The protection of the magical world is also a big theme. Whether it's protecting Hogwarts or the habitats of the Fantastic Beasts, characters from both worlds come together. For example, they might fight against dark wizards who want to use the power of the Fantastic Beasts for evil purposes and also threaten the safety of the wizarding community in Britain.
Friendship is a common theme. Just like in the original series, characters from both universes form bonds to face challenges together. For instance, Harry and Newt might become friends and rely on each other's unique skills.
Another theme is the exploration of magic. Since both series have their own magical elements, in the crossovers, new magical concepts can be explored. Maybe there are new spells that combine the knowledge of Hogwarts and the magic related to Fantastic Beasts.
One idea could be a story where Newt Scamander's magical beasts escape into Hogwarts. The students and teachers have to work together with Newt to recapture them. It would be a chaotic yet fun scenario as the beasts interact with the Hogwarts environment and its inhabitants.
There's also 'When Hogwarts Meets New York'. This fanfic is really cool as it shows how the characters from the Harry Potter series would react to the magical beasts and the different magical environment in New York. For example, Hermione is fascinated by some of the Fantastic Beasts and tries to study them, while Ron is a bit more cautious. It has a lot of humor and interesting interactions.
A common theme is the clash of magic systems. Harry Potter has a more structured and school - based magic, while the Witcher's magic is more wild and often tied to nature. Another theme is the different moral codes. Hogwarts has a relatively clear - cut good - vs - evil, but in the Witcher's world, things are more gray. Also, the idea of different species interacting, like wizards and Witchers, is a common theme.
One common theme is the clash of different power systems. Harry's magic from the wizarding world and the abilities of the Supernatural characters like the Winchesters' demon - hunting skills. Another theme is the exploration of different mythologies. The Harry Potter series has its own set of magical creatures and legends, and Supernatural has a whole range of monsters and religious - based lore. When combined, it makes for an interesting exploration of how these different mythologies interact.
Another theme is the exploration of new powers. For example, in some fanfics, the Bones characters might gain some magical abilities and have to learn how to use them, or vice versa for Harry Potter characters in the Bones - like situations. It's about how they adapt to these new powers and how it changes them. Also, mystery - solving often comes up as a theme. Combining the mystery elements from Bones with the hidden secrets in the Harry Potter world makes for some really engaging stories that keep readers on their toes.
The theme of friendship also often changes. In a crossover fanfic, a female Harry might form different kinds of friendships. For example, in a crossover with the Hunger Games universe, her friendships might be more survival - based compared to the more traditional Hogwarts friendships. And then there's the theme of power. How a female Harry's power is perceived and used in different universes can vary greatly. In some crossovers, she might be seen as a threat, while in others, she's a savior.
One common theme is identity. Since it's a female Harry Potter, there's exploration of how her gender might change her identity within the wizarding world. Another theme is friendship, but perhaps with a different dynamic compared to the original male Harry. For example, how she bonds with Hermione and Ron in a different way.
One common theme is the combination of different powers. For example, when the Fantastic Four cross over with other superhero groups, like the X - Men, you see how the mutant powers interact with the Four's powers. Another theme is facing a greater threat together. In many fanfics, a powerful villain forces the different groups or characters to team up.
One of the themes is the idea of identity. Characters from both universes have to re - evaluate who they are when they are thrust into the other's world. For example, if a werewolf from Anita Blake's world ends up in Hogwarts, they would have to deal with how they are perceived in a world where werewolves are seen very differently. Also, there is often a theme of power struggle. Who has more power? A wizard with a wand or a vampire with centuries of strength? These crossovers often explore that.
One common theme is the fish - out - of - water experience. The female character from another world often has to adjust to the strange new world of Harry Potter, which can be full of magical creatures and spells she's never seen. Another theme is power dynamics. If the female character has different powers or abilities, it creates an interesting balance when interacting with the powerful wizards in the Potter universe.