It should start with a deep understanding of what makes each franchise special. For Harry Potter, it's the magic system, the houses at Hogwarts, and the battle against Voldemort. For One Piece, it's the Grand Line, the Devil Fruits, and the search for the One Piece. In the fanfiction, these elements should be carefully incorporated. Maybe have a story where some of the Hogwarts students are kidnapped and end up in the One Piece world, and the Straw Hat Pirates help them get back home while also learning about magic along the way. This way, both franchises are respected and it creates an exciting new story.
It might be popular among certain groups of fans. There are many aspects in the 'Harry Potter' universe that can be explored in fanfiction, and the relationship between wizards and goblins is an interesting topic. Some fans who are interested in exploring different power dynamics and cultural interactions within the wizarding world may find this fanfiction appealing.
The themes could include respect, of course. Harry showing respect for the goblins might lead to a broader exploration of how different magical beings should respect each other's existence and rights. Also, there could be a theme of redemption, perhaps if the fanfiction involves Harry trying to make up for past wrongs that wizards have done to goblins. And cooperation might be another theme, as Harry could be working with the goblins towards a common goal.
One way could be to start with Harry finding a book about Smaug in the Hogwarts library. He becomes so intrigued that he starts to have dreams about the dragon. Then, as the story progresses, he might use his magic to create a portal to the world where Smaug exists and tries to communicate with him.
Another approach would be to set it in a post - apocalyptic version of the Harry Potter world where the Terminators have already taken over most of the Muggle world. The wizards are the last hope. They would need to combine their knowledge of magic with any remaining Muggle technology they can find. Harry and his friends could train a group of young wizards to be like a wizard - Terminator hybrid fighting force. There would be a lot of scope for character development and exciting battles as they try to reclaim their world from the Terminators.
To write such fanfiction, you could start by creating a crossover point. Maybe a portal opens between the Kryptonian world and the wizarding world. Then, characters from both sides start to interact. A Kryptonian could be amazed by magic and try to learn it, while wizards could be in awe of the Kryptonian's raw power. You'd have to balance the two different power systems and cultures so that the story makes sense.
First, focus on the positive aspects of the original series such as friendship, courage, and magic. For example, you can write about new adventures of Harry and his friends that further explore these themes. Second, keep the language clean and appropriate. Avoid using vulgar words or making inappropriate references. Third, respect the characters' identities and relationships as they are in the original story. Don't create relationships that are against the nature of the characters.
First, make sure to clearly label any content that contains abuse themes so that readers are aware. Then, focus on the character development of the abused character. Show their growth, how they learn from the situation, and become stronger. For example, if a character is being emotionally abused in a relationship, show how they start to recognize the signs and take steps to protect themselves.
Well, one possible plot could be that Doflamingo somehow gets transported to the Harry Potter universe. He might initially try to take over the wizarding world using his devious powers. The female Harry Potter character could be the one to oppose him, using her magic skills and knowledge of the wizarding world. Maybe she teams up with some of Doflamingo's enemies from One Piece who also end up in the same universe.
In a 'Harry Potter x One Piece' summoned fanfiction, it could start with a powerful spell gone wrong in the wizarding world that sends some key Harry Potter characters to the One Piece universe. The Straw Hat pirates would be both amazed and confused by the magic these new arrivals possess. Luffy might be eager to have them join his crew, seeing their unique powers as a great addition to their adventures.
You could incorporate the magic of the Harry Potter world into his treatment. Maybe there are some rare potions or spells that could potentially help, but they come with their own risks and side - effects. For example, a potion that might slow the cancer but also makes him lose his ability to use magic temporarily. This would create a great conflict within the story.