Loki's teenage years in Avengers fanfiction could be a time of great turmoil. He might have been struggling with feelings of inadequacy compared to Thor. It could be shown that he was constantly trying to prove himself.
In many Thor Loki Avengers fanfictions, Loki's character development often starts from a place of being the villain. He then gradually realizes the value of his relationships, especially with Thor. For example, in some stories, after seeing the loyalty of the Avengers to each other, he begins to question his own actions. He might start to show remorse for his past deeds like the attack on New York.
In many such fanfics, the Avengers might find Loki through various means. Sometimes it could be intelligence they gather about the location where he is being tortured. For example, they might intercept a message from Loki's captors or notice some strange energy signatures that lead them to the place.
Thor would be a likely candidate. Since he is Loki's brother, he already has a connection with him. Thor might be the one to convince the other Avengers to give Loki a chance and be the first to reach out and try to befriend him in this new situation.
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.
The idea of the Avengers meeting Loki's wife in fanfiction is exciting. It could start with a tense encounter. The Avengers, being suspicious of Loki's motives, would be on guard around his wife as well. But if she is an intelligent and diplomatic character, she could break the ice. She might share stories about Loki's past that the Avengers didn't know, like how he was once a hero in his own realm before being corrupted. This could humanize Loki in the eyes of the Avengers and lead to a new alliance or at least a truce between them.
Maybe the Avengers are trying to prevent a powerful artifact from being misused. Loki, who has a history with artifacts, offers his assistance. He might do this to gain some sort of favor from the Avengers or because he realizes the consequences of the artifact falling into the wrong hands. In the fanfiction, he could use his trickery to steal the artifact back from the villains before they can use it.
In this fanfic, Loki's character can be developed by giving him a backstory related to his role as an agent. Maybe he was forced into this role by some threat to Asgard. This would add depth to his character. Also, his interactions with the different Avengers, like Iron Man's sarcasm rubbing off on him, can change his personality over time. He could go from being a self - centered trickster to someone who cares about the team's well - being.
In this fanfiction scenario, their reactions could vary greatly. Natasha Romanoff would likely be sizing up the situation immediately, trying to figure out how this new knowledge can be used to their advantage. Clint Barton might be a bit more hesitant as he's had his own experiences with Loki's mind - games. And Bruce Banner would be worried about the potential danger Loki's true form poses, especially if it has some kind of power that could set off the Hulk.