Fanfic writers often draw inspiration from the relationships between characters. Captain Marvel doesn't have as many pre - established and well - loved relationships within the superhero universe as some other characters. For example, the bromance between Thor and Hulk or the complex relationship between Batman and Joker in DC. Without these kinds of engaging relationships to build on, it might be less appealing for writers to include her in their fanfics.
It could be due to the lack of understanding of Captain Marvel's character. Her backstory is quite complex and different from some traditional superheroes. If a writer doesn't fully grasp it, they may choose not to include her in their fanfic. Also, the way she was introduced in the MCU might not have resonated as much with some fans as other characters, leading to less fanfic about her.
One reason could be to create a new and exciting dynamic. It adds a different layer to Peter's character and backstory.
One possible reason could be a sense of failure. Maybe in the fanfic, Captain Marvel fails to protect someone important in the Young Justice universe, like a young hero in training. This could lead to feelings of guilt and ultimately make him cry.
One possible plotline could be that Captain Marvel has to race against time to stop a powerful weapon from detonating. Her speed would be crucial in reaching the weapon's location before it's too late. Another could be that she uses her speed to outrun and outwit an enemy who has some sort of time - based powers.
A different plot could be set in a post - Endgame world. Valkyrie is ruling Asgard and Captain Marvel is still out in space protecting galaxies. One day, a strange energy signal draws Captain Marvel to Asgard. Valkyrie is initially cautious but soon realizes they can work together to figure out the source of the signal. As they work together, they discover new aspects of each other and their relationship blossoms against the backdrop of a rebuilding Asgard and a changing universe.
One possible reason could be mind control. Maybe an enemy has the ability to control Captain America's mind and make him turn on Spiderman. Another reason might be a misunderstanding. For example, if Spiderman was framed for a crime he didn't commit and Captain America believed the false evidence.
She could meet a very smart science teacher who is intrigued by her powers and wants to study them scientifically.
Well, it's hard to say who the 'best' is as it depends on personal taste. But some popular authors in the fanfic community often include those who have a deep understanding of the characters. For example, 'MarvelFan45' has written some really engaging stories that explore the relationship between Captain Marvel and Captain America in different scenarios. Their writing style is very descriptive, making you feel like you're right there with the characters.
Maybe they left because of some political issues in the village. The return could be due to a change in the village's leadership or attitude. Suppose the village elders once had a problem with Naruto's father or some family secrets. So they made the family leave. But later, a new understanding or new leadership emerges, and they are welcomed back.
One common theme is self - discovery. Captain Marvel is often on a journey to understand more about her powers and her place in the universe. For example, in many fanfics she might go to a new planet and learn something new about herself through the experiences there.