Another great storyline could be the Doctor getting stuck in the Avengers' universe and having to team up with them on a long - term basis. During this time, he could introduce the Avengers to different alien species and cultures, which would not only expand their understanding of the universe but also help them in future battles against unknown enemies.
One interesting storyline could be the Doctor using his time - traveling abilities to visit different eras in the Avengers' timeline and help them prevent disasters that they otherwise couldn't. For example, he could go back to the events of the first Avengers movie and use his knowledge to stop Loki's plan more efficiently.
One interesting storyline could be the students at Avengers University having to compete in a series of super - powered challenges. They might have to use their unique abilities, whether it's super strength, telepathy or the ability to fly, to overcome various obstacles. This would not only test their skills but also their teamwork and strategic thinking.
There are also storylines where Spiderman's secret identity is at risk within the Avengers. Maybe a villain has found a way to infiltrate the team and is trying to expose him. This creates a lot of tension and drama as Spiderman has to protect his identity while still being part of the team.
One interesting storyline could be a new hero emerging from a small town. This hero has a unique power that the Avengers initially mistake for a threat. So, there's a lot of tension and action as the Avengers try to figure out if this person is friend or foe. Eventually, they discover the hero's good intentions and they all team up to face a greater threat like an alien invasion.
One interesting storyline could be the Avengers having to deal with threats on the homefront that are more personal and civilian - based. For example, they might have to protect a small town from a new type of villain who targets local infrastructure. Another could be the Avengers trying to integrate into normal life while still being superheroes, like Steve Rogers getting a regular job in addition to his superhero duties.
A lot of fanfiction focuses on Loki's redemption arc within the context of the Avengers. For example, Loki could be injured and the Avengers take him in instead of imprisoning him. This leads to him slowly seeing the value in their cause and starting to change his ways. He might start using his powers for good, like helping Thor understand some new magical threats, which also helps to strengthen the bond between him and the Avengers.
One interesting storyline could be She - Hulk joining the Avengers on a mission to a parallel universe. In this universe, the laws of physics are different, and they have to adapt quickly. She - Hulk's strength and legal expertise could come in handy when dealing with the new and strange situations there. Another could be a story where She - Hulk has to defend an Avenger in a court of law within the superhero world, which would be a really unique take on the superhero genre.
One interesting storyline could be Spider - Man having to use his unique abilities to solve a mystery within the Avengers' headquarters. His agility and spider - sense might lead him to discover a hidden threat that the other Avengers overlooked.
One interesting storyline could be a crossover where Agents of Shield agents have to team up with the Avengers to stop a powerful alien threat that neither group could handle alone. This would involve a lot of character interactions, like Coulson trying to give orders to Iron Man or Natasha Romanoff teaching some of the Shield agents her spy skills.
Another storyline could be the children of Thanos being raised by the Avengers. Imagine the Avengers having to take on the role of surrogate parents. They would have to teach the children about good and evil, and the children would be in a constant struggle between their inherited nature from Thanos and the new values instilled by the Avengers.
One interesting storyline could be Peter Parker using his scientific knowledge to upgrade the Avengers' technology. For example, he might create new web - based gadgets for himself that also have applications for the team. Another could be Peter's struggle to fit in with the more experienced Avengers, like trying to prove himself during a tough mission. And there could be a storyline where Peter discovers a new power and the Avengers help him master it.