The knight may face various challenges and opportunities when he transmigrated to the world of Harry Potter. At Hogwarts School of Witchcraft and Wizardry, he might be treated as an outcast or ostracized, but he could also make like-minded friends here and become a good wizard. He might encounter an evil wizard like Voldemort and need the power of Harry Potter to defeat him. In the process of transmigration, the knight may discover that he has some special abilities such as invisibility, teleportation, etc., which will provide him with more advantages. Vigilante A needs to be constantly on guard against Voldemort's pursuit and strive to protect Harry Potter and the others.
Perhaps it's a new generation of a well - known Harry Potter family. For example, a son or daughter of Harry and Ginny Potter. They could inherit the heroic traits of their parents and become a hero in their own right, only to meet a tragic end in the fanfiction.
Ron Weasley could also be the partially kissed hero. In some fanfictions, Ron might have a moment with a girl where they start to kiss but are interrupted. He's a character who has his own share of romantic interests in the series, and this could be an interesting take on his character in fanfiction.
Harry himself is obviously very popular. Writers often explore different aspects of his character, like his leadership skills or his struggle with the burden of being 'the Chosen One'.
There were many novels about the time travel of the female protagonist to Harry Potter, such as Harry Potter and the Sorcerer's Stone, Harry Potter and the Chamber of Secrets, Harry Potter and the Prisoner of Azkaban, and so on. These novels told the story of the heroine crossing into the world of Harry Potter and becoming Harry Potter's girlfriend or friend to experience various adventures and magical challenges together. These novels were loved by readers with their rich plots and beautiful writing style.
There were many novels about the female protagonist's transmigration to Harry Potter. Some of the more well-known ones were Through Harry Potter: The Mysterious Maid, Through Harry Potter: Secrets of the Wizarding World, Through Harry Potter: Finding the Prisoner of Azkaban, and so on. The protagonists of these novels all had their own unique experience of crossing into the world of Harry Potter and unfolding a series of wonderful adventures in this world.
The magic could enhance the technology. For example, a spell could be used to make Baymax's healing capabilities even stronger. Or the magic could be used to power up the Big Hero 6's gadgets in a way that normal power sources couldn't. Maybe a simple levitation spell could be applied to their flying machines to make them more efficient.
Harry would be very cautious at first. He has been through so much and wouldn't trust just anyone. But if it was to save his friends or the wizarding world, he might consider it. He would probably grill the 'hero' on their motives and abilities. Hermione would approach it analytically. She would want to know all the rules and regulations of the 'Rent a Hero' service and study how it works before getting involved. Ron, on the other hand, might be more easily swayed by the idea of having a 'hero' around, especially if it meant getting out of a tough situation or getting some glory.
Often, heroes from other well - known fantasy worlds are summoned. For example, characters like Aragorn from 'The Lord of the Rings' might be summoned. His skills as a warrior and leader could be very useful in the Harry Potter universe. Another common summoned hero could be Conan the Barbarian. His brute strength and survival instincts would make for an interesting addition to the story. Sometimes, heroes from modern superhero stories are also summoned, like Batman or Superman. Their unique abilities and moral codes would create a lot of interesting scenarios in the wizarding world.
Naofumi from 'Shield Hero' is often quite popular as he brings his own set of skills and experiences into the crossover. Harry Potter himself is also a common focus, as his magical abilities and hero status make him an interesting addition to any story. Hermione is another popular character. Her intelligence and knowledge of magic can be a great asset in the combined world of 'Harry Potter' and 'Shield Hero' fanfiction.
It could be Luna Lovegood. She has a unique perspective on magic. In the final battle fanfiction, she might use her strange but effective magical items and her unorthodox thinking to outwit Voldemort. For example, she could use some of her Lovegood family's special magical artifacts to create a shield or a trap for the Dark Lord.