Perhaps a body swap between a human and a magical creature in a lemon fanfic. The human has to deal with the strange powers and instincts of the creature's body, while the creature in the human body discovers the joys and sorrows of human emotions and relationships.
A possible plot is that two rivals end up in a body swap situation. They initially struggle to adjust but gradually learn about each other's insecurities and secrets, which changes their relationship for the better. It could be in a high - school setting where they have different social statuses.
One idea could be Finn and Jake swapping bodies. Finn in Jake's body might struggle with Jake's more laid - back and sometimes lazy attitude towards things like guarding the Tree Fort. He could be shocked at how comfortable Jake is just lying around. Another plot could involve Princess Bubblegum and Marceline swapping. Princess Bubblegum, in Marceline's body, has to deal with Marceline's vampire instincts like craving blood (in a non - too - gory way, of course). This could lead to some comical situations as she tries to resist her new urges while Marceline, in Princess Bubblegum's body, has to handle the responsibilities of ruling the Candy Kingdom and might be a bit too carefree for the Candy People's liking.
A possible plot is that the body swap happens on a special day. The boy - turned - girl has to go on a date that the girl had planned. He tries to act as the girl but makes some funny mistakes. The girl - turned - boy has to participate in a sports event the boy was supposed to be in. They both start to see the world from a different perspective and learn to appreciate what the other gender goes through.
An 'animal body swap fanfic' might include a story about a snake and a mouse swapping bodies. The snake in the mouse's body would be terrified of being so small and vulnerable, while the mouse in the snake's body would have to figure out how to slither and use its new senses. Also, a fish and a turtle could swap. The fish in the turtle's body would be confused by having a shell and being able to move on land, and the turtle in the fish's body would have to deal with swimming in a whole new way and living in a different aquatic environment.
A great plot idea is the character learning about the other gender's emotional world. The boy in the girl's body might realize that girls often suppress their feelings due to social norms. He could then try to break those norms and express emotions more freely. Or perhaps there's a mystery element. The body swap could be part of a larger plan by some unknown force, and the character has to figure out why it happened and how to reverse it while dealing with the challenges of living as the opposite gender.
A body swap between Naruto and Hinata could be interesting. Naruto, in Hinata's body, might be a bit clumsy at first with her more reserved and gentle mannerisms. Hinata, in Naruto's body, could surprise everyone with newfound confidence. This would show a different side of their relationship and how they view each other.
A plot could involve that during a chaotic encounter in a mysterious forest, Ash and Jessie's bodies are swapped. At first, they both struggle to adapt. Ash, in Jessie's body, has to deal with her two bumbling Team Rocket partners. He tries to keep them from causing too much trouble while also trying to figure out how to get back to his own body. Jessie, in Ash's body, is confused by his Pokémon's training routines. She decides to use her own unorthodox methods which the Pokémon find strange at first, but eventually, they all start to work together in a new and interesting way to deal with the situation.
One idea could be that Naruto, now in Sakura's body, tries to use his usual brash and energetic fighting style but is hindered by Sakura's lack of brute strength training in her body. He might end up using his chakra control in new and creative ways to make up for it. Another plot could involve Sakura, in Naruto's body, having to deal with Naruto's reputation and the expectations of his friends. She could use her medical knowledge to help in battles in a way Naruto never thought of before.
One idea could be two strangers who accidentally swap bodies in a magical mishap at a carnival. They then have to navigate each other's lives, jobs, and relationships while trying to find a way to swap back.
One plot idea could be the kingpin, now in a female body, struggling to maintain his power and influence in the criminal underworld. His male - centric ways of doing things might not work as well in a female form, leading to some comical and tense situations as he tries to adapt.
One interesting plot twist could be when the characters who swapped bodies start to understand each other's struggles better. For example, if Bulma swapped with a male character, she might realize the physical challenges he faces in battles.