Well, perhaps Sonic is cursed by an evil wizard to turn into a vampire. In this story, he might have to find a way to break the curse before it's too late. He could encounter other vampire characters who either try to help him or lead him astray. His transformation could also give him new abilities that he has to learn to control, such as the power of flight or the ability to hypnotize enemies, which would add an interesting twist to his usual battles.
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.
In a Sonic - turned - vampire fanfiction, it could start with Sonic exploring an ancient castle. There, he disturbs an old vampire who was in slumber. The vampire attacks him and turns him. Sonic's friends, Tails and Knuckles, start to notice his paler complexion and his avoidance of sunlight. Sonic has to deal with the fact that he can no longer eat his favorite chili dogs in the same way. He also has to face off against new vampire - related enemies that are drawn to his new vampire energy. He may even have to journey to a vampire realm to seek a cure, all while trying to keep his vampirism a secret from his friends who might fear or reject him if they knew.
One possible plotline could be that Henry Lau, after turning into a vampire, struggles to come to terms with his new identity. He might try to hide it from his friends and family at first. For example, he could be a famous musician in his human life, and now he has to find ways to continue his career without revealing his vampiric nature. He may have cravings for blood that he tries to resist, leading to internal conflicts.
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 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.
One possible plotline could be that as Captain America turns into a girl, she has to deal with the sudden change in her physical form while still having the same strong will and sense of justice. She might struggle with how others in the Avengers or the world perceive her now. Maybe she has to prove herself all over again, not just as a female version of Captain America, but also in a male - dominated superhero world.
One possible plotline could be that as Harry turns into a phoenix, he discovers new magical abilities. He might be able to fly faster and farther than any normal wizard on a broom. For example, he could use his phoenix form to quickly travel to places that are normally hard to reach, like the far corners of the Forbidden Forest. Another aspect could be that his transformation is related to some ancient prophecy. In the wizarding world, prophecies often play a big role. Maybe this transformation is the key to defeating a new dark force that is emerging. And perhaps his friends, like Hermione and Ron, have to figure out how to help him control this new form and use it for good.
One possible plotline could be that Ash, as a girl, has to face different challenges in the Pokémon world. For example, some trainers might underestimate her at first. She could also form new friendships or rivalries. Maybe she'd have a different approach to training Pokémon, focusing more on strategy and less on brute strength like she sometimes did as a boy. Another aspect could be how her Pokémon react to her new form. Some might be more protective, while others could be confused at first but then adapt.
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.
In this fanfiction, perhaps a powerful dark magic object turns Harry into a cat. As a cat, Harry's senses are heightened. He can smell danger better and hear things from far away. He might use these new abilities to uncover a plot by Voldemort's followers. For example, he overhears some Death Eaters planning to attack Hogwarts through a hidden entrance that only a cat could access. So he has to find a way to warn his friends while still in cat form and then figure out how to turn back to human to fight against them.
One possible plotline could be that Twilight Sparkle is exposed to some dark magic that gradually corrupts her and turns her into a demon. As a demon, she might struggle with her newfound dark nature while her friends try to save her. For example, they could search for a way to reverse the transformation by looking for ancient spells or artifacts.