Thor would see Ross as a puny and unworthy opponent. He might not even take him seriously at first. But as Ross tries to cause more trouble for the Avengers, Thor could start to really make his presence felt. For example, Thor could show up at Ross's military bases and demand that he stop his unjust actions, with his hammer in hand, ready to intimidate. And the other Avengers would support Thor in these confrontations, making Ross feel completely surrounded and powerless.
Well, in a fanfic like that, the Avengers could constantly thwart Ross's plans. For example, if he tries to enforce some strict superhero registration laws, they could use their powers to outwit him at every turn. They might play pranks on him too, like using Hulk to accidentally 'bump' into his car or something.
The Avengers might be initially cautious around the cast, not fully understanding who they are. The actors, on the other hand, would probably be star - struck. For example, Robert Downey Jr.'s character in real life might try to crack jokes with Iron Man. And Thor might be a bit confused by the concept of actors playing him.
The characters would have a very interesting interaction. For instance, Thor might be intrigued by Aquaman's trident as it has a similar kind of power to his hammer. They could compare their weapons and the magic or technology behind them. Iron Man would probably be fascinated by the technology in Atlantis and might try to adapt some of it for his suits. And Aquaman would have to adjust to the Avengers' more brash and direct approach compared to the more reserved ways in Atlantis. He might initially clash with Hulk due to Hulk's uncontrollable nature, but later find a way to work together, like using Hulk's strength to move large underwater structures.
Ben would probably be in awe of the Avengers at first. He might try to show off his alien forms to impress them. The Avengers, on the other hand, would be cautious. Tony Stark might want to study Ben's Omnitrix. Thor could be interested in the power of Ben's alien forms that are related to strength and lightning.
The characters would likely start off a bit cautious. Ben might be in awe of the Avengers' fame and power. The Avengers would be curious about Ben's alien - changing abilities. They'd probably exchange stories about their battles at first.
The characters would likely start off with some level of mistrust. For instance, the Avengers might be suspicious of Build's powers and his motives at first. However, as they face threats together, they would start to respect each other. Iron Man and Build could bond over their love for technology and inventing new gadgets. Captain America might be initially skeptical but would come to admire Build's courage in battle.
They might start off a bit warily. The Howling Commandos could be skeptical of the Avengers' powers at first. But then they would realize that they can all contribute to a common goal. For instance, Thor's lightning could be used in a way that the Commandos had never seen before, and they could offer their knowledge of stealth and guerrilla warfare to the Avengers.
Well, it really depends on how the fanfic is written. If the Avengers are united and at their full strength, they would likely overpower Ross. They have superhuman abilities, advanced technology, and great teamwork. However, if Ross has some sort of powerful weapon or strategic advantage in the fanfic, he could potentially put up a good fight.
The Avengers could be impressed by the magic of the Harry Potter characters. For instance, Captain America might be in awe of the Patronus charm. And the Harry Potter characters could be amazed by the Avengers' superpowers. Hermione might be very interested in Bruce Banner's scientific knowledge.
The interactions would be diverse. Batman from Young Justice's world might have a serious conversation with Captain America about leadership. They both lead their respective teams. Artemis could befriend Black Widow and learn some new combat skills from her.