The Avengers would likely have a range of reactions. Captain America would respect the Incredibles' sense of justice. And the Hulk might just be confused at first but then find it cool.
Some of the Avengers might be inspired. For instance, Black Widow could be inspired by Elastigirl's ability to adapt. Thor might see parallels between his own heroic deeds and those of Mr. Incredible. And they might all have a good laugh at some of the more comical parts of the movie while also learning about family values from the Incredibles.
If the Avengers watched The Incredibles, it could be a very interesting scenario. The Hulk might get a bit jealous seeing Mr. Incredible's strength at first. Black Widow would notice how Mrs. Incredible manages to be a great mother and a superhero at the same time. Hawkeye would be interested in the archery skills of any character in the movie who might use a bow. And they all could learn something about teamwork from the family's dynamic in the movie.
They could be entertained. Characters like Frozone might find it really interesting to see how fans envision their world and relationships. He might even laugh at some of the more comical interpretations in the fanfic. Fanfics can often bring out new aspects of their personalities in a fun and unexpected way.
I really like the fanfiction 'Incredible Avengers Alliance'. It focuses on the relationships between the characters. For example, it shows how Mr. Incredible and Captain America bond over their leadership qualities. It also has some amazing action scenes where the combined forces of both groups take on a huge threat.
One common theme is teamwork. Since both the Avengers and the Incredibles are about groups of heroes, fanfics often explore how they work together. Another theme is power management. The different powers of the characters from both universes are often compared and contrasted.
Mr. Incredible and Hulk. Just think about it. They both have incredible strength, but they also have different personalities. Mr. Incredible is more family - oriented and used to working in a team with his family. Hulk is more of a lone force, but when they team up, their combined strength could be unstoppable. They could have a great dynamic, like Mr. Incredible trying to calm Hulk down when he gets too angry or Hulk teaching Mr. Incredible some new ways to use his strength in a more brute - force manner.
Some of them might be shocked. Tony Stark, for instance, might immediately start thinking of ways to use technology to change what he saw. Steve Rogers would probably be more concerned about the moral implications of interfering with the future.
They might be confused at first. Fanfiction can be wild and different from their real experiences.
Some Reddit communities dedicated to fanfiction might also be a good source. For example, r/FanFiction or subreddits related to The Incredibles or the Avengers. Members often share and discuss their favorite fanfictions, and you might discover some hidden gems of 'Incredibles Avengers' fanfiction there.
Well, perhaps the Infinity Stones somehow end up in the world of The Incredibles. This attracts the attention of both the Avengers and the Parr family. The two groups initially have some misunderstandings as they try to claim the Stones. But then they realize that a powerful new villain, created by the combined energy of the Stones, is emerging. So, they join forces. Dash's super - speed could be useful for quickly transporting the Stones, while Thor's lightning powers could help in battles against the villain's minions.
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.