Well, he might form alliances. For example, he could team up with someone like Magneto. They might use their powers together to take over a city or fight against a common enemy like the Avengers in that fanfic world. It would be a chaotic and interesting combination of powers and personalities.
Thanos is a likely one. Given their both having grand ambitions in the Marvel universe. In fanfiction, their meeting could be a battle of wills as they both want to be the dominant force. Loki might initially try to deceive Thanos, but Thanos is no fool and would see through Loki's tricks.
I really liked 'Avengers and the Young Trickster'. In this fanfiction, Kid Loki is brought to the Avengers' headquarters by some magical accident. His presence is a shock to everyone, especially Tony Stark who is both intrigued and cautious. The story then unfolds as they try to figure out how to send him back to his own realm while also dealing with Kid Loki's attempts to gain power within the Avengers' world. It has some great character interactions.
It could be a very tense meeting. Harry, being used to the more straightforward magic of his world, would be on guard against Fem Loki's unpredictable and often chaotic magic. He might initially see her as a threat.
One of the well - known authors is 'MidnightSun87'. Their Loki fanfictions are really popular for their in - depth character analysis. Another great author is 'AsgardianScribe'. They have a unique way of writing Loki's dialogues that really bring the character to life. And 'FrostyFanatic' is also highly regarded for creating really engaging storylines involving Loki.
The other character could be a fellow wizard or sorcerer. They might meet at a magical gathering and initially be rivals, but then realize they can work together to face a greater threat like an evil dark mage.
One great fanfiction could be 'Jaskier's Encounters'. In this, Jaskier meets different Witchers and they embark on various adventures together. It really showcases the different personalities of the Witchers and Jaskier's role in their world.
A common theme is the clash of cultures. Loki, being from Asgard, has a very different set of values and behaviors compared to the ponies in MLP. This can lead to misunderstandings and comical situations.
If Loki impersonated Thor, the real Thor would be furious when he found out. The other Avengers, like Iron Man, might initially be confused but then quickly realize something is off. Iron Man would likely use his technology to detect the impostor. Hulk might just smash first and ask questions later when he senses something wrong with 'Thor'.
The other Asgardian warriors might have mixed reactions. Some who are close to Sif might be protective and worried that Loki will hurt her. They remember all the times Loki has caused chaos in Asgard. But there could also be some who see it as a chance for a new beginning, a way to bring a different kind of harmony to Asgard. And the Asgardian commoners? They might see it as a great love story, something to gossip about and hope that it will bring some positive changes to their world.