One great 'pjo avengers crossover fanfiction' is 'The Demigod Avengers'. It has an exciting plot where the demigods from Percy Jackson and the Olympians join forces with the Avengers. The character interactions are really well - written, like when Percy uses his water powers in a fight alongside Thor's lightning.
A unique element is the power combinations. For instance, when Annabeth's strategic mind combines with Captain America's leadership. Another is the cultural clash. The Greek - influenced demigods have a different view of heroism compared to the modern - day Avengers. And the magic in the PJO world interacting with the advanced technology of the Avengers is always interesting.
One idea could be that Percy Jackson finds himself magically transported to Skyrim. He could use his water - bending abilities in the frozen landscapes, perhaps to help deal with frost trolls by using water to freeze their legs or something. Another plot could involve Annabeth Chase coming to Skyrim and using her strategic mind to navigate the political intrigues of the different holds. And maybe a demigod from PJO teams up with a Dragonborn in Skyrim to fight a common enemy like an ancient evil that threatens both their worlds.
One popular HP crossover fanfiction is the one where Harry Potter crosses over with the world of Middle - earth from 'The Lord of the Rings'. In this type of story, you might see Harry and his friends facing the challenges of Sauron along with the magical threats in their own world. Another could be a crossover with the 'Percy Jackson' series, where the demigods and wizards interact in interesting ways. For example, they might have to combine their powers to fight a common enemy that threatens both the wizarding world and the world of the Greek gods.
Another theme is the idea of different cultures coming together. The characters from Sunnydale have a very different upbringing and set of values compared to those in the wizarding world. This can lead to some interesting character dynamics, like Hermione trying to understand Buffy's more street - smart ways or Xander being in awe of the magical grandeur of Hogwarts.
A common theme is the clash of different powers. The magic from Harry Potter and the superpowers of the Avengers often collide and combine in interesting ways.
Imagine a story where the Deathly Hallows are in the Teen Wolf world. The Teen Wolf characters don't understand what they are at first. But then they team up with some HP characters who have come to retrieve them. They have to battle a powerful dark force that wants to use the Hallows for evil in the Teen Wolf realm. This would combine the magical elements of HP with the action - packed werewolf lore of Teen Wolf.
One common theme is the clash of different power systems. In both The Vampire Diaries (TVD) and Harry Potter (HP), there are unique forms of power. In crossovers, it's interesting to see how the magic of HP and the supernatural abilities in TVD interact. For example, how would a vampire react to a Patronus charm? Another theme is the exploration of different cultures. The wizarding culture in HP and the vampire - werewolf - witch culture in TVD are very different, and crossovers often explore how characters from one world adapt to the other.
For the PJO side, Nico di Angelo could be a great character. His control over the dead could have some really strange and interesting interactions in Skyrim, where there are also undead creatures. On the Skyrim side, Ulfric Stormcloak or Elisif the Fair could be included. Elisif's leadership and Ulfric's military might could be factors when dealing with the demigods. If the demigods get involved in the civil war in Skyrim, their powers could completely change the balance of power. And Luke Castellan from PJO could also be an interesting character to bring in, as his complex personality could add a lot of drama to the crossover story.
One interesting HP KHR crossover fanfiction could be where the characters from 'Harry Potter' find themselves in the world of 'Katekyo Hitman Reborn!'. For example, Harry Potter might end up at Namimori Middle School and interact with Tsuna and his friends. They could learn about each other's magic systems, like how the magic in 'Harry Potter' is more traditional with wands and spells, while in 'KHR' it's more about the Dying Will Flame. Another story could involve the Death Eaters somehow getting involved with the Mafia in 'KHR' and causing chaos across both worlds.