If Loki becomes an Avenger in fanfiction, it would be a wild ride. He'd bring his complex personality to the team. His relationship with Thor would also be an interesting aspect. They could have brotherly moments within the team dynamic. Loki might also start to develop real friendships with the other Avengers, which would be a big change for him.
Loki could also show signs of fear, though he would try to hide it. Inside, he knows the power that Thanos wields. But on the outside, he would maintain a facade of bravado. His reactions would be a mix of his natural cunning and the instinct to survive in a very dangerous situation.
It might be. There are so many Avengers fanfictions out there that it's hard to say for sure. However, given Loki's popularity, it has a good chance. If the fanfiction delves deep into how Loki would interact with the other Avengers, like his banter with Thor or his strategic mind against the likes of Iron Man, it could be a hit. Also, if it shows his growth as a character within the Avengers team, it could attract a large number of readers.
Loki might react with anger. He could seek revenge against Odin, plotting ways to undermine his power or expose his wrongdoings. This reaction is common as it shows Loki's pride and his unwillingness to be a victim.
The popularity of Thor x Loki fanfiction lies in their complex relationship. They are brothers but also have a lot of conflict. Fans like to explore how they can reconcile or what makes their relationship so strained.
One possible plotline could be Loki trying to redeem himself in the eyes of the Avengers. He has a long history of causing trouble, so it would be a journey of him making amends. Another plotline could be Loki using his knowledge of the Asgardian and other realms to help the Avengers face a threat from those areas. For example, a new powerful enemy from the Nine Realms emerges and Loki's insights are crucial in the fight.
Loki's character would develop in a very interesting way as an Avenger. He would likely start off as a bit of an outcast, still having his devious tendencies. But over time, the Avengers' sense of justice and camaraderie might rub off on him. He could learn to use his trickery for good, like using his illusions to deceive enemies instead of his teammates. His relationship with Thor would also be a major factor. They might go from being at odds to a more brotherly bond within the team, which would contribute to his overall character growth.
Loki could be surprisingly empathetic. He would see a bit of himself in Peter, perhaps, as someone who has been misunderstood. So he'd try to befriend Peter and give him advice on how to handle the bullies without using violence, like using his intelligence.