Well, perhaps in the fanfiction, future Loki has some new powers that the Avengers are both intrigued and a bit scared of. This could lead to a tense relationship at first. Then, as they start to face a common enemy, they have to learn to work together. Maybe the story could be about how future Loki's presence changes the dynamics within the Avengers. For instance, Thor might have a hard time trusting his brother again, but the rest of the Avengers see potential in Loki's knowledge of future events.
One possible plotline could be that future Loki comes with a warning about a new threat that the Avengers initially don't believe. For example, he might tell them about a powerful being from another dimension that is slowly making its way to Earth. Another plotline could involve future Loki trying to redeem himself in the eyes of the Avengers by helping them prevent a disaster that he was partly responsible for in his own timeline. He could use his knowledge of magic and trickery to outwit the new enemy.
One interesting plotline could be that future Tony brings advanced technology that completely changes the Avengers' combat strategies. For example, he might introduce new types of energy shields that are more powerful and adaptable. Another could be that future Tony has knowledge of upcoming threats that the present - day Avengers are unaware of, leading to a race against time to prepare for these new enemies. Maybe he also has some sort of personal growth or regret from his future experiences that he tries to correct in the present, which could lead to some very emotional and character - developing moments within the story.
Future Loki might interact with the Avengers in a cautious way. He knows their past opinions of him and tries to prove himself. He could start by sharing small bits of useful information. For example, he might tell Iron Man about a weakness in a new enemy's technology.
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 plotline could be Loki initially resisting the Avengers' attempts to adopt him. He might be suspicious of their motives, thinking it's a trick. But over time, as they show genuine care, he starts to open up. For example, Thor could be a key factor in getting Loki to trust the Avengers, as he vouches for their good intentions.
One interesting 'Avengers meet Loki' fanfiction could be where Loki is actually forced to team up with the Avengers against a greater threat. Maybe a new, powerful enemy emerges that Loki realizes he can't defeat alone, and he has to use his wits and the Avengers' strength. In this story, there could be a lot of humorous exchanges as the Avengers are initially very suspicious of Loki.
One interesting plotline could be where the Avengers have to rescue Tony from a powerful new enemy. They discover that this enemy has a personal vendetta against Tony and has set a trap specifically for him. The Avengers then have to use their unique skills and teamwork to break through the enemy's defenses and save Tony.
Often, there's a plotline where Loki has some inside knowledge about an enemy that the Avengers are facing. Maybe he has some past connection with the villain. So, he becomes a key source of information. There could also be a plot where Loki's presence in the Avengers causes some internal conflict within the team. Some members don't trust him, while others see his potential. This conflict and how it's resolved is a common plotline too. And sometimes, Loki might get kidnapped or held hostage by the enemy because of his new - found alliance with the Avengers, and the team has to rescue him.
One great example could be a story where the Avengers initially suspect Loki but then realize he's been wrongly judged. In this fanfiction, Loki might use his magic to help the Avengers in a battle against a common enemy, like a powerful new villain from another dimension. This shows his good side as he puts aside his past differences with the team.
One popular plotline could be Loki being the new student in high school where the Avengers are also students. Loki might initially try to cause trouble, like pranking the other students or trying to steal something important for a school event. Another plotline could involve a school competition where the Avengers and Loki are on opposing teams, and they have to learn to work together in the end. And there could also be a plot where Loki has a secret crush on one of the Avengers and tries to hide it while still being his mischievous self.
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.