Well, trust is a big theme. Norberta has to trust Harry not to harm her, and Harry has to trust Norberta not to accidentally harm him or others. Growth is also common. Harry might grow in his understanding of magical creatures, and Norberta could grow in her ability to co - exist with humans. And of course, there's the theme of the underdog. Norberta is a young dragon in a world full of powerful wizards, and Harry, despite his fame, is often an outcast in certain situations, so they both have that underdog element.
In many fanfictions, the theme of discovery is prominent. Harry discovers new things about Norberta and her kind, and Norberta discovers new aspects of the human world. Another theme is sacrifice. Harry might be willing to sacrifice his own safety for Norberta, and vice versa. Also, the theme of acceptance is there. The wizarding community has to accept Norberta as more than just a dangerous beast, and Norberta has to accept Harry as a friend, not just a human who feeds her.
Power and its implications is also a frequent theme. X23 has her mutant powers, and in the Harry Potter world, there is magic power. Fanfictions may explore how these different forms of power are perceived, how they can be used for good or bad, and how the characters with these powers are treated by society. For example, X23's powers might be seen as dark magic in the wizarding world at first, and the story could be about how she proves that she is not a threat but an ally.
One common theme is redemption. Since Lily died in the original story, in fanfiction she often gets a chance at redemption, like making up for lost time with Harry. Another theme is the power of love. Their relationship is a strong display of love's power, which can overcome many difficulties.
Time - travel is also a fairly common theme. Fanfic writers often use time - travel to bring Harry and James together in the same time period, leading to all sorts of interesting interactions. It allows for the exploration of their relationship in a new light, like how they would get along as peers rather than father - son. And of course, there's the theme of magic itself. How their combined magic could be used to solve problems or face new threats that the wizarding world might encounter.
One common theme is the clash of different worlds. Since Harry is from the magical world of Hogwarts and Jasper has his own set of characteristics (if from Twilight), their meeting often leads to a theme of cultural or power clashes.
The theme of friendship across different worlds is also quite prevalent. Characters from Inuyasha and Harry Potter form unlikely friendships. They learn from each other, grow together, and overcome challenges that are unique to their combined universes. This theme helps to create heartwarming and engaging stories within the fanfiction genre.
One common theme is the clash of cultures. Harry comes from a world of magic wands and hidden wizarding society, while Starfire is from a more science - fiction - based world with alien technology. Another could be the idea of friendship or romance developing between characters from two very different backgrounds.
One common theme is the clash of different power systems. In Harry Potter, there's magic based on spells and potions, while in Hellsing, there are more physical and dark powers like the strength of vampires. Fanfictions often explore how these power systems interact when the two worlds meet.
Another theme might be power dynamics. The Baroness may have her own form of power, and when combined with Harry Potter's magic, it could lead to stories about how they use their combined powers to overcome challenges. For example, in a story, they might have to battle a powerful wizard who is misusing magic, and they use their unique skillsets to win. This theme of cooperation in the face of danger is quite common in such crossovers.
A common theme is the clash and融合 of different magical systems. Harry's wizardry from the Potterverse and the elven magic in Thranduil's world often collide or combine in interesting ways. Another theme could be the culture shock that Harry experiences in Middle - earth. He's used to the wizarding world in Britain, but the elven society is very different.
One common theme is the exploration of mortality. Given that death is a central part of the concept, fanfictions often look at how the characters in Harry Potter view death, deal with the threat of it, and what it means for their magical existence.