She could fit in as a strategist. Since Loki was known for his cunning, she might inherit that trait and be able to come up with clever battle plans for the Avengers.
Loki's daughter in Avengers fanfiction could bring a whole new dynamic. She could befriend some of the younger Avengers like Spider - Man or Shuri. Together, they could form an unexpected team within the larger Avengers group. Her powers might be a combination of Loki's magic and something new. She could use her abilities to infiltrate enemy strongholds and gather intelligence for the Avengers. Also, she might have a moral conflict, being part Loki and part someone who wants to do good, which would add depth to the story.
Well, perhaps the Avengers initially suspect Loki's daughter of some mischief like her father. But as they get to know her, they find out she's actually trying to make amends for Loki's wrongdoings. She could have some unique powers that both intrigue and worry the Avengers.
Thor might be conflicted. He'd see his nephew/niece but also remember Loki's treachery. Iron Man would probably be sarcastic at first, making remarks about the family genes. Captain America would be more cautious and diplomatic, wanting to give her a chance but also being on guard. Black Widow would try to read her body language and motives right away.
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.
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.
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.