Well, perhaps in the fanfiction, Canada turns into a baby due to some magical mishap. The nations have to search for a way to turn him back. Meanwhile, baby Canada is just exploring the world around him innocently. He might crawl over to England's tea set and accidentally break a cup, leading to England's typical over - reaction.
Well, it could be a story where Canada turns into a girl due to some magical or mysterious event. As a girl, she discovers new aspects of her personality. She might become more assertive or more in touch with her emotions. And in terms of her relationships with the other Hetalia characters, she could form new friendships or rivalries. For instance, she might have a rivalry with France who is always a bit of a flirt and now sees her as a new target for his charm.
A great plotline could be England turning into a girl and then trying to prove that she is still as capable as before. She could participate in a series of challenges or competitions among the nations, like a cooking competition. Since she has a long history of certain culinary traditions, she wants to show that her gender change doesn't affect her skills. Meanwhile, her relationships with her old rivals like Spain could also take on a new dimension. They might be more hesitant to be as aggressive in their rivalries as they were before.
One possible plotline could be Canada finally getting noticed during an international event. For example, at a G8 summit, he presents an amazing plan for environmental conservation that catches everyone's attention. His usually overlooked ideas suddenly become the center of discussion, and countries like America are surprised that Canada has been hiding such great thoughts.
One possible plotline could be that it's a surprise pregnancy. Belarus might initially struggle with how to handle it, especially considering her role in the Hetalia world. She could be worried about how other nations will react, and there could be a lot of internal conflict as she decides whether to keep the baby or not.
A possible plot is that Canada, now human, decides to go on a journey across his own land to see how much it has changed and how different it is from his memories as a nation. Along the way, he meets various people who unknowingly are descendants of those who were part of Canada's history. He could also encounter challenges like trying to prove his identity to those who are skeptical of his claims of being the nation Canada in human form. He might use his unique knowledge of the land and its past to overcome these difficulties.
Another plotline could be that the President invites Hetalia America to the White House to discuss issues related to youth and pop culture. Since America in Hetalia represents a young and vibrant nation, he could give insights on how to reach out to the younger generation. This could involve things like promoting new technologies or cultural exchanges that can strengthen the country's image both at home and abroad.
One possible plotline could be that Naruto is hit by a strange jutsu that causes him to transform into a full - grown man overnight. He then has to deal with the physical and mental changes while still trying to protect the village. His friends might be initially shocked but then support him as he figures out how to reverse the transformation.
One possible plotline could be that Sonic gets bitten by a vampire during one of his adventures in a spooky zone. He then starts to notice changes in himself, like a craving for blood and enhanced speed at night. His friends initially don't realize what's wrong and think he's just acting strange. As he turns more vampiric, he has to struggle with his new nature and not harm his friends.
One possible plotline could be that Zuko turns into a dragon to gain a new perspective on his firebending. As a dragon, he might discover ancient firebending techniques that were long forgotten. This could lead him to return to his human form with enhanced skills and a new understanding of his power. He could then use this knowledge to help his friends and bring peace to the Fire Nation.
One possible plotline could be that Trunks, after turning into a girl, has to adapt to a whole new set of social expectations. For example, he might struggle with how others now perceive and interact with him. Maybe he was used to being seen as a strong male fighter, but as a girl, people might treat him more delicately at first. Another aspect could be his relationships. His friends might be a bit shocked at first but then come to accept him. And he could also have new romantic interests or challenges in that area, as his new form might attract different types of people.