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.
It might also be a character from a marginalized group in the wizarding world, like a werewolf or a house - elf who overcomes great odds and prejudice to become a hero. Their death could then be used to highlight the continued inequalities and challenges in the fan - created Harry Potter universe.
One possible plot could be that a beloved hero character, perhaps someone inspired by the original Harry Potter series, sacrifices themselves to save the wizarding world from a new and powerful dark force. This selfless act would be in line with the themes of heroism in the original series.
First, Harry would need to prove himself. As the Master of Death, he has a certain aura about him. In Asgard, he could start by saving a village from a monster attack. His ability to speak with snakes (if he still has that Parseltongue ability) might come in handy when dealing with some of the more mysterious creatures in Asgard. He could also use his experience from the wizarding world's wars to strategize against Asgard's enemies. As he gains more and more respect, he becomes a hero, and the Asgardians might start to see him as a protector, like they do with Thor.
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.
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'.
Well, in fanfiction, Harry Potter can be a hero due to his loyalty to his friends. He will always stand by them, no matter how dangerous the situation is. His self - sacrifice also plays a big part. He's willing to put himself in harm's way to protect others, and that's very heroic. Moreover, his ability to adapt to new and difficult situations quickly makes him a hero figure in many fan - created stories.
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.
It could be Aladdin. Since Jasmine is his love interest, he would be motivated to rescue her from Jafar's hypnosis. He has his wits and the help of Genie, so he could find a way to break the spell and save Jasmine.
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.