A new superhero created specifically for the fanfiction could be the main character. This character could have a power that is a combination of different Avenger's powers, like being able to have super strength like Hulk and also fly like Iron Man. Their unique abilities would draw the attention of the Avengers, making them the center of a harem - like story.
Peter Parker (Spider - Man) could also be a great main character for this kind of fanfiction. His youthful charm and heroic nature would appeal to characters in both universes. He could be on a school exchange program in Hogwarts (using some multiverse - like excuse) and during his stay, he gets involved with helping the wizards while also catching the eyes of Ginny Weasley, MJ, and Black Widow, creating an interesting harem situation.
Spiderman's sense of responsibility may expand. If he's in a harem with Avengers like Iron Man or Captain America, he might take on more global - scale threats. His character also becomes more adaptable as he has to juggle different personalities and powers within the harem. He might learn new ways to use his own powers from his partners. For instance, if he's with Scarlet Witch, he could learn about different dimensions of power that he hadn't considered before. And he has to be more empathetic to understand the needs and feelings of all his partners in the harem.
I think Spider - Man would make an interesting main character. He's young and has a different perspective compared to the more experienced Avengers. His journey of growing up and becoming a more integral part of the team could be a central theme in the fanfiction. He also has his own set of personal problems like school and his relationships which could add depth to the story.
Captain America might be the main character. He represents the heart and soul of the Avengers in many ways. In this fanfiction, he could be the one leading the team through an emotional crisis, using his unwavering moral compass to guide them and protect the heart of the team and the world they are trying to save.
One common theme is the clash of different worlds. Since it combines Harry Potter's magical world and the Avengers' superhero world, there's always the exploration of how these two very different settings interact. For example, how magic affects high - tech gadgets or how superpowers compare to spells.
One common theme is the outsider - within concept. The OC is usually an outsider who then becomes part of the Avengers' world, and the harem forms around that dynamic. Another theme is the exploration of different powers and how they interact. For example, if the OC has a unique power, how does it mesh with the powers of the Avengers in the context of the relationships.
Iron Man could be the main character. He could use his technological genius to enhance the wings. Maybe he creates a special alloy for the wings that can withstand extreme heat and cold, and also has built - in weapons. He would be constantly tinkering with the wings, trying to make them better, all while using them to fight off new threats.
Obviously, the cook would be one of the main characters. They could be a young and ambitious chef who has always dreamed of working in a place as exciting as the Avengers Tower.
One idea could be that a new character, perhaps a powerful sorcerer, arrives in the Avengers' world. This character has a unique power that attracts the Avengers in different ways, leading to a harem - like situation. For example, Thor might be intrigued by their strength in magic which he respects, while Black Widow could be interested in their stealthy and strategic use of power. Another plot could involve a time - travel accident where an Avenger from the future comes back and ends up in a complex relationship with the current Avengers team, forming a harem.
One popular storyline might involve Spiderman having to balance his relationships with different Avengers while also dealing with his superhero duties. For example, he could be in a relationship with Black Widow, who helps him understand the darker side of the superhero world, and at the same time be friends - with - benefits with Scarlet Witch, who adds a magical and mysterious element to his life. Another could be where he forms a polyamorous relationship with some of the younger Avengers like Shuri and Kate Bishop, and they all work together to take on new threats in the Marvel universe.