In some 'Hetalia meets Anastasia fanfiction', a possible plot is that the Hetalia nations are attending a diplomatic event in Russia. There, they hear rumors about Anastasia. France, being the romantic, becomes intrigued and decides to investigate. He then discovers a young woman who might be Anastasia and tries to bring her back into the spotlight, which causes a stir among the other Hetalia characters as they debate the implications of this discovery on international relations.
Maybe the Hetalia characters are time - travelers who end up in the Hamilton era. Italy could be amazed by the food and art of that time in America, while England might have some interesting interactions with the colonists, given their historical relationship. They could also influence the development of the musical Hamilton itself in some crazy, meta - way.
One interesting plot idea could be the characters from Hetalia encountering the creepy and often disturbing entities from Creepypasta in a haunted location. For example, Italy might stumble upon Slenderman in a dark forest. Another could be the Hetalia characters being trapped in a Creepypasta - inspired nightmare world where they have to face their worst fears, like Germany facing a horde of Jeff the Killer - like beings. And perhaps the Hetalia nations could be forced to team up with some of the less - malevolent Creepypasta characters to escape a shared threat.
Italy might be a likely candidate. He is friendly and kind - hearted. His naivete could make Anastasia feel at ease, and his love for food could be something they bond over. For example, he could introduce her to Italian cuisine, which she might find fascinating.
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 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 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 Prussia as a girl trying to break into the typically male - dominated military world in the Hetalia universe. She could face challenges and prejudices but also prove herself to be just as capable as the male characters.
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 idea could be to explore what would happen if Anastasia had a secret talent for painting. In the fanfic, she could use this talent to create portraits of the people she meets during her journey, adding a new dimension to her character. Another plot could involve a love triangle between Anastasia, Dmitry, and a new character who enters their lives, perhaps a nobleman from a neighboring kingdom. It would create a lot of drama and tension. Also, a plot where Anastasia discovers a long - lost family heirloom that has special powers or significance could be really engaging.
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.