Well, in a Harry Potter fanfic, an immortal Naruto could be a mentor figure. He'd bring his own set of values from the Naruto world. His immortality would make him a source of great knowledge, having lived through so many experiences. He could teach the Hogwarts students new ways of combat and self - defense that are different from magic.
In some fanfictions, Harry Potter's immortality might be linked to powerful magic he's acquired. For example, he could have found a way to bind his soul to an indestructible object or mastered a spell that halts the aging process. This immortality often makes him a key figure in the supernatural world of the fanfiction, as he has the time to study and understand magic in ways others can't.
One idea could be that Naruto's immortality is due to some sort of ancient ninja magic that has parallels to the magic in the Harry Potter universe. For example, he could have made a pact with a powerful magical creature in the Naruto world that gives him eternal life, and when he enters the Harry Potter world, he has to figure out how this magic works there. Maybe he tries to find a way to share his immortality with his new friends in Hogwarts, like Harry, Hermione, and Ron. He could also use his ninja skills along with his immortality to protect the wizarding world from new threats that the regular wizards are not equipped to handle.
One common theme is the clash of cultures. Naruto comes from a world of ninjas and Harry Potter from a world of wizards. So, when they are combined, there is often a struggle to understand each other's ways. For example, Naruto might not understand the concept of magic wands at first, and the Hogwarts students might be baffled by his chakra use.
Well, if Naruto was immortal in a Harry Potter fanfiction, it could be really interesting. He could use his ninja skills to deal with the magical threats in the wizarding world. For example, his shadow clone jutsu could be used for various tasks like scouting or distracting dark wizards. His chakra control might also help him in learning magic faster as it's a form of energy control similar to magic in some ways.
Well, there are also fanfictions where mirrors play a role in time - travel or memory retrieval. A character might look into a mirror and be transported back in time to witness an important event from the past, or they could use it to recover lost memories. This gives a whole new dimension to the story and the character's development.
In many Harry Potter fanfictions, goblins are often portrayed as highly intelligent and skilled beings. They are usually depicted as having a great knowledge of magic, especially when it comes to handling precious metals and objects like Gringotts' treasures. They are often shown to be proud of their heritage and magical abilities, and some fanfictions explore their relationship with wizards in more depth, sometimes highlighting the power dynamics and the goblins' sense of independence.
In some Harry Potter fanfiction, cancer might be used as a plot device to add drama. For example, a character could be diagnosed with cancer, which then becomes a source of internal and external conflict. It could show how the wizarding world might deal with a muggle disease, perhaps with magic being used in an attempt to cure it or at least ease the symptoms.
Some fanfictions show empires as having a strict caste system. Pure - blood wizards are at the top, half - bloods in the middle, and Muggle - borns at the bottom. This reflects the underlying themes of prejudice in the original series and how an empire can enforce such ideas on a large scale. This also leads to stories of rebellion and resistance from those who oppose this unjust system.
Loneliness in Harry Potter fanfiction is often a central theme. It can be depicted through the inner thoughts of characters. For instance, Hermione might feel lonely when her friends don't understand her academic pursuits or when she faces prejudice for being a Muggle - born. Writers might show her sitting alone in the library, surrounded by books but still feeling isolated. Another way is by creating new situations where characters are separated from their loved ones and have to face challenges alone, highlighting their sense of loneliness.
Arithmancy can be depicted as a very academic and studious pursuit within fanfiction. Writers may show students spending hours poring over arithmancy textbooks, trying to solve difficult numerical equations related to magic. It could be used as a way to distinguish the more studious characters from the others in Hogwarts.