Well, in the official Marvel universe, there's no indication that the Avengers sit around watching Thor fanfic. Fanfic is more of a thing for fans in our world, not something the characters themselves would engage with in the main storylines.
One possible scenario in a fanfic could be that Thor gets injured during a battle with a powerful new enemy in the Avengers. Maybe he's facing an enemy with some sort of dark magic that can penetrate his Asgardian defenses. His fellow Avengers then have to figure out how to help him recover while still fending off the threat.
One idea could be that the Avengers find themselves magically transported to the wizarding world. Thor, with his Asgardian magic, might have an interesting interaction with the Hogwarts professors. Maybe they team up to fight a new, combined threat that is both magical and technological.
You can try fanfiction.net. It has a vast collection of fanfics related to various fandoms including Thor, the Avengers, and Harry Potter. There are filters to help you narrow down your search based on genre, rating, and length.
Well, perhaps Thor is injured while on a solo mission for the Avengers. He might be exploring an ancient ruin in search of a powerful weapon to help the team, but there are hidden traps. One such trap injures him severely. His injury could then be a catalyst for the other Avengers to learn more about the place where he got hurt and also about the weapon he was after.
It would be quite a strange situation. Maybe they'd be amused or confused. For instance, if they read some out - of - character fanfic, they might be really puzzled. Like if Thor was depicted as a coward in the fanfic, his fellow Avengers might have a good laugh or be a bit shocked.
It could be a prank gone wrong. Maybe Loki or another mischievous character played a trick on Thor that involved some sort of potion or spell that made him vomit. This would add an element of humor and sibling rivalry to the fanfic.
One popular 'Avengers Thor and Loki fanfic' story could be about their childhood adventures on Asgard. It might explore how their relationship developed from a young age, with Thor being the more outgoing and Loki the more mischievous one. Another could be a story where they have to team up against a new, powerful enemy in the Marvel universe that neither can face alone. There are also fanfics that focus on their reconciliation after a big fight, delving into their complex emotions towards each other.
Harry could fit in by using his magic for reconnaissance. His invisibility cloak would be great for spying on enemies unnoticed. The Avengers could use this to their advantage when planning attacks.
One great Thor and Avengers fanfiction is 'The Reunion'. It focuses on Thor's return to the Avengers after being away for a while. The story does a great job of showing his relationships with the other members, especially how he reconnects with Tony Stark after some previous tensions. It has some exciting battle scenes as well.