Hela isn't Loki's daughter in the comic universe. Their characters have separate origins and roles. There's no established connection of that nature between them.
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.
In an 'Avengers meet Hela' fanfiction, there could be an epic battle. The Avengers, with their diverse powers, would face off against Hela, the powerful Asgardian goddess. Iron Man might use his high - tech suits to try and fend off her attacks, while Thor could be conflicted, as she is related to him. Captain America would lead the team with his strategic mind, and they might eventually find a way to either defeat Hela or come to some sort of truce.
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.
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.
Thor would likely have a very complex interaction. Since Hela is his sister, there would be a mix of family drama and conflict. The other Avengers might be initially distrustful of Hela. Iron Man could crack sarcastic remarks at her. Captain America would try to keep the peace and assess the situation. Hela, on her part, might look down on the Avengers at first, seeing them as lesser beings compared to her Asgardian power.
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.
Well, in such a fanfiction, there could be a lot of conflict. Maybe Loki's son has some sort of hidden power that the Avengers initially fear. But then they might realize he's not as bad as they thought and try to help him control his powers. Or perhaps Loki's son is on a mission to prove himself and the Avengers see him as a threat at first.
Loki's character development can also involve him learning about the value of teamwork and friendship. As he interacts with the Avengers more, he starts to see the benefits of working together rather than against them. He might share his knowledge of magic and Asgardian lore with the team, which in turn helps them in their battles. This exchange also helps him grow as a character and become more integrated into the group.
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.