One interesting plot could be the cultural clashes and misunderstandings between the Hetalia characters and the states. For example, a state with a very fast - paced lifestyle might find it hard to get along with a more laid - back Hetalia character at first. Another plot could be the states introducing their unique local traditions to the Hetalia crew, like a state's specific food festival.
Matthew Williams (Canada) can be quite popular. He's often portrayed as a nice and gentle character, and his interactions with the American states, especially those near the Canadian border, can be really cute. Some of the more energetic and unique states themselves can also become popular characters within the fanfiction, like New York, which has a distinct personality.
There's 'Civil War Echoes in Hetalia'. This fanfiction delves deep into the political and social aspects of the civil war within the Hetalia world. It shows how different states are affected and how they try to navigate through the chaos. The author does a great job of creating a believable and engaging story world. It's really worth reading if you're into this genre.
One interesting plot could be that Alvin and Brittany meet in a completely unexpected place like a magical forest. They start off being a bit cautious around each other, but then gradually discover they have a lot in common.
One possible plot could be that Alice has a premonition about Jasper being in danger, and she goes on a quest to find and save him. This could involve her using her special ability to track him down through different settings, like a mysterious forest or an abandoned building.
Another plot could be that the aliens have a completely different form of communication, like telepathy. A human scientist discovers this and tries to find a way to communicate with them. It leads to a series of adventures as they try to bridge the communication gap and learn about each other's technologies and ways of life.
One interesting plot could be Spyro meeting a new character who has unique powers. This new character could either be an ally or a foe, creating a whole new set of adventures for Spyro.
One common theme is loyalty. Characters have to decide which side to be loyal to during the civil war. Another is power struggle as different states vie for control. For example, in many fics, states fight over resources which represent power.
One common theme is unity. Fanfictions often show Fem America bringing the states together despite their differences. For example, in many stories, there might be a crisis that forces the states to cooperate, and Fem America is the driving force behind that unity.
A possible plot is Naruto arriving during a major battle in the Warring States period. He could use his shadow clone jutsu to turn the tide of the battle in an unexpected way. Since the concept of such a large - scale clone technique might be new to them, it would create chaos among the enemy forces. Additionally, Naruto might get involved in the politics of the clans. He could try to convince the different clans to stop fighting and form an early version of the Hidden Villages, using his experiences from his own time. He might also have to deal with the power struggles within the clans, like the Uchiha's thirst for power and how it affects the overall balance.
One interesting plot could be the marauders meeting their descendants and being shocked by how different yet similar they are. For example, seeing the next generation's use of magic in new and unexpected ways.