One possible plotline could be Yelena initially being distrustful of the Avengers. Maybe she has been taught to view them as enemies, but as she gets to know them, she realizes they have similar goals. For example, she might find common ground with Natasha's former teammates in their fight against evil.
Another plotline could be that Yelena is brought in by SHIELD to work with the Avengers on a specific threat. She is hesitant at first, but as she witnesses their powers and teamwork, she starts to respect them. And along the way, she shares her unique combat skills and knowledge, which helps the Avengers in their battles.
Thor could also be in the mix. His god - like powers and different cultural background compared to Yelena would create an interesting dynamic. Maybe Yelena is initially in awe of his abilities or she challenges him in some way, leading to an engaging interaction.
Well, Steve Rogers might be a bit confused at first. He's from a different era and fanfiction is a very modern concept. But he'd probably be polite about it and say something like 'It's interesting to see how fans imagine different scenarios with Yelena.' Tony Stark, on the other hand, would likely be more intrigued. He might chuckle and say 'This is some creative stuff. I wonder what else they come up with about Yelena.' And Thor would probably just be like 'This is a strange Midgardian thing, but if it makes people happy, then so be it.'
One interesting plotline could be a civilian who is caught in the middle of a battle and is saved by the Avengers in a very unexpected way, like being teleported to safety by Doctor Strange at the last second.
One interesting plotline could be Wolverine having to team up with the Avengers to stop a powerful mutant - created virus that threatens to wipe out both mutants and non - mutants alike. He brings his unique combat skills and healing factor to the table, while the Avengers contribute their various superpowers and high - tech resources.
One interesting plotline could be the return of a long - lost Avenger who has been in hiding or captivity. For example, they might come back with new powers or a different perspective, causing a shift in the team dynamics.
Another plotline might involve Loki getting caught in a time - loop within an Avengers - related adventure. He keeps reliving the same day, and each time he has to interact with the Avengers in different ways to try and break the loop. This could lead to some really comical and also tense situations as he tries to figure out what's going on while the Avengers are getting increasingly suspicious of his behavior.
Tony could use his technology to analyze the popularity trends in Yelena fanfiction. He might say 'I can see which scenarios are the most popular in these fanfics about Yelena.' Natasha might take some of the positive portrayals in the fanfiction as a compliment to her sister. She could say 'This shows that Yelena is making an impact.' Thor might not fully understand but he could share the fanfiction stories in Asgard as a strange but interesting Midgardian thing.
Maybe an Avenger grows to a giant size and has to fight off an equally large enemy. This could involve them using their newfound size to their advantage, like picking up cars and using them as weapons, but also having to be careful not to cause too much destruction in the city.
Perhaps a plotline where the Avengers from different universes have different moral compasses. Some might be more ruthless in their methods of dealing with the multiverse collision. This could lead to internal conflicts within the newly - formed multiverse Avengers team. They would have to figure out how to work together despite their differences while also trying to save all the universes involved.
One interesting plotline could be the reader having a special power that the Avengers initially don't understand. For example, the reader might be able to control time in small bursts. The Avengers, being protective, try to help the reader master this power without it getting out of control. Another plotline could be the reader coming from a difficult background, like being an orphan in a war - torn area. The Avengers adopt the reader and show them a new life filled with hope and family. It could also be that the reader has some sort of connection to an enemy the Avengers are facing, and they have to figure out how to deal with that while still protecting the reader.