One idea is that Ms Marvel's pregnancy is a result of a time - travel incident. She goes back in time, meets a version of a character she has feelings for, and returns to her own time pregnant. Now she has to deal with the consequences of this unexpected pregnancy, including how it will affect her future as a superhero and the timeline itself.
One possible plot could be that Naruto and Ms Marvel are brought together by some sort of interdimensional rift. Naruto, with his ninja skills, and Ms Marvel, with her superpowers, have to team up to close the rift. They start off not understanding each other's worlds but gradually learn to work together. For example, Naruto could teach Ms Marvel about stealth and chakra, while she could show him how to use her powers in different ways.
There could be many interesting plotlines in such a fanfiction. Maybe it could start with a strange accident that leads to Ms Marvel becoming pregnant with Peter Parker's child. For example, some sort of magical or scientific experiment gone wrong. Their relationship would then be tested as they deal with the challenges of an unexpected pregnancy. They would have to face the reactions of their friends and families, like Peter's Aunt May and Ms Marvel's own family. Also, they would need to figure out how to balance their superhero duties with the impending parenthood.
One idea could be that they team up to face a new super - villain who has the power to manipulate time. As they work together, they start to understand each other's strengths and weaknesses better. This could lead to a deep friendship and mutual respect between them.
A good plot could be that Ms. Marvel accidentally gets caught in one of Iron Man's experimental time - space devices. They end up in an alternate universe where they have to rely on each other to get back home. Along the way, they learn more about each other's strengths and weaknesses and form a strong bond.
One plot could be that Ms Marvel and Rocket are accidentally transported to an alternate dimension. They have to work together to find a way back home. Along the way, they learn about each other's strengths and weaknesses. Ms Marvel's shape - shifting powers could come in handy in various situations, while Rocket's mechanical skills help them repair a broken spaceship they find in the new dimension.
The plot could involve Female Harry Potter being transported to the Ms Marvel universe. She then has to navigate this new world while also dealing with her own magical identity. She could form an alliance with Ms Marvel and together they face a common enemy. This enemy could be someone who wants to steal both magic and superpowers. Along the way, Female Harry Potter teaches Ms Marvel about the concept of magic and in return, Ms Marvel shows her how to use superpowers in a more practical way.
In a situation like this, their worlds might collide because of their different support systems. Peter has his friends like Ned and MJ, while Ms Marvel has her own group of friends and family. The pregnancy would mean that these two groups would have to interact. It could lead to some interesting cultural clashes or just general misunderstandings as they all try to figure out how to support the couple. Also, their different powers and how they use them in combat could be affected by the pregnancy. Maybe they would have to develop new strategies together to keep themselves and the baby safe.
Maybe there's a story where Iron Man and Ms. Marvel team up to face a new, powerful villain who is causing chaos across the globe. They could combine their different powers and skills - Iron Man's technological prowess and Ms. Marvel's shape - shifting and energy - projection abilities - to take down the bad guy.
A fanfiction could revolve around a spell gone wrong in the Harry Potter world that accidentally transports Ms Marvel there. She then has to navigate the wizarding world while also trying to find a way back home. Along the way, she teams up with Hermione to study the magic that brought her there and in the process, they learn from each other's worlds.
One idea could be a time - travel fanfic. Spiderman and Ms Marvel accidentally get sent back in time and have to find a way to get back to their own time while also not disrupting the past too much. They could meet younger versions of other superheroes and have some really interesting interactions.