Draco Malfoy, if he found out, would likely try to use it to his advantage. He might spread rumors or try to make fun of Harry in Ginny's body. However, some of the more reasonable Slytherins might be secretly intrigued by the situation. They might watch from a distance to see how it all unfolds, while still maintaining their Slytherin coolness. Overall, their friends' reactions would range from confusion and shock to curiosity and, in some cases, an attempt to take advantage of the situation.
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.
Ron would probably be really confused at first. He might think it's some kind of elaborate prank by Fred at first, but when he realizes it's something more serious, he'd be worried. Harry would be more level - headed and try to figure out how to help them switch back. Ginny might find the whole situation quite funny, especially seeing Hermione in Fred's body trying to act like a boy. She might give her some tips on how to fit in better as a male Gryffindor.
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).
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.
Naruto's friends in the Hidden Leaf would be really confused if Harry showed up. They'd wonder why he doesn't know basic ninja stuff. Harry's friends at Hogwarts would be equally baffled by Naruto. Hermione might try to study Naruto like he's a new magical creature. Ron would probably be a bit more hesitant around Naruto at first.
Hermione would probably be super helpful. She'd offer all kinds of advice on everything from pregnancy care in the wizarding world to setting up a nursery with magic. Ron would be a bit more awkward at first, but he'd still be excited. He might joke around a bit to lighten the mood. Neville would be very kind and bring over some of his own home - grown magical plants that could be useful during the pregnancy, like plants that have calming properties or ones that can help with minor ailments.
Pikachu, Ash's main Pokémon, would be very confused. It's used to Ash's mannerisms and commands. When Serena is in Ash's body, Pikachu might not respond as well at first. It might keep looking at 'Ash' quizzically, wondering why he's acting so strange. Serena's Pokémon, like Braixen, might also be confused. They might sense that something is off with 'Serena' (Ash in her body) and be a bit hesitant to follow commands as usual.
Their friends in Gryffindor might be quite shocked at first. Ron, being Harry's best friend, would probably be a bit angry and concerned. He'd lecture Harry about setting a bad example. Hermione would be more worried about the consequences, like if they got caught by the teachers. Neville might be a bit more understanding, having had his own experiences of growing and making mistakes. Luna would probably just smile and say something really off - the - wall like 'Oh, the drunk stars are making you do interesting things.'
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.
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.
Well, in terms of relationships, if Harry and James switch bodies, Harry in James' body would have a new perspective on his father's relationship with Dumbledore. He might question some of the things Dumbledore asked James to do. And James in Harry's body would have to deal with the complex relationship Harry has with the Dursleys. He would probably be much more assertive in dealing with them compared to Harry. Also, the relationship between Harry - in - James' body and the other Marauders would be interesting. He might try to nudge them towards better decisions, changing their relationships in the long run.