One benefit could be that it offers a new perspective on the Marvel universe. Since MHA (My Hero Academia) has its own unique set of characters and concepts, seeing how a fanfiction combines it with Marvel can be really interesting. It might inspire new ideas for crossovers in other works as well.
Definitely not. Fanfictions are often the result of fans' wild imaginations. When it comes to MHA watches Marvel fanfiction, the writer is probably trying to create something fresh and different. They might take a minor Marvel character and give them a major role, or change the relationships between characters completely. So, it's very unlikely to follow the original Marvel plot.
Imagine Loki showing up during one of the Johnsons' family meetings. Chaos would surely ensue. The Johnsons would be on high alert, not knowing what Loki is up to. Loki, on the other hand, would be sizing them up, looking for weaknesses. As the story progresses, they could form an uneasy alliance. The Johnsons could help Loki find a way home, but only if Loki helps them solve a problem in their own world. This would create a complex web of relationships and plotlines in the fanfiction.
In a 'Captain Marvel Meet the Avengers' fanfic, there could be an epic showdown against a powerful villain. Captain Marvel's immense power combined with the Avengers' diverse skills would make for an amazing battle. For example, she could team up with Thor to take on an enemy that has the ability to control electricity. Their combined strength of her photon blasts and his lightning strikes would be a sight to behold.
There could also be a story where Captain Marvel has to prove herself to the Avengers. She might be seen as an outsider initially. So she has to show her worth through her actions. She could single - handedly take on a group of powerful villains to gain the Avengers' respect, and then they all work together towards a common goal.
Well, I think some of the MHA characters would be really confused. For example, Midoriya might be a bit bewildered by the different superpower concepts in the MCU fanfiction. He's used to his own world's Quirks, and suddenly seeing things like the Infinity Stones and Asgardian magic would be a lot to take in.
In this fanfic, the main antagonist could be a scientist who has been corrupted by his own experiments. He creates some sort of energy - based monsters that are immune to normal attacks. Captain Marvel and the Avengers have to figure out how to stop these creatures and the mad scientist behind them.
One possible plot could be that the Avengers are facing an extremely powerful new enemy that they can't seem to defeat. Captain Marvel arrives on Earth just in time. At first, there are some misunderstandings and clashes of egos among the Avengers and Captain Marvel. But as they start to work together, they realize each other's strengths. Captain Marvel's raw power combined with the Avengers' teamwork strategies slowly turn the tide of the battle. Eventually, they defeat the enemy and Captain Marvel decides to stay on Earth for a while to help the Avengers train for future threats.
Well, Shazam has the wisdom of Solomon, which could help him strategize against some of the more impulsive Marvel heroes like the Hulk. His super strength and speed would be on par with characters like Thor or Captain America. When it comes to Marvel powers, Iron Man's technology could be used to analyze Shazam's magic, and perhaps find a way to enhance or counter it.