching for the artifact.
One idea could be to have Sherlock investigate a mystery related to a historical event in Hetalia. For example, he could look into the disappearance of a valuable artifact during a time of war in one of the Hetalia countries. Another idea is to have the Hetalia characters assist Sherlock in solving a case in London. Maybe Italy could provide some unexpected insights with his unique perspective. Also, a crossover could involve Sherlock being transported to the Hetalia world and having to adapt to its strange rules and cultures while still using his detective skills to solve local mysteries.
One idea could be that the Hetalia characters suddenly find themselves in the BNHA universe and have to adapt to having quirks. For example, Italy might be really confused at first but then find that his ability to make good pasta could be turned into a quirk related to food creation or manipulation. Another could be that the BNHA characters visit the Hetalia world and are shocked by the different cultures and historical settings. They could learn about different forms of power and leadership from the Hetalia characters.
France from Hetalia is known for his charm and love for art and culture. He could be a great character to focus on in a crossover. In Countryhumans, China could be an interesting counterpart. With China's long history and rich culture, there could be some really engaging exchanges about art, food, and traditions between the two characters.