Steve Rogers would probably be deeply disappointed. He values loyalty highly, and Tony's betrayal would shatter the trust they had. He would try to find out the reasons behind it and might even try to bring Tony back to the right path if he thought there was a chance.
Thor would be angry at first. He is a proud warrior and loyalty is important in his culture. However, he might also be more understanding than others. He has seen many complex situations in his long life and might give Tony a chance to explain himself. He would also be concerned about how this betrayal affects the overall safety of the world.
One possible reason could be that he was forced to betray under some kind of mind control. Maybe an enemy like Hydra got hold of him and made him do things against his will. Another reason might be that he was trying to protect something or someone he loved in a very extreme way that seemed like a betrayal to others. For example, he might have made a deal with a villain to keep Pepper safe.
In some fanfiction, Tony Stark might be angry at the Avengers because of a perceived betrayal. For example, if they made a decision without consulting him that put him or the world in danger. He's a control freak in a way, so when things go awry without his input, he could get mad.
Iron Man would be angry. He'd probably use his technology to try and track Percy down. He might also start to review all the security protocols to make sure no other traitors could do the same. Thor would be more of the 'let's fight him head - on' type, but the other Avengers would have to hold him back until they have a proper strategy.
The Avengers would be in a state of panic and fury. Captain America would likely lead the charge to find Tony. He'd use his military strategy skills to plan a rescue mission. Thor might use his godly powers to track down any signs of Tony's whereabouts. Black Widow and Hawkeye would be on the lookout for any Hydra agents or informants. Hulk could be a wildcard. He might be uncontrollably angry and ready to smash anything in his path to get to Tony.
Tony would probably be extremely hurt. He trusted his team, and betrayal would cut deep. He might initially be in denial, not wanting to believe that his friends could turn on him.
One scenario could be when the Avengers accidentally damage his technology. Tony Stark is very attached to his inventions, and if, for instance, Thor's hammer smashes one of his high - tech gadgets during a battle, he might get angry at the Avengers for not being more careful. His anger would stem from the fact that he spent a lot of time and resources creating those things.
Natasha Romanoff would be disappointed. She values the unity among the Avengers and sees Tony and Steve as important pillars of that unity. She might try to mediate at first, but if the divorce is inevitable, she'd be sad to see the team's dynamic change so drastically.
Well, I really like the fanfiction 'Tony Stark's Ultimate Sacrifice'. It's a heart - wrenching story where Tony has to make a huge sacrifice to save the Avengers and the world. The way it's written really captures the essence of his character. 'Avengers: Tony's Clone Dilemma' is also quite engaging. Here, a clone of Tony is created and the Avengers have to figure out if it's friend or foe. It plays with the idea of identity and loyalty. And 'The Iron Man and the Alien Alliance' is a story where Tony teams up with an alien race to help the Avengers in a fight against a common enemy. It has some really cool alien technology and battle scenes.
Yes, it's possible that Tony Stark, as a character, could be the subject of Avengers fanfiction that he might 'watch' in the sense of being a character within the fictional scenarios written by fans. However, in the official Marvel universe, there's no indication of him actually reading Avengers fanfiction.
Hidden Midgard in a Tony Stark Avengers fanfiction could be a really cool concept. It might be a parallel dimension of Earth that has a connection to Asgard or some other alien realm. Tony Stark, with his curiosity, might be the first to suspect its existence. He could then use his Iron Man suit and all his tech gadgets to find a way to access it. Once there, he might find new allies or enemies, and this discovery could change the course of the Avengers' battles and their overall story.