In Harry Potter, a character can be themselves by following their own moral compass rather than the strict rules of Hogwarts. For example, if they believe that house unity is more important than competition, they can act on that. In KHR, a character can be true to themselves by using their skills in a way that aligns with their personal beliefs. If they think violence is not the answer, they can use their fighting abilities to protect rather than attack.
Authors need to first understand the core elements of both universes. For Harry Potter, it's the magic, Hogwarts, and the fight against Voldemort. In KHR, it's the Mafia families and the growth of Tsuna. Then, they can start by introducing characters from one universe into the other in a believable way. For instance, if Harry were to enter the KHR world, how would he adapt to the different rules and powers there?
Another option is FanFiction.net. Although the search there might not be as refined as on AO3, you can still find some good 'khr crossover harry potter fanfiction' by using specific keywords in the search. Also, check out some of the fanfiction communities on social media platforms like Tumblr or Reddit. People often share links to their favorite stories there.
One possible reason could be self - punishment. For example, if a character made a big mistake, like accidentally harming a friend with magic, they might starve themselves as a form of penance. They could be feeling so guilty that they believe they don't deserve to eat.
Socially, they might start to withdraw from their friends. If a character like Neville was starving himself, he might not want to go to the Great Hall for meals and thus miss out on social interactions with his friends. This could lead to misunderstandings and a further decline in his mental state as he becomes more isolated.
You can start by looking on popular fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and you can easily search for Harry Potter KHR crossovers using the search bar. Just type in relevant keywords like 'Harry Potter KHR' and browse through the results.
Harry and Tsuna would be a great pairing. Harry has the weight of saving the wizarding world on his shoulders, and Tsuna is constantly growing into his role as the Vongola Decimo. They could learn from each other's experiences of facing great challenges and finding their inner strength.
I've heard of 'Potter and the Hitman's Adventure'. In this fanfic, the author takes elements from both series and creates a new plot. For example, Harry could end up learning some of Reborn's combat techniques while still using his wizardry. It's a really fresh take on cross - over fanfictions.
One great 'dusk to dawn' Khr Harry Potter fanfiction could be 'The Enchanted Dusk' where Khr goes on an adventure through Hogwarts at dusk and discovers a hidden magic that lasts until dawn. It has a really interesting plot that weaves in elements from both the world of Harry Potter and the unique character of Khr.
They might be shocked at first. I mean, seeing their own stories being written in a different way by fans would be quite unexpected. Sirius might find it really cool and be eager to read more, while James could be a bit more critical, thinking about how accurate the portrayal is. Remus would probably be more laid - back and just enjoy the different interpretations.
There's also 'A Crossover of Worlds'. This fanfiction focuses on the clash of cultures between the two universes. It has interesting plot twists where the Death Eaters get involved with the Vongola famiglia. It's full of action and the author does a great job of making the two different magic systems work together.