Definitely Dr. Strange. He already has a connection to magic, so in a Harry Potter x Avengers fanfic, he could bridge the gap between the two worlds. He could learn new spells from the wizards and share his knowledge of the mystic arts. His ability to manipulate time and space would be really useful in the wizarding world, and he could help the Avengers and the wizards deal with threats that involve both magic and science.
Harry Potter himself would be a very interesting character. He has a strong sense of justice and is used to dealing with dark magic. In a crossover with the Avengers, he could learn from their different fighting styles and leadership. He could also show the Avengers the importance of friendship and loyalty in the face of danger. His magical abilities combined with the Avengers' superpowers would make for a very powerful and interesting combination.
I think Harry Potter and Captain America would make a great pairing. Harry has a strong sense of justice and leadership within the wizarding world, and Captain America has similar qualities in the superhero world. They could exchange ideas about leading their respective teams and learn from each other's experiences in fighting evil.
Definitely Harry Potter and Iron Man. Harry has his quick thinking and strong moral compass from growing up in the wizarding world, and Iron Man has his technological genius and sarcastic charm. They could bounce ideas off each other, with Harry explaining the intricacies of magic and Tony trying to find a scientific explanation for it. Maybe Tony could even create some gadgets to work with magic, like a device that can detect hidden magical objects.
One really interesting pairing could be Captain America and Harry Potter. Captain America represents honor and self - sacrifice, which are values that Harry also holds dear. They could lead their respective teams in a joint battle against a common enemy. Also, Black Widow and Ginny Weasley would be an unexpected but fascinating pair. Black Widow's skills in combat and espionage could be combined with Ginny's fierce determination and her own combat skills learned from the D.A. Ginny could also teach Black Widow some magic tricks to use in their battles.
Definitely Harry Potter and Spider - Man. Harry could teach Peter about the magical world, like how to use a broomstick. And Peter could show Harry how to use his web - slingers in a more creative way in combat. They're both young heroes with a strong sense of justice, so they'd get along well.
I think an interaction between Iron Man and Hermione would be really interesting. Iron Man is a genius with technology, and Hermione is a brilliant witch with a thirst for knowledge. They could exchange ideas about how magic and technology could be combined. Maybe Iron Man would be impressed by Hermione's quick thinking and ability to solve complex problems with just her wits and a wave of her wand.
Another great pairing would be Hermione and Bruce Banner. Hermione is extremely intelligent and book - smart, and Bruce Banner is a brilliant scientist. They could collaborate on studying the differences and similarities between magic and science. Hermione could help Bruce understand the complex theories behind magic, and Bruce could explain to Hermione some of the advanced scientific concepts he's been working on. Also, when Bruce turns into the Hulk, Hermione could use her magic to try and control or at least direct the Hulk's power in a more useful way.
Definitely Harry Potter and Spider - Man. Harry has this whole burden of being the Chosen One and having to deal with the wizarding world's problems. Spider - Man, on the other hand, is a young hero trying to balance his normal life with his superhero duties. They could bond over their shared experiences of being young and having a lot of responsibility thrust upon them.
Draco Malfoy and Grell Sutcliff could be a rather unexpected and fascinating pairing. Draco's pride and aristocratic upbringing in the wizarding world would contrast with Grell's flamboyant and somewhat unhinged personality in the Black Butler world. Their interactions could lead to some really comical and also thought - provoking moments in the fanfic.
Harry and Naruto would be an obvious and interesting pairing. They both have a strong sense of justice and have faced great hardships in their lives. Harry has to deal with the threat of Voldemort, while Naruto has to overcome the prejudice against him as a jinchuriki. They could share their experiences and learn from each other's determination.
Definitely Percy and Tony Stark. Percy is this young, powerful demigod from a world of magic and myth, while Tony is a genius billionaire with high - tech gadgets. Their interactions would be filled with banter. Tony would be constantly trying to figure out how Percy's powers work and Percy would be both amazed and a little put off by Tony's arrogance at times.