Well, surely the original Avengers like Iron Man, Captain America, Thor etc. would be main characters. Their characteristics and abilities would likely be adapted to fit the 'steel' theme in some way.
Well, it could be about the Brotherhood of Steel's high - tech weaponry and combat skills being combined with the Avengers' superpowers. Maybe they team up to fight a common enemy that is a threat to both their universes, like an extremely powerful alien race that is seeking to conquer all dimensions.
One interesting plot could be the Avengers facing a new, super - powerful villain made of an unbreakable steel - like substance. They have to figure out how to defeat it without their usual methods working.
Definitely Iron Man and a Brotherhood of Steel member who is an expert in technology. Their exchange of ideas about advanced weaponry and engineering would be fascinating.
Clint is often seen as the glue in Avengers fanfiction because he has connections to many of the characters. He's been on the team for a long time and has a unique relationship with each member. His loyalty and down - to - earth nature help hold the group together, even in tough times.
In some fanfictions, Tony might be kicked out of the Avengers because of a conflict in leadership styles. Maybe his high - tech and sometimes risky solutions don't sit well with other members who prefer more traditional or cautious approaches. For example, if a mission goes wrong due to one of his untested inventions, the team could lose faith in his decision - making abilities.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfiction on various topics, including Avengers watching Avengers Endgame. There are also some fanfiction sections on dedicated superhero forums where fans share their creative works.
Tony Stark might use his quick wit and technology. He could immediately scan Peter to make sure there's no physical danger causing the hyperventilation. Then he'd probably crack a joke to try and calm Peter down, like 'Kid, you breathe any faster and you'll fly away like a human jetpack.'
Some characters would likely be entertained. For instance, Loki might enjoy seeing the various ways fans write him as a more complex anti - hero. He'd probably find the creativity in the fanfiction quite appealing.
One great Avengers fanfiction to watch next could be 'The New Avenger'. It has an interesting plot where a new hero emerges and has to prove themselves to the established Avengers. The character development is really well - done.