The most unexpected pair to switch in 'Harry Potter Freaky Friday' fanfiction could be Neville and Bellatrix. Neville, who is kind - hearted and a bit clumsy at times, would suddenly be in the body of the cruel and powerful Bellatrix. Bellatrix, in Neville's body, would have to deal with Neville's insecurities and his new - found courage which would be a huge contrast to her normal self.
For me, it would be Filch and McGonagall. Filch, who is always strict about the rules and rather grumpy, would be in McGonagall's body. He would have to handle the responsibilities of a teacher and a head of house. McGonagall, in Filch's body, would have to experience Filch's lowly position in the school and his obsession with catching rule - breakers.
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.
I think an unexpected pair would be Harley Quinn and Martian Manhunter. Harley's chaotic and unpredictable nature combined with Martian Manhunter's powerful and stoic presence could create some really interesting dynamics. Maybe Harley gets into some trouble on Mars and Martian Manhunter has to deal with her while also uncovering a bigger threat to the planet.
Harley Quinn and Deadpool would be an extremely unexpected pair. Harley's chaotic and unpredictable nature combined with Deadpool's fourth - wall - breaking and equally chaotic personality would make for a really wild and hilarious fanfiction. They could get into all sorts of misadventures while trying to rob a bank or take on a super - villain just for the fun of it.
The Hulk and Neville Longbottom. It seems really odd at first because the Hulk is this big, powerful brute and Neville is often seen as a bit of a clumsy underdog. But Neville has a lot of hidden courage. In a battle, the Hulk's brute strength combined with Neville's new - found confidence and knowledge of magic could be a really unexpected and powerful alliance.
One idea could be Harry and Hermione switching bodies. Hermione would have to deal with Harry's fame and the pressure from Voldemort while Harry would experience Hermione's academic stress and her friendships in a new way. Another plot could be Ron and Draco switching. Ron would be in the Slytherin environment and Draco in the Gryffindor one, which would lead to a lot of confusion and self - discovery for both of them.
Naruto and Sasuke are very commonly swapped. Their personalities are so different that it creates a lot of interesting scenarios. Naruto's optimism in Sasuke's body would be a huge contrast to Sasuke's usual brooding self. And Sasuke in Naruto's body would have to deal with Naruto's naivete and also his strong bonds with the other villagers.
Snape and Madarao would be an unexpected but fascinating pairing. Snape's brooding and complex personality could interact in an interesting way with Madarao's more straightforward and loyal nature. Snape could perhaps study the unique yokai magic associated with Madarao, and Madarao could be both amused and intrigued by Snape's potions and spells.
I think Darkseid would be the most unexpected. Imagine Harry Potter being raised in Apokolips. He would have to adapt his magic to survive in such a harsh and evil - dominated place. His magic could potentially be a threat to Darkseid's rule, or he could learn some dark magic - like powers from Darkseid's regime, which would completely change his character and the way he uses magic.
I think Squidward from Nicktoons and Courage the Cowardly Dog from Cartoon Network would be quite unexpected. Squidward is always so grumpy and pessimistic, while Courage is, well, cowardly but also very kind - hearted. Their interactions would be really strange and comical.
I think Mineta and Momo would be a really unexpected pair. Just imagine Mineta in Momo's body having to act in a more ladylike and intelligent way, which would be a huge contrast to his normal perverted self. And Momo in Mineta's body would have to deal with his short stature and his rather... unique personality traits. It would be quite the comical and challenging situation.