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.
Some fanfiction explores a romantic relationship between Loki and an Avenger, say Black Widow. It could start with Loki being intrigued by her skills and her ability to deceive just like him. Their relationship could be a complex dance of mistrust, but gradually turn into something more. They might have to hide it from the other Avengers at first, and as they grow closer, they also start to influence each other's views on heroism and villainy.
Another plotline might involve Loki getting caught in a time - loop within an Avengers - related adventure. He keeps reliving the same day, and each time he has to interact with the Avengers in different ways to try and break the loop. This could lead to some really comical and also tense situations as he tries to figure out what's going on while the Avengers are getting increasingly suspicious of his behavior.
One interesting Loki and Avengers fanfiction could be where Loki is forced to team up with the Avengers against a greater threat. Maybe an ancient evil that even Loki realizes is too dangerous to face alone. He grudgingly works with them, and along the way, there are lots of humorous exchanges as the Avengers don't trust him at first.
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.
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.
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.
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.
There could be a fanfiction where the Avengers are forced to watch Loki's fan - created adventures in an alternate universe. In this, Loki might be a hero instead of a villain, and the Avengers have to come to terms with this new version of him. They may start to question their own perceptions of good and evil.
One interesting Young Avengers Loki fanfiction could be where Loki has to mentor one of the Young Avengers. He might use his trickster ways to teach them about the complexity of magic and the importance of out - thinking opponents. For example, he could help Wiccan control his powerful magic by showing him some of the more unorthodox methods he learned in Asgard.
One interesting story could be about Thor and Loki having to team up against a new, powerful enemy that neither of them can face alone. This forces them to put aside their differences and use their combined powers and wits to save Asgard.