Harry's friends would be extremely confused at first. Hermione might suspect something is wrong right away and start investigating. Ron, on the other hand, might be more straightforward and just think Harry has gone a bit strange. The Gryffindors might be suspicious of 'Harry' (really Draco) acting differently. For Draco's friends, they would also notice the change. Crabbe and Goyle might not be smart enough to figure it out immediately, but Pansy might sense that something is off with 'Draco' (really Harry).
I really like 'The Unexpected Swap'. In this fanfiction, when Draco and Hermione switch bodies, it leads to some interesting interactions with their friends. For example, Harry and Ron are completely bewildered by 'Hermione' (who is actually Draco) acting so out of character. Also, the author does a great job of showing how Draco starts to see Hermione's world in a new light while in her body, and vice versa. It's a really engaging read.
I think Iron Man and Hulk would be a really interesting pair. Just imagine Tony Stark's brilliant mind trapped in the Hulk's huge, rage - filled body. He would be constantly trying to find a way to control the Hulk's strength and not go on a rampage. And Hulk in Tony's body would be so confused by all the technology and might accidentally set off some of Stark's weapons.
There would be some humorous moments too. Harry might not be used to wearing Ginny's clothes and would fumble with the different styles. Ginny, in Harry's body, might accidentally use his more masculine way of speaking and shock her friends. Also, if they had to participate in Quidditch in each other's bodies, it would be quite a sight. Harry, in Ginny's body, would have to adjust to her style of playing, and Ginny, in Harry's body, would have to live up to his reputation on the broom.
Well, it's really interesting. When Draco and Hermione switch bodies, it's not just about the physical change. Their relationship is affected on multiple levels. Emotionally, they start to empathize with each other. Intellectually, they learn from the way the other approaches problems. Socially, they see how the other is treated in their respective social circles. All these factors combined lead to a significant shift in their relationship. For instance, in some stories, this experience makes them realize that their previous animosity was based on misunderstandings, and they begin to work towards a more positive relationship.
Their other friends in Gryffindor would be quite shocked. Neville, for instance, might stutter and not know how to react. Luna might have a more calm and accepting reaction. She might say something like 'This is a very interesting turn of events. I wonder what the magical cause could be?' The Weasley family would be especially confused. Molly Weasley might be worried about Ginny's well - being and Arthur Weasley would be trying to figure out how such a strange magical occurrence could have taken place.
Well, perhaps a plot where in their switched bodies, they are forced to face their worst fears. For Harry in Severus' body, it could be dealing with the Dark Mark and the memories of his past actions as a Death Eater. Severus in Harry's body might have to face Voldemort directly, as Harry is often the target, and this could lead to some really intense and unexpected magical battles and revelations.
One interesting plot development could be the confusion it causes among their friends. Harry, in Hermione's body, might struggle with her academic routines and the way she approaches studies. Meanwhile, Hermione in Harry's body has to deal with the pressure of being the 'Chosen One' and facing Voldemort. For example, when Harry tries to answer questions in class as Hermione, he might not be as quick or accurate, leading to some humorous moments. Also, Hermione in Harry's body could use her intelligence to come up with new strategies against the Dark Lord that Harry might not have thought of before.
In a body - switch scenario, Harry in Hermione's body would probably have his personality shift towards being more detail - oriented. He'd pay closer attention to the little things, like Hermione does when she's studying spells or researching. He might also become more critical of himself in terms of academic performance. Hermione in Harry's body, though, would gain a bit of Harry's recklessness. She'd be more willing to take risks without fully thinking through the consequences. But at the same time, she'd still retain her intelligence, so she might use it to calculate risks better than Harry usually does. This switch of personalities could lead to some really interesting character interactions and growth throughout the fanfiction.
One idea could be that Harry, in James' body, has to deal with the Marauders' era challenges like handling Snape's enmity in a different way. He could use his knowledge of the future to prevent some of the bad blood between them. Another plot could be James, in Harry's body, trying to figure out modern Hogwarts and the new threats like Voldemort's return. He might be shocked by how much the wizarding world has changed yet still use his old - fashioned courage to face the new problems.