Thor would be more direct. He'd probably try to use his Asgardian knowledge and magic to see if there's a way to cure Tony's insanity. He might also be a bit brash in his approach, which could either help or make things worse depending on Tony's state. For example, he could try to shock Tony back to normal with his lightning, thinking it might reset his mind.
Captain America would likely try to be the voice of reason. He'd approach Tony with empathy, trying to understand what's going on in his head and find a way to bring him back to his senses. He might also try to keep the other Avengers calm and focused on helping Tony rather than seeing him as a threat immediately.
Black Widow, being the master of espionage and psychology, would dig deep into Tony's past and the events leading up to his insanity. She'd try to find any hidden motives or external influences. She might also keep an eye on the other Avengers, making sure they don't do anything rash that could endanger Tony or themselves while they're dealing with his changed mental state.
One possible cause could be the extreme stress he endures. Constant battles, the fear of failing to protect the world, and the loss of friends can all take a toll on his mental state. In fanfiction, writers might explore how the weight of these experiences gradually pushes him over the edge.
They could get emotional. Iron Man has been through a lot, and a fanfic might explore his emotional journey in more depth. The Avengers, who have fought alongside him, would likely be affected by this. They might remember the times they shared with him, the battles they fought together, and this could strengthen their bond as a team, even if it's just based on the fanfic's version of his story.
Some of them might be in awe of his technological achievements. Others could be moved by his moments of self - sacrifice.
They could be shocked. Some of the scenarios in fanfiction can be extreme. For instance, if it has Iron Man suddenly turning evil, it would be a big surprise to them.
The Avengers would likely be filled with rage. Captain America, for instance, would immediately charge at Thanos, not caring about the danger. His sense of justice and loyalty to his friend would drive him to seek revenge right away.
Some of them might be really into it. Like Spider - Man (if he's considered part of the Avengers for this), he's a big fan of Iron Man in the first place, so he'd probably enjoy the fanfiction. He might even get some new ideas for his own tech - related projects from it. Dr. Strange, on the other hand, might be a bit dismissive at first. He's used to dealing with real magic and might not see the point in fictional stories about Iron Man, but then he might start to appreciate the creativity.
There are indeed. In some fanfics, the Avengers' reactions can be quite humorous. They might make jokes about Tony's self - destructing suits or his attempts at flirting. Other fanfics might take a more serious approach and look at how the events of 'Iron Man 3' affect the Avengers' relationships with Tony and each other, like how it could create trust issues or bring them closer together.
Spider - Man would probably be shocked at first. He looks up to the Avengers and being kidnapped by them would be the last thing he expects. He'd likely try to talk his way out, using his quick wit and charm. He might start by asking why they're doing this and try to convince them that they've made a mistake.
Spider - Man would be very confused. He would feel betrayed because he thought the Avengers were heroes he could trust. He could start by asking them why they are doing this. If they don't give him a satisfactory answer, he might try to escape in a sneaky way, using his spider - like abilities to find a weakness in their capture setup while still trying to reason with them.
Spider - Man would probably be defensive at first. He's used to working alone most of the time, and being interrogated by the Avengers would seem unfair to him. He might crack some jokes to ease the tension, but also firmly state that he's a hero too.